You should be able to find humidity info for your area online with one of the many weather websites that are out there.It’s been kinda hot, upper 80’s, here the last few days. Should I mist them with water? I don’t have a real way to measure humidity.
without a flue cure chamber or kiln you are left with the option of either air curing or sun curing your leaf.
To air cure your leaf your first step will be color curing. If your leaf is mature (usually starting to yellow at the tip) you can pick them and either hang them somewhere with humidity that runs in the 60-80 % range at night and not much below 40% during the day. Temperatures will have a big impact as well and the process can be a little tricky. The idea is to get the leaves to slowly dry down over the course of about a week or so to a yellow or brownish color with out growing mold (too much humidity) or drying green (to little humidity). If your humidity is to low you can mist them or come up with an idea for increasing the humidity (hose the ground down around them, etc). Once they reach a yellow or brown color they can be air cured by drying down to a darker brown color and either hung/stored in a suitable environment or kilned.
If you can not color cure because your weather does not allow you can try the box curing method described elsewhere in the forum. Basically take a leaf, put it between a sheet of newspaper, repeat. Put your stacks of leaf in newspaper in a cardboard box for about 5 days to a week until you see them yellow. Once yellowed they are color cured and can then be air cured. I have not tried the box curing method, read up on it from others that have.
Your second choice is sun curing. Pick a mature leaf and let them wilt (usually pick and let sit overnight). Then place them in full sun while trying to keep the humidity up. Put em on a moist lawn or on a screen over a moist area, or in a semi open plastic bag, etc. If all goes well they should turn a lighter brown color and be dried down in 2-3 days time (depending on conditions of course). If they get dry and crispy while green your humidity got to low. I could be wrong but I don't think people typcally use sun curing for cigars tobacco though.
One of the more full proof ways to color cure and air cure is to simply stalk harvest the whole plant. When the plant is mature cut the whole plant down and hang it upside down. It takes a lot longer for the leaves to turn brown when stalk harvested but the whole color curing process is more forgiving about low humidity conditions.
If you are not stalk harvesting make sure the leaf is fully mature before you pick it. It makes color curing much easier if the leaf is starting to yellow slightly while still on the plant.
Some varieties like Conneticut broadleaf don't have much of a yellow stage during the color curing process. What variety are you growing?