March weather in Key West, FL
The average temperature in Key West in March is 72.8°F (66.8°F–78.8°F). Average precipitation: 1.41 inches.
March is a spring month in Key West, and is cooler than the annual average of 77.4°F. Daily temperatures swing about 12°F between overnight low and afternoon high. Expect about 6 days with precipitation. Daylight averages about 11h 51m. For travel, March is one of the best months of the year to visit.
Avg High
78.8°F
Avg Low
66.8°F
Precipitation
1.41 in
Daylight
11h 51m
March records in Key West
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| March 1 | 84.0°F (2023) | 59.0°F (2020) | 0.21 in (2017) |
| March 2 | 84.0°F (2026) | 55.0°F (2013) | 0.01 in (2013) |
| March 3 | 84.9°F (2026) | 55.0°F (2013) | 0.21 in (2013) |
| March 4 | 84.9°F (2026) | 54.0°F (2013) | 0.07 in (2026) |
| March 5 | 86.0°F (2023) | 53.1°F (2013) | 0.33 in (2022) |
| March 6 | 84.9°F (2026) | 57.0°F (2013) | 0.77 in (2014) |
| March 7 | 84.9°F (2026) | 59.0°F (2013) | 0.29 in (2024) |
| March 8 | 86.0°F (2026) | 60.1°F (2013) | 0.12 in (2022) |
| March 9 | 86.0°F (2026) | 59.0°F (2014) | 0.06 in (2020) |
| March 10 | 86.0°F (2026) | 63.0°F (2013) | 0.62 in (2018) |
| March 11 | 84.9°F (2015) | 63.0°F (2014) | 0.01 in (2018) |
| March 12 | 84.0°F (2022) | 64.0°F (2025) | 1.49 in (2018) |
| March 13 | 84.0°F (2019) | 57.9°F (2018) | 0.27 in (2017) |
| March 14 | 84.9°F (2015) | 62.1°F (2018) | 0.01 in (2025) |
| March 15 | 84.9°F (2022) | 59.0°F (2018) | 0.10 in (2019) |
| March 16 | 84.9°F (2016) | 57.9°F (2017) | 0.69 in (2026) |
| March 17 | 84.9°F (2024) | 62.1°F (2017) | 1.62 in (2026) |
| March 18 | 86.0°F (2022) | 62.1°F (2026) | 0.41 in (2014) |
| March 19 | 86.0°F (2022) | 62.1°F (2025) | 1.89 in (2024) |
| March 20 | 84.0°F (2016) | 62.1°F (2025) | 0.10 in (2019) |
| March 21 | 84.9°F (2020) | 57.9°F (2025) | 0.06 in (2016) |
| March 22 | 84.0°F (2022) | 57.0°F (2025) | 1.95 in (2024) |
| March 23 | 84.9°F (2022) | 57.9°F (2019) | 0.33 in (2024) |
| March 24 | 84.9°F (2021) | 63.0°F (2018) | 0.18 in (2015) |
| March 25 | 84.9°F (2015) | 64.9°F (2013) | 1.26 in (2014) |
| March 26 | 86.0°F (2015) | 57.9°F (2013) | 0.01 in (2015) |
| March 27 | 86.0°F (2016) | 55.9°F (2013) | 0.46 in (2015) |
| March 28 | 84.9°F (2016) | 59.0°F (2013) | 0.06 in (2024) |
| March 29 | 84.9°F (2020) | 62.1°F (2013) | 3.23 in (2025) |
| March 30 | 84.9°F (2020) | 64.0°F (2015) | 0.10 in (2023) |
| March 31 | 86.0°F (2016) | 60.1°F (2015) | 0.03 in (2023) |