May is one of the warmer months of the year in Olathe, with average highs near 23.8°C and lows around 12.2°C (mean 18°C). It is a relatively wet time of year, averaging 141 mm of rainfall and 75% relative humidity across the period.
May is one of the warmer months of the year in Olathe. Across 45 years of records, the warmest May in Olathe was 2018 — when the month averaged 23.4°C — while the coldest was 1983 at 15.2°C. Typical May days reach 23.8°C with nights near 12.2°C. The long-term trend is warming, about 0.3°C per decade.
May is a relatively wet time of year in Olathe, averaging 141 mm of rainfall. The wettest May on record was 1995 with 299 mm, while the driest was 1998 at 37 mm.
Relative humidity in Olathe during May averages 75%. The most humid May was 2019 at 83%, and the least humid were 1988 and 2000 at 64%.
May receives about 5.7 kWh/m²/day of solar energy in Olathe. The sunniest May was 2012 at 6.8 kWh/m²/day, and the cloudiest was 1995 at 3.9.
Average wind speed in Olathe during May is 3.2 m/s. The windiest Mays were 1996 and 2004 at 3.8 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 | 17.7°C | 17.4°C | 18.3°C | 18.6°C | 18.2°C | +0.5°C |
| Avg High | 23.5°C | 23.2°C | 24.3°C | 24.3°C | 23.8°C | +0.3°C |
| Avg Low | 11.8°C | 11.7°C | 12.4°C | 12.9°C | 12.5°C | +0.7°C |
| Avg Rain | 137 mm | 148 mm | 124 mm | 151 mm | 143 mm | +6 mm |
May temperatures in Olathe have risen by about 1.8°C between 1981–1985 and 2021–2025.
May has ranged from a record low of -1.3°C (1994) to a record high of 35.2°C (2000).
Rainfall in May is a relatively wet time of year, averaging 141 mm, with a wettest year of 299 mm.
A good time to visit Olathe
May is a good time to visit Olathe, with days averaging 23.8°C and nights around 12.2°C (mean 18°C, warmer than Olathe's yearly average) and higher rainfall. September and June are marginally more temperate, but May still suits most travellers.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 24.0°C | 17.8°C | 11.7°C | 30.0°C | 6.1°C | 112 mm | 70% | 2.8 m/s | 6 |
| 2024 | 25.2°C | 19.2°C | 13.3°C | 30.0°C | 8.6°C | 106 mm | 76% | 2.9 m/s | 5.9 |
| 2023 | 25.9°C | 19.7°C | 13.5°C | 33.0°C | 3.0°C | 105 mm | 68% | 2.4 m/s | 6.2 |
| 2022 | 24.3°C | 18.8°C | 13.3°C | 31.8°C | 4.3°C | 220 mm | 78% | 3.5 m/s | 5.2 |
| 2021 | 22.0°C | 16.9°C | 11.9°C | 29.3°C | 4.2°C | 178 mm | 79% | 2.9 m/s | 4.5 |
| 2020 | 21.6°C | 16.5°C | 11.4°C | 27.0°C | 1.7°C | 137 mm | 79% | 3 m/s | 5 |
| 2019 | 22.3°C | 17.4°C | 12.4°C | 29.2°C | 4.1°C | 275 mm | 83% | 3.1 m/s | 5.1 |
| 2018 🔥 | 29.5°C | 23.4°C | 17.3°C | 35.1°C | 11.3°C | 105 mm | 71% | 2.7 m/s | 6.2 |
| 2017 | 23.8°C | 17.7°C | 11.6°C | 29.8°C | 3.0°C | 110 mm | 74% | 3.3 m/s | 6.1 |
| 2016 | 22.6°C | 17.2°C | 11.7°C | 28.6°C | 4.1°C | 186 mm | 77% | 2.7 m/s | 5.6 |
| 2015 | 22.7°C | 17.6°C | 12.5°C | 27.7°C | 5.2°C | 260 mm | 78% | 3.2 m/s | 5 |
| 2014 | 25.8°C | 19.1°C | 12.5°C | 32.1°C | 1.8°C | 54 mm | 67% | 3.1 m/s | 6.1 |
| 2013 | 23.2°C | 17.5°C | 11.9°C | 31.5°C | 0.9°C | 171 mm | 77% | 3.5 m/s | 5 |
| 2012 | 27.2°C | 20.8°C | 14.4°C | 33.0°C | 7.4°C | 69 mm | 67% | 3.5 m/s | 6.8 |
| 2011 | 23.4°C | 17.7°C | 12.0°C | 32.7°C | 1.7°C | 132 mm | 72% | 3.7 m/s | 5.2 |
| 2010 | 22.9°C | 17.5°C | 12.2°C | 29.9°C | 3.5°C | 151 mm | 77% | 3 m/s | 5.5 |
| 2009 | 22.9°C | 17.2°C | 11.6°C | 29.8°C | 7.3°C | 85 mm | 76% | 2.8 m/s | 5.9 |
| 2008 | 23.0°C | 17.3°C | 11.6°C | 29.5°C | 4.0°C | 133 mm | 77% | 3.6 m/s | 5.7 |
| 2007 | 24.0°C | 19.2°C | 14.4°C | 29.3°C | 6.7°C | 204 mm | 81% | 3 m/s | 5.3 |
| 2006 | 24.2°C | 18.4°C | 12.5°C | 33.5°C | 4.8°C | 66 mm | 71% | 3.2 m/s | 5.8 |
| 2005 | 24.2°C | 17.8°C | 11.4°C | 30.3°C | -0.5°C | 130 mm | 71% | 3.1 m/s | 6.7 |
| 2004 | 24.9°C | 19.2°C | 13.4°C | 30.4°C | 1.3°C | 155 mm | 77% | 3.8 m/s | 5.7 |
| 2003 | 24.5°C | 17.8°C | 11.1°C | 34.2°C | 6.2°C | 71 mm | 69% | 3 m/s | 5.9 |
| 2002 | 23.2°C | 16.8°C | 10.4°C | 30.9°C | 3.9°C | 176 mm | 73% | 3.4 m/s | 5.9 |
| 2001 | 24.6°C | 18.9°C | 13.1°C | 31.4°C | 6.3°C | 137 mm | 74% | 3.6 m/s | 5.8 |
| 2000 | 27.5°C | 20.9°C | 14.3°C | 35.2°C | 6.9°C | 78 mm | 64% | 3.5 m/s | 5.5 |
| 1999 | 22.7°C | 17.0°C | 11.4°C | 27.0°C | 5.7°C | 158 mm | 78% | 3.4 m/s | 5.9 |
| 1998 | 26.9°C | 20.7°C | 14.5°C | 34.2°C | 7.1°C | 37 mm | 76% | 2.9 m/s | 6.6 |
| 1997 | 22.1°C | 15.5°C | 9.0°C | 30.4°C | 1.3°C | 136 mm | 70% | 3.3 m/s | 6.3 |
| 1996 | 24.9°C | 19.0°C | 13.1°C | 32.9°C | 4.5°C | 217 mm | 75% | 3.8 m/s | 4.7 |
| 1995 🌧️ | 20.3°C | 15.3°C | 10.2°C | 26.3°C | 3.0°C | 299 mm | 82% | 3.1 m/s | 3.9 |
| 1994 | 23.3°C | 17.0°C | 10.8°C | 29.9°C | -1.3°C | 51 mm | 78% | 2.4 m/s | 6.7 |
| 1993 | 21.8°C | 16.8°C | 11.9°C | 27.2°C | 5.2°C | 182 mm | 82% | 3.1 m/s | 5.4 |
| 1992 | 22.5°C | 16.5°C | 10.5°C | 27.7°C | 2.4°C | 44 mm | 73% | 2.9 m/s | 5.8 |
| 1991 | 25.9°C | 20.8°C | 15.7°C | 30.8°C | 3.0°C | 145 mm | 80% | 3 m/s | 5.2 |
| 1990 | 21.4°C | 15.7°C | 10.0°C | 29.0°C | 2.3°C | 213 mm | 79% | 3.6 m/s | 4.8 |
| 1989 | 24.5°C | 18.0°C | 11.5°C | 31.7°C | 2.1°C | 115 mm | 65% | 3.4 m/s | 5.6 |
| 1988 | 26.3°C | 19.6°C | 12.8°C | 30.1°C | 8.1°C | 65 mm | 64% | 3.5 m/s | 6.1 |
| 1987 | 24.8°C | 19.7°C | 14.7°C | 28.2°C | 9.2°C | 144 mm | 81% | 3.2 m/s | 6.3 |
| 1986 | 23.1°C | 17.9°C | 12.7°C | 27.6°C | 5.1°C | 147 mm | 78% | 2.8 m/s | 5.7 |
| 1985 | 23.9°C | 18.1°C | 12.2°C | 29.3°C | 6.9°C | 124 mm | 76% | 3.3 m/s | 5.9 |
| 1984 | 21.4°C | 15.6°C | 9.7°C | 26.9°C | 1.2°C | 73 mm | 78% | 3 m/s | 5.2 |
| 1983 ❄️ | 21.2°C | 15.2°C | 9.1°C | 27.5°C | 2.8°C | 118 mm | 76% | 3.6 m/s | — |
| 1982 | 23.4°C | 18.3°C | 13.1°C | 28.8°C | 4.6°C | 242 mm | 80% | 3.3 m/s | — |
| 1981 | 22.7°C | 16.5°C | 10.3°C | 27.5°C | 2.0°C | 206 mm | 69% | 3.6 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 23.8°C with lows near 12.2°C (mean 18°C), based on 45 years of NASA POWER data.
May averages 141 mm of rainfall in Olathe, a relatively wet time of year. The wettest on record was 299 mm in 1995.
The hottest May reached 35.2°C in 2000. The coldest dipped to -1.3°C in 1994.
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 22.5°C to 24.3°C and overnight lows from 10.9°C to 12.7°C over the same span.
May is one of the warmer months of the year in Olathe and a relatively wet time of year, so plan for around 23.8°C daytime highs and 12.2°C at night.
Not quite — May is the 8th coolest month in Olathe, averaging 18°C.
For May in Olathe, pack light layers you can adjust through the day, with typical highs of 23.8°C and lows of 12.2°C. Bring an umbrella or light rain jacket too.
Relative humidity in May averages 75% — moderately humid.
Average wind speed in May is 3.2 m/s. The windiest May on record averaged 3.8 m/s (1996).
The wettest May on record was 1995 with 299 mm. On average, May sees 141 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 Olathe 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.
