Current sea water temperature:
+85.3°F
| Minimum sea water temperature in May: | 90.0°F |
| Maximum sea water temperature in May: | 77.7°F |
| Average sea water temperature in May: | 82.1°F |
| more information | |
14 days
forecast
forecast
| Key West |
monthly
weather
weather
| Key West |
Sea water temperature for the last 10 days:
| May 16 | 85.3°F | May 11 | 85.1°F |
| May 15 | 85.1°F | May 10 | 86.5°F |
| May 14 | 86.4°F | May 9 | 85.3°F |
| May 13 | 86.9°F | May 8 | 83.3°F |
| May 12 | 85.8°F | May 7 | 83.3°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
May
May
| 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: 17:51
May 16, saturday
1800
82°F
W
11 mph
11 mph
2100
82°F
W
15 mph
15 mph
May 17, sunday
0000
82°F
W
18 mph
18 mph
0300
81°F
NW
15 mph
15 mph
0600
81°F
NW
13 mph
13 mph
0900
81°F
W
16 mph
16 mph
1200
82°F
W
16 mph
16 mph
1500
82°F
W
16 mph
16 mph
