Tomorrow's May Day, which means only a few short weeks to summer! In most places, it's time to put sweaters in storage and crank up the A/C, but in San Francisco we're getting ready for foggy, cool nights that just aren't quite chilly enough to turn on the heat. Sure, we get sun during the day, but since SF buildings typically have wimpy insulation, the lightweight throw blanket becomes an indispensable fixture for summer. We've rounded up a few of our favorites for the coming season...

• 1 Diana Wilson's Rainy Day large throw, made of soft lambswool, is huge for cuddling. Also comes in aqua blue. 166 British pounds (about $247). (Spotted on Lena Corwin's lovely blog.)

• 2 We also love Diana Wilson's Wooly Wood large throw, which comes in two nice netural colorways, brown and charcoal gray, for 166 pounds.

• 3 The Austrian line David Fussenegger is best known for baby blankets, but these full-size cotton throws are equally fuzzy and wonderful. Plus, they're machine-washable—great for houses with pets. They run in the $100 dollar range (sometimes more or less, depending on size and style). Locally, they're available at Flora Grubb Gardens and Egg/The Urban Mercantile.

• 4 West Elm's new organic cotton knit throw is super soft, machine washable, and only $49. The loose knit makes it nice and breathable for a summer night as well.

• 5 These woven silk throws from Vivaterra won't pill, and they're nice and big (we hate a throw that doesn't go over our feet). Comes in a pale neutral or a jewel-toned red, so it's doable for almost any room.