Current sea water temperature:
+77.9°F
| Minimum sea water temperature in March: | 80.2°F |
| Maximum sea water temperature in March: | 70.7°F |
| Average sea water temperature in March: | 75.8°F |
| more information | |
14 days
forecast
forecast
| Key West |
monthly
weather
weather
| Key West |
Sea water temperature for the last 10 days:
| March 16 | 77.9°F | March 11 | 79.3°F |
| March 15 | 77.5°F | March 10 | 78.8°F |
| March 14 | 77.9°F | March 9 | 77.5°F |
| March 13 | 78.6°F | March 8 | 76.8°F |
| March 12 | 79.5°F | March 7 | 76.3°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
March
March
| 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: 15:04
March 16, monday
1800
81°F
NE
4 mph
4 mph
2100
79°F
NE
14 mph
14 mph
March 17, tuesday
0000
79°F
NE
14 mph
14 mph
0300
77°F
SE
18 mph
18 mph
0600
75°F
S
19 mph
19 mph
0900
73°F
S
19 mph
19 mph
1200
72°F
S
18 mph
18 mph
1500
70°F
S
21 mph
21 mph
