Springfield, IL weather in August
Springfield is warm and often humid in August, with some rain: highs average 85°F and nights drop to about 64°F. There are about 8 days with rain. This is the peak of the warm season in Springfield.
- Normal high
- 85°F
- Normal low
- 64°F
- Wet days
- 8
- 3.4 in total
- Muggy days
- 17
- dew point 65°F+
How August changes from start to finish
| August 1 | August 31 | |
|---|---|---|
| Normal high | 86°F | 84°F |
| Normal low | 66°F | 62°F |
| Chance of a wet day | 27% | 25% |
| Sunrise / sunset | 5:57 am / 8:12 pm | 6:25 am / 7:32 pm |
| Daylight | 14.2 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 am76°Fdew point 66°F
- Noon82°Fdew point 65°F
- 3 pm83°Fdew point 65°F
- 6 pm80°Fdew point 66°F
- 9 pm72°Fdew point 66°F
NOAA hourly normals (local standard time) from Springfield Capital Airport (4 mi away); average wind 6 mph; clear or few clouds in 66% of daytime hours, mostly cloudy or overcast in 21%.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F4 of 31
- Hot dayshigh 90°F or more7 of 31
- Muggy daysdaily mean dew point 65°F or more17 of 31
- Wet daysat least 0.01 in of rain or melted snow8 of 31
- Notable rainat least 0.10 in5 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 3.4 in; a dry August brings about 2.0 in and a wet one about 4.0 in (25th and 75th percentiles). About 2 days bring half an inch or more, and about 1 an inch or more.
How August varies from year to year
- Warmest August, 1991-20202007: average high 90°F
- Coolest August2004: average high 80°F
- Wettest August2016: 10.8 in
- Driest August2011: 0.3 in
- Highest reading99°F (August 31, 2011)
- Lowest reading44°F (August 13, 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 | 87°F | 85°F | 80°F |
| Normal low | 66°F | 64°F | 56°F |
| Wet days | 9 | 8 | 7 |
| Comfortable days | 2 | 4 | 12 |
| Daylight | 14.7 h | 13.7 h | 12.4 h |
Highs change by -2°F from July and -5°F into September.
Nearby alternatives in August
- Cooler: Madison, WI226 mi · high 80°F · 9 wet days
How Springfield ranks in August
- Normal high198th warmest of 378 cities; 1st of 8 in Illinois
- Wet days159th driest of 378
- Comfortable days151st most of 341
What to pack for Springfield in August
- Light, breathable clothing – highs near 85°F and about 17 muggy days
- A rain jacket or umbrella – rain on about 8 days
Heating and cooling
August has 3 heating degree days and 308 cooling degree days (base 65°F), 5% of the year's total heating and cooling demand.
Questions
How hot is Springfield 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 (most recently on August 31, 2011).
Does it rain a lot in Springfield in August?
About 8 days in August have at least 0.01 in of precipitation, and the normal total is 3.4 in. The wettest August in 1991-2020 was in 2016 (10.8 in); the driest was in 2011 (0.3 in).
Is August a good time to visit Springfield?
August ranks 6th of 12 months on our comfort score for Springfield (53 out of 100). It has about 4 comfortable days and about 7 days at 90°F or hotter. The best months are April and May.
Where the numbers come from
- Temperature, rain, snowfall, snow depth, frost dates, humidity and wind by hour and cloud cover: Springfield Capital Airport (USW00093822), 3.7 mi NW of the city center, 594 ft . NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Abraham Lincoln Capital Airport (724390-93822), 3.7 mi NW of the city center, 590 ft . Hourly observations, 1991-2020.