May is one of the warmer months of the year in Baytown, with average highs near 29.9°C and lows around 19.8°C (mean 24.9°C). It is a relatively wet time of year, averaging 137 mm of rainfall and 77% relative humidity across the period.
May is one of the warmer months of the year in Baytown. Across 45 years of records, the warmest Mays in Baytown were 1998 and 2022 — when the month averaged 27.6°C — while the coldest was 1993 at 22.1°C. Typical May days reach 29.9°C with nights near 19.8°C. The long-term trend is warming, about 0.4°C per decade.
May is a relatively wet time of year in Baytown, averaging 137 mm of rainfall. The wettest May on record was 2024 with 319 mm, while the driest was 1998 at 1 mm.
Relative humidity in Baytown during May averages 77%. The most humid May was 1991 at 87%, and the least humid was 2011 at 63%.
May receives about 6.1 kWh/m²/day of solar energy in Baytown. The sunniest May was 2018 at 7 kWh/m²/day, and the cloudiest was 2024 at 5.1.
Average wind speed in Baytown during May is 1.8 m/s. The windiest May was 2011 at 2.5 m/s, while the calmest was 2023 at 1.3 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 24.2°C | 24.5°C | 25.1°C | 25.2°C | 25.6°C | +1.4°C |
| Avg High | 29.4°C | 29.3°C | 30.3°C | 30.4°C | 30.4°C | +1°C |
| Avg Low | 19.0°C | 19.7°C | 19.9°C | 19.9°C | 20.7°C | +1.7°C |
| Avg Rain | 146 mm | 133 mm | 104 mm | 139 mm | 181 mm | +35 mm |
May temperatures in Baytown have risen by about 1.8°C between 1981–1985 and 2021–2025.
May has ranged from a record low of 6.9°C (2013) to a record high of 39.9°C (1998).
Rainfall in May is a relatively wet time of year, averaging 137 mm, with a wettest year of 319 mm.
One of the best times to visit Baytown
May is one of the best times to visit Baytown. Expect days averaging 29.9°C and nights around 19.8°C (mean 24.9°C) — warmer than Baytown's yearly average — with higher rainfall (137 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 | 30.6°C | 25.6°C | 20.6°C | 35.6°C | 12.8°C | 158 mm | 78% | 1.8 m/s | 5.9 |
| 2024 🌧️ | 29.8°C | 26.0°C | 22.2°C | 35.7°C | 19.0°C | 319 mm | 87% | 1.7 m/s | 5.1 |
| 2023 | 29.6°C | 24.9°C | 20.2°C | 32.4°C | 13.3°C | 139 mm | 80% | 1.3 m/s | 5.8 |
| 2022 | 33.5°C | 27.6°C | 21.8°C | 37.3°C | 16.2°C | 89 mm | 72% | 2 m/s | 6.7 |
| 2021 | 28.5°C | 24.4°C | 20.2°C | 32.2°C | 14.9°C | 253 mm | 83% | 2 m/s | 5.3 |
| 2020 | 30.5°C | 24.9°C | 19.4°C | 34.9°C | 13.0°C | 127 mm | 75% | 1.8 m/s | 6.3 |
| 2019 | 29.8°C | 25.5°C | 21.2°C | 34.7°C | 14.4°C | 192 mm | 81% | 2.1 m/s | 5.9 |
| 2018 | 33.6°C | 27.2°C | 20.9°C | 36.9°C | 15.4°C | 54 mm | 69% | 1.6 m/s | 7 |
| 2017 | 30.0°C | 24.3°C | 18.6°C | 32.8°C | 11.3°C | 137 mm | 73% | 1.9 m/s | 6.5 |
| 2016 | 28.0°C | 23.9°C | 19.8°C | 31.6°C | 11.8°C | 239 mm | 85% | 1.6 m/s | 5.6 |
| 2015 | 27.8°C | 24.4°C | 21.0°C | 30.3°C | 12.7°C | 303 mm | 87% | 1.8 m/s | 5.4 |
| 2014 | 29.3°C | 23.7°C | 18.1°C | 32.6°C | 10.2°C | 197 mm | 72% | 2.1 m/s | 6.2 |
| 2013 | 29.1°C | 23.7°C | 18.4°C | 34.4°C | 6.9°C | 89 mm | 74% | 2.1 m/s | 6.3 |
| 2012 | 31.1°C | 25.7°C | 20.2°C | 35.8°C | 16.0°C | 80 mm | 74% | 1.6 m/s | 6.7 |
| 2011 | 32.6°C | 26.3°C | 20.1°C | 37.1°C | 9.5°C | 24 mm | 63% | 2.5 m/s | 6.7 |
| 2010 | 32.7°C | 26.9°C | 21.0°C | 37.4°C | 14.5°C | 80 mm | 70% | 1.8 m/s | 6.5 |
| 2009 | 29.8°C | 24.7°C | 19.6°C | 34.2°C | 11.9°C | 41 mm | 78% | 1.6 m/s | 6.3 |
| 2008 | 31.1°C | 25.5°C | 20.0°C | 35.6°C | 12.9°C | 87 mm | 72% | 2 m/s | 6.1 |
| 2007 | 27.6°C | 23.6°C | 19.5°C | 30.6°C | 13.5°C | 159 mm | 83% | 1.6 m/s | 6.2 |
| 2006 | 31.0°C | 25.3°C | 19.6°C | 34.6°C | 12.3°C | 117 mm | 72% | 1.8 m/s | 6.3 |
| 2005 | 30.7°C | 24.6°C | 18.4°C | 38.2°C | 9.3°C | 89 mm | 71% | 1.4 m/s | 6.8 |
| 2004 | 28.4°C | 23.9°C | 19.4°C | 35.5°C | 10.4°C | 179 mm | 82% | 1.9 m/s | 6.2 |
| 2003 | 32.8°C | 27.0°C | 21.3°C | 37.4°C | 16.3°C | 8 mm | 71% | 1.9 m/s | 6 |
| 2002 | 31.4°C | 25.7°C | 20.1°C | 34.6°C | 10.9°C | 69 mm | 70% | 2.1 m/s | 6.5 |
| 2001 | 30.3°C | 25.0°C | 19.8°C | 33.7°C | 13.8°C | 97 mm | 76% | 1.8 m/s | 6.7 |
| 2000 | 29.8°C | 25.6°C | 21.4°C | 34.2°C | 14.9°C | 195 mm | 81% | 1.9 m/s | 6.3 |
| 1999 | 30.6°C | 25.3°C | 20.0°C | 34.6°C | 13.0°C | 142 mm | 75% | 1.7 m/s | 6.1 |
| 1998 🔥 | 34.6°C | 27.6°C | 20.5°C | 39.9°C | 15.3°C | 1 mm | 67% | 1.9 m/s | 6.5 |
| 1997 | 27.4°C | 23.0°C | 18.5°C | 31.1°C | 11.6°C | 154 mm | 85% | 1.5 m/s | 6 |
| 1996 | 32.6°C | 27.0°C | 21.5°C | 37.1°C | 12.7°C | 27 mm | 71% | 2.3 m/s | 6.6 |
| 1995 | 29.6°C | 24.8°C | 19.9°C | 32.4°C | 12.1°C | 194 mm | 81% | 1.9 m/s | 5.9 |
| 1994 | 28.6°C | 23.9°C | 19.2°C | 32.4°C | 12.8°C | 166 mm | 81% | 1.4 m/s | 6.3 |
| 1993 ❄️ | 26.7°C | 22.1°C | 17.5°C | 30.8°C | 9.8°C | 177 mm | 84% | 1.7 m/s | 5.8 |
| 1992 | 26.7°C | 22.4°C | 18.1°C | 30.5°C | 7.9°C | 157 mm | 83% | 1.4 m/s | 5.9 |
| 1991 | 28.1°C | 24.5°C | 20.9°C | 33.1°C | 11.8°C | 186 mm | 87% | 1.7 m/s | 5.2 |
| 1990 | 28.4°C | 24.4°C | 20.5°C | 31.7°C | 12.8°C | 125 mm | 84% | 2 m/s | 5.6 |
| 1989 | 30.3°C | 25.4°C | 20.5°C | 33.2°C | 14.8°C | 234 mm | 79% | 1.9 m/s | 6.1 |
| 1988 | 30.9°C | 24.1°C | 17.3°C | 34.1°C | 11.7°C | 22 mm | 66% | 1.7 m/s | 6.6 |
| 1987 | 28.6°C | 24.5°C | 20.4°C | 32.2°C | 17.7°C | 157 mm | 82% | 1.4 m/s | 5.5 |
| 1986 | 28.8°C | 23.8°C | 18.9°C | 33.1°C | 12.3°C | 161 mm | 79% | 1.8 m/s | 5.8 |
| 1985 | 30.6°C | 24.9°C | 19.3°C | 37.0°C | 12.6°C | 62 mm | 73% | 1.6 m/s | 6.1 |
| 1984 | 29.9°C | 24.4°C | 18.8°C | 35.0°C | 9.9°C | 137 mm | 73% | 2 m/s | 5.9 |
| 1983 | 28.6°C | 23.4°C | 18.3°C | 31.3°C | 11.7°C | 217 mm | 79% | 1.9 m/s | — |
| 1982 | 27.9°C | 23.6°C | 19.3°C | 32.6°C | 10.2°C | 156 mm | 83% | 1.7 m/s | — |
| 1981 | 28.8°C | 23.4°C | 18.1°C | 34.3°C | 8.1°C | 167 mm | 76% | 1.8 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 29.9°C with lows near 19.8°C (mean 24.9°C), based on 45 years of NASA POWER data.
May averages 137 mm of rainfall in Baytown, a relatively wet time of year. The wettest on record was 319 mm in 2024.
The hottest May reached 39.9°C in 1998. The coldest dipped to 6.9°C in 2013.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average May temperatures have risen by about 1.8°C. Daytime highs moved from 29.2°C to 30.4°C and overnight lows from 18.8°C to 21°C over the same span.
May is one of the warmer months of the year in Baytown and a relatively wet time of year, so plan for around 29.9°C daytime highs and 19.8°C at night.
Not quite — May is the 8th coolest month in Baytown, averaging 24.9°C.
For May in Baytown, pack light layers you can adjust through the day, with typical highs of 29.9°C and lows of 19.8°C. Bring an umbrella or light rain jacket too.
Relative humidity in May averages 77% — quite humid.
Average wind speed in May is 1.8 m/s. The windiest May on record averaged 2.5 m/s (2011).
The wettest May on record was 2024 with 319 mm. On average, May sees 137 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 Baytown 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.
