Bloomington weather in September: Bloomington, Illinois: normal highs, lows, rain and records for September
Bloomington in September has a normal high of 76°F and a normal low of 54°F, a daily mean of 65°F, falling from 81°F on the 1st to 70°F by the 30th. Measurable precipitation falls on 8 days in a normal September, 3.15 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 25°C and low of 12°C, 80 mm of precipitation in September.
- NOAA stationBloomington (5 mi W)
- Station IDUSC00110764
- Location40.49°N 89.09°W
- Elevation852 ft (260 m)
- From the center6 miles
- Population79,232
- Jan 31° 16°
- Feb 36° 19°
- Mar 49° 29°
- Apr 62° 39°
- May 72° 50°
- Jun 81° 60°
- Jul 84° 63°
- Aug 83° 61°
- Sep 76° 54°
- Oct 63° 42°
- Nov 48° 30°
- Dec 35° 21°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Bloomington in September?
The normal high is 76°F and the normal low 54°F, for a daily mean of 65.2°F. September is 6.8°F cooler than August and 12.8°F warmer than October. September is the 4th warmest month of the year in Bloomington and the 7th wettest. Across the month the normal high falls 11°F, from 81°F on September 1 to 70°F on September 30. From one year to the next September's mean temperature typically moves about 2.5°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 63°F and 68°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 29%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 81°F | 59°F | 28% | 21% |
| September 8 | 79°F | 57°F | 28% | 21% |
| September 15 | 77°F | 55°F | 28% | 20% |
| September 22 | 74°F | 52°F | 28% | 20% |
| September 30 | 70°F | 48°F | 29% | 20% |
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 | 81°F | 59°F | 28% | 21% | 13 h 10 min |
| September 2 | 81°F | 59°F | 28% | 21% | 13 h 10 min |
| September 3 | 81°F | 59°F | 28% | 21% | 13 h |
| September 4 | 80°F | 58°F | 28% | 21% | 13 h |
| September 5 | 80°F | 58°F | 28% | 21% | 13 h |
| September 6 | 80°F | 58°F | 28% | 21% | 13 h |
| September 7 | 80°F | 57°F | 28% | 21% | 12 h 50 min |
| September 8 | 79°F | 57°F | 28% | 21% | 12 h 50 min |
| September 9 | 79°F | 57°F | 28% | 21% | 12 h 50 min |
| September 10 | 79°F | 56°F | 28% | 21% | 12 h 40 min |
| September 11 | 78°F | 56°F | 28% | 21% | 12 h 40 min |
| September 12 | 78°F | 56°F | 28% | 21% | 12 h 40 min |
| September 13 | 78°F | 55°F | 28% | 20% | 12 h 40 min |
| September 14 | 77°F | 55°F | 28% | 20% | 12 h 30 min |
| September 15 | 77°F | 55°F | 28% | 20% | 12 h 30 min |
| September 16 | 77°F | 54°F | 28% | 20% | 12 h 30 min |
| September 17 | 76°F | 54°F | 28% | 20% | 12 h 30 min |
| September 18 | 76°F | 53°F | 28% | 20% | 12 h 20 min |
| September 19 | 75°F | 53°F | 28% | 20% | 12 h 20 min |
| September 20 | 75°F | 53°F | 28% | 20% | 12 h 20 min |
| September 21 | 74°F | 52°F | 28% | 20% | 12 h 20 min |
| September 22 | 74°F | 52°F | 28% | 20% | 12 h 10 min |
| September 23 | 74°F | 51°F | 28% | 20% | 12 h 10 min |
| September 24 | 73°F | 51°F | 28% | 20% | 12 h 10 min |
| September 25 | 73°F | 50°F | 29% | 20% | 12 h 10 min |
| September 26 | 72°F | 50°F | 29% | 20% | 12 h |
| September 27 | 72°F | 50°F | 29% | 20% | 12 h |
| September 28 | 71°F | 49°F | 29% | 20% | 12 h |
| September 29 | 71°F | 49°F | 29% | 20% | 11 h 50 min |
| September 30 | 70°F | 48°F | 29% | 20% | 11 h 50 min |
- Normal high
- 76°FSeptember average
- Normal low
- 54°FSeptember average
- Precipitation
- 3.15 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
- 81%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USC00110764; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Bloomington in September?
On a given September day the chance of 0.01 inch or more is 28% on average, highest around September 30 (29%). In all, 3.15 in falls on 8 days of a normal September, 1 of them with an inch or more.
In a normal September in Bloomington, 3 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00110764.
How does September in Bloomington 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; Bloomington's is 76°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.