May is one of the warmer months of the year in Stillwater, with average highs near 26.3°C and lows around 14.6°C (mean 20.5°C). It is a relatively wet time of year, averaging 141 mm of rainfall and 73% relative humidity across the period.
May is one of the warmer months of the year in Stillwater. Across 45 years of records, the warmest May in Stillwater was 1996 — when the month averaged 25°C — while the coldest was 1983 at 17.7°C. Typical May days reach 26.3°C with nights near 14.6°C. The long-term trend is warming, about 0.2°C per decade.
May is a relatively wet time of year in Stillwater, averaging 141 mm of rainfall. The wettest May on record was 2019 with 393 mm, while the driest was 2012 at 30 mm.
Relative humidity in Stillwater during May averages 73%. The most humid May was 1993 at 84%, and the least humid was 2014 at 57%.
May receives about 6 kWh/m²/day of solar energy in Stillwater. The sunniest Mays were 2012 and 2017 at 6.8 kWh/m²/day, and the cloudiest were 1995 and 2015 at 4.9.
Average wind speed in Stillwater during May is 3.3 m/s. The windiest May was 1996 at 4.7 m/s, while the calmest were 1994 and 2023 at 2.3 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 19.9°C | 20.1°C | 20.9°C | 20.9°C | 20.4°C | +0.5°C |
| Avg High | 25.8°C | 25.9°C | 26.9°C | 26.9°C | 25.9°C | +0.1°C |
| Avg Low | 14.1°C | 14.2°C | 14.8°C | 15.0°C | 14.8°C | +0.7°C |
| Avg Rain | 148 mm | 134 mm | 125 mm | 150 mm | 151 mm | +3 mm |
May temperatures in Stillwater have risen by about 1.3°C between 1981–1985 and 2021–2025.
May has ranged from a record low of 1.2°C (2013) to a record high of 39.2°C (1996).
Rainfall in May is a relatively wet time of year, averaging 141 mm, with a wettest year of 393 mm.
One of the best times to visit Stillwater
May is one of the best times to visit Stillwater. Expect days averaging 26.3°C and nights around 14.6°C (mean 20.5°C) — warmer than Stillwater's yearly average — with higher rainfall (141 mm), so conditions are generally comfortable for sightseeing and outdoor plans.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 25.6°C | 19.8°C | 13.9°C | 32.7°C | 6.9°C | 139 mm | 75% | 2.7 m/s | 6.2 |
| 2024 | 27.7°C | 21.9°C | 16.1°C | 32.4°C | 11.2°C | 162 mm | 74% | 2.9 m/s | 6.1 |
| 2023 | 26.7°C | 21.1°C | 15.6°C | 32.9°C | 4.5°C | 131 mm | 75% | 2.3 m/s | 5.7 |
| 2022 | 27.0°C | 21.2°C | 15.4°C | 33.2°C | 6.5°C | 259 mm | 74% | 3.9 m/s | 6 |
| 2021 | 23.9°C | 19.0°C | 14.1°C | 29.2°C | 7.2°C | 134 mm | 79% | 3.2 m/s | 5 |
| 2020 | 24.5°C | 19.2°C | 13.9°C | 32.2°C | 4.6°C | 80 mm | 78% | 3.1 m/s | 6.1 |
| 2019 🌧️ | 25.1°C | 20.0°C | 14.8°C | 29.5°C | 5.5°C | 393 mm | 82% | 3.5 m/s | 5.2 |
| 2018 | 30.5°C | 24.5°C | 18.6°C | 34.8°C | 11.7°C | 95 mm | 69% | 3 m/s | 6.6 |
| 2017 | 26.0°C | 19.5°C | 13.0°C | 32.5°C | 3.7°C | 105 mm | 71% | 3.3 m/s | 6.8 |
| 2016 | 24.9°C | 19.4°C | 14.0°C | 30.3°C | 6.1°C | 99 mm | 75% | 3.1 m/s | 6 |
| 2015 | 24.3°C | 19.3°C | 14.4°C | 28.0°C | 7.4°C | 301 mm | 81% | 3.3 m/s | 4.9 |
| 2014 | 29.5°C | 22.3°C | 15.2°C | 37.0°C | 4.6°C | 57 mm | 57% | 3.9 m/s | 6.6 |
| 2013 | 25.3°C | 19.6°C | 13.9°C | 31.6°C | 1.2°C | 172 mm | 72% | 3.9 m/s | 5.4 |
| 2012 | 29.3°C | 23.2°C | 17.0°C | 35.4°C | 10.9°C | 30 mm | 65% | 3.6 m/s | 6.8 |
| 2011 | 27.4°C | 20.9°C | 14.4°C | 35.7°C | 4.0°C | 109 mm | 65% | 4.5 m/s | 6.4 |
| 2010 | 26.6°C | 20.4°C | 14.3°C | 32.2°C | 6.3°C | 137 mm | 72% | 3.1 m/s | 5.9 |
| 2009 | 24.9°C | 19.1°C | 13.3°C | 32.5°C | 6.7°C | 87 mm | 74% | 2.9 m/s | 6 |
| 2008 | 26.0°C | 20.2°C | 14.4°C | 32.1°C | 4.9°C | 173 mm | 75% | 3.6 m/s | 6.6 |
| 2007 | 24.7°C | 20.4°C | 16.0°C | 29.0°C | 9.0°C | 253 mm | 83% | 2.8 m/s | 5.1 |
| 2006 | 28.7°C | 22.1°C | 15.5°C | 37.9°C | 7.9°C | 66 mm | 63% | 3.3 m/s | 6.6 |
| 2005 | 27.5°C | 21.2°C | 14.9°C | 37.2°C | 3.6°C | 69 mm | 66% | 3 m/s | 6 |
| 2004 | 28.8°C | 22.3°C | 15.8°C | 33.6°C | 3.6°C | 45 mm | 68% | 4.2 m/s | 6.7 |
| 2003 | 28.3°C | 21.4°C | 14.4°C | 36.5°C | 8.8°C | 102 mm | 65% | 3.1 m/s | 6.1 |
| 2002 | 25.4°C | 19.3°C | 13.2°C | 31.9°C | 7.3°C | 111 mm | 73% | 3.6 m/s | 5.6 |
| 2001 | 26.7°C | 21.1°C | 15.5°C | 31.5°C | 7.1°C | 207 mm | 72% | 3.4 m/s | 6.2 |
| 2000 | 28.2°C | 21.8°C | 15.4°C | 37.8°C | 8.0°C | 136 mm | 69% | 3.7 m/s | 6.3 |
| 1999 | 25.2°C | 19.3°C | 13.4°C | 29.9°C | 6.2°C | 168 mm | 77% | 3.4 m/s | 6.4 |
| 1998 | 27.8°C | 21.6°C | 15.5°C | 33.8°C | 6.9°C | 77 mm | 77% | 2.9 m/s | 6.7 |
| 1997 | 25.4°C | 19.0°C | 12.6°C | 31.9°C | 5.4°C | 74 mm | 70% | 3.2 m/s | 6.7 |
| 1996 🔥 | 32.2°C | 25.0°C | 17.8°C | 39.2°C | 8.6°C | 72 mm | 57% | 4.7 m/s | 6.2 |
| 1995 | 23.6°C | 18.2°C | 12.8°C | 29.5°C | 4.3°C | 216 mm | 80% | 3.2 m/s | 4.9 |
| 1994 | 25.7°C | 19.7°C | 13.6°C | 31.3°C | 2.0°C | 102 mm | 76% | 2.3 m/s | 6.4 |
| 1993 | 23.2°C | 18.2°C | 13.2°C | 28.0°C | 8.1°C | 233 mm | 84% | 3.2 m/s | 5.2 |
| 1992 | 23.9°C | 18.5°C | 13.0°C | 30.1°C | 5.0°C | 120 mm | 76% | 2.9 m/s | 5.5 |
| 1991 | 28.0°C | 22.7°C | 17.3°C | 32.8°C | 5.8°C | 148 mm | 76% | 3.4 m/s | 5.7 |
| 1990 | 24.2°C | 18.5°C | 12.8°C | 29.6°C | 5.2°C | 132 mm | 80% | 3.7 m/s | 5.7 |
| 1989 | 26.0°C | 20.2°C | 14.4°C | 32.4°C | 6.2°C | 154 mm | 72% | 3.6 m/s | 5.9 |
| 1988 | 26.5°C | 20.2°C | 13.8°C | 30.3°C | 7.9°C | 49 mm | 67% | 3.4 m/s | 6.3 |
| 1987 | 26.9°C | 21.9°C | 17.0°C | 31.9°C | 10.7°C | 195 mm | 80% | 3.1 m/s | 5.9 |
| 1986 | 25.7°C | 20.3°C | 14.8°C | 30.9°C | 8.9°C | 160 mm | 77% | 3.3 m/s | 6 |
| 1985 | 25.4°C | 19.6°C | 13.8°C | 34.6°C | 8.1°C | 72 mm | 78% | 3.1 m/s | 6.4 |
| 1984 | 26.3°C | 19.8°C | 13.3°C | 33.1°C | 3.6°C | 91 mm | 71% | 3.3 m/s | 5.7 |
| 1983 ❄️ | 23.9°C | 17.7°C | 11.6°C | 29.8°C | 6.5°C | 184 mm | 72% | 3.2 m/s | — |
| 1982 | 25.0°C | 19.8°C | 14.7°C | 30.2°C | 5.2°C | 291 mm | 79% | 3.4 m/s | — |
| 1981 | 26.2°C | 19.7°C | 13.3°C | 32.8°C | 4.3°C | 133 mm | 66% | 3.7 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 26.3°C with lows near 14.6°C (mean 20.5°C), based on 45 years of NASA POWER data.
May averages 141 mm of rainfall in Stillwater, a relatively wet time of year. The wettest on record was 393 mm in 2019.
The hottest May reached 39.2°C in 1996. The coldest dipped to 1.2°C in 2013.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average May temperatures have risen by about 1.3°C. Daytime highs moved from 25.4°C to 26.2°C and overnight lows from 13.3°C to 15°C over the same span.
May is one of the warmer months of the year in Stillwater and a relatively wet time of year, so plan for around 26.3°C daytime highs and 14.6°C at night.
Not quite — May is the 8th coolest month in Stillwater, averaging 20.5°C.
For May in Stillwater, pack light layers you can adjust through the day, with typical highs of 26.3°C and lows of 14.6°C. Bring an umbrella or light rain jacket too.
Relative humidity in May averages 73% — moderately humid.
Average wind speed in May is 3.3 m/s. The windiest May on record averaged 4.7 m/s (1996).
The wettest May on record was 2019 with 393 mm. On average, May sees 141 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 Stillwater 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.
