I found that if i use a UV LED flashlight against a BME280 temperature increase dramatically and humidity decrease the same way, instead pressure seems not affected.
The spectrum of LED UV flashlight is this one, taken with an Ocean Optics USB2000+ UV spectrophotometer
Is the sensor so sensible to UV light?
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Yes the UV light goes directly inside but I discovered that the UV flashlight warm all surfaces, also my skin. I don't know if it is an effect of UV or the flashlight has also an IR emission. White LED flash doesn't have this effect but I don't feel warm if I use it on my skin.
Anyway the graph shows that it is not a photoelectric effect since the warming and the cooling are not immediate.