Peoria, IL weather in August
In August, Peoria sees highs around 85°F and lows around 64°F: warm and often humid, with some rain. Rain falls on about 8 days. It is one of the warmest months in Peoria.
- Normal high
- 85°F
- Normal low
- 64°F
- Wet days
- 8
- 3.3 in total
- Muggy days
- 15
- dew point 65°F+
How August changes from start to finish
| August 1 | August 31 | |
|---|---|---|
| Normal high | 86°F | 83°F |
| Normal low | 66°F | 62°F |
| Chance of a wet day | 28% | 27% |
| Sunrise / sunset | 5:55 am / 8:14 pm | 6:24 am / 7:32 pm |
| Daylight | 14.3 h | 13.1 h |
Chance of a wet day: average for the first and last 7 days of the month. Times are local clock time (Central Time).
A typical August day
- 6 am66°Fdew point 63°F
- 9 am75°Fdew point 64°F
- Noon80°Fdew point 64°F
- 3 pm82°Fdew point 64°F
- 6 pm79°Fdew point 65°F
- 9 pm72°Fdew point 65°F
NOAA hourly normals (local standard time) from Peoria Gtr Peoria Airport (5 mi away); average wind 6 mph; clear or few clouds in 62% of daytime hours, mostly cloudy or overcast in 25%.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F5 of 31
- Hot dayshigh 90°F or more6 of 31
- Muggy daysdaily mean dew point 65°F or more15 of 31
- Wet daysat least 0.01 in of rain or melted snow8 of 31
- Notable rainat least 0.10 in6 of 31
- Freezing nightslow 32°F or below0 of 31
- Snow on the groundsnow depth 1 in or more0 of 31
Average days per August, counted from daily records for each year 1991-2020.
Rain in August
Normal precipitation is 3.3 in; a dry August brings about 1.6 in and a wet one about 4.6 in (25th and 75th percentiles). About 3 days bring half an inch or more, and about 1 an inch or more.
How August varies from year to year
- Warmest August, 1991-20201995: average high 89°F
- Coolest August2004: average high 78°F
- Wettest August2016: 7.5 in
- Driest August1992: 0.3 in
- Highest reading99°F (August 30, 2013)
- Lowest reading47°F (August 14, 2004)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
August compared with July and September
| July | August | September | |
|---|---|---|---|
| Normal high | 86°F | 85°F | 78°F |
| Normal low | 66°F | 64°F | 56°F |
| Wet days | 9 | 8 | 8 |
| Comfortable days | 3 | 5 | 13 |
| Daylight | 14.8 h | 13.8 h | 12.5 h |
Highs change by -1°F from July and -7°F into September.
How Peoria ranks in August
- Normal high217th warmest of 378 cities; 2nd of 8 in Illinois
- Wet days171st driest of 378
- Comfortable days142nd most of 341
What to pack for Peoria in August
- Light, breathable clothing – highs near 85°F and about 15 muggy days
- A rain jacket or umbrella – rain on about 8 days
Heating and cooling
August has 3 heating degree days and 297 cooling degree days (base 65°F), 4% of the year's total heating and cooling demand.
Questions
How hot is Peoria in August?
The normal high is 85°F and the normal low is 64°F. From 1991 to 2020 the hottest August reading was 99°F (August 30, 2013).
Does it rain a lot in Peoria in August?
About 8 days in August have at least 0.01 in of precipitation, and the normal total is 3.3 in. The wettest August in 1991-2020 was in 2016 (7.5 in); the driest was in 1992 (0.3 in).
Is August a good time to visit Peoria?
August ranks 6th of 12 months on our comfort score for Peoria (54 out of 100). It has about 5 comfortable days and about 6 days at 90°F or hotter. The best month is May.
Where the numbers come from
- Temperature, rain, snowfall, snow depth, frost dates, humidity and wind by hour and cloud cover: Peoria Gtr Peoria Airport (USW00014842), 5.3 mi WSW of the city center, 650 ft (148 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Greater Peoria Regional Airport (725320-14842), 5.3 mi WSW of the city center, 655 ft (153 ft higher than the city). Hourly observations, 1991-2020.