Bloomington weather in September: Bloomington, Indiana: normal highs, lows, rain and records for September
Bloomington in September has a normal high of 78°F and a normal low of 55°F, a daily mean of 67°F, falling from 83°F on the 1st to 73°F by the 30th. Measurable precipitation falls on 11 days in a normal September, 3.60 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 26°C and low of 13°C, 91 mm of precipitation in September.
- NOAA stationBloomington Monroe County Airport
- Station IDUSW00003893
- Location39.13°N 86.62°W
- Elevation844 ft (257 m)
- From the center5 miles
- Population79,986
- Jan 39° 22°
- Feb 43° 25°
- Mar 54° 33°
- Apr 66° 43°
- May 74° 53°
- Jun 82° 62°
- Jul 85° 64°
- Aug 84° 62°
- Sep 78° 55°
- Oct 67° 44°
- Nov 53° 34°
- Dec 42° 27°
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 78°F and the normal low 55°F, for a daily mean of 66.5°F. September is 6.8°F cooler than August and 11.2°F warmer than October. September is the 4th warmest month of the year in Bloomington and the 8th wettest. Across the month the normal high falls 10°F, from 83°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 37%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 83°F | 59°F | 36% | 15% |
| September 8 | 81°F | 57°F | 36% | 15% |
| September 15 | 79°F | 55°F | 36% | 16% |
| September 22 | 76°F | 52°F | 37% | 17% |
| September 30 | 73°F | 49°F | 37% | 17% |
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 | 83°F | 59°F | 36% | 15% | 13 h 10 min |
| September 2 | 82°F | 59°F | 36% | 15% | 13 h |
| September 3 | 82°F | 59°F | 36% | 15% | 13 h |
| September 4 | 82°F | 59°F | 36% | 15% | 13 h |
| September 5 | 82°F | 58°F | 36% | 15% | 13 h |
| September 6 | 81°F | 58°F | 36% | 15% | 12 h 50 min |
| September 7 | 81°F | 58°F | 36% | 15% | 12 h 50 min |
| September 8 | 81°F | 57°F | 36% | 15% | 12 h 50 min |
| September 9 | 81°F | 57°F | 36% | 15% | 12 h 50 min |
| September 10 | 80°F | 57°F | 36% | 15% | 12 h 40 min |
| September 11 | 80°F | 56°F | 36% | 15% | 12 h 40 min |
| September 12 | 80°F | 56°F | 36% | 16% | 12 h 40 min |
| September 13 | 79°F | 56°F | 36% | 16% | 12 h 40 min |
| September 14 | 79°F | 55°F | 36% | 16% | 12 h 30 min |
| September 15 | 79°F | 55°F | 36% | 16% | 12 h 30 min |
| September 16 | 78°F | 55°F | 36% | 16% | 12 h 30 min |
| September 17 | 78°F | 54°F | 36% | 16% | 12 h 30 min |
| September 18 | 78°F | 54°F | 36% | 16% | 12 h 20 min |
| September 19 | 77°F | 53°F | 36% | 16% | 12 h 20 min |
| September 20 | 77°F | 53°F | 37% | 16% | 12 h 20 min |
| September 21 | 77°F | 53°F | 37% | 17% | 12 h 20 min |
| September 22 | 76°F | 52°F | 37% | 17% | 12 h 10 min |
| September 23 | 76°F | 52°F | 37% | 17% | 12 h 10 min |
| September 24 | 76°F | 52°F | 37% | 17% | 12 h 10 min |
| September 25 | 75°F | 51°F | 37% | 17% | 12 h 10 min |
| September 26 | 75°F | 51°F | 37% | 17% | 12 h |
| September 27 | 74°F | 51°F | 37% | 17% | 12 h |
| September 28 | 74°F | 50°F | 37% | 17% | 12 h |
| September 29 | 74°F | 50°F | 37% | 17% | 12 h |
| September 30 | 73°F | 49°F | 37% | 17% | 11 h 50 min |
- Normal high
- 78°FSeptember average
- Normal low
- 55°FSeptember average
- Precipitation
- 3.60 inmonth total
- Days with precipitation
- 110.01 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
- 26
- Days at 80°F or more
- 15
- Sunshine
- 80%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00003893; 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 36% on average, highest around September 26 (37%). In all, 3.60 in falls on 11 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 USW00003893.
What are the records for September in Bloomington?
The warmest September temperature on this station's record (since 1998) is 99°F, on September 3, 2011; the coldest is 32°F, on September 22, 1999. The wettest September brought 10.04 in (2000).
The September mean against the 1991-2020 normal of 66.5°F: 2021 69.5°F (+3.0), 2022 67.6°F (+1.1), 2023 68.2°F (+1.7), 2024 69.6°F (+3.1), 2025 68.8°F (+2.3), 2026 72.7°F (+6.2). 6 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 69.5°F | +3.0°F | 4.83 in |
| 2022 | 67.6°F | +1.1°F | 3.66 in |
| 2023 | 68.2°F | +1.7°F | 0.49 in |
| 2024 | 69.6°F | +3.1°F | 3.56 in |
| 2025 | 68.8°F | +2.3°F | 1.35 in |
| 2026 | 72.7°F | +6.2°F | 0.36 in |
Source: records: ACIS, station USW00003893; recent months: ACIS, station USW00003893. Records and recent months use complete months only.
How does September in Bloomington compare across Indiana?
Across the 99 places PlainClimate covers in Indiana, September normal highs run from 74°F in Angola to 82°F in English; Bloomington's is 78°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.
Other months and places
- Bloomington in August84°F by day, 62°F at night
- Bloomington in October67°F by day, 44°F at night
- Bloomington through the yearEvery month, frost dates, records and recent years
- Indiana in SeptemberThe statewide normal and the warmest and coolest places
- English: Indiana's warmest Septembernormal high 82°F