I have four very healthy female plants in a 48”x34”x7’ grow room lined with aluminum foil. Plenty of light. Temp is 74-76 day 66-68 at night (12/12 cycle) humidity is 58-68%, for the last two weeks and they are just starting to bud or flower. Suddenly the room humidity shot up to 90-95% and the walls are foggy with moisture. There’s been no change in watering them every 2-3 days. Any idea what’s going on? And is the humidity dangerous? Will it level off?
I opened the room twice today and ventilated it with a small fan until the walls dried off and humidity went down to 55%. Ideas?
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Welcome @Kwit1970
You will need to get better air circulation/exchange in that room.
In flower, that can ruin a crop if mold/bud rot sets in.
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You need to keep the air moving. I deal with high humidity year round and I have two 6” fans, a 12” occulting fan and a 10” fan in my tent going 24-7. I also have a big fan moving air in the lung room. Happy Growing 
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Welcome to the community. You can also use a Dehumidifier. 
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Do you have an inline ventilation fan pulling the air out out the room
Welcome to the community, and I also have to use a dehumidifier to keep it down. Yes high humidity is a bad thing later in flower mold and rot will destroy you ladies.
I have a nine inch fan constantly blowing out of the room through charcoal filters. I’ve been able to regulate temp and humidity with it pretty well until the buds started to appear. I was interested to know if the new higher rate of water vapor expiration from the plants was normal once they start to flower.
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It’s been raining alot lately. It should go down when the rain stops. Keep alot of air moving when your humidity levels rise or you will get bud mold. A dehumidifier is a option
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High humidity can cause mold
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