Current sea water temperature:
+87.8°F
| Minimum sea water temperature in July: | 91.0°F |
| Maximum sea water temperature in July: | 82.8°F |
| Average sea water temperature in July: | 86.6°F |
| more information | |
14 days
forecast
forecast
| Key West |
monthly
weather
weather
| Key West |
Sea water temperature for the last 10 days:
| July 16 | 87.8°F | July 11 | 88.9°F |
| July 15 | 88.3°F | July 10 | 89.4°F |
| July 14 | 88.0°F | July 9 | 90.0°F |
| July 13 | 88.7°F | July 8 | 89.4°F |
| July 12 | 88.3°F | July 7 | 89.8°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 89.0°F. The highest and lowest sea temperatures during the month were 90.0°F and 87.8°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
July
July
| 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: 07:59
July 16, thursday
0900
86°F
SW
11 mph
11 mph
1200
91°F
W
12 mph
12 mph
1500
90°F
W
9 mph
9 mph
1800
88°F
W
6 mph
6 mph
2100
86°F
W
6 mph
6 mph
July 17, friday
0000
84°F
W
11 mph
11 mph
0300
84°F
W
9 mph
9 mph
0600
84°F
W
7 mph
7 mph
