Can You Use a Thermal Scope During the Day?

Can you use a thermal scope during the day? Yep, you can. Thermal reads heat, not light, so daylight doesn't stop it working, and it won't hurt the sensor in normal use. The catch is that the image can look flat on hot days, and you should never point the lens at the sun. Here's what to expect.

The short answer

Yes, a thermal scope works in daylight. It sees temperature differences, so it doesn't care whether it's noon or midnight. What changes is contrast. In the middle of a hot day, the ground, rocks and trees heat up close to body temperature, so animals don't stand out as clearly. Early morning and late afternoon usually give a better picture. Just never point it at the sun, because focused sunlight can damage a thermal sensor.

Why the picture changes during the day

Thermal shows the difference between warm and cool. At night, the landscape cools down and a warm-blooded animal pops out against it. During the day, the sun heats everything up.

• Hot afternoons: dirt, rocks and dry grass can get as warm as an animal, or warmer. The image looks washed out and targets blend in.
• Cool, overcast days: often surprisingly good, because the background stays cool.
• Dawn and dusk: usually the sweet spot for daytime thermal. The ground hasn't heated up yet, or it's cooling off.

Shade helps too. An animal bedded down in shade on a hot day can still show up well against sun-baked ground nearby.

The one rule: don't point it at the sun

A thermal lens focuses heat onto the sensor. Point it at the sun and you're focusing a huge amount of heat onto a small spot, which can leave permanent burnt pixels or lines. Most manufacturers warn about this in their manuals, and it's generally not covered as a fault.

• Pop the lens cap on when it's not in use.
• Be careful scanning near the horizon at sunrise and sunset.
• Don't leave it sitting on the dash or bench pointed at the sky.

Is thermal useful in daylight?

It can be. Plenty of hunters use thermal by day to:

• Spot animals bedded in long grass or scrub where your eyes struggle.
• Check a carcass or find a downed animal in cover.
• Confirm zero, since a heat-holding target shows clearly in the daytime too.

For shooting during the day, though, a regular day scope or a digital day/night scope usually gives you more detail. Thermal shows you where the heat is; daylight optics show you what the animal actually looks like.

What if you want one scope for day and night?

That's where digital day/night scopes come in. They give a full-colour image in daylight and switch to night vision with an infrared illuminator after dark. They won't find heat the way thermal does, but they give you one scope that works around the clock. We've covered this in more detail in our guide to day/night scopes for 24-hour hunting.

Shop the gear

• Thermal scopes: heat detection day or night.
• HIKMICRO Stellar SQ50 3.0: a popular thermal rifle scope.
• Night vision scopes: digital day/night scopes for colour by day and IR at night.
• HIKMICRO Alpex 4K A50E: a day/night scope that does both jobs.

FAQ

Will sunlight damage my thermal scope?

Normal daylight won't. Pointing the lens directly at the sun can damage the sensor, so keep the cap on and avoid aiming at the sun.

Why does my thermal look blurry or flat during the day?

Usually it's low contrast, not blur. When everything is a similar temperature there's less difference for the sensor to show. Try a different colour palette or wait for cooler light.

Is thermal better than a day scope in daylight?

For spotting hidden animals, it can be. For seeing detail and identifying your target, a day scope or day/night scope usually wins.

Can I zero my thermal scope during the day?

Yes, as long as your target holds heat differently to its background. Our thermal zeroing guide walks through it.