May is one of the warmer months of the year in Norman, with average highs near 26.9°C and lows around 15°C (mean 21°C). It is a relatively wet time of year, averaging 138 mm of rainfall and 72% relative humidity across the period.
May is one of the warmer months of the year in Norman. Across 45 years of records, the warmest May in Norman was 1996 — when the month averaged 25.5°C — while the coldest was 1983 at 18.3°C. Typical May days reach 26.9°C with nights near 15°C. The long-term trend is warming, about 0.2°C per decade.
May is a relatively wet time of year in Norman, averaging 138 mm of rainfall. The wettest May on record was 2015 with 416 mm, while the driest was 2004 at 22 mm.
Relative humidity in Norman during May averages 72%. The most humid May was 2007 at 83%, and the least humid was 1996 at 55%.
May receives about 6 kWh/m²/day of solar energy in Norman. The sunniest May was 2017 at 6.9 kWh/m²/day, and the cloudiest was 2015 at 4.8.
Average wind speed in Norman during May is 3.4 m/s. The windiest May was 1996 at 4.8 m/s, while the calmest were 1994 and 2023 at 2.4 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 20.4°C | 20.5°C | 21.5°C | 21.2°C | 21.0°C | +0.6°C |
| Avg High | 26.4°C | 26.4°C | 27.7°C | 27.2°C | 26.5°C | +0.1°C |
| Avg Low | 14.5°C | 14.7°C | 15.3°C | 15.2°C | 15.5°C | +1°C |
| Avg Rain | 151 mm | 139 mm | 106 mm | 152 mm | 143 mm | -8 mm |
May temperatures in Norman have risen by about 1.3°C between 1981–1985 and 2021–2025.
May has ranged from a record low of 1.3°C (2013) to a record high of 40.1°C (2000).
Rainfall in May is a relatively wet time of year, averaging 138 mm, with a wettest year of 416 mm.
One of the best times to visit Norman
May is one of the best times to visit Norman. Expect days averaging 26.9°C and nights around 15°C (mean 21°C) — warmer than Norman's yearly average — with higher rainfall (138 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 | 25.7°C | 20.0°C | 14.2°C | 32.1°C | 6.8°C | 154 mm | 77% | 2.7 m/s | 6.2 |
| 2024 | 27.8°C | 22.3°C | 16.8°C | 33.1°C | 12.2°C | 133 mm | 75% | 3 m/s | 6.1 |
| 2023 | 26.9°C | 21.6°C | 16.2°C | 32.4°C | 7.7°C | 118 mm | 75% | 2.4 m/s | 5.5 |
| 2022 | 29.1°C | 22.8°C | 16.5°C | 36.5°C | 7.2°C | 171 mm | 67% | 4.1 m/s | 6 |
| 2021 | 24.3°C | 19.4°C | 14.6°C | 29.4°C | 8.6°C | 148 mm | 80% | 3.1 m/s | 4.9 |
| 2020 | 25.3°C | 20.0°C | 14.8°C | 34.1°C | 5.1°C | 134 mm | 77% | 3.2 m/s | 6 |
| 2019 | 25.2°C | 20.1°C | 15.1°C | 29.1°C | 6.0°C | 242 mm | 83% | 3.5 m/s | 5.3 |
| 2018 | 30.0°C | 24.2°C | 18.3°C | 35.4°C | 10.9°C | 120 mm | 70% | 3.1 m/s | 6.8 |
| 2017 | 27.1°C | 20.4°C | 13.7°C | 32.8°C | 4.1°C | 112 mm | 65% | 3.3 m/s | 6.9 |
| 2016 | 24.8°C | 19.5°C | 14.3°C | 30.0°C | 5.8°C | 101 mm | 78% | 3.1 m/s | 5.9 |
| 2015 🌧️ | 24.2°C | 19.6°C | 15.0°C | 29.4°C | 8.0°C | 416 mm | 83% | 3.3 m/s | 4.8 |
| 2014 | 29.3°C | 22.2°C | 15.1°C | 36.5°C | 4.5°C | 59 mm | 56% | 3.8 m/s | 6.5 |
| 2013 | 26.0°C | 20.2°C | 14.3°C | 32.6°C | 1.3°C | 173 mm | 71% | 3.9 m/s | 5.3 |
| 2012 | 29.5°C | 23.4°C | 17.3°C | 35.3°C | 11.8°C | 75 mm | 64% | 3.7 m/s | 6.4 |
| 2011 | 28.4°C | 21.3°C | 14.3°C | 37.1°C | 3.7°C | 127 mm | 61% | 4.6 m/s | 6.3 |
| 2010 | 27.4°C | 21.1°C | 14.9°C | 33.1°C | 7.1°C | 96 mm | 69% | 3.1 m/s | 5.9 |
| 2009 | 25.0°C | 19.3°C | 13.6°C | 31.1°C | 7.4°C | 155 mm | 76% | 2.9 m/s | 5.6 |
| 2008 | 27.5°C | 21.2°C | 14.9°C | 33.3°C | 5.4°C | 119 mm | 69% | 3.8 m/s | 6.8 |
| 2007 | 24.9°C | 20.5°C | 16.1°C | 29.2°C | 9.2°C | 245 mm | 83% | 2.8 m/s | 4.9 |
| 2006 | 29.6°C | 22.8°C | 15.9°C | 37.6°C | 8.0°C | 79 mm | 61% | 3.4 m/s | 6.7 |
| 2005 | 27.6°C | 21.5°C | 15.4°C | 37.8°C | 5.3°C | 72 mm | 66% | 3 m/s | 5.4 |
| 2004 | 30.1°C | 23.2°C | 16.3°C | 36.6°C | 5.5°C | 22 mm | 63% | 4.4 m/s | 6.4 |
| 2003 | 29.4°C | 22.3°C | 15.1°C | 39.3°C | 10.2°C | 86 mm | 63% | 3.2 m/s | 6.1 |
| 2002 | 25.8°C | 19.7°C | 13.7°C | 32.4°C | 7.7°C | 73 mm | 72% | 3.7 m/s | 5.4 |
| 2001 | 26.4°C | 21.1°C | 15.7°C | 30.0°C | 6.9°C | 164 mm | 76% | 3.3 m/s | 6.2 |
| 2000 | 30.2°C | 23.2°C | 16.3°C | 40.1°C | 8.4°C | 47 mm | 62% | 3.9 m/s | 6.3 |
| 1999 | 26.1°C | 20.2°C | 14.3°C | 31.8°C | 7.2°C | 121 mm | 74% | 3.5 m/s | 6.3 |
| 1998 | 29.0°C | 22.6°C | 16.2°C | 35.9°C | 9.2°C | 38 mm | 70% | 3.1 m/s | 6.6 |
| 1997 | 25.1°C | 19.2°C | 13.2°C | 31.0°C | 5.6°C | 129 mm | 73% | 3.2 m/s | 6.6 |
| 1996 🔥 | 32.8°C | 25.5°C | 18.1°C | 38.9°C | 9.0°C | 75 mm | 55% | 4.8 m/s | 6.4 |
| 1995 | 24.4°C | 18.9°C | 13.4°C | 30.4°C | 6.2°C | 221 mm | 78% | 3.4 m/s | 5.1 |
| 1994 | 26.0°C | 20.0°C | 14.1°C | 31.2°C | 1.8°C | 135 mm | 77% | 2.4 m/s | 6.2 |
| 1993 | 23.8°C | 18.6°C | 13.5°C | 28.6°C | 8.6°C | 191 mm | 82% | 3.4 m/s | 5.2 |
| 1992 | 24.2°C | 18.9°C | 13.5°C | 30.8°C | 5.6°C | 154 mm | 77% | 2.9 m/s | 5.4 |
| 1991 | 27.7°C | 22.5°C | 17.3°C | 32.8°C | 6.1°C | 162 mm | 77% | 3.4 m/s | 5.7 |
| 1990 | 24.5°C | 18.7°C | 12.9°C | 30.1°C | 5.7°C | 166 mm | 80% | 3.8 m/s | 5.9 |
| 1989 | 26.9°C | 20.9°C | 15.0°C | 33.2°C | 7.4°C | 153 mm | 71% | 3.7 m/s | 5.9 |
| 1988 | 27.3°C | 20.9°C | 14.5°C | 31.7°C | 8.0°C | 25 mm | 62% | 3.5 m/s | 6.2 |
| 1987 | 27.1°C | 22.1°C | 17.2°C | 32.3°C | 12.1°C | 275 mm | 77% | 3 m/s | 6 |
| 1986 | 26.2°C | 20.7°C | 15.1°C | 32.2°C | 9.7°C | 182 mm | 76% | 3.4 m/s | 5.7 |
| 1985 | 25.9°C | 19.8°C | 13.8°C | 33.1°C | 8.3°C | 53 mm | 76% | 3.1 m/s | 6.3 |
| 1984 | 28.6°C | 21.4°C | 14.2°C | 34.5°C | 4.7°C | 54 mm | 63% | 3.6 m/s | 5.8 |
| 1983 ❄️ | 24.7°C | 18.3°C | 12.0°C | 31.8°C | 6.2°C | 163 mm | 70% | 3.3 m/s | — |
| 1982 | 24.8°C | 19.8°C | 14.9°C | 29.6°C | 5.3°C | 336 mm | 81% | 3.5 m/s | — |
| 1981 | 26.4°C | 20.1°C | 13.7°C | 31.7°C | 6.0°C | 121 mm | 68% | 3.8 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 26.9°C with lows near 15°C (mean 21°C), based on 45 years of NASA POWER data.
May averages 138 mm of rainfall in Norman, a relatively wet time of year. The wettest on record was 416 mm in 2015.
The hottest May reached 40.1°C in 2000. The coldest dipped to 1.3°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 26.1°C to 26.8°C and overnight lows from 13.7°C to 15.7°C over the same span.
May is one of the warmer months of the year in Norman and a relatively wet time of year, so plan for around 26.9°C daytime highs and 15°C at night.
Not quite — May is the 8th coolest month in Norman, averaging 21°C.
For May in Norman, pack light layers you can adjust through the day, with typical highs of 26.9°C and lows of 15°C. Bring an umbrella or light rain jacket too.
Relative humidity in May averages 72% — moderately humid.
Average wind speed in May is 3.4 m/s. The windiest May on record averaged 4.8 m/s (1996).
The wettest May on record was 2015 with 416 mm. On average, May sees 138 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 Norman 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.
