Current Sea Water Temperature:
+81.8°F
| Maximum Sea Water Temperature in March: | 83.6°F |
| Minimum Sea Water Temperature in March: | 73.0°F |
| Average water temperature in March: | 78.6°F |
| detailed information | |
Sea Water Temperature for the Last 10 Days:
| March 13 | 81.8°F | March 08 | 79.8°F |
| March 12 | 82.8°F | March 07 | 79.2°F |
| March 11 | 82.6°F | March 06 | 79.4°F |
| March 10 | 82.0°F | March 05 | 78.2°F |
| March 09 | 80.6°F | March 04 | 78.4°F |
When is the Warmest Sea for Key West?
According to our data for the last three years for Key West the highest average sea water temperature was in August, July and September.
Average Water Temperature by Month, °F
Sea Water Temperature in August
The average sea surface temperature in August 2025 for Key West was 93.1°F. The maximum and minimum values were 91.0°F and 95.2°F respectively.
Sea Water Temperature in July
The average sea surface temperature in July 2025 for Key West was 90.8°F. The maximum and minimum values were 89.0°F and 92.2°F respectively.
Sea Water Temperature in September
The average sea surface temperature in September 2025 for Key West was 91.0°F. The maximum and minimum values were 89.2°F and 93.6°F respectively.
USA Resorts:
NAME
F°
| Chicago |  |
+42 |
| Hawaii |  |
+74 |
| Honolulu | |
+74 |
| Houston |  |
+82 |
| Las Vegas | |
+88 |
| Los Angeles | |
+98 |
| Maui |  |
+70 |
| Miami | |
+86 |
| Miami Beach | |
+86 |
| New York |  |
+42 |
| San Diego | |
+98 |
| San Francisco | |
+70 |
| Sarasota | |
+80 |
| Tampa | |
+82 |
| Washington | |
+56 |
Countries:
NAME
POPULARITY
24 Hours Weather Forecast
Key West
Local time: 14:35
13 mar, friday
| 1500 |  |
80°F | N 5 mph |
| 1800 |  |
82°F | N 4 mph |
| 2100 |  |
78°F | W 2 mph |
14 mar, saturday
| 0000 | |
76°F | NW 6 mph |
| 0300 |  |
74°F | NW 3 mph |
| 0600 | |
74°F | W 3 mph |
| 0900 | |
76°F | W 6 mph |
| 1200 | |
76°F | NW 8 mph |