Key West, Florida Weather in August

August weather

Key West feels hot, sticky and often showery in August. The high is 30°C, with 75% humidity, so walking Duval Street can feel tiring by midday. Rain falls on 26 days, but showers don't necessarily last all day. July is drier; September is a little wetter.

You can still enjoy the water, and a morning snorkel trip gives you a better chance of dodging afternoon storms. Fort Zachary Taylor's beach works for a swim between showers. Save long outdoor walks for cooler parts of the day, and don't count on a dry afternoon for a bike ride around Old Town.

Lobsterfest and summer pace

Key West Lobsterfest is an August highlight, with spiny lobster dishes and a street fair on Duval Street. It's a good time to try local lobster, though the heat can make a crowded street feel close and sweaty. August is also hurricane season, so storms can disrupt boat trips and flights.

If you hate crowds, you'll usually find August quieter than the busy winter months. Summer is low season, and hotel rates are often lower than in January and February. Lobsterfest brings more people into town, though, so expect a livelier Duval Street during the event.

Making the most of your visit

Travelling with kids? Plan a beach visit at Fort Zachary Taylor before the hottest part of the day, then take a break indoors at the Key West Aquarium. Its compact size makes it an easier outing than a long walk in the humidity.

For a local-weather tip, keep your plans flexible around Mallory Square. Its sunset gathering is outdoors, so a passing shower can interrupt the evening. If the sky turns dark, duck into a nearby Duval Street café and come back when it clears. Check local storm updates before setting out on a ferry or snorkeling trip.