Yes, water evaporates faster on a hot day than a cold day. It's all about that relative humidity. Additional moisture in the air only helps prevent wildfire if

Yes, water evaporates faster on a hot day than a cold day. It's all about that relative humidity. Additional moisture in the air only helps prevent wildfire if it leads to an increase in rain. So if moist air blows in from somewhere else and then cools down, you will have a reduced risk of wildfire in that location. However, the location that lost its moist air will be drier and have an increased fire risk.