May is one of the warmer months of the year in Killeen, with average highs near 30.1°C and lows around 18.1°C (mean 24.1°C). It is a relatively wet time of year, averaging 118 mm of rainfall and 71% relative humidity across the period.
May is one of the warmer months of the year in Killeen. Across 45 years of records, the warmest May in Killeen was 1996 — when the month averaged 27.8°C — while the coldest was 1992 at 21°C. Typical May days reach 30.1°C with nights near 18.1°C. The long-term trend is warming, about 0.2°C per decade.
May is a relatively wet time of year in Killeen, averaging 118 mm of rainfall. The wettest May on record was 2015 with 283 mm, while the driest was 1998 at 21 mm.
Relative humidity in Killeen during May averages 71%. The most humid May was 2015 at 84%, and the least humid was 1984 at 53%.
May receives about 5.8 kWh/m²/day of solar energy in Killeen. The sunniest May was 1998 at 6.8 kWh/m²/day, and the cloudiest was 2015 at 4.6.
Average wind speed in Killeen during May is 3 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 | 23.6°C | 23.9°C | 24.4°C | 24.0°C | 24.8°C | +1.2°C |
| Avg High | 29.9°C | 29.8°C | 30.5°C | 29.9°C | 30.7°C | +0.8°C |
| Avg Low | 17.3°C | 17.9°C | 18.3°C | 18.1°C | 19.0°C | +1.7°C |
| Avg Rain | 119 mm | 120 mm | 92 mm | 124 mm | 143 mm | +24 mm |
May temperatures in Killeen have risen by about 1.5°C between 1981–1985 and 2021–2025.
May has ranged from a record low of 5.8°C (2013) to a record high of 41.4°C (1984).
Rainfall in May is a relatively wet time of year, averaging 118 mm, with a wettest year of 283 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.2°C per decade while lows rose 0.4°C per decade, narrowing the gap between day and night.
One of the best times to visit Killeen
May is one of the best times to visit Killeen. Expect days averaging 30.1°C and nights around 18.1°C (mean 24.1°C) — warmer than Killeen's yearly average — with higher rainfall (118 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 | 31.8°C | 25.4°C | 19.0°C | 39.4°C | 11.8°C | 146 mm | 70% | 2.8 m/s | 5.9 |
| 2024 | 30.6°C | 25.6°C | 20.7°C | 35.3°C | 16.4°C | 237 mm | 81% | 2.6 m/s | 5 |
| 2023 | 28.9°C | 23.6°C | 18.4°C | 33.8°C | 12.2°C | 114 mm | 77% | 1.9 m/s | 5.6 |
| 2022 | 35.0°C | 27.7°C | 20.4°C | 39.2°C | 12.6°C | 67 mm | 61% | 3.7 m/s | 6.6 |
| 2021 | 28.1°C | 23.1°C | 18.1°C | 33.1°C | 11.6°C | 189 mm | 80% | 3 m/s | 4.8 |
| 2020 | 29.8°C | 23.6°C | 17.5°C | 35.4°C | 10.8°C | 107 mm | 71% | 3 m/s | 6.5 |
| 2019 | 28.2°C | 23.3°C | 18.5°C | 32.6°C | 10.8°C | 149 mm | 81% | 3.1 m/s | 5.3 |
| 2018 | 33.1°C | 26.4°C | 19.7°C | 39.1°C | 13.9°C | 87 mm | 66% | 2.8 m/s | 6.6 |
| 2017 | 30.2°C | 23.5°C | 16.9°C | 34.8°C | 9.4°C | 91 mm | 67% | 3.2 m/s | 5.9 |
| 2016 | 27.1°C | 22.2°C | 17.3°C | 31.2°C | 8.8°C | 179 mm | 82% | 2.7 m/s | 5.3 |
| 2015 🌧️ | 27.6°C | 23.4°C | 19.2°C | 30.0°C | 11.8°C | 283 mm | 84% | 3.1 m/s | 4.6 |
| 2014 | 29.6°C | 23.1°C | 16.6°C | 35.1°C | 8.2°C | 168 mm | 66% | 3.5 m/s | 6.2 |
| 2013 | 29.3°C | 23.2°C | 17.0°C | 34.9°C | 5.8°C | 105 mm | 68% | 3.5 m/s | 5.7 |
| 2012 | 31.4°C | 25.2°C | 19.0°C | 36.9°C | 13.6°C | 82 mm | 69% | 2.9 m/s | 6.3 |
| 2011 | 31.9°C | 24.8°C | 17.7°C | 39.6°C | 6.8°C | 66 mm | 61% | 3.9 m/s | 6.2 |
| 2010 | 30.8°C | 24.9°C | 19.0°C | 36.2°C | 11.6°C | 32 mm | 68% | 2.9 m/s | 6.1 |
| 2009 | 30.1°C | 24.1°C | 18.1°C | 35.3°C | 10.1°C | 58 mm | 70% | 2.6 m/s | 6 |
| 2008 | 30.6°C | 24.4°C | 18.1°C | 36.1°C | 10.5°C | 115 mm | 68% | 3.1 m/s | 6.3 |
| 2007 | 27.0°C | 22.6°C | 18.2°C | 30.7°C | 12.0°C | 223 mm | 81% | 2.5 m/s | 4.9 |
| 2006 | 31.0°C | 24.6°C | 18.1°C | 36.2°C | 11.4°C | 85 mm | 67% | 3.1 m/s | 6.7 |
| 2005 | 28.8°C | 22.9°C | 17.0°C | 37.0°C | 7.1°C | 106 mm | 73% | 2.5 m/s | 5.7 |
| 2004 | 30.3°C | 24.2°C | 18.2°C | 39.4°C | 8.3°C | 48 mm | 72% | 3.5 m/s | 5.7 |
| 2003 | 33.2°C | 26.5°C | 19.7°C | 38.7°C | 15.1°C | 39 mm | 65% | 3.1 m/s | 5.3 |
| 2002 | 32.6°C | 25.5°C | 18.4°C | 38.8°C | 10.1°C | 57 mm | 60% | 3.7 m/s | 6.1 |
| 2001 | 29.3°C | 23.7°C | 18.1°C | 34.0°C | 10.8°C | 99 mm | 75% | 3 m/s | 6.3 |
| 2000 | 31.9°C | 25.7°C | 19.5°C | 38.6°C | 11.6°C | 88 mm | 70% | 3.6 m/s | 6.4 |
| 1999 | 30.2°C | 24.1°C | 18.0°C | 35.1°C | 11.6°C | 122 mm | 71% | 2.7 m/s | 5.8 |
| 1998 | 35.5°C | 27.3°C | 19.0°C | 40.2°C | 13.1°C | 21 mm | 57% | 3.2 m/s | 6.8 |
| 1997 | 27.2°C | 21.7°C | 16.3°C | 32.0°C | 9.3°C | 120 mm | 80% | 2.5 m/s | 5.7 |
| 1996 🔥 | 34.8°C | 27.8°C | 20.7°C | 39.6°C | 10.3°C | 60 mm | 61% | 4.4 m/s | 6.3 |
| 1995 | 29.9°C | 23.9°C | 17.8°C | 35.3°C | 9.6°C | 160 mm | 72% | 3.1 m/s | 5.7 |
| 1994 | 28.7°C | 23.2°C | 17.7°C | 34.0°C | 8.3°C | 160 mm | 78% | 2.2 m/s | 5.6 |
| 1993 | 27.4°C | 21.6°C | 15.8°C | 31.5°C | 8.3°C | 98 mm | 77% | 3.1 m/s | 6 |
| 1992 ❄️ | 25.7°C | 21.0°C | 16.3°C | 32.2°C | 8.3°C | 204 mm | 83% | 2.6 m/s | 5.2 |
| 1991 | 28.8°C | 23.9°C | 19.0°C | 33.8°C | 8.5°C | 138 mm | 81% | 2.7 m/s | 5.2 |
| 1990 | 30.3°C | 24.1°C | 18.0°C | 36.1°C | 10.5°C | 118 mm | 72% | 3.5 m/s | 6.3 |
| 1989 | 31.0°C | 24.8°C | 18.5°C | 36.5°C | 13.7°C | 152 mm | 72% | 3.4 m/s | 6 |
| 1988 | 31.1°C | 23.4°C | 15.8°C | 36.8°C | 10.5°C | 87 mm | 60% | 2.9 m/s | 6.5 |
| 1987 | 28.4°C | 23.6°C | 18.8°C | 33.8°C | 14.7°C | 158 mm | 79% | 2.5 m/s | 5 |
| 1986 | 28.0°C | 22.6°C | 17.3°C | 31.7°C | 11.2°C | 146 mm | 77% | 3 m/s | 5 |
| 1985 | 29.7°C | 23.5°C | 17.3°C | 38.8°C | 12.4°C | 79 mm | 71% | 2.7 m/s | 6.3 |
| 1984 | 33.4°C | 25.7°C | 17.9°C | 41.4°C | 10.7°C | 47 mm | 53% | 3.6 m/s | 6.2 |
| 1983 | 29.1°C | 22.6°C | 16.0°C | 36.6°C | 9.7°C | 161 mm | 71% | 3.1 m/s | — |
| 1982 | 28.7°C | 23.0°C | 17.3°C | 34.2°C | 8.6°C | 129 mm | 76% | 3.1 m/s | — |
| 1981 | 29.7°C | 23.4°C | 17.0°C | 34.2°C | 10.4°C | 110 mm | 69% | 3.3 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 30.1°C with lows near 18.1°C (mean 24.1°C), based on 45 years of NASA POWER data.
May averages 118 mm of rainfall in Killeen, a relatively wet time of year. The wettest on record was 283 mm in 2015.
The hottest May reached 41.4°C in 1984. The coldest dipped to 5.8°C in 2013.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average May temperatures have risen by about 1.5°C. Daytime highs moved from 30.1°C to 30.9°C and overnight lows from 17.1°C to 19.3°C over the same span.
May is one of the warmer months of the year in Killeen and a relatively wet time of year, so plan for around 30.1°C daytime highs and 18.1°C at night.
Not quite — May is the 8th coolest month in Killeen, averaging 24.1°C.
For May in Killeen, pack light, breathable clothing and sun protection, with typical highs of 30.1°C and lows of 18.1°C. Bring an umbrella or light rain jacket too.
Relative humidity in May averages 71% — moderately humid.
Average wind speed in May is 3 m/s. The windiest May on record averaged 4.4 m/s (1996).
The wettest May on record was 2015 with 283 mm. On average, May sees 118 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 Killeen 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.
