May is one of the warmer months of the year in Port Saint Lucie, with average highs near 30.6°C and lows around 21.4°C (mean 26°C). It is one of the drier months, averaging 99 mm of rainfall and 70% relative humidity across the period.
May is one of the warmer months of the year in Port Saint Lucie. Across 45 years of records, the warmest May in Port Saint Lucie was 2024 — when the month averaged 28.8°C — while the coldest was 1993 at 23.6°C. Typical May days reach 30.6°C with nights near 21.4°C. The long-term trend is warming, about 0.4°C per decade.
May is one of the drier months in Port Saint Lucie, averaging 99 mm of rainfall. The wettest May on record was 2018 with 301 mm, while the driest was 2000 at 21 mm.
Relative humidity in Port Saint Lucie during May averages 70%. The most humid May was 2018 at 81%, and the least humid was 1981 at 59%.
May receives about 6.4 kWh/m²/day of solar energy in Port Saint Lucie. The sunniest May was 2004 at 7 kWh/m²/day, and the cloudiest was 2018 at 4.8.
Average wind speed in Port Saint Lucie during May is 2.7 m/s. The windiest May was 2007 at 3.5 m/s, while the calmest was 1998 at 2.2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 25.4°C | 25.3°C | 26.3°C | 26.1°C | 27.3°C | +1.9°C |
| Avg High | 30.1°C | 29.5°C | 31.1°C | 30.6°C | 32.2°C | +2.1°C |
| Avg Low | 20.6°C | 21.0°C | 21.5°C | 21.6°C | 22.5°C | +1.9°C |
| Avg Rain | 93 mm | 101 mm | 87 mm | 122 mm | 87 mm | -6 mm |
May temperatures in Port Saint Lucie have risen by about 2.4°C between 1981–1985 and 2021–2025.
May has ranged from a record low of 10.8°C (1999) to a record high of 38°C (2024).
Rainfall in May is one of the drier months, averaging 99 mm, with a wettest year of 301 mm.
A good time to visit Port Saint Lucie
May is a good time to visit Port Saint Lucie, with days averaging 30.6°C and nights around 21.4°C (mean 26°C, warmer than Port Saint Lucie's yearly average) and higher rainfall. November and April are marginally more temperate, but May still suits most travellers.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 33.4°C | 28.5°C | 23.7°C | 37.5°C | 20.0°C | 107 mm | 70% | 2.4 m/s | 6.3 |
| 2024 🔥 | 34.1°C | 28.8°C | 23.5°C | 38.0°C | 20.7°C | 59 mm | 66% | 2.4 m/s | 6.8 |
| 2023 | 30.7°C | 26.1°C | 21.5°C | 34.7°C | 16.9°C | 110 mm | 71% | 2.4 m/s | 6.7 |
| 2022 | 32.5°C | 27.5°C | 22.6°C | 35.6°C | 19.7°C | 60 mm | 69% | 2.7 m/s | 6.6 |
| 2021 | 32.1°C | 27.2°C | 22.4°C | 35.3°C | 19.9°C | 25 mm | 63% | 3 m/s | 6.9 |
| 2020 | 30.3°C | 25.8°C | 21.3°C | 35.3°C | 14.6°C | 161 mm | 71% | 2.8 m/s | 6.2 |
| 2019 | 31.0°C | 26.6°C | 22.2°C | 35.3°C | 19.8°C | 117 mm | 74% | 2.6 m/s | 6.7 |
| 2018 🌧️ | 28.1°C | 25.0°C | 21.9°C | 32.2°C | 19.7°C | 301 mm | 81% | 2.8 m/s | 4.8 |
| 2017 | 32.8°C | 27.3°C | 21.9°C | 36.5°C | 13.9°C | 83 mm | 65% | 2.8 m/s | 6.8 |
| 2016 | 29.1°C | 24.9°C | 20.7°C | 32.4°C | 12.4°C | 251 mm | 74% | 2.3 m/s | 6.5 |
| 2015 | 31.2°C | 26.6°C | 22.1°C | 34.3°C | 16.2°C | 33 mm | 68% | 2.8 m/s | 6.9 |
| 2014 | 30.1°C | 25.7°C | 21.3°C | 35.1°C | 16.9°C | 86 mm | 71% | 2.7 m/s | 6.5 |
| 2013 | 29.2°C | 24.8°C | 20.4°C | 32.9°C | 14.0°C | 141 mm | 72% | 2.7 m/s | 6.1 |
| 2012 | 31.3°C | 26.7°C | 22.0°C | 34.3°C | 20.3°C | 114 mm | 70% | 2.5 m/s | 6.2 |
| 2011 | 32.3°C | 27.0°C | 21.6°C | 35.8°C | 17.5°C | 33 mm | 63% | 2.8 m/s | 6.8 |
| 2010 | 30.8°C | 26.4°C | 21.9°C | 32.8°C | 20.6°C | 61 mm | 74% | 2.6 m/s | 6.6 |
| 2009 | 30.0°C | 26.0°C | 22.0°C | 36.9°C | 18.8°C | 242 mm | 76% | 2.5 m/s | 5.9 |
| 2008 | 31.7°C | 26.5°C | 21.3°C | 35.8°C | 16.7°C | 53 mm | 65% | 3 m/s | 6.7 |
| 2007 | 30.1°C | 25.6°C | 21.0°C | 34.7°C | 15.8°C | 57 mm | 65% | 3.5 m/s | 6.3 |
| 2006 | 32.3°C | 26.6°C | 20.9°C | 35.7°C | 16.2°C | 35 mm | 61% | 2.3 m/s | 6.5 |
| 2005 | 29.4°C | 25.1°C | 20.8°C | 33.7°C | 16.4°C | 148 mm | 74% | 2.4 m/s | 6.1 |
| 2004 | 31.5°C | 26.5°C | 21.5°C | 37.5°C | 18.0°C | 27 mm | 64% | 3.1 m/s | 7 |
| 2003 | 31.7°C | 27.2°C | 22.8°C | 35.3°C | 19.2°C | 104 mm | 72% | 2.3 m/s | 6.3 |
| 2002 | 31.8°C | 27.0°C | 22.1°C | 35.7°C | 19.2°C | 66 mm | 67% | 3.2 m/s | 6.6 |
| 2001 | 30.1°C | 25.4°C | 20.8°C | 34.9°C | 18.9°C | 115 mm | 67% | 2.9 m/s | 6.1 |
| 2000 | 32.5°C | 26.9°C | 21.3°C | 37.5°C | 17.5°C | 21 mm | 61% | 2.8 m/s | 6.9 |
| 1999 | 29.7°C | 24.9°C | 20.2°C | 34.2°C | 10.8°C | 125 mm | 71% | 2.5 m/s | 6.4 |
| 1998 | 29.6°C | 25.1°C | 20.5°C | 32.8°C | 14.0°C | 62 mm | 76% | 2.2 m/s | 6.5 |
| 1997 | 29.4°C | 25.4°C | 21.3°C | 33.1°C | 16.8°C | 119 mm | 75% | 2.5 m/s | 6.2 |
| 1996 | 28.6°C | 25.0°C | 21.5°C | 30.7°C | 19.3°C | 161 mm | 80% | 2.5 m/s | 6.2 |
| 1995 | 30.1°C | 26.1°C | 22.0°C | 33.2°C | 19.6°C | 75 mm | 78% | 2.3 m/s | 6.7 |
| 1994 | 29.8°C | 25.5°C | 21.1°C | 34.9°C | 15.4°C | 84 mm | 72% | 2.4 m/s | 6.6 |
| 1993 ❄️ | 27.7°C | 23.6°C | 19.5°C | 31.4°C | 15.7°C | 100 mm | 76% | 2.8 m/s | 6.2 |
| 1992 | 30.1°C | 24.6°C | 19.0°C | 33.8°C | 11.3°C | 36 mm | 64% | 2.7 m/s | 6.7 |
| 1991 | 28.9°C | 25.7°C | 22.5°C | 31.6°C | 20.3°C | 154 mm | 80% | 2.6 m/s | 5.9 |
| 1990 | 31.5°C | 26.9°C | 22.2°C | 35.1°C | 20.3°C | 97 mm | 69% | 2.8 m/s | 6 |
| 1989 | 32.2°C | 26.7°C | 21.2°C | 35.3°C | 15.6°C | 45 mm | 63% | 2.5 m/s | 6.9 |
| 1988 | 29.5°C | 24.8°C | 20.1°C | 34.4°C | 14.8°C | 81 mm | 68% | 2.7 m/s | 6 |
| 1987 | 29.1°C | 25.0°C | 21.0°C | 31.3°C | 15.1°C | 100 mm | 72% | 2.8 m/s | 6.2 |
| 1986 | 30.6°C | 25.6°C | 20.7°C | 33.5°C | 17.7°C | 55 mm | 65% | 2.9 m/s | 6.6 |
| 1985 | 31.3°C | 26.1°C | 20.9°C | 35.4°C | 18.5°C | 56 mm | 64% | 2.4 m/s | 6.5 |
| 1984 | 29.1°C | 25.0°C | 21.0°C | 33.2°C | 16.0°C | 166 mm | 73% | 2.8 m/s | 5.6 |
| 1983 | 28.7°C | 24.1°C | 19.6°C | 32.7°C | 14.1°C | 58 mm | 73% | 2.7 m/s | — |
| 1982 | 27.8°C | 24.1°C | 20.3°C | 30.9°C | 16.7°C | 205 mm | 75% | 2.7 m/s | — |
| 1981 | 32.8°C | 26.8°C | 20.8°C | 36.0°C | 18.0°C | 74 mm | 59% | 2.9 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 30.6°C with lows near 21.4°C (mean 26°C), based on 45 years of NASA POWER data.
May averages 99 mm of rainfall in Port Saint Lucie, one of the drier months. The wettest on record was 301 mm in 2018.
The hottest May reached 38°C in 2024. The coldest dipped to 10.8°C in 1999.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average May temperatures have risen by about 2.4°C. Daytime highs moved from 29.9°C to 32.6°C and overnight lows from 20.5°C to 22.7°C over the same span.
May is one of the warmer months of the year in Port Saint Lucie and one of the drier months, so plan for around 30.6°C daytime highs and 21.4°C at night.
Not quite — May is the 8th coolest month in Port Saint Lucie, averaging 26°C.
For May in Port Saint Lucie, pack light, breathable clothing and sun protection, with typical highs of 30.6°C and lows of 21.4°C. Bring an umbrella or light rain jacket too.
Relative humidity in May averages 70% — moderately humid.
Average wind speed in May is 2.7 m/s. The windiest May on record averaged 3.5 m/s (2007).
The wettest May on record was 2018 with 301 mm. On average, May sees 99 mm.
All figures are derived from NASA POWER (Prediction Of Worldwide Energy Resources), based on MERRA-2 satellite reanalysis, covering 1981–2025.
Explore how the weather in Port Saint Lucie behaves each May, based on 45 years of NASA POWER climate data from 1981 to 2025. This page breaks down average temperatures, rainfall, humidity, wind and solar radiation for May specifically, along with year-by-year records and how the month has changed over the decades.
