Current sea water temperature:
+88.7°F
| Minimum sea water temperature in August: | 91.4°F |
| Maximum sea water temperature in August: | 83.5°F |
| Average sea water temperature in August: | 87.2°F |
| more information | |
14 days
forecast
forecast
| Key West |
monthly
weather
weather
| Key West |
Sea water temperature for the last 10 days:
| August 5 | 88.7°F | July 31 | 87.6°F |
| August 4 | 89.1°F | July 30 | 88.2°F |
| August 3 | 89.2°F | July 29 | 87.6°F |
| August 2 | 88.2°F | July 28 | 88.0°F |
| August 1 | 87.8°F | July 27 | 88.2°F |
Monthly sea water temperature, °F
When is the warmest sea in Key West?
Based on the data about daily sea water temperature for the last three years the warmest sea in Key West was noticed in August, July and September.
Monthly Sea Temperatures in Key West, °F
Sea water temperature in August, °F
Show year:
2025
2024
2023
The average sea water temperature in August of 2025 was 88.8°F. The highest and lowest sea temperatures during the month were 90.7°F and 86.9°F.
Sea water temperature in July, °F
Show year:
2026
2025
2024
The average sea water temperature in July of 2026 was 88.5°F. The highest and lowest sea temperatures during the month were 90.0°F and 87.4°F.
Sea water temperature in September, °F
Show year:
2025
2024
2023
The average sea water temperature in September of 2025 was 86.9°F. The highest and lowest sea temperatures during the month were 89.2°F and 85.3°F.
current
weather
weather
| Key West |
weather in
August
August
| Key West |
Best time for vacation in Key West
Key West on a weather map
Places in USA:
Name
°F
24 Hours Forecast
Key West
Local time: 13:20
August 05, wednesday
1500
86°F
W
11 mph
11 mph
1800
81°F
W
12 mph
12 mph
2100
82°F
W
14 mph
14 mph
August 06, thursday
0000
79°F
W
17 mph
17 mph
0300
86°F
W
19 mph
19 mph
0600
86°F
W
17 mph
17 mph
0900
86°F
W
17 mph
17 mph
1200
86°F
W
17 mph
17 mph
