Key West, United States

Key West by month

Key West in September

September in Key West brings highs around 89°F (32°C), lows near 79°F and about 16 rainy days. The sun sets around 7:32 pm. The sea is about 85°F (30°C). It's off season for sightseeing: hot and quieter.

Photo: Julian Lupyan, CC0

What September is good for in Key West

Each activity rated for September's weather and sea.

September next to August and October

Month	August	September	October
High	91°F (33°C)	89°F (32°C)	86°F (30°C)
Low	80°F (27°C)	79°F (26°C)	77°F (25°C)
Rainy days	15	16	12
Sea	86°F	85°F	83°F
Sunset	8:02 pm	7:32 pm	7:01 pm
Daylight	13 h 00 min	12 h 19 min	11 h 36 min

Averages for Key West Int'l, Florida, 1991–2020; sunrise and sunset on the 15th. Key West water temperature by month.

Tours in Key West

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Questions

Is September a good time to visit Key West?

It's off season for sightseeing: hot and quieter. The most comfortable months overall are January, February, March and December.

How hot is Key West in September?

Average highs are about 89°F (32°C) and lows about 79°F (26°C).

Does it rain much in Key West in September?

September averages 16 rainy days, against 16 in the wettest month.

How warm is the sea in Key West in September?

About 85°F (30°C). Warm enough for long swims and snorkeling.

Other cities in September

Everything to do in Key West