Gainor Beach Custom Search   During the summertime months, highs ordinarily are in the 50's at Gainor Beach, and throughout summer nights temperatures are in the 40's. All through the winter highs are in the 30's while the cold winter nights at Gainor Beach are in the 20's. Gainor Beach sees pretty high levels of rainfall. Through the month of November you get the most rain around here, and the driest of the months is June.            Map Detailed Map Weather Local weather forecast These outdoors activities are available near Gainor Beach.