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Sanibel Island weather essentials. Sanibel can be enjoyed all year round. Mid-December through mid-February are the coldest months, and June thru the end of November are hurricane season. Sanibel rarely see long spells of cold weather. Officially, Key West is the only 'frost free' location in the continental US, but sitting in the warm Gulf, Sanibel and Captiva are nearly as mild.
Overall, weather in the San Juans is milder with about twice as many sunny days and about half as much rain as Seattle area. This is because the San Juan Islands are part of a rain shadow that also includes part of Whidbey Island and the area around Sequim and Port Townsend on the mainland. Daytime temperatures in the 70's are common in summer and 40's in winter. Plan for a range of temperatures, but nothing very severe.