Springfield, IL weather in September
In September, Springfield sees highs around 80°F and lows around 56°F: warm, with some rain. Expect about 7 wet days. Good for outdoor plans.
- Normal high
- 80°F
- Normal low
- 56°F
- Wet days
- 7
- 2.9 in total
- Muggy days
- 5
- dew point 65°F+
How September changes from start to finish
| September 1 | September 30 | |
|---|---|---|
| Normal high | 84°F | 75°F |
| Normal low | 61°F | 50°F |
| Chance of a wet day | 25% | 26% |
| Sunrise / sunset | 6:26 am / 7:30 pm | 6:53 am / 6:43 pm |
| Daylight | 13.1 h | 11.8 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 September day
- 6 am58°Fdew point 55°F
- 9 am69°Fdew point 58°F
- Noon76°Fdew point 56°F
- 3 pm78°Fdew point 56°F
- 6 pm72°Fdew point 57°F
- 9 pm64°Fdew point 57°F
NOAA hourly normals (local standard time) from Springfield Capital Airport (4 mi away); average wind 7 mph; clear or few clouds in 70% of daytime hours, mostly cloudy or overcast in 23%.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F12 of 30
- Hot dayshigh 90°F or more4 of 30
- Muggy daysdaily mean dew point 65°F or more5 of 30
- Wet daysat least 0.01 in of rain or melted snow7 of 30
- Notable rainat least 0.10 in5 of 30
- Freezing nightslow 32°F or below0 of 30
- Snow on the groundsnow depth 1 in or more0 of 30
Average days per September, counted from daily records for each year 1991-2020.
Rain in September
Normal precipitation is 2.9 in; a dry September brings about 1.3 in and a wet one about 3.9 in (25th and 75th percentiles). About 2 days bring half an inch or more, and about 1 an inch or more.
How September varies from year to year
- Warmest September, 1991-20202007: average high 85°F
- Coolest September1993: average high 72°F
- Wettest September2008: 8.5 in
- Driest September2017: 0.01 in
- Highest reading102°F (September 1, 2011)
- Lowest reading32°F (September 29, 2003)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
September compared with August and October
| August | September | October | |
|---|---|---|---|
| Normal high | 85°F | 80°F | 67°F |
| Normal low | 64°F | 56°F | 45°F |
| Wet days | 8 | 7 | 9 |
| Comfortable days | 4 | 12 | 13 |
| Daylight | 13.7 h | 12.4 h | 11.1 h |
Highs change by -5°F from August and -13°F into October.
Nearby alternatives in September
- Cooler: South Bend, IN220 mi · high 74°F · 10 wet days
How Springfield ranks in September
- Normal high193rd warmest of 378 cities; 1st of 8 in Illinois
- Wet days165th driest of 378
- Comfortable days134th most of 342
Heating and cooling
September has 61 heating degree days and 151 cooling degree days (base 65°F), 3% of the year's total heating and cooling demand.
Questions
How hot is Springfield in September?
The normal high is 80°F and the normal low is 56°F. From 1991 to 2020 the hottest September reading was 102°F (September 1, 2011).
Does it rain a lot in Springfield in September?
About 7 days in September have at least 0.01 in of precipitation, and the normal total is 2.9 in. The wettest September in 1991-2020 was in 2008 (8.5 in); the driest was in 2017 (0.01 in).
Is September a good time to visit Springfield?
September ranks 3rd of 12 months on our comfort score for Springfield (63 out of 100). It has about 12 comfortable days and about 4 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.