m0useanswered grow question 7 months ago That is not ideal. 90-100% RH on a nromal day. ouch.
You could run a dehumidifier 24/7 to get the RH in range and hope the temps stay the same but there is a massive cost input to that from just running the equipment to achueve that,not counting lights and fans, no telling if it can even get RH down to where it needs to be either 40%. Plus being in a cellar it might be more prone to molds and mildews overall.
I would not do this and would just take my chances outside with autoflowers in earth or containers.
Good Luck!