Kankakee weather in September: Kankakee, Illinois: normal highs, lows, rain and records for September
Kankakee in September has a normal high of 78°F and a normal low of 55°F, a daily mean of 67°F, falling from 82°F on the 1st to 73°F by the 30th. Measurable precipitation falls on 8 days in a normal September, 3.56 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 26°C and low of 13°C, 90 mm of precipitation in September.
- NOAA stationKankakee Metro Wastewater
- Station IDUSC00114603
- Location41.13°N 87.89°W
- Elevation600 ft (183 m)
- Population23,535
- Jan 33° 16°
- Feb 37° 20°
- Mar 49° 29°
- Apr 61° 39°
- May 73° 51°
- Jun 82° 61°
- Jul 85° 65°
- Aug 83° 63°
- Sep 78° 55°
- Oct 65° 43°
- Nov 50° 32°
- Dec 38° 22°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Kankakee in September?
The normal high is 78°F and the normal low 55°F, for a daily mean of 66.5°F. September is 6.6°F cooler than August and 12.4°F warmer than October. September is the 4th warmest month of the year in Kankakee and the 6th wettest. Across the month the normal high falls 9°F, from 82°F on September 1 to 73°F on September 30. From one year to the next September's mean temperature typically moves about 2.8°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 64°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 27%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 82°F | 60°F | 26% | 18% |
| September 8 | 80°F | 58°F | 26% | 18% |
| September 15 | 78°F | 56°F | 26% | 18% |
| September 22 | 76°F | 53°F | 26% | 18% |
| September 30 | 73°F | 49°F | 27% | 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 | 26% | 18% | 13 h 10 min |
| September 2 | 82°F | 60°F | 26% | 18% | 13 h 10 min |
| September 3 | 82°F | 60°F | 26% | 18% | 13 h |
| September 4 | 81°F | 60°F | 26% | 18% | 13 h |
| September 5 | 81°F | 59°F | 26% | 18% | 13 h |
| September 6 | 81°F | 59°F | 26% | 18% | 13 h |
| September 7 | 81°F | 59°F | 26% | 18% | 12 h 50 min |
| September 8 | 80°F | 58°F | 26% | 18% | 12 h 50 min |
| September 9 | 80°F | 58°F | 26% | 18% | 12 h 50 min |
| September 10 | 80°F | 58°F | 26% | 18% | 12 h 50 min |
| September 11 | 80°F | 57°F | 26% | 18% | 12 h 40 min |
| September 12 | 79°F | 57°F | 26% | 18% | 12 h 40 min |
| September 13 | 79°F | 56°F | 26% | 18% | 12 h 40 min |
| September 14 | 79°F | 56°F | 26% | 18% | 12 h 30 min |
| September 15 | 78°F | 56°F | 26% | 18% | 12 h 30 min |
| September 16 | 78°F | 55°F | 26% | 18% | 12 h 30 min |
| September 17 | 78°F | 55°F | 26% | 18% | 12 h 30 min |
| September 18 | 77°F | 54°F | 26% | 18% | 12 h 20 min |
| September 19 | 77°F | 54°F | 26% | 18% | 12 h 20 min |
| September 20 | 77°F | 53°F | 26% | 18% | 12 h 20 min |
| September 21 | 76°F | 53°F | 26% | 18% | 12 h 20 min |
| September 22 | 76°F | 53°F | 26% | 18% | 12 h 10 min |
| September 23 | 76°F | 52°F | 26% | 18% | 12 h 10 min |
| September 24 | 75°F | 52°F | 26% | 18% | 12 h 10 min |
| September 25 | 75°F | 51°F | 26% | 18% | 12 h 10 min |
| September 26 | 74°F | 51°F | 26% | 18% | 12 h |
| September 27 | 74°F | 50°F | 27% | 18% | 12 h |
| September 28 | 74°F | 50°F | 27% | 18% | 12 h |
| September 29 | 73°F | 50°F | 27% | 18% | 11 h 50 min |
| September 30 | 73°F | 49°F | 27% | 18% | 11 h 50 min |
- Normal high
- 78°FSeptember average
- Normal low
- 55°FSeptember average
- Precipitation
- 3.56 inmonth total
- Days with precipitation
- 80.01 inch or more
- Days at 90°F or more
- 3
- 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
- 14
- Sunshine
- 79%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USC00114603; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Kankakee in September?
On a given September day the chance of 0.01 inch or more is 26% on average, highest around September 30 (27%). In all, 3.56 in falls on 8 days of a normal September, 1 of them with an inch or more.
In a normal September in Kankakee, 3 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00114603.
What are the records for September in Kankakee?
The September mean against the 1991-2020 normal of 66.5°F: 2021 69.7°F (+3.2), 2022 67.1°F (+0.6), 2023 66.7°F (+0.2), 2024 67.5°F (+1.0), 2025 68.2°F (+1.7), 2026 71.3°F (+4.8). 6 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 69.7°F | +3.2°F | 2.42 in |
| 2022 | 67.1°F | +0.6°F | 1.64 in |
| 2023 | 66.7°F | +0.2°F | 4.50 in |
| 2024 | 67.5°F | +1.0°F | 1.60 in |
| 2025 | 68.2°F | +1.7°F | 1.11 in |
| 2026 | 71.3°F | +4.8°F | 2.92 in |
Source: recent months: ACIS, station USC00114603. Records and recent months use complete months only.
How does September in Kankakee 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; Kankakee's is 78°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.