May is one of the warmer months of the year in Dallas, with average highs near 26.6°C and lows around 14.3°C (mean 20.5°C). It is about average for rainfall, averaging 104 mm of rainfall and 76% relative humidity across the period.
May is one of the warmer months of the year in Dallas. Across 45 years of records, the warmest Mays in Dallas were 2012 and 2019 — when the month averaged 22.8°C — while the coldest was 1997 at 17.7°C. Typical May days reach 26.6°C with nights near 14.3°C. The long-term trend is warming, about 0.4°C per decade.
May is about average for rainfall in Dallas, averaging 104 mm of rainfall. The wettest May on record was 2003 with 285 mm, while the driest was 2007 at 22 mm.
Relative humidity in Dallas during May averages 76%. The most humid May was 2009 at 85%, and the least humid was 2007 at 56%.
May receives about 6 kWh/m²/day of solar energy in Dallas. The sunniest Mays were 2007 and 2019 at 6.8 kWh/m²/day, and the cloudiest were 1991 and 2009 at 4.8.
Average wind speed in Dallas during May is 0.1 m/s. The windiest May was 1982 at 0.2 m/s, while the calmest were 2023, 2024 and 2025, among others at 0.1 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 19.7°C | 20.0°C | 20.7°C | 21.2°C | 20.5°C | +0.8°C |
| Avg High | 26.2°C | 25.9°C | 27.1°C | 27.3°C | 26.3°C | +0.1°C |
| Avg Low | 13.3°C | 14.1°C | 14.4°C | 15.1°C | 14.7°C | +1.4°C |
| Avg Rain | 108 mm | 94 mm | 106 mm | 107 mm | 106 mm | -2 mm |
May temperatures in Dallas have risen by about 1.4°C between 1981–1985 and 2021–2025.
May has ranged from a record low of 2.8°C (2011) to a record high of 36°C (2006).
Rainfall in May is about average for rainfall, averaging 104 mm, with a wettest year of 285 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.3°C per decade while lows rose 0.5°C per decade, narrowing the gap between day and night.
One of the best times to visit Dallas
May is one of the best times to visit Dallas. Expect days averaging 26.6°C and nights around 14.3°C (mean 20.5°C) — warmer than Dallas's yearly average — with higher rainfall (104 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 | 25.9°C | 20.8°C | 15.7°C | 31.9°C | 9.1°C | 190 mm | 82% | 0.1 m/s | 5.3 |
| 2024 | 27.8°C | 22.3°C | 16.7°C | 30.6°C | 10.7°C | 129 mm | 79% | 0.1 m/s | 5.8 |
| 2023 | 25.3°C | 19.7°C | 14.1°C | 31.1°C | 5.4°C | 61 mm | 81% | 0.1 m/s | 5.6 |
| 2022 | 28.5°C | 22.0°C | 15.5°C | 33.7°C | 9.5°C | 67 mm | 74% | 0.1 m/s | 6.2 |
| 2021 | 25.6°C | 19.4°C | 13.1°C | 32.9°C | 6.5°C | 123 mm | 75% | 0.1 m/s | 6.4 |
| 2020 | 24.6°C | 19.0°C | 13.3°C | 30.4°C | 3.6°C | 64 mm | 80% | 0.1 m/s | 6.4 |
| 2019 | 28.8°C | 22.8°C | 16.7°C | 34.0°C | 8.2°C | 60 mm | 77% | 0.1 m/s | 6.8 |
| 2018 | 28.4°C | 22.7°C | 16.9°C | 32.5°C | 8.1°C | 135 mm | 79% | 0.1 m/s | 5.9 |
| 2017 | 27.1°C | 20.8°C | 14.5°C | 34.0°C | 6.7°C | 185 mm | 75% | 0.1 m/s | 6.2 |
| 2016 | 26.1°C | 20.0°C | 13.9°C | 33.3°C | 6.6°C | 69 mm | 77% | 0.1 m/s | 6.5 |
| 2015 | 27.6°C | 21.4°C | 15.3°C | 31.6°C | 6.9°C | 99 mm | 77% | 0.1 m/s | 6.6 |
| 2014 | 26.2°C | 20.3°C | 14.5°C | 30.9°C | 6.3°C | 95 mm | 80% | 0.1 m/s | 6.3 |
| 2013 | 24.5°C | 19.0°C | 13.5°C | 29.6°C | 4.4°C | 149 mm | 80% | 0.1 m/s | 5.9 |
| 2012 🔥 | 29.2°C | 22.8°C | 16.4°C | 35.5°C | 9.0°C | 90 mm | 72% | 0.1 m/s | 6.3 |
| 2011 | 27.3°C | 20.4°C | 13.5°C | 35.2°C | 2.8°C | 45 mm | 73% | 0.1 m/s | 6.7 |
| 2010 | 27.4°C | 21.8°C | 16.2°C | 32.6°C | 8.5°C | 147 mm | 81% | 0.1 m/s | 5.9 |
| 2009 | 24.7°C | 20.2°C | 15.7°C | 30.1°C | 5.6°C | 177 mm | 85% | 0.1 m/s | 4.8 |
| 2008 | 26.3°C | 20.0°C | 13.7°C | 32.3°C | 7.9°C | 96 mm | 76% | 0.1 m/s | 6.2 |
| 2007 | 30.1°C | 22.1°C | 14.1°C | 33.3°C | 6.9°C | 22 mm | 56% | 0.1 m/s | 6.8 |
| 2006 | 27.1°C | 20.7°C | 14.2°C | 36.0°C | 7.8°C | 61 mm | 73% | 0.1 m/s | 6.3 |
| 2005 | 24.7°C | 18.3°C | 11.9°C | 30.3°C | 4.9°C | 65 mm | 78% | 0.1 m/s | 6.2 |
| 2004 | 29.3°C | 22.7°C | 16.1°C | 34.5°C | 4.4°C | 94 mm | 71% | 0.1 m/s | 5.9 |
| 2003 🌧️ | 25.5°C | 20.6°C | 15.7°C | 29.3°C | 9.6°C | 285 mm | 85% | 0.1 m/s | 4.9 |
| 2002 | 27.0°C | 20.1°C | 13.3°C | 32.5°C | 3.9°C | 111 mm | 73% | 0.1 m/s | 6.2 |
| 2001 | 26.0°C | 19.9°C | 13.9°C | 30.3°C | 8.1°C | 106 mm | 77% | 0.1 m/s | 6.2 |
| 2000 | 30.0°C | 22.7°C | 15.5°C | 34.6°C | 8.7°C | 44 mm | 66% | 0.1 m/s | 6.3 |
| 1999 | 26.7°C | 20.0°C | 13.2°C | 30.1°C | 5.2°C | 93 mm | 74% | 0.1 m/s | 6.3 |
| 1998 | 28.2°C | 22.3°C | 16.4°C | 32.7°C | 7.6°C | 87 mm | 78% | 0.1 m/s | 6.7 |
| 1997 ❄️ | 23.7°C | 17.7°C | 11.7°C | 28.8°C | 5.2°C | 132 mm | 79% | 0.1 m/s | 5.9 |
| 1996 | 27.5°C | 21.5°C | 15.6°C | 34.0°C | 5.2°C | 58 mm | 79% | 0.1 m/s | 6.6 |
| 1995 | 26.9°C | 20.8°C | 14.8°C | 31.8°C | 6.1°C | 72 mm | 76% | 0.1 m/s | 6.1 |
| 1994 | 24.6°C | 18.5°C | 12.4°C | 29.7°C | 7.7°C | 78 mm | 78% | 0.1 m/s | 6.5 |
| 1993 | 24.8°C | 19.3°C | 13.8°C | 30.3°C | 6.3°C | 110 mm | 80% | 0.1 m/s | 5.8 |
| 1992 | 24.3°C | 18.4°C | 12.5°C | 29.8°C | 5.3°C | 44 mm | 77% | 0.1 m/s | 5.8 |
| 1991 | 26.9°C | 22.0°C | 17.2°C | 32.8°C | 7.8°C | 162 mm | 84% | 0.1 m/s | 4.8 |
| 1990 | 25.1°C | 19.1°C | 13.2°C | 29.5°C | 6.8°C | 106 mm | 79% | 0.1 m/s | 6 |
| 1989 | 24.0°C | 18.0°C | 12.0°C | 33.0°C | 3.7°C | 103 mm | 79% | 0.1 m/s | 5.9 |
| 1988 | 27.2°C | 19.6°C | 12.0°C | 34.2°C | 5.2°C | 47 mm | 64% | 0.1 m/s | 6.3 |
| 1987 | 26.8°C | 21.5°C | 16.1°C | 31.5°C | 11.1°C | 74 mm | 81% | 0.1 m/s | 5.6 |
| 1986 | 28.5°C | 21.5°C | 14.4°C | 33.3°C | 4.5°C | 95 mm | 65% | 0.1 m/s | 5.6 |
| 1985 | 26.3°C | 20.0°C | 13.7°C | 33.5°C | 8.1°C | 125 mm | 74% | 0.1 m/s | 5.7 |
| 1984 | 24.9°C | 18.7°C | 12.4°C | 28.9°C | 5.2°C | 157 mm | 80% | 0.1 m/s | 5.5 |
| 1983 | 24.3°C | 18.4°C | 12.5°C | 27.4°C | 6.9°C | 143 mm | 81% | 0.1 m/s | — |
| 1982 | 27.0°C | 20.9°C | 14.8°C | 30.7°C | 5.6°C | 93 mm | 78% | 0.2 m/s | — |
| 1981 | 26.5°C | 19.0°C | 11.6°C | 32.1°C | 6.3°C | 134 mm | 68% | 0.1 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 26.6°C with lows near 14.3°C (mean 20.5°C), based on 45 years of NASA POWER data.
May averages 104 mm of rainfall in Dallas, about average for rainfall. The wettest on record was 285 mm in 2003.
The hottest May reached 36°C in 2006. The coldest dipped to 2.8°C in 2011.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average May temperatures have risen by about 1.4°C. Daytime highs moved from 25.8°C to 26.6°C and overnight lows from 13°C to 15°C over the same span.
May is one of the warmer months of the year in Dallas and about average for rainfall, so plan for around 26.6°C daytime highs and 14.3°C at night.
Not quite — May is the 8th coolest month in Dallas, averaging 20.5°C.
For May in Dallas, pack light layers you can adjust through the day, with typical highs of 26.6°C and lows of 14.3°C. Bring an umbrella or light rain jacket too.
Relative humidity in May averages 76% — quite humid.
Average wind speed in May is 0.1 m/s. The windiest May on record averaged 0.2 m/s (1982).
The wettest May on record was 2003 with 285 mm. On average, May sees 104 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 Dallas 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.
