August is one of the warmer months of the year in Peoria, with average highs near 40.3°C and lows around 26.9°C (mean 33.6°C). It is a relatively wet time of year, averaging 32 mm of rainfall and 34% 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 2020 — when the month averaged 36.4°C — while the coldest was 1990 at 30.7°C. Typical August days reach 40.3°C with nights near 26.9°C. The long-term trend is warming, about 0.5°C per decade.
August is a relatively wet time of year in Peoria, averaging 32 mm of rainfall. The wettest August on record was 1983 with 82 mm, while the driest was 2002 at 3 mm.
Relative humidity in Peoria during August averages 34%. The most humid August was 1983 at 47%, and the least humid was 2025 at 23%.
August receives about 6.9 kWh/m²/day of solar energy in Peoria. The sunniest August was 1996 at 7.4 kWh/m²/day, and the cloudiest were 1984, 1988 and 2013 at 6.4.
Average wind speed in Peoria during August is 2 m/s. The windiest Augusts were 1989 and 1996 at 2.4 m/s, while the calmest were 1983, 2014 and 2022 at 1.6 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 32.7°C | 33.4°C | 33.3°C | 34.0°C | 34.9°C | +2.2°C |
| Avg High | 39.2°C | 40.1°C | 40.0°C | 40.7°C | 41.8°C | +2.6°C |
| Avg Low | 26.2°C | 26.6°C | 26.7°C | 27.2°C | 27.9°C | +1.7°C |
| Avg Rain | 38 mm | 35 mm | 29 mm | 28 mm | 30 mm | -8 mm |
August temperatures in Peoria have risen by about 1.7°C between 1981–1985 and 2021–2025.
August has ranged from a record low of 18.3°C (1990) to a record high of 48.7°C (2025).
Rainfall in August is a relatively wet time of year, averaging 32 mm, with a wettest year of 82 mm.
A quieter season to visit Peoria
If your dates are flexible, the more temperate months of April and October tend to be the most comfortable for visiting Peoria. That said, August — with days averaging 40.3°C and nights around 26.9°C (mean 33.6°C) and moderate rainfall (32 mm) — can still be rewarding for travellers who don't mind the warmth, and often means fewer crowds.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 43.1°C | 35.6°C | 28.1°C | 48.7°C | 25.4°C | 18 mm | 23% | 2.1 m/s | 7.1 |
| 2024 | 42.4°C | 35.5°C | 28.5°C | 46.7°C | 24.8°C | 24 mm | 28% | 2 m/s | 6.8 |
| 2023 | 42.8°C | 35.8°C | 28.7°C | 46.8°C | 24.4°C | 8 mm | 27% | 2.3 m/s | 6.6 |
| 2022 | 39.7°C | 33.4°C | 27.1°C | 43.7°C | 24.3°C | 57 mm | 43% | 1.6 m/s | 6.5 |
| 2021 | 39.3°C | 32.8°C | 26.2°C | 45.2°C | 22.1°C | 55 mm | 41% | 1.7 m/s | 6.8 |
| 2020 🔥 | 43.7°C | 36.4°C | 29.0°C | 46.2°C | 25.6°C | 17 mm | 24% | 2.1 m/s | 7 |
| 2019 | 43.0°C | 35.6°C | 28.1°C | 46.5°C | 26.1°C | 7 mm | 25% | 2.1 m/s | 7.2 |
| 2018 | 40.5°C | 33.9°C | 27.3°C | 46.2°C | 24.6°C | 30 mm | 35% | 1.9 m/s | 7.1 |
| 2017 | 40.8°C | 33.9°C | 27.0°C | 44.1°C | 22.6°C | 20 mm | 30% | 1.8 m/s | 7.1 |
| 2016 | 39.7°C | 33.3°C | 26.9°C | 44.3°C | 23.7°C | 36 mm | 36% | 1.8 m/s | 6.8 |
| 2015 | 41.7°C | 34.8°C | 27.9°C | 46.4°C | 25.7°C | 14 mm | 30% | 2.1 m/s | 7 |
| 2014 | 38.4°C | 31.9°C | 25.3°C | 42.4°C | 22.6°C | 61 mm | 39% | 1.6 m/s | 6.8 |
| 2013 | 39.8°C | 33.2°C | 26.6°C | 45.1°C | 23.0°C | 30 mm | 31% | 1.8 m/s | 6.4 |
| 2012 | 40.7°C | 34.3°C | 27.8°C | 46.6°C | 25.6°C | 39 mm | 36% | 1.7 m/s | 6.8 |
| 2011 | 43.1°C | 35.9°C | 28.7°C | 46.1°C | 27.1°C | 5 mm | 25% | 2 m/s | 7 |
| 2010 | 39.7°C | 33.2°C | 26.6°C | 44.2°C | 19.4°C | 34 mm | 35% | 2 m/s | 6.9 |
| 2009 | 41.2°C | 33.9°C | 26.6°C | 45.1°C | 22.6°C | 20 mm | 25% | 2 m/s | 7.3 |
| 2008 | 39.0°C | 32.9°C | 26.8°C | 45.6°C | 22.9°C | 53 mm | 39% | 1.8 m/s | 6.9 |
| 2007 | 40.4°C | 34.1°C | 27.8°C | 44.5°C | 24.2°C | 18 mm | 36% | 1.7 m/s | 6.8 |
| 2006 | 38.9°C | 32.6°C | 26.2°C | 42.4°C | 22.7°C | 41 mm | 38% | 1.7 m/s | 7 |
| 2005 | 38.8°C | 32.4°C | 26.1°C | 44.7°C | 22.5°C | 43 mm | 41% | 1.8 m/s | 6.8 |
| 2004 | 40.4°C | 33.3°C | 26.2°C | 45.4°C | 21.3°C | 16 mm | 28% | 2 m/s | 6.8 |
| 2003 | 39.5°C | 33.3°C | 27.0°C | 47.1°C | 22.6°C | 44 mm | 38% | 1.9 m/s | 6.7 |
| 2002 | 41.7°C | 33.9°C | 26.1°C | 45.0°C | 22.7°C | 3 mm | 23% | 2.3 m/s | 7.1 |
| 2001 | 40.2°C | 33.5°C | 26.8°C | 46.0°C | 22.4°C | 24 mm | 34% | 1.9 m/s | 6.9 |
| 2000 | 39.9°C | 33.5°C | 27.1°C | 46.6°C | 20.7°C | 32 mm | 34% | 1.9 m/s | 6.6 |
| 1999 | 40.6°C | 33.5°C | 26.3°C | 45.0°C | 22.2°C | 26 mm | 29% | 1.9 m/s | 6.9 |
| 1998 | 41.3°C | 34.7°C | 28.0°C | 45.8°C | 24.1°C | 30 mm | 33% | 2 m/s | 7 |
| 1997 | 39.7°C | 33.4°C | 27.2°C | 44.6°C | 24.0°C | 48 mm | 38% | 1.9 m/s | 6.7 |
| 1996 | 41.0°C | 34.0°C | 27.0°C | 44.7°C | 21.9°C | 22 mm | 33% | 2.4 m/s | 7.4 |
| 1995 | 41.4°C | 34.7°C | 28.0°C | 46.8°C | 24.7°C | 46 mm | 35% | 1.9 m/s | 6.8 |
| 1994 | 41.8°C | 35.2°C | 28.5°C | 46.3°C | 26.4°C | 13 mm | 31% | 2.2 m/s | 6.8 |
| 1993 | 39.3°C | 32.7°C | 26.0°C | 45.7°C | 21.4°C | 39 mm | 34% | 2.1 m/s | 6.7 |
| 1992 | 38.3°C | 32.0°C | 25.8°C | 45.2°C | 19.1°C | 52 mm | 42% | 2 m/s | 6.7 |
| 1991 | 39.7°C | 32.9°C | 26.0°C | 44.3°C | 23.1°C | 26 mm | 30% | 2.1 m/s | 6.6 |
| 1990 ❄️ | 37.8°C | 30.7°C | 23.5°C | 42.9°C | 18.3°C | 51 mm | 39% | 2.2 m/s | 6.9 |
| 1989 | 39.4°C | 32.2°C | 24.9°C | 42.8°C | 19.5°C | 14 mm | 33% | 2.4 m/s | 7.2 |
| 1988 | 39.0°C | 32.6°C | 26.1°C | 43.7°C | 22.6°C | 66 mm | 40% | 2.1 m/s | 6.4 |
| 1987 | 38.5°C | 31.9°C | 25.2°C | 42.8°C | 19.9°C | 27 mm | 35% | 1.9 m/s | 7 |
| 1986 | 39.4°C | 33.3°C | 27.3°C | 44.0°C | 24.4°C | 33 mm | 37% | 1.9 m/s | 6.8 |
| 1985 | 41.6°C | 34.2°C | 26.9°C | 46.0°C | 23.2°C | 15 mm | 27% | 2.1 m/s | 7.1 |
| 1984 | 37.4°C | 31.4°C | 25.4°C | 43.4°C | 22.4°C | 40 mm | 47% | 1.7 m/s | 6.4 |
| 1983 🌧️ | 37.3°C | 31.2°C | 25.1°C | 42.9°C | 20.4°C | 82 mm | 47% | 1.6 m/s | — |
| 1982 | 38.7°C | 32.7°C | 26.7°C | 44.1°C | 23.4°C | 48 mm | 41% | 1.8 m/s | — |
| 1981 | 41.8°C | 34.8°C | 27.9°C | 45.6°C | 24.8°C | 15 mm | 29% | 2.1 m/s | — |
Actual recorded August data for each year, 1981–2025 — sourced from NASA POWER.
The average high in August is around 40.3°C with lows near 26.9°C (mean 33.6°C), based on 45 years of NASA POWER data.
August averages 32 mm of rainfall in Peoria, a relatively wet time of year. The wettest on record was 82 mm in 1983.
The hottest August reached 48.7°C in 2025. The coldest dipped to 18.3°C in 1990.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average August temperatures have risen by about 1.7°C. Daytime highs moved from 39.4°C to 41.5°C and overnight lows from 26.4°C to 27.7°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 40.3°C daytime highs and 26.9°C at night.
Not quite — August is the 11th coolest month in Peoria, averaging 33.6°C.
For August in Peoria, pack light, breathable clothing and sun protection, with typical highs of 40.3°C and lows of 26.9°C.
Relative humidity in August averages 34% — relatively dry.
Average wind speed in August is 2 m/s. The windiest August on record averaged 2.4 m/s (1989).
The wettest August on record was 1983 with 82 mm. On average, August sees 32 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.
