Current sea water temperature:
+78.8°F
| Minimum sea water temperature in April: | 83.8°F |
| Maximum sea water temperature in April: | 72.5°F |
| Average sea water temperature in April: | 78.7°F |
| more information | |
14 days
forecast
forecast
| Key West |
monthly
weather
weather
| Key West |
Sea water temperature for the last 10 days:
| April 26 | 78.8°F | April 21 | 79.2°F |
| April 25 | 77.4°F | April 20 | 78.6°F |
| April 24 | 78.4°F | April 19 | 77.9°F |
| April 23 | 78.3°F | April 18 | 77.4°F |
| April 22 | 79.5°F | April 17 | 77.0°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:
2025
2024
2023
The average sea water temperature in July of 2025 was 86.7°F. The highest and lowest sea temperatures during the month were 88.0°F and 85.1°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
April
April
| 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: 15:31
April 26, sunday
1800
79°F
SE
2 mph
2 mph
2100
77°F
SE
6 mph
6 mph
April 27, monday
0000
77°F
SW
6 mph
6 mph
0300
77°F
SW
4 mph
4 mph
0600
77°F
S
6 mph
6 mph
0900
77°F
SW
5 mph
5 mph
1200
77°F
SW
6 mph
6 mph
1500
77°F
S
6 mph
6 mph
