Now that you mentioned humidity, I found out that there is no barometer (= air pressure) or chronometer (= humidity) icon yet within the icons8 iconset. Something like this would be nice. There is a pressure icon, but I think that is more intended for industrial meaning. Many people have three of these meters in their houses: thermometer, barometer and a chronometer. barometer: chronometer:
The barometer has a clock-hand with a manual cursor that can be adjusted to "remember" the previous position of the clock-hand. The above icon shows such clock-hand with cursor. The chronometer or hygrometer could best be shown as a meter with some condensation drops, not water drops. For humidity only icon, waterdrops are okay imho. By the way, there is also a hydrometer missing in the iconset. Yes, I said HyDro, not hyGro :-) For a hyDro meter I would suggest the second picture of the wiki page:

LOL at wiki page of hygrometer:​ --> "not to be confused with hydrometer".

Do you have some icons in mind? What about this example:
It shows a hygrometer giving a humidity value on a scale from 0 to 100 degrees. Another icon would be only a few waterdrops. Now you have two icons, one for measurement and one for weather. If you like these suggestions, or have better alternatives, please leave a comment (with links to your suggestions).