Water temperature in Key West
83.9
°F
May 21, 05:44
Trend:
stableYesterday:
84.5°FTomorrow:
84.0°F
Sunrise:
Sunset:
Day Length:
13 h. 26 min.Key West in May
Minimum:
69.6°FAverage:
74.7°FMaximum:
77.3°FSea water temperature in Key West today
As of now, in Key West, the water temperature is 83.9°F. Swimming in water of this temperature is considered highly warm and would be enjoyable for everyone. At this temperature, you can comfortably engage in water-based activities for extended periods without experiencing discomfort. Today's reading is 0.8°F higher than the average recorded on this particular day in recent years. The sea temperature remains approximately unchanged from yesterday. According to the forecast, we expect the temperature to stay about the same.Recent sea temperature and forecast
Today's water temperature is considerably lower than the average registered over the last two weeks, indicating a slight cooling trend. It also falls within the range of the average temperature recorded for this date, suggesting a consistent weather trend. The maximum temperature recorded for this date was 85.9°F on 2025, while the historical minimum was 80.2°F on 2018.
Daily water temperature in Key West
| Date |
Current Year
actual* / forecast** |
last year | 10 years average |
|---|---|---|---|
| May 7 | 83.4°F | 82.1°F | 81.8°F |
| May 8 | 83.2°F | 82.2°F | 81.9°F |
| May 9 | 85.3°F | 82.6°F | 82.0°F |
| May 10 | 86.6°F | 82.8°F | 82.2°F |
| May 11 | 85.1°F | 82.7°F | 82.1°F |
| May 12 | 85.9°F | 82.8°F | 82.2°F |
| May 13 | 86.8°F | 82.2°F | 82.1°F |
| May 14 | 86.4°F | 82.1°F | 82.2°F |
| May 15 | 85.1°F | 82.6°F | 82.4°F |
| May 16 | 85.3°F | 82.7°F | 82.5°F |
| May 17 | 85.7°F | 84.4°F | 82.9°F |
| May 18 | 86.1°F | 83.3°F | 83.0°F |
| May 19 | 84.8°F | 85.0°F | 83.0°F |
| May 20 | 84.5°F | 85.3°F | 83.2°F |
| May 21 | 83.9°F | 85.9°F | 83.1°F |
| May 22 | 84.0°F | 84.5°F | 83.2°F |
| May 23 | 84.2°F | 85.7°F | 83.4°F |
| May 24 | 84.2°F | 86.9°F | 83.4°F |
| May 25 | 84.2°F | 86.8°F | 83.4°F |
| May 26 | 83.9°F | 86.1°F | 83.1°F |
| May 27 | 83.7°F | 86.4°F | 82.9°F |
| May 28 | 84.0°F | 85.8°F | 83.3°F |
* actual - actual temperature values
** forecast - projected values for the next week
Real-time coastal temperatures could deviate by several degrees from the provided readings. These deviations often become evident following intense rainfall or strong winds.
Our forecasting methodology leverages a mathematical model, that uses current water and weather conditions, historical records, wind intensity and direction.