You might spend a lot of your vacation inside, but if you're planning to venture beyond the casino, looking at local weather trends is a good idea. The hottest months are usually August and July with an average temp of 59°F, while the coldest months are February and December with an average of 43°F. The rainiest months in Astoria are November, December, January, and March, with each month seeing an average of 9 inches of rainfall.