Grow room temperature and humidity

Hello,

I am a bit worried, I have both a Hygrometer and a Thermometer within my grow room, in the day when the lamp is on the Thermometer measures around 31-32 degrees celsius ( 87 -89 degrees farenheit).

In the night my thermometer measures 21 degrees celsius ( 69 farenheit). My hygrometer measures around 60% in the day while the lamp on , and a 70% when I water, but at the night it increases to near 100%?!

Is this alright?, I was told plants can deal with this humidity for short periods of time but it's long periods that kill them, is this true and is my grow just too humid to grow anything?

Have you got an exhaust and fans in there? The 60 to 70% during the day is OK while in veg but you want it lower than that for flowering. When the lights are off and you dont have an exhaust or fan running then the humidity will sky rocket. The temp is not in the ideal range but its not too far off it to cause much damage - the humidity at night though is a problem and im guessing it is due to lack of ventilation.

Ahh!, That's what it may be!, noobish mistake on my part, when I turn the lights off the fans also go off too, as they're plugged into the same power surge socket.

I was thinking about using a mini dehumidfier in my room, would this actaully do anything?, it's a small tent, a DR60 to be exact.

Id get me a dehumifier too bro,especially if the fan dont bring your humidity down,that temp difference and your high humidity will breed PM,Ive had pm once and thats how I got it,My night time humidity was about 70 to 80 % and my daytime and night time temps were about 15 to 18 degrees difference.I had to get a sulfer burner after I caught pm,that shit never goes away and puts spores all in your home