Wheaton weather in September: Wheaton, Illinois: normal highs, lows, rain and records for September
Wheaton in September has a normal high of 78°F and a normal low of 54°F, a daily mean of 66°F, falling from 82°F on the 1st to 72°F by the 30th. Measurable precipitation falls on 8 days in a normal September, 3.30 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 26°C and low of 12°C, 84 mm of precipitation in September.
- NOAA stationWheaton (3 mi SE)
- Station IDUSC00119221
- Location41.81°N 88.07°W
- Elevation680 ft (207 m)
- From the center4 miles
- Population53,741
- Jan 33° 17°
- Feb 38° 20°
- Mar 50° 29°
- Apr 63° 38°
- May 74° 49°
- Jun 83° 59°
- Jul 86° 63°
- Aug 84° 62°
- Sep 78° 54°
- Oct 65° 43°
- Nov 50° 32°
- Dec 38° 23°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Wheaton in September?
The normal high is 78°F and the normal low 54°F, for a daily mean of 65.9°F. September is 7.0°F cooler than August and 11.9°F warmer than October. September is the 4th warmest month of the year in Wheaton and the 7th wettest. Across the month the normal high falls 10°F, from 82°F on September 1 to 72°F on September 30. From one year to the next September's mean temperature typically moves about 2.6°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 63°F and 69°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 28%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 82°F | 60°F | 27% | 18% |
| September 8 | 81°F | 57°F | 27% | 18% |
| September 15 | 79°F | 54°F | 27% | 18% |
| September 22 | 76°F | 51°F | 28% | 18% |
| September 30 | 72°F | 48°F | 28% | 18% |
Every day of September: normal high, low and chance of precipitation (warmest afternoon September 1, coldest night September 30)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| September 1 | 82°F | 60°F | 27% | 18% | 13 h 10 min |
| September 2 | 82°F | 59°F | 27% | 18% | 13 h 10 min |
| September 3 | 82°F | 59°F | 27% | 18% | 13 h 10 min |
| September 4 | 82°F | 59°F | 27% | 18% | 13 h |
| September 5 | 82°F | 58°F | 27% | 17% | 13 h |
| September 6 | 81°F | 58°F | 27% | 17% | 13 h |
| September 7 | 81°F | 57°F | 27% | 18% | 12 h 50 min |
| September 8 | 81°F | 57°F | 27% | 18% | 12 h 50 min |
| September 9 | 81°F | 57°F | 27% | 18% | 12 h 50 min |
| September 10 | 80°F | 56°F | 27% | 18% | 12 h 50 min |
| September 11 | 80°F | 56°F | 27% | 18% | 12 h 40 min |
| September 12 | 80°F | 55°F | 27% | 18% | 12 h 40 min |
| September 13 | 79°F | 55°F | 27% | 18% | 12 h 40 min |
| September 14 | 79°F | 55°F | 27% | 18% | 12 h 40 min |
| September 15 | 79°F | 54°F | 27% | 18% | 12 h 30 min |
| September 16 | 78°F | 54°F | 27% | 18% | 12 h 30 min |
| September 17 | 78°F | 53°F | 27% | 18% | 12 h 30 min |
| September 18 | 77°F | 53°F | 28% | 18% | 12 h 20 min |
| September 19 | 77°F | 52°F | 28% | 18% | 12 h 20 min |
| September 20 | 77°F | 52°F | 28% | 18% | 12 h 20 min |
| September 21 | 76°F | 52°F | 28% | 18% | 12 h 20 min |
| September 22 | 76°F | 51°F | 28% | 18% | 12 h 10 min |
| September 23 | 75°F | 51°F | 28% | 18% | 12 h 10 min |
| September 24 | 75°F | 50°F | 28% | 18% | 12 h 10 min |
| September 25 | 75°F | 50°F | 28% | 18% | 12 h 10 min |
| September 26 | 74°F | 49°F | 28% | 18% | 12 h |
| September 27 | 74°F | 49°F | 28% | 18% | 12 h |
| September 28 | 73°F | 49°F | 28% | 18% | 12 h |
| September 29 | 73°F | 48°F | 28% | 18% | 11 h 50 min |
| September 30 | 72°F | 48°F | 28% | 18% | 11 h 50 min |
- Normal high
- 78°FSeptember average
- Normal low
- 54°FSeptember average
- Precipitation
- 3.30 inmonth total
- Days with precipitation
- 80.01 inch or more
- Days at 90°F or more
- 2
- Daylight
- 13 h 10 min to 11 h 50 minSeptember 1 to September 30
- Days at 70°F or more
- 25
- Days at 80°F or more
- 15
- Sunshine
- 80%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USC00119221; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Wheaton in September?
On a given September day the chance of 0.01 inch or more is 27% on average, highest around September 22 (28%). In all, 3.30 in falls on 8 days of a normal September, 1 of them with an inch or more.
In a normal September in Wheaton, 2 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00119221.
What are the records for September in Wheaton?
The warmest September temperature on this station's record (since 1895) is 102°F, on September 15, 1939; the coldest is 26°F, on September 28, 1942. The wettest September brought 11.23 in (1961).
The September mean against the 1991-2020 normal of 65.9°F: 2021 67.8°F (+1.9), 2022 65.5°F (−0.4), 2023 64.5°F (−1.4), 2025 66.0°F (+0.1), 2026 68.5°F (+2.6). 3 of 5 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 67.8°F | +1.9°F | 1.00 in |
| 2022 | 65.5°F | −0.4°F | 4.98 in |
| 2023 | 64.5°F | −1.4°F | 4.38 in |
| 2025 | 66.0°F | +0.1°F | 0.73 in |
| 2026 | 68.5°F | +2.6°F | 4.75 in |
Source: records: ACIS, station USC00119221; recent months: ACIS, station USC00119221. Records and recent months use complete months only.
How does September in Wheaton compare across Illinois?
Across the 144 places PlainClimate covers in Illinois, September normal highs run from 72°F in Barrington to 84°F in Anna; Wheaton's is 78°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.