Planning for the weather is a good way to make your trip to Seascale relaxing and enjoyable, especially when you’re splurging. The hottest months are usually July and August with an average temp of 57°F, while the coldest months are February and January with an average of 42°F. The rainiest months in Seascale are December, November, October, and August, with each month seeing an average of 7 inches of rainfall.