Where to Put The Thermometer In the Grow Tent? Best 5 Hygrometers

(Last Updated On: September 2, 2021)

Ever since growers have come to know all the improvements temperature readings can make to the grow tents, all sorts of details about the thermometer have become their constant concern.

Among all the queries, “where to put thermometer in grow tent?” is the one that confuses the newbie growers and sometimes even the most experienced growers.

Here we have gathered all the needed information about why and where to put the thermometer in the grow tent.

Also, to save your time and effort, we have reviewed 5 best thermometer and hygrometers for grow tents.

Why should you use a thermometer in a Grow Tent?

Indoor plants require a different range of temperature in different phases. Ignoring the accurate temperature in each stage can heavily upset the plants. It leads them to grow weakly with a lower yield.

Also, the required temperature for a grow tent can vary from plant to plant. Some greeneries grow well under high temperatures, and some constantly need average or low temperatures.

Keeping all these facts in mind, you can only supervise the temperature of your grow area with the help of a thermometer. If you know the needed temperature and adjust the present condition, then your plants have the best chance to thrive and flourish.

Where to put the thermometer in grow tent?

Different growers have different opinions on where to put the thermometer in the grow tent. Since monitoring the temperature and humidity correctly is utterly essential, we have discussed only the most effective placements of thermometers to determine the accurate temperature.

On plant level

In most cases, you would want to know the highest temperature of the tent your plants are growing in and if it is causing any harm.

Several experiments imply that the temperature of a grow tent is higher on the upper compared to the ground.

Thus, by placing the thermometer on the plant level (middle of the tent), you can get a combined reading of the upper and lower sides. It will most likely give you the average temperature of the whole room with the most accuracy.

On root level

Some growers are more worried about the temperature on the root level. As they believe that: if the root is at the right temperature, the plants will not be affected much by the overall atmosphere.

So, they tend to place a thermometer on the ground or align with the pot to detect the temperature at the roots.

On the filter or fan

If your grow tent has enough air circulation, you can put the thermometer over the fan or filter. So it will be easier to see the readings without any obstruction.

Outside the tent

Growers who have bigger grow tents, or numerous plants need to be extra careful with the temperature.

This is why we highly recommend using more than one thermometer, including one outside of the tent.

N/B: To avoid miscalculation due to light temperature, never place the thermometer anywhere directly to the grow light.

Where to put the hygrometer in a grow tent?

Knowing the humidity of the grow tent and adjusting a comfort level is equally crucial for the plants. Therefore, a hygrometer does the job for you.

Luckily, you can find a lot of devices that give you both the temperature and humidity reading. Getting one of those can reduce your tension for 2-different devices for two purposes.

Hygrometers do not have any particular requirement of placement to get an accurate result. Whichever place is suitable for the thermometer is also okay for the hygrometers.

N/B: The only thing to be careful about is not to place it directly to the windows or fans to avoid the influence caused by the outside temperature and humidity.

What is the best temperature and humidity for a grow tent?

Before adjusting the temperature and humidity, you must know the best temperature and humidity for different plants and several growing stage requirements.

For seedlingsthe flavor and yield depend very much on the temperature and humidity at the seedlings period. The ideal temperature range for this phase is 18-22 degrees Celsius, and humidity should be between 30 to 40 percent.

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During vegetationat the veg stage, plants require a warm atmosphere in the daytime and a cooler environment at night or dark periods.

So the suggested temperature range is 20 to 28 degrees Celsius, and humidity should be 50 to 60 percent around the day but mostly at night.

During floweringin this stage, the temperature between 15 to 25 degrees Celsius is primarily preferable, and for better harvesting, you can lower or higher the temperature, if needed.

Similarly, the humidity level should be 35 to 45 percent at least. Also, you might need to lower the humidity and stay at 30% for the last few weeks before harvest.

Best 5 Thermometer for Grow Tent

After analyzing all the most-used temperature and humidity monitors, we have listed these 5 Best Thermometer & Hygrometer for Grow Tent. All the products here are best at their jobs and ensure proper temperature and humidity reading with a few other advantages.

1. ThermoPro TP50 Digital Thermometer & Hygrometer

ThermoPro the best hygrometer for grow tent

Highlighted Features

  • Material: Plastic
  • Humidity level indication
  • Accuracy: ±2~3%RH and ±1°F
  • Refreshes every 10 seconds
  • 2 mounting options

The battery-powered ThermoPro TP50 is the best hygrometer for grow tent.  You could buy it to determine the temperature and humidity of a particular place.

This hygrometer provides an accurate reading in its 2.7″ display. Besides, to explain the present condition to the users, it uses face icon indications. The display shows ‘dry’ while humidity<30%, ‘comfortable’ while humidity is 30%-60% RH, and ‘wet’ while humidity>60%.

ThermoPro TP50 refreshes the reading every 10 seconds; thus, the determined temperature and humidity level can keep a constant pace as time goes by.

 Also, the temperature-humidity gauge stores the records of the highest and lowest reading this device reaches each time. However, you can clear all the data by holding the switch behind for 2 seconds, whenever you want.

To keep it in a position to work correctly, you can either place it on a plain surface with its tabletop stand or use the magnetic back by attaching it with any metal surface.

Along with all the benefits, ThermoPro TP50 has a modern, sleek design. So, in terms of services and outlook, you can easily pick this device as one of the best temperature and humidity monitors.


  • Easier readability
  • Lightweight
  • Portable
  • Smart outlook
  • Durable battery


  • Some people may find the size too small

2. AcuRite Digital Hygrometer & Indoor Thermometer

AcuRite Digital Hygrometer & Indoor Thermometer

Highlighted Features:

  • Material: Plastic
  • Shows daily temperature range
  • 4 mounting options
  • Switch between Celsius & Fahrenheit
  • Simple interface

AcuRite 00613 is a lightweight hygrometer that shows you the overall temperature of any specific place with one click. The simple interface allows you to monitor the humidity level at a glance by displaying short notes as High, Low, and Okay.

In addition, it includes the high and low temperatures of the past 24-36 hours so that if anything seems inappropriate, you can take fast action to recover the environment in that particular place.

AcuRite 00613 lets you switch the temperature between Celsius and Fahrenheit. So you can work with whichever unit you feel more comfortable in. The range is 32 °F to 122 °F for Fahrenheit and 0 °C to 50 °C for Celsius units.

It has 4 placement options. Because of the compact size and bold numbers, it is easy to move this device in different places while watching the reading effortlessly. Place it on any flat surface by the kickstand, attach the magnet with metal, or you can even hang it with the keyhole.

AcuRite 00613 has a considerable humidity range of 16% to 98%. So, it can pair up with humidifiers and combinedly improve the condition of an indoor environment.


  • Pairs with humidifiers
  • Helps to predict the temperature
  • Easy to understand
  • Wireless
  • Durable


  • No backlight

3. Govee Temperature Humidity Monitor

Govee Temperature Humidity Monitor

Highlighted Features:

  • Material: Plastic & LCD
  • Provides app monitoring system
  • Notification alert
  • Updates every 2 seconds
  • Accuracy: ±0.54°F; ±3%RH
  • Multiple sizes available

The Govee Temperature Humidity Monitor is the most ingenious device we have in this category that fairly suits the 21st century. The ‘Govee Home App’ is the reason which makes it different from the traditional machines.

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Think, what could be better than finding out the temp of your grow tent without actually going there 10 times a day! Well, it’s possible by connecting the Bluetooth of your phone with the device (works within 230ft). And with the app, you can monitor the whole situation, like a smartwatch. 

After setting up the device, you can even store all records of several years and export a CSV file that can store up to 2 years of data. Not only that, the device itself will keep the records of 20 days and share the information as soon as you connect the Bluetooth.

Govee ensures a clear view of the reading with an LCD display and bold letters, which help the user monitor the temperature from any corner or angle.

Also, it shows the minimum and maximum temperature of the last 24 hours to help you to get a  better grasp on the overall atmosphere. Plus, you can change the unit between Celsius and Fahrenheit by only switching the button at the top.

It refreshes the records every 2 seconds, which implies a high accuracy level. Additionally, the notification system lets you recover the temperature and humidity by alerting you immediately whenever the situation goes beyond your presets.

Besides, the compact size of this design and multiple mounting systems allow you to place this device on various surfaces.


  • Syncs with phone
  • Stores data
  • Fast updates
  • No WiFi connection needed
  • Excellent display


  • No remote monitoring
  • No backlight

4. VIVOSUN Hygrometer and Thermometer for Indoor Outdoor

VIVOSUN Hygrometer and Thermometer for Indoor Outdoor

Highlighted Features:

  • Provides both indoor & outdoor data
  • Accuracy: ± 1.5°F/± 1°C; ±5%RH
  • Over 3 wireless channels
  • Blue backlight
  • Touchscreen
  • Multiple placement options

The VIVOSUN Hygrometer and Thermometer is a powerful device as it manages to provide the temperature of both indoor and outdoor conditions. Updating data every 10 seconds adds more reliability towards the high accuracy level.

The major attraction of this hygrometer could be the blue backlight. With the touchscreen display, you can turn on the backlight effortlessly.

However, the light automatically goes off after 12 seconds so you have to monitor the readings quickly within this time whether from a long or short distance. Even if it is an overly bright or dark room you can monitor the situation pretty easily. How convenient!

At times, you can run the device with the included remote. The range for usage is 60m/200FT. With the substantial frequency of 433 MHZ, there is hardly any chance of missing the signal while working.

It also has a few mountain options, enough to fit inside a grow space, such as a tabletop stand, magnet backing, and wall hanging.

While a few hygrometers have underperformed as a thermometer, VIVOSUN is quite the opposite. It shows the accurate reading of a thermometer and can easily be called one of the best thermometers for grow tent.


  • Smooth display & touchscreen
  • Saves battery life
  • Fast refresh of  data
  • Can be easily operate
  • Medium-sized


  • Remote does not work out of the range

5. ThermoPro Digital Indoor Thermometer & Hygrometer

ThermoPro Digital Indoor Thermometer & Hygrometer

Highlighted Features:

  • Easy temp level indication with icon
  •  Accuracy: ±1 F/C and ±2%-3%RH
  • Refreshes every 10 seconds
  • Easy to read
  • 3 mounting options

ThermoPro TP49 is another ThermpPro product that has a simple interface and is user-friendly. This hygrometer accomplishes only the basic tasks, and sometimes that is all you want.

The humidity level is easy to understand with the face icon indications. It updates existing data every 10 seconds to avoid showing any faulty reading.

It has a relatively long battery life of more or less 18 months. The compact design and durability are perfect for anyone purchasing their first-ever hygrometer to get familiar with the numbers, unit, and indoor temperature.

Also, this ordinary device provides the options to choose between the units. So, that you don’t have a tough time understanding the numbers, whether it is Celsius or Fahrenheit.

This model has 3 different placing options. On a tabletop stand, by hanging on a hook and magnet attaching; you have the freedom to keep it on any level of height or on a plain surface or connect horizontally.

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  • Easy to operate
  • Affordable
  • Beginner-friendly
  • Long battery life
  • Simple interface
  • Lightweight


  • No advance level options

How To Choose The Best Thermometer For Grow Tent: Buying Guide

The novice growers often find it hard to select the perfect thermometer for their grow tents. A defective or inappropriate thermometer can heavily damage the plants and make you feel guilty for the loss.

Here are a few factors you should keep in mind before purchasing a thermometer-

Accuracy level

If you have thought of buying a thermometer; monitoring the temperature correctly must be your priority. In that case, compare the accuracy level of the thermometers you have in your queue and undoubtedly go for the one with the highest level of accuracy.


You can find various sizes of thermometers but stick with the one you feel comfortable with. If a compact size that easily fits anywhere, including the limited-sized plant pots, then ThermoPro TP50 Digital Hygrometer is the perfect one.

Also, if you want to monitor the readings from a distance, many bigger sizes are available too. For instance, VIVOSUN Digital Hygrometer for Indoor Outdoor has a convenient size to set the seal on your purpose.


Since most of the devices in this category run by battery, you need to find out which thermometer offers the best battery life.

Changing the battery every now and then is hazardous and causes an unexpected cost at the end of the day. That is why check twice the battery life and confirm with the seller before purchasing it.

Placement options

If you are thinking of using the thermometer inside a grow tent, you must see if your desired thermometer has the appropriate mounting option for where you want to place it.

Most of the devices have several mounting options. Still, make sure your thermometer has a kickstand, magnet backside, and hook to hang on the tent wall, at least. It will help you move them into different locations and heights to determine the appropriate readings.

Additional benefits

All the thermometer accomplishes the primary task of finding out the temperature. The new technologies are offering more than that in some thermometers.

Modern devices allow you to connect the monitor with an app on your cell phone so that you don’t have to go check your device display in the grow tent every few seconds.

Also, the alerting notification system, blue backlight are some of the advantages that will attract you if you are a tech-savvy grower.

Frequently Asked Questions (FAQ)

1. What is the best temperature for a grow tent?

Ans.  Staying between 21°C to 25°C is the best temperature for a grow tent. However, the number differs from plant to plant and each growth stage.

2. Is 82 degrees too hot for Grow Tent?

Ans. not really. Having 82 degrees Celsius temperature in your grow is not appropriate at all. 82 degrees Fahrenheit is fine though

Because high temperatures can slow down the growth and yield of the plants. Expert growers recommend not to raise the temperature over 60%. And also, the humidity should be slightly higher in your grow tent at night or dark phase.

3. How hot is too hot in a grow tent?

Ans. Most of the grow tents can adjust with 90°-100°F temperature or even more at times. But as you shouldn’t go over 65-70°F, you must lower the temperature somehow and keep it around the ideal range.


A thermometer that provides accurate reading can severely improve the plant’s condition in a grow tent. Similarly, a defective device can also ruin all your efforts and make them go in vain by giving faulty results. And not placing it in the right place can cost you to.

So you need to have the perfect knowledge of where to put thermometer in grow tent. Therefore, though the task of picking a thermometer seems an easy chore, still give a proper thought before buying the suitable one and place it in the right location to see the accurate readings.

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