May is one of the warmer months of the year in Waco, with average highs near 29.3°C and lows around 17.9°C (mean 23.6°C). It is a relatively wet time of year, averaging 125 mm of rainfall and 74% relative humidity across the period.
May is one of the warmer months of the year in Waco. Across 45 years of records, the warmest May in Waco was 1996 — when the month averaged 28°C — while the coldest was 1992 at 21°C. Typical May days reach 29.3°C with nights near 17.9°C. The long-term trend is warming, about 0.2°C per decade.
May is a relatively wet time of year in Waco, averaging 125 mm of rainfall. The wettest May on record was 2024 with 327 mm, while the driest was 1998 at 13 mm.
Relative humidity in Waco during May averages 74%. The most humid May was 2015 at 86%, and the least humid was 1984 at 56%.
May receives about 5.8 kWh/m²/day of solar energy in Waco. The sunniest May was 1998 at 6.8 kWh/m²/day, and the cloudiest was 2015 at 4.6.
Average wind speed in Waco during May is 2.9 m/s. The windiest May was 1996 at 4.4 m/s, while the calmest was 2023 at 1.9 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 23.2°C | 23.3°C | 23.8°C | 23.6°C | 24.3°C | +1.1°C |
| Avg High | 29.3°C | 28.9°C | 29.5°C | 29.3°C | 29.7°C | +0.4°C |
| Avg Low | 17.2°C | 17.7°C | 18.2°C | 17.9°C | 18.8°C | +1.6°C |
| Avg Rain | 130 mm | 117 mm | 105 mm | 123 mm | 167 mm | +37 mm |
May temperatures in Waco have risen by about 1.3°C between 1981–1985 and 2021–2025.
May has ranged from a record low of 5.1°C (2013) to a record high of 40.2°C (1984).
Rainfall in May is a relatively wet time of year, averaging 125 mm, with a wettest year of 327 mm.
One of the best times to visit Waco
May is one of the best times to visit Waco. Expect days averaging 29.3°C and nights around 17.9°C (mean 23.6°C) — warmer than Waco's yearly average — with higher rainfall (125 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 | 30.5°C | 24.6°C | 18.7°C | 36.6°C | 10.9°C | 160 mm | 73% | 2.7 m/s | 5.9 |
| 2024 🌧️ | 29.1°C | 24.8°C | 20.5°C | 32.9°C | 16.3°C | 327 mm | 86% | 2.5 m/s | 5 |
| 2023 | 28.1°C | 23.3°C | 18.4°C | 31.9°C | 12.0°C | 128 mm | 79% | 1.9 m/s | 5.6 |
| 2022 | 33.9°C | 26.9°C | 19.9°C | 38.2°C | 12.3°C | 75 mm | 64% | 3.5 m/s | 6.6 |
| 2021 | 27.9°C | 23.0°C | 18.1°C | 32.7°C | 11.4°C | 209 mm | 81% | 3 m/s | 4.8 |
| 2020 | 28.8°C | 23.0°C | 17.2°C | 33.8°C | 10.0°C | 105 mm | 74% | 2.9 m/s | 6.5 |
| 2019 | 27.5°C | 22.9°C | 18.4°C | 30.9°C | 10.9°C | 166 mm | 84% | 2.9 m/s | 5.3 |
| 2018 | 33.0°C | 26.4°C | 19.8°C | 38.2°C | 13.6°C | 66 mm | 65% | 2.6 m/s | 6.6 |
| 2017 | 29.2°C | 22.7°C | 16.3°C | 33.3°C | 8.4°C | 90 mm | 70% | 3 m/s | 5.9 |
| 2016 | 26.7°C | 22.0°C | 17.3°C | 31.0°C | 8.8°C | 181 mm | 83% | 2.7 m/s | 5.3 |
| 2015 | 27.0°C | 23.1°C | 19.1°C | 30.1°C | 12.3°C | 270 mm | 86% | 3 m/s | 4.6 |
| 2014 | 28.7°C | 22.4°C | 16.2°C | 33.4°C | 7.4°C | 172 mm | 70% | 3.2 m/s | 6.2 |
| 2013 | 29.1°C | 22.9°C | 16.8°C | 35.5°C | 5.1°C | 100 mm | 68% | 3.4 m/s | 5.7 |
| 2012 | 30.3°C | 24.6°C | 18.9°C | 35.6°C | 13.9°C | 78 mm | 72% | 2.7 m/s | 6.3 |
| 2011 | 31.6°C | 24.7°C | 17.7°C | 38.7°C | 7.4°C | 68 mm | 61% | 4 m/s | 6.2 |
| 2010 | 30.1°C | 24.5°C | 18.8°C | 35.4°C | 10.9°C | 42 mm | 71% | 2.7 m/s | 6.1 |
| 2009 | 29.0°C | 23.5°C | 17.9°C | 33.5°C | 10.2°C | 52 mm | 74% | 2.5 m/s | 6 |
| 2008 | 29.6°C | 23.7°C | 17.8°C | 34.6°C | 10.1°C | 114 mm | 71% | 3 m/s | 6.3 |
| 2007 | 26.5°C | 22.4°C | 18.4°C | 29.6°C | 11.9°C | 264 mm | 84% | 2.4 m/s | 4.9 |
| 2006 | 30.7°C | 24.3°C | 17.9°C | 35.4°C | 11.2°C | 75 mm | 68% | 3 m/s | 6.7 |
| 2005 | 28.8°C | 22.9°C | 16.9°C | 36.9°C | 6.9°C | 104 mm | 73% | 2.4 m/s | 5.7 |
| 2004 | 28.5°C | 23.2°C | 18.0°C | 34.6°C | 7.6°C | 83 mm | 79% | 3.3 m/s | 5.7 |
| 2003 | 31.6°C | 25.5°C | 19.4°C | 39.0°C | 14.8°C | 51 mm | 70% | 3 m/s | 5.3 |
| 2002 | 31.1°C | 24.5°C | 17.9°C | 36.7°C | 9.6°C | 81 mm | 65% | 3.5 m/s | 6.1 |
| 2001 | 28.4°C | 23.2°C | 17.9°C | 32.1°C | 10.5°C | 104 mm | 78% | 2.9 m/s | 6.3 |
| 2000 | 30.7°C | 25.1°C | 19.5°C | 36.6°C | 11.9°C | 124 mm | 73% | 3.5 m/s | 6.4 |
| 1999 | 29.2°C | 23.4°C | 17.7°C | 32.2°C | 10.9°C | 106 mm | 74% | 2.7 m/s | 5.8 |
| 1998 | 34.1°C | 26.5°C | 18.8°C | 40.0°C | 12.7°C | 13 mm | 61% | 3 m/s | 6.8 |
| 1997 | 26.7°C | 21.5°C | 16.4°C | 31.6°C | 9.5°C | 97 mm | 81% | 2.5 m/s | 5.7 |
| 1996 🔥 | 35.1°C | 28.0°C | 20.9°C | 39.7°C | 10.8°C | 49 mm | 59% | 4.4 m/s | 6.3 |
| 1995 | 27.9°C | 22.7°C | 17.5°C | 32.9°C | 9.1°C | 154 mm | 80% | 3 m/s | 5.7 |
| 1994 | 27.9°C | 22.7°C | 17.5°C | 32.9°C | 8.0°C | 183 mm | 79% | 2.2 m/s | 5.6 |
| 1993 | 26.5°C | 21.1°C | 15.6°C | 29.4°C | 8.3°C | 106 mm | 81% | 3 m/s | 6 |
| 1992 ❄️ | 25.6°C | 21.0°C | 16.3°C | 31.1°C | 8.6°C | 184 mm | 83% | 2.5 m/s | 5.2 |
| 1991 | 27.9°C | 23.5°C | 19.1°C | 32.0°C | 8.6°C | 135 mm | 84% | 2.6 m/s | 5.2 |
| 1990 | 28.4°C | 23.0°C | 17.5°C | 33.4°C | 10.0°C | 143 mm | 79% | 3.4 m/s | 6.3 |
| 1989 | 29.6°C | 24.0°C | 18.5°C | 34.9°C | 13.0°C | 202 mm | 76% | 3.3 m/s | 6 |
| 1988 | 30.8°C | 23.2°C | 15.7°C | 35.2°C | 10.5°C | 83 mm | 60% | 2.8 m/s | 6.5 |
| 1987 | 28.4°C | 23.6°C | 18.9°C | 32.9°C | 14.9°C | 158 mm | 79% | 2.4 m/s | 5 |
| 1986 | 27.2°C | 22.1°C | 17.0°C | 30.6°C | 10.7°C | 152 mm | 80% | 2.9 m/s | 5 |
| 1985 | 28.8°C | 22.9°C | 17.0°C | 37.5°C | 11.5°C | 74 mm | 74% | 2.7 m/s | 6.3 |
| 1984 | 32.8°C | 25.3°C | 17.7°C | 40.2°C | 10.8°C | 66 mm | 56% | 3.6 m/s | 6.2 |
| 1983 | 28.4°C | 22.1°C | 15.7°C | 34.8°C | 9.7°C | 181 mm | 74% | 3 m/s | — |
| 1982 | 28.2°C | 22.8°C | 17.4°C | 33.8°C | 8.6°C | 127 mm | 78% | 3.1 m/s | — |
| 1981 | 29.1°C | 22.9°C | 16.7°C | 34.0°C | 8.9°C | 129 mm | 70% | 3.2 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 29.3°C with lows near 17.9°C (mean 23.6°C), based on 45 years of NASA POWER data.
May averages 125 mm of rainfall in Waco, a relatively wet time of year. The wettest on record was 327 mm in 2024.
The hottest May reached 40.2°C in 1984. The coldest dipped to 5.1°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 29.5°C to 29.9°C and overnight lows from 16.9°C to 19.1°C over the same span.
May is one of the warmer months of the year in Waco and a relatively wet time of year, so plan for around 29.3°C daytime highs and 17.9°C at night.
Not quite — May is the 8th coolest month in Waco, averaging 23.6°C.
For May in Waco, pack light layers you can adjust through the day, with typical highs of 29.3°C and lows of 17.9°C. Bring an umbrella or light rain jacket too.
Relative humidity in May averages 74% — moderately humid.
Average wind speed in May is 2.9 m/s. The windiest May on record averaged 4.4 m/s (1996).
The wettest May on record was 2024 with 327 mm. On average, May sees 125 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 Waco 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.
