August is one of the warmer months of the year in Peoria, with average highs near 29.1°C and lows around 17.6°C (mean 23.4°C). It is a relatively wet time of year, averaging 92 mm of rainfall and 71% relative humidity across the period.
August is one of the warmer months of the year in Peoria. Across 45 years of records, the warmest August in Peoria was 1988 — when the month averaged 26.9°C — while the coldest was 1992 at 19.4°C. Typical August days reach 29.1°C with nights near 17.6°C. The long-term trend is warming, about 0.2°C per decade.
August is a relatively wet time of year in Peoria, averaging 92 mm of rainfall. The wettest August on record was 1981 with 194 mm, while the driest was 2020 at 22 mm.
Relative humidity in Peoria during August averages 71%. The most humid August was 1993 at 85%, and the least humid was 1988 at 53%.
August receives about 5.5 kWh/m²/day of solar energy in Peoria. The sunniest Augusts were 2010, 2011 and 2020 at 6.1 kWh/m²/day, and the cloudiest was 2014 at 4.7.
Average wind speed in Peoria during August is 2.2 m/s. The windiest August was 2000 at 2.7 m/s, while the calmest was 1995 at 1.7 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 23.3°C | 22.7°C | 23.7°C | 23.5°C | 23.8°C | +0.5°C |
| Avg High | 29.4°C | 28.2°C | 29.6°C | 29.1°C | 29.7°C | +0.3°C |
| Avg Low | 17.2°C | 17.1°C | 17.8°C | 17.9°C | 17.9°C | +0.7°C |
| Avg Rain | 91 mm | 96 mm | 100 mm | 89 mm | 79 mm | -12 mm |
August temperatures in Peoria have risen by about 1.1°C between 1981–1985 and 2021–2025.
August has ranged from a record low of 6.6°C (1986) to a record high of 40.8°C (1988).
Rainfall in August is a relatively wet time of year, averaging 92 mm, with a wettest year of 194 mm.
One of the best times to visit Peoria
August is one of the best times to visit Peoria. Expect days averaging 29.1°C and nights around 17.6°C (mean 23.4°C) — warmer than Peoria's yearly average — with higher rainfall (92 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 | 29.6°C | 23.5°C | 17.4°C | 35.2°C | 10.8°C | 43 mm | 68% | 2.2 m/s | 5.9 |
| 2024 | 30.0°C | 23.8°C | 17.6°C | 37.1°C | 9.8°C | 85 mm | 66% | 2.3 m/s | 5.7 |
| 2023 | 29.8°C | 23.7°C | 17.6°C | 39.1°C | 9.6°C | 118 mm | 70% | 2.2 m/s | 5.4 |
| 2022 | 30.5°C | 24.4°C | 18.3°C | 34.1°C | 13.7°C | 96 mm | 69% | 2.3 m/s | 5.5 |
| 2021 | 28.9°C | 24.1°C | 19.3°C | 33.3°C | 13.6°C | 109 mm | 78% | 2 m/s | 5.6 |
| 2020 | 29.3°C | 23.3°C | 17.3°C | 36.0°C | 12.8°C | 22 mm | 70% | 2.1 m/s | 6.1 |
| 2019 | 27.7°C | 22.6°C | 17.5°C | 31.2°C | 12.2°C | 76 mm | 77% | 2.2 m/s | 5.5 |
| 2018 | 31.1°C | 25.1°C | 19.2°C | 35.4°C | 13.6°C | 125 mm | 70% | 2.5 m/s | 5.4 |
| 2017 | 29.0°C | 22.4°C | 15.9°C | 34.3°C | 12.3°C | 67 mm | 65% | 2.1 m/s | 5.6 |
| 2016 | 28.2°C | 23.9°C | 19.6°C | 33.5°C | 14.1°C | 169 mm | 82% | 2 m/s | 5.3 |
| 2015 | 26.6°C | 21.6°C | 16.6°C | 30.9°C | 10.5°C | 65 mm | 79% | 2.2 m/s | 5.8 |
| 2014 | 28.3°C | 23.4°C | 18.5°C | 34.2°C | 11.5°C | 117 mm | 78% | 2.2 m/s | 4.7 |
| 2013 | 28.9°C | 23.1°C | 17.4°C | 36.8°C | 11.9°C | 37 mm | 73% | 1.9 m/s | 5.9 |
| 2012 | 31.8°C | 24.6°C | 17.4°C | 37.9°C | 12.8°C | 110 mm | 55% | 2.1 m/s | 5.7 |
| 2011 | 30.5°C | 24.4°C | 18.2°C | 36.3°C | 14.3°C | 41 mm | 69% | 2.1 m/s | 6.1 |
| 2010 | 29.0°C | 24.0°C | 19.0°C | 33.0°C | 12.5°C | 79 mm | 80% | 2.1 m/s | 6.1 |
| 2009 | 25.7°C | 21.0°C | 16.3°C | 30.8°C | 7.9°C | 132 mm | 83% | 2.5 m/s | 5.2 |
| 2008 | 27.4°C | 21.8°C | 16.2°C | 31.5°C | 12.4°C | 40 mm | 76% | 2.1 m/s | 6 |
| 2007 | 31.3°C | 25.8°C | 20.2°C | 36.6°C | 12.5°C | 109 mm | 73% | 2.3 m/s | 5.5 |
| 2006 | 29.4°C | 24.0°C | 18.6°C | 36.8°C | 14.2°C | 106 mm | 71% | 2.3 m/s | 4.9 |
| 2005 | 31.5°C | 25.2°C | 18.9°C | 36.7°C | 13.6°C | 77 mm | 62% | 2.1 m/s | 5.6 |
| 2004 | 27.1°C | 21.1°C | 15.1°C | 32.9°C | 8.9°C | 128 mm | 71% | 2.5 m/s | 5.3 |
| 2003 | 31.5°C | 25.1°C | 18.6°C | 39.9°C | 15.3°C | 106 mm | 64% | 2.3 m/s | 5.7 |
| 2002 | 28.9°C | 23.4°C | 17.9°C | 33.6°C | 13.4°C | 132 mm | 74% | 2.3 m/s | 5.6 |
| 2001 | 31.2°C | 24.8°C | 18.3°C | 37.3°C | 12.6°C | 102 mm | 64% | 2.1 m/s | 5.7 |
| 2000 | 31.8°C | 24.9°C | 18.1°C | 37.5°C | 12.5°C | 69 mm | 65% | 2.7 m/s | 5.5 |
| 1999 | 28.7°C | 22.3°C | 16.0°C | 33.7°C | 11.7°C | 94 mm | 66% | 2.3 m/s | 5.6 |
| 1998 | 28.2°C | 23.1°C | 18.0°C | 33.9°C | 14.5°C | 78 mm | 79% | 2 m/s | 5.5 |
| 1997 | 28.2°C | 22.5°C | 16.8°C | 35.9°C | 12.1°C | 150 mm | 72% | 2.3 m/s | 5 |
| 1996 | 29.6°C | 23.5°C | 17.3°C | 34.8°C | 13.5°C | 47 mm | 68% | 2.1 m/s | 5.8 |
| 1995 | 29.5°C | 25.0°C | 20.6°C | 32.7°C | 15.4°C | 122 mm | 81% | 1.7 m/s | 5.6 |
| 1994 | 28.2°C | 21.8°C | 15.4°C | 33.2°C | 8.9°C | 96 mm | 72% | 2.3 m/s | 5.1 |
| 1993 | 27.1°C | 22.9°C | 18.7°C | 31.6°C | 12.9°C | 153 mm | 85% | 2.1 m/s | 5.2 |
| 1992 ❄️ | 25.2°C | 19.4°C | 13.6°C | 30.1°C | 9.5°C | 37 mm | 76% | 2.1 m/s | 5.5 |
| 1991 | 30.0°C | 24.0°C | 18.0°C | 38.0°C | 14.3°C | 88 mm | 65% | 2.1 m/s | 5.5 |
| 1990 | 27.1°C | 22.0°C | 16.9°C | 33.1°C | 10.2°C | 95 mm | 79% | 2 m/s | 5.5 |
| 1989 | 30.1°C | 23.9°C | 17.8°C | 36.8°C | 10.6°C | 116 mm | 66% | 2.3 m/s | 5.4 |
| 1988 🔥 | 33.8°C | 26.9°C | 20.0°C | 40.8°C | 9.5°C | 52 mm | 53% | 2.5 m/s | 5.7 |
| 1987 | 30.1°C | 23.9°C | 17.7°C | 37.8°C | 10.6°C | 107 mm | 68% | 2.5 m/s | 5 |
| 1986 | 27.2°C | 20.8°C | 14.3°C | 33.7°C | 6.6°C | 36 mm | 66% | 2.3 m/s | 5.6 |
| 1985 | 26.4°C | 20.8°C | 15.2°C | 30.9°C | 9.3°C | 114 mm | 77% | 2.2 m/s | 5 |
| 1984 | 30.8°C | 24.1°C | 17.4°C | 38.9°C | 10.4°C | 29 mm | 64% | 2.1 m/s | 5.7 |
| 1983 | 33.3°C | 26.7°C | 20.0°C | 39.3°C | 13.1°C | 81 mm | 63% | 2.1 m/s | — |
| 1982 | 26.8°C | 21.3°C | 15.8°C | 32.0°C | 9.7°C | 93 mm | 77% | 2.2 m/s | — |
| 1981 🌧️ | 26.0°C | 21.2°C | 16.5°C | 29.3°C | 10.7°C | 194 mm | 83% | 2.2 m/s | — |
Actual recorded August data for each year, 1981–2025 — sourced from NASA POWER.
The average high in August is around 29.1°C with lows near 17.6°C (mean 23.4°C), based on 45 years of NASA POWER data.
August averages 92 mm of rainfall in Peoria, a relatively wet time of year. The wettest on record was 194 mm in 1981.
The hottest August reached 40.8°C in 1988. The coldest dipped to 6.6°C in 1986.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average August temperatures have risen by about 1.1°C. Daytime highs moved from 28.7°C to 29.8°C and overnight lows from 17°C to 18°C over the same span.
August is one of the warmer months of the year in Peoria and a relatively wet time of year, so plan for around 29.1°C daytime highs and 17.6°C at night.
Not quite — August is the 11th coolest month in Peoria, averaging 23.4°C.
For August in Peoria, pack light layers you can adjust through the day, with typical highs of 29.1°C and lows of 17.6°C. Bring an umbrella or light rain jacket too.
Relative humidity in August averages 71% — moderately humid.
Average wind speed in August is 2.2 m/s. The windiest August on record averaged 2.7 m/s (2000).
The wettest August on record was 1981 with 194 mm. On average, August sees 92 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 August, 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 August specifically, along with year-by-year records and how the month has changed over the decades.
