It's hard to call off games due to weather. Most of us love to play so much that we'll endure rain, cold, snow or extreme heat in order to play the game we love.
Futsal outdoors poses special challenges because moisture can linger on surfaces even when the sun is shining and temperatures are mild. The plastic tiles that we play on at The Cage provide a good surface when they are dry, but they are nasty and treacherous when wet. A situation that is particularly hard to judge is when the court appears to be dry, but there is also a significant amount of moisture in the air.