Best Tarantula Thermometers (2026)
Most tarantulas kept in captivity thrive at room temperature and don't require supplemental heating — but that doesn't mean temperature monitoring is unimportant. The vast majority of pet tarantulas are comfortable at normal indoor room temperatures, making thermometers more important than heaters. A reliable thermometer lets you verify actual enclosure conditions and catch problems before they affect your tarantula's health, feeding response, or molting cycle.
Do Tarantulas Need a Thermometer?
Most commonly kept tarantulas do well between 68–80°F — a range that covers most homes year-round. However, temperatures outside this range — particularly sustained heat above 85°F — can be dangerous. A thermometer lets you verify actual enclosure temperature rather than guessing from ambient room temperature, which can differ significantly depending on enclosure placement, lighting, and seasonal changes.
What to Look for in a Tarantula Thermometer
- Accuracy: Look for thermometers accurate to within ±1°F. Cheap dial thermometers are often inaccurate by several degrees.
- Digital readout: Digital thermometers are more accurate and easier to read than analog dial types.
- Combo units: Thermometer-hygrometer combos give you both temperature and humidity in one device — useful for tropical species that need higher humidity.
- Probe vs. infrared: Probe thermometers measure air temperature inside the enclosure. Infrared (non-contact) thermometers measure surface temperature instantly — useful for spot-checking substrate temperature.
Temperature Guide by Species Type
| Species Type | Ideal Temperature Range |
|---|---|
| Arid/semi-arid terrestrial (Mexican Red Knee, Arizona Blonde, GBB) | 70–80°F |
| Tropical arboreal (Pink Toe) | 72–80°F |
| Old World species (Cobalt Blue, OBT) | 72–80°F |
72–80°F is appropriate for most Old World species. Short periods above this are tolerated but shouldn't be the target — avoid pushing temperatures toward the upper end as a baseline.
Top Tarantula Thermometer Picks
Best Overall: Digital Thermometer-Hygrometer Combo
A digital combo unit gives you both temperature and humidity readings in one device. Ideal for tropical species where humidity matters as much as temperature. Many models include a remote probe so you can monitor inside the enclosure without opening it.
Best for Quick Spot Checks: Infrared Thermometer Gun
An infrared thermometer lets you check substrate surface temperature instantly without disturbing the enclosure. Useful for verifying that a heat source isn't creating hot spots, or for checking temperature across multiple enclosures quickly.
Browse infrared thermometers on Amazon
Best Budget Option: Exo Terra Thermometer
A simple, affordable digital thermometer with a probe. Accurate enough for most tarantula setups and widely available. A good starting point if you only need temperature monitoring without humidity.
Do Most Tarantulas Need Supplemental Heating?
No — most commonly kept tarantulas do not require supplemental heating if kept at normal room temperature. If your home drops below 65°F regularly, warming the room is preferable to heating the enclosure directly. If a heat mat must be used, mount it on the side of the enclosure — never underneath — and monitor temperatures carefully to avoid creating dangerous hot spots.
What to Avoid
- Cheap analog dial thermometers — often inaccurate by several degrees
- Heat mats placed under the enclosure for burrowing species — can trap the tarantula against heat in its burrow
- Relying on room temperature alone without verifying inside the enclosure