Weather in September 2025

Key West weather in September 2025

°C °F

The average weather in Key West in September

The temperatures in Key West during September are extremely high, between 28°C and hot as 29°C, drinking water regularly is advisable.

You can expect rain for roughly half of the month of September in Key West. We’re expecting roughly 8 to 15 days of rain, so your rubber boots and umbrella are going to see plenty of use this month if you’re keen on staying dry.

Our weather forecast can give you a great sense of what weather to expect in Key West in September 2025.

If you’re planning to visit Key West in the near future, we highly recommend that you review the 14 day weather forecast for Key West before you arrive.

Temperatures
29° / 28°
Rainy Days
12
Snowy Days
0
Dry Days
18
Rainfall
286
mm
Sun Hours
11.6
Hrs

Explore the weather in Key West in other months

Key West annual weather

Month Temperatures Rainy Days Dry Days Snowy Days Rainfall Weather More details
January 22° / 20° 3 28 0 67 mm
Good
February 23° / 21° 2 26 0 60 mm
Perfect
March 23° / 22° 1 30 0 36 mm
Perfect
April 25° / 24° 3 27 0 81 mm
Perfect
May 27° / 26° 6 25 0 150 mm
Perfect
June 28° / 27° 9 21 0 198 mm
Good
July 29° / 28° 10 21 0 221 mm
Ok
August 30° / 28° 11 20 0 260 mm
Ok
September 29° / 28° 12 18 0 286 mm
Ok
October 28° / 27° 8 23 0 251 mm
Good
November 25° / 24° 3 27 0 93 mm
Perfect
December 24° / 22° 2 29 0 70 mm
Perfect

Weather in Key West in September - FAQ

What is the average temperature in Key West in September?
The average temperature in Key West in September is 28/29° C.
What is the chance of rain in Key West in September?
On average, there are 12 rainy days in Key West during September.
Weather wise, is September a good time to visit Key West?
The weather in Key West in September is ok.
Can it snow in Key West in September?
On average, there are 0 snowy days in Key West in September.
More about the weather in Key West