Key West Weather in March
March carries on with the warm, dry weather that Key West, Florida basks in during winter. Plus the sun shines even more now than it did previously.
This page gives detailed information on the typical March temperature, precipitation, sun, humidity, wind and storms for Key West. The numbers here are historical averages based on climate data gathered at the Key West International Airport, located on Key West Island.
Temperature
| 80 °F | March average high | 26 °C |
| 69 °F | March average low | 21 °C |
| 17 days | 80 °F max. or more (27 °C) |
| 18 days | 70 °F min. or less (21 °C) |
The temperature rises nearly every day in March to over 70 degrees Fahrenheit (21 degrees Celsius) in Key West. Temperatures above 90 °F (32 °C) are not expected here this month.
The thermometer dips to 60 °F (16 °C) or below on an average of three nights. But March does not normally get as cold as 50 °F (10 °C).
Rain
| 1.5 in | total precipitation | 39 mm |
| 5 days | of rain |
Half the time, Key West receives 0.7 to 2.1 inches (17 to 53 mm) of rainfall in March. One in four years has drier weather, while another one in four is wetter.
Sun
| 82 % | sunshine |
| 13 days | clear skies |
The sun's rays reach the ground in Key West during 82 percent of daylight hours on average in March, for a total of 306 hours in the month. Typically on 13 days this month the sky is mainly clear, with at most 30 percent cloud cover.
Sunlight in March at Key West lasts for 12 hours and 1 minute a day on average. The shortest day of the month is the 1st with 11 hours and 40 minutes of daylight. By the end of the month, the days have lengthened to 12:23 from sunrise to sunset. These durations can vary by a minute or two from year to year.
Humidity
| 73 % | March average humidity |
The relative humidity in Key West during March usually peaks at 79 percent in the morning then drops to 66 percent by early afternoon.
| Local Time | 1 am | 4 am | 7 am | 10 am | 1 pm | 4 pm | 7 pm | 10 pm | Humidity % | 77 | 78 | 79 | 70 | 66 | 66 | 73 | 76 |
Wind
| 12.0 mph | March wind speed average | 19.3 kph |
March is windier than most other months in Key West.
Storms
| 1 day | rainfall of 0.5 inches (13 mm) or more |
| 2 days | with thunderstorms in March |
Reference
The weather data here are long-term averages provided by the US National Centers for Environmental Information (NCEI). Temperature and precipitation are 1991-2020 normals while humidity and thunderstorms are 1961-1990 normals.