Right now, there is the current weather settings and forecast weather settings. If you go into the editor and click on the intel button, you can use the sliders to set both the current and future forecast for all the weather variables in the game. However, there are only two currently implemented.

Currently implemented in the game:

fogForecast
overcastForecast

Need to be implemented:

rainForecast
lightningForecast
wavesForecast
windForecast
humidityForecast