Temp and Humidity in my grow

Have been monitoring the temps and humidity in my closet grow and the humidity has been getting very low and the heat is getting very high. This is with no air extraction as I cannot put any in the built in wardrobe BUT there is a small amount of ventilation.

Are these numbers okay? I'm using a Mars Hydro 300 and have a fan which I haven't actually started using yet as the plant is very small and I don't see the point in using it so temps should go down a small amount when I begin using that

Too hot for an indoor grow. Get your temps below 80F and add air exchange or you are wasting your time.

Ventilation
Air movement
Light

Electrum said:

temps should go down a small amount when I begin using that

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No it won't.

Heat is going nowhere.

Rh will fluctuate based on media moisture and transpiration. I know when it's time to water looking at Rh readings.

you need a fliter running to extract heat and a vent so it can pull clean air in .. as stated without its pointless your heat at the moment is 91f. . thought mine was high when it hits 80f

Ya that temp is running too high, try get it to 27-29c max. As for RH, its always better to have 60%+ in veg stage but 20-30-50% is fine too, as the plant puts on more leaves and mass it will help to increase the RH. Flowering is another story tho.

lights on my room runs about 82F maybe 84 on a high side and rh 50% and my girls thrive but I keep a lot of air moving in the room. when lights are out I keep my room 72 and rh 80% that's what I have found works best for me. your plants won't die from the heat as long as you keep them watered and air moving but there growth rate wont be as fast. Easy cheap thing to do is put a small space heater in the area (if you have room) to turn on at lights out and put a small shallow pan of water in front of it and keep it 72-74F and the room sealed it will get your rh up and will make a huge difference in a bind.