May is one of the warmer months of the year in Peoria, with average highs near 22.4°C and lows around 10.7°C (mean 16.5°C). It is a relatively wet time of year, averaging 110 mm of rainfall and 76% relative humidity across the period.
May is one of the warmer months of the year in Peoria. Across 45 years of records, the warmest May in Peoria was 2018 — when the month averaged 21.2°C — while the coldest was 1983 at 13.5°C. Typical May days reach 22.4°C with nights near 10.7°C. The long-term trend is warming, about 0.4°C per decade.
May is a relatively wet time of year in Peoria, averaging 110 mm of rainfall. The wettest May on record was 1995 with 243 mm, while the driest was 1992 at 21 mm.
Relative humidity in Peoria during May averages 76%. The most humid May was 1991 at 84%, and the least humid was 1988 at 65%.
May receives about 5.6 kWh/m²/day of solar energy in Peoria. The sunniest May was 1994 at 6.6 kWh/m²/day, and the cloudiest was 1995 at 4.4.
Average wind speed in Peoria during May is 3.2 m/s. The windiest Mays were 1985, 1997 and 2008 at 3.7 m/s, while the calmest were 1994 and 2018 at 2.7 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 15.9°C | 16.0°C | 16.5°C | 17.5°C | 16.9°C | +1°C |
| Avg High | 22.0°C | 21.8°C | 22.4°C | 23.2°C | 22.7°C | +0.7°C |
| Avg Low | 9.8°C | 10.3°C | 10.6°C | 11.8°C | 11.1°C | +1.3°C |
| Avg Rain | 97 mm | 124 mm | 105 mm | 122 mm | 98 mm | +1 mm |
May temperatures in Peoria have risen by about 2°C between 1981–1985 and 2021–2025.
May has ranged from a record low of -2.7°C (1989) to a record high of 34°C (2012).
Rainfall in May is a relatively wet time of year, averaging 110 mm, with a wettest year of 243 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.
A good time to visit Peoria
May is a good time to visit Peoria, with days averaging 22.4°C and nights around 10.7°C (mean 16.5°C, warmer than Peoria's yearly average) and higher rainfall. June and August 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 | 22.6°C | 16.3°C | 10.0°C | 31.3°C | 4.3°C | 81 mm | 71% | 3.2 m/s | 5.6 |
| 2024 | 24.6°C | 18.7°C | 12.9°C | 29.9°C | 8.2°C | 95 mm | 75% | 2.9 m/s | 6.3 |
| 2023 | 24.3°C | 17.9°C | 11.4°C | 31.2°C | 1.9°C | 57 mm | 67% | 2.8 m/s | 6.4 |
| 2022 | 23.1°C | 17.8°C | 12.4°C | 30.5°C | 3.7°C | 96 mm | 79% | 3.6 m/s | 5.2 |
| 2021 | 21.2°C | 15.6°C | 10.1°C | 28.8°C | 1.2°C | 128 mm | 73% | 3.2 m/s | 5.3 |
| 2020 | 20.5°C | 15.2°C | 9.9°C | 28.7°C | 0.8°C | 129 mm | 79% | 3.1 m/s | 5.2 |
| 2019 | 21.9°C | 16.9°C | 11.9°C | 28.2°C | 4.4°C | 185 mm | 81% | 3.2 m/s | 5.1 |
| 2018 🔥 | 27.2°C | 21.2°C | 15.2°C | 33.6°C | 9.0°C | 75 mm | 76% | 2.7 m/s | 6 |
| 2017 | 21.8°C | 15.9°C | 9.9°C | 29.1°C | 3.1°C | 93 mm | 76% | 3.5 m/s | 5.9 |
| 2016 | 21.8°C | 16.3°C | 10.7°C | 28.5°C | 2.0°C | 100 mm | 76% | 2.9 m/s | 5.8 |
| 2015 | 23.5°C | 17.8°C | 12.2°C | 28.2°C | 2.7°C | 139 mm | 76% | 3.3 m/s | 5.6 |
| 2014 | 22.9°C | 17.1°C | 11.3°C | 29.6°C | 2.3°C | 76 mm | 75% | 3.3 m/s | 5.8 |
| 2013 | 22.8°C | 17.5°C | 12.2°C | 29.3°C | 1.3°C | 198 mm | 80% | 3.3 m/s | 5.2 |
| 2012 | 25.8°C | 19.3°C | 12.8°C | 34.0°C | 6.8°C | 72 mm | 69% | 3.1 m/s | 6.5 |
| 2011 | 21.7°C | 16.1°C | 10.5°C | 30.1°C | -0.4°C | 136 mm | 81% | 3.4 m/s | 5.1 |
| 2010 | 22.3°C | 16.8°C | 11.3°C | 29.9°C | 1.0°C | 141 mm | 80% | 3.1 m/s | 5.4 |
| 2009 | 21.8°C | 15.9°C | 10.0°C | 28.1°C | 1.3°C | 126 mm | 77% | 2.9 m/s | 5.7 |
| 2008 | 20.2°C | 14.3°C | 8.5°C | 27.5°C | 2.1°C | 129 mm | 76% | 3.7 m/s | 5.1 |
| 2007 | 24.1°C | 18.6°C | 13.1°C | 29.3°C | 5.5°C | 54 mm | 76% | 3.2 m/s | 5.5 |
| 2006 | 21.6°C | 16.3°C | 11.0°C | 31.1°C | 3.2°C | 71 mm | 76% | 3.2 m/s | 5.6 |
| 2005 | 21.9°C | 15.6°C | 9.3°C | 28.1°C | -1.4°C | 30 mm | 71% | 3.2 m/s | 6.3 |
| 2004 | 24.2°C | 18.5°C | 12.9°C | 30.2°C | 0.1°C | 164 mm | 79% | 3.5 m/s | 5.4 |
| 2003 | 22.4°C | 16.0°C | 9.6°C | 28.9°C | 2.9°C | 105 mm | 72% | 3.4 m/s | 5.6 |
| 2002 | 20.6°C | 14.2°C | 7.9°C | 30.2°C | -0.4°C | 153 mm | 78% | 3.4 m/s | 5.5 |
| 2001 | 23.0°C | 17.4°C | 11.8°C | 30.3°C | 5.1°C | 108 mm | 73% | 3.3 m/s | 5.3 |
| 2000 | 24.5°C | 18.1°C | 11.8°C | 31.0°C | 4.0°C | 106 mm | 71% | 3.5 m/s | 4.8 |
| 1999 | 23.0°C | 17.0°C | 11.0°C | 26.9°C | 4.8°C | 108 mm | 75% | 3.4 m/s | 6 |
| 1998 | 24.4°C | 18.9°C | 13.4°C | 29.7°C | 7.7°C | 137 mm | 80% | 2.9 m/s | 5.7 |
| 1997 | 19.9°C | 13.7°C | 7.5°C | 28.7°C | 2.7°C | 84 mm | 70% | 3.7 m/s | 5.7 |
| 1996 | 21.9°C | 16.1°C | 10.4°C | 30.4°C | 3.8°C | 197 mm | 78% | 3.4 m/s | 4.5 |
| 1995 🌧️ | 20.4°C | 14.9°C | 9.4°C | 25.5°C | 3.9°C | 243 mm | 78% | 3.2 m/s | 4.4 |
| 1994 | 21.2°C | 14.8°C | 8.4°C | 28.2°C | 0.9°C | 55 mm | 76% | 2.7 m/s | 6.6 |
| 1993 | 21.7°C | 16.3°C | 10.9°C | 26.8°C | 2.7°C | 67 mm | 80% | 3.3 m/s | 5.3 |
| 1992 | 21.2°C | 14.9°C | 8.6°C | 27.6°C | 0.0°C | 21 mm | 71% | 2.8 m/s | 6.2 |
| 1991 | 24.3°C | 19.4°C | 14.5°C | 31.0°C | 3.3°C | 154 mm | 84% | 2.8 m/s | 5.4 |
| 1990 | 20.3°C | 14.4°C | 8.6°C | 25.3°C | 1.6°C | 174 mm | 77% | 3.6 m/s | 5 |
| 1989 | 20.8°C | 14.6°C | 8.3°C | 29.3°C | -2.7°C | 97 mm | 72% | 3.2 m/s | 5.6 |
| 1988 | 24.3°C | 17.0°C | 9.6°C | 30.8°C | 2.2°C | 41 mm | 65% | 3.1 m/s | 6.5 |
| 1987 | 24.8°C | 18.7°C | 12.7°C | 28.5°C | 3.6°C | 59 mm | 74% | 2.9 m/s | 6.4 |
| 1986 | 22.3°C | 16.7°C | 11.0°C | 27.5°C | 2.9°C | 87 mm | 76% | 3 m/s | 5.2 |
| 1985 | 22.7°C | 16.7°C | 10.7°C | 29.0°C | 3.7°C | 71 mm | 75% | 3.7 m/s | 6 |
| 1984 | 19.7°C | 13.6°C | 7.5°C | 27.2°C | 1.3°C | 147 mm | 78% | 3.3 m/s | 5.3 |
| 1983 ❄️ | 19.3°C | 13.5°C | 7.7°C | 23.9°C | -2.0°C | 104 mm | 79% | 3.5 m/s | — |
| 1982 | 24.4°C | 18.7°C | 13.0°C | 27.4°C | 7.6°C | 121 mm | 79% | 2.9 m/s | — |
| 1981 | 20.1°C | 13.9°C | 7.7°C | 27.1°C | 1.1°C | 148 mm | 74% | 3.6 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 22.4°C with lows near 10.7°C (mean 16.5°C), based on 45 years of NASA POWER data.
May averages 110 mm of rainfall in Peoria, a relatively wet time of year. The wettest on record was 243 mm in 1995.
The hottest May reached 34°C in 2012. The coldest dipped to -2.7°C in 1989.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average May temperatures have risen by about 2°C. Daytime highs moved from 21.2°C to 23.2°C and overnight lows from 9.3°C to 11.4°C over the same span.
May is one of the warmer months of the year in Peoria and a relatively wet time of year, so plan for around 22.4°C daytime highs and 10.7°C at night.
Not quite — May is the 8th coolest month in Peoria, averaging 16.5°C.
For May in Peoria, pack light layers you can adjust through the day, with typical highs of 22.4°C and lows of 10.7°C. Bring an umbrella or light rain jacket too.
Relative humidity in May averages 76% — quite humid.
Average wind speed in May is 3.2 m/s. The windiest May on record averaged 3.7 m/s (1985).
The wettest May on record was 1995 with 243 mm. On average, May sees 110 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 Peoria 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.
