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Sea Temperature in Key West in September
Complete information on the sea temperature range in the Gulf of Mexico (Gulf of America) in Key West in September. Historical daily data. Climate details for September. Tips on swimming conditions and beach relaxation in Key West. We find every spot where you can swim and tell you what the water temperature is there today and throughout the year.
Water Temperature Range in Key West in September
28°C
MINIMUN
30.5°C
AVERAGE
33°C
MAXIMUM
Historical Data of Water Temperature in September in Key West
Water Temperature Chart for Gulf of Mexico (Gulf of America) in Key West in September
Sea Temperature Table in Key West in September Over the Past Years
| Day | 2024 | 2023 | 2022 | Average |
|---|---|---|---|---|
| Sep 1 | 30°C | 30°C | 30°C | 29.8°C |
| Sep 2 | 30°C | 30°C | 28°C | 29.5°C |
| Sep 3 | 30°C | 31°C | 28°C | 29.5°C |
| Sep 4 | 30°C | 31°C | 30°C | 30.0°C |
| Sep 5 | 30°C | 31°C | 30°C | 30.3°C |
| Sep 6 | 30°C | 30°C | 29°C | 29.8°C |
| Sep 7 | 31°C | 30°C | 29°C | 30.0°C |
| Sep 8 | 31°C | 31°C | 31°C | 30.8°C |
| Sep 9 | 31°C | 30°C | 29°C | 29.8°C |
| Sep 10 | 31°C | 31°C | 28°C | 30.0°C |
| Sep 11 | 31°C | 29°C | 30°C | 30.3°C |
| Sep 12 | 30°C | 30°C | 31°C | 30.5°C |
| Sep 13 | 30°C | 30°C | 28°C | 30.0°C |
| Sep 14 | 30°C | 30°C | 31°C | 30.8°C |
| Sep 15 | 30°C | 29°C | 28°C | 29.5°C |
| Sep 16 | 30°C | 30°C | 28°C | 30.0°C |
| Sep 17 | 30°C | 30°C | 30°C | 30.3°C |
| Sep 18 | 30°C | 31°C | 31°C | 30.8°C |
| Sep 19 | 30°C | 30°C | 28°C | 29.5°C |
| Sep 20 | 29°C | 30°C | 29°C | 29.8°C |
| Sep 21 | 30°C | 30°C | 29°C | 29.8°C |
| Sep 22 | 30°C | 31°C | 28°C | 29.8°C |
| Sep 23 | 29°C | 30°C | 30°C | 29.5°C |
| Sep 24 | 30°C | 30°C | 31°C | 30.3°C |
| Sep 25 | 30°C | 29°C | 30°C | 29.8°C |
| Sep 26 | 30°C | 30°C | 31°C | 30.0°C |
| Sep 27 | 30°C | 31°C | 31°C | 30.3°C |
| Sep 28 | 30°C | 31°C | 31°C | 30.0°C |
| Sep 29 | 30°C | 30°C | 28°C | 29.0°C |
Key West Climate and Swimming Opportunities in September
31°C
Average Day Air Temperature
25°C
Average Night Air Temperature
200 mm
Precipitation Amount per Month
16 days
Number of Rainy Days
12 hrs
Daylight
per Day
9 hrs
Sunshine
per Day
13 km/h
Average Wind Speed
78%
Average
humidity
Key West lies within the Florida in United States. The average daytime temperature in Key West in September is 89°F (31°C), while the nighttime average is 76°F (25°C). There are typically 16 rainy days during the month, with a total precipitation of 7.9 inches (200 mm). The daylight duration in September in Key West is 12 hours, with an average of 9 hours of sunshine per day. The average wind speed in September is 8 mph (13 km/h), and the humidity level is around 78%.
The water temperature in Key West in September ranges from 84°F to 86°F (29°C to 30°C). At the beginning of the month, the average temperature is around 86°F (30°C), shifting to 86°F (30°C) by mid-September and reaching 86°F (30°C) in the last ten days. Overall, the average sea temperature in Key West for September is 86°F (30°C). The water is almost like a bath, perfect for those who prefer very warm conditions. However, it may not be as refreshing on extremely hot days.
Sea Temperature in September in Nearby Cities
Frequently Asked Questions About Water Temperatures in September in Key West
What is the sea temperature in Key West in September?
The water temperature in the Gulf of Mexico (Gulf of America) in Key West in September ranges from 84°F to 86°F (29°C to 30°C).
Is it possible to swim in the Gulf of Mexico (Gulf of America) in Key West in September?
The average sea temperature in Key West in September is 86°F (30°C), and the air temperature is 89°F (31°C), so the water is almost like a bath, perfect for those who prefer very warm conditions. However, it may not be as refreshing on extremely hot days.