May weather in Key West, FL
The average temperature in Key West in May is 79.8°F (74.0°F–85.6°F). Average precipitation: 3.71 inches.
May is a spring month in Key West, and is warmer than the annual average of 77.4°F. Daily temperatures swing about 11.6°F between overnight low and afternoon high. Expect about 8 days with precipitation. Daylight averages about 13h 12m. For travel, May is a comfortable month to visit.
Avg High
85.6°F
Avg Low
74.0°F
Precipitation
3.71 in
Daylight
13h 12m
May records in Key West
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| May 1 | 87.1°F (2014) | 70.0°F (2023) | 0.58 in (2013) |
| May 2 | 88.0°F (2016) | 66.0°F (2023) | 4.36 in (2013) |
| May 3 | 88.0°F (2016) | 66.9°F (2013) | 0.31 in (2018) |
| May 4 | 87.1°F (2021) | 69.1°F (2023) | 0.42 in (2016) |
| May 5 | 88.0°F (2024) | 69.1°F (2023) | 0.89 in (2019) |
| May 6 | 88.0°F (2023) | 68.0°F (2016) | 0.24 in (2016) |
| May 7 | 89.1°F (2014) | 66.9°F (2017) | 3.14 in (2019) |
| May 8 | 89.1°F (2024) | 63.0°F (2017) | 1.18 in (2018) |
| May 9 | 88.0°F (2014) | 66.0°F (2017) | 0.21 in (2022) |
| May 10 | 89.1°F (2014) | 69.1°F (2020) | 0.69 in (2020) |
| May 11 | 89.1°F (2023) | 69.1°F (2017) | 0.23 in (2025) |
| May 12 | 89.1°F (2023) | 71.1°F (2018) | 1.45 in (2025) |
| May 13 | 90.0°F (2024) | 68.0°F (2022) | 3.10 in (2018) |
| May 14 | 91.0°F (2024) | 69.1°F (2018) | 1.12 in (2020) |
| May 15 | 91.0°F (2024) | 72.0°F (2013) | 0.37 in (2015) |
| May 16 | 90.0°F (2016) | 72.0°F (2021) | 1.11 in (2018) |
| May 17 | 91.9°F (2024) | 70.0°F (2012) | 1.34 in (2012) |
| May 18 | 91.9°F (2024) | 73.0°F (2012) | 0.26 in (2020) |
| May 19 | 91.0°F (2024) | 71.1°F (2012) | 1.00 in (2012) |
| May 20 | 89.1°F (2017) | 71.1°F (2012) | 2.61 in (2024) |
| May 21 | 90.0°F (2022) | 71.1°F (2018) | 1.50 in (2018) |
| May 22 | 90.0°F (2022) | 73.0°F (2018) | 0.20 in (2023) |
| May 23 | 89.1°F (2015) | 71.1°F (2014) | 1.17 in (2023) |
| May 24 | 90.0°F (2016) | 70.0°F (2023) | 1.46 in (2023) |
| May 25 | 91.0°F (2013) | 72.0°F (2016) | 2.48 in (2018) |
| May 26 | 90.0°F (2025) | 73.0°F (2018) | 1.05 in (2018) |
| May 27 | 90.0°F (2025) | 73.0°F (2016) | 0.75 in (2023) |
| May 28 | 91.0°F (2025) | 73.0°F (2013) | 2.32 in (2013) |
| May 29 | 91.0°F (2025) | 72.0°F (2013) | 3.31 in (2013) |
| May 30 | 90.0°F (2017) | 71.1°F (2016) | 1.75 in (2016) |
| May 31 | 91.9°F (2024) | 73.9°F (2016) | 0.79 in (2016) |