Richmond weather in September: Richmond, Indiana: normal highs, lows, rain and records for September
Richmond 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 9 days in a normal September, 3.12 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 25°C and low of 12°C, 79 mm of precipitation in September.
- NOAA stationRichmond Water Works
- Station IDUSC00127370
- Location39.85°N 84.88°W
- Elevation1,005 ft (306 m)
- From the center2 miles
- Population35,561
- Jan 36° 20°
- Feb 40° 22°
- Mar 51° 31°
- Apr 64° 41°
- May 74° 52°
- Jun 82° 60°
- Jul 85° 64°
- Aug 84° 62°
- Sep 78° 54°
- Oct 66° 43°
- Nov 52° 33°
- Dec 40° 25°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Richmond in September?
The normal high is 78°F and the normal low 54°F, for a daily mean of 65.9°F. September is 6.8°F cooler than August and 11.7°F warmer than October. September is the 4th warmest month of the year in Richmond and the 10th 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 3.0°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 30%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 82°F | 59°F | 28% | 17% |
| September 8 | 80°F | 57°F | 28% | 17% |
| September 15 | 78°F | 55°F | 28% | 17% |
| September 22 | 76°F | 52°F | 29% | 17% |
| September 30 | 72°F | 49°F | 30% | 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 | 59°F | 28% | 17% | 13 h 10 min |
| September 2 | 82°F | 59°F | 28% | 17% | 13 h |
| September 3 | 82°F | 59°F | 28% | 17% | 13 h |
| September 4 | 81°F | 58°F | 28% | 17% | 13 h |
| September 5 | 81°F | 58°F | 28% | 17% | 13 h |
| September 6 | 81°F | 58°F | 28% | 17% | 12 h 50 min |
| September 7 | 81°F | 57°F | 28% | 17% | 12 h 50 min |
| September 8 | 80°F | 57°F | 28% | 17% | 12 h 50 min |
| September 9 | 80°F | 57°F | 28% | 17% | 12 h 50 min |
| September 10 | 80°F | 56°F | 28% | 17% | 12 h 40 min |
| September 11 | 79°F | 56°F | 28% | 17% | 12 h 40 min |
| September 12 | 79°F | 56°F | 28% | 17% | 12 h 40 min |
| September 13 | 79°F | 55°F | 28% | 17% | 12 h 40 min |
| September 14 | 78°F | 55°F | 28% | 17% | 12 h 30 min |
| September 15 | 78°F | 55°F | 28% | 17% | 12 h 30 min |
| September 16 | 78°F | 54°F | 28% | 17% | 12 h 30 min |
| September 17 | 77°F | 54°F | 28% | 17% | 12 h 30 min |
| September 18 | 77°F | 53°F | 29% | 17% | 12 h 20 min |
| September 19 | 77°F | 53°F | 29% | 17% | 12 h 20 min |
| September 20 | 76°F | 53°F | 29% | 17% | 12 h 20 min |
| September 21 | 76°F | 52°F | 29% | 17% | 12 h 20 min |
| September 22 | 76°F | 52°F | 29% | 17% | 12 h 10 min |
| September 23 | 75°F | 51°F | 29% | 17% | 12 h 10 min |
| September 24 | 75°F | 51°F | 29% | 18% | 12 h 10 min |
| September 25 | 74°F | 51°F | 30% | 18% | 12 h 10 min |
| September 26 | 74°F | 50°F | 30% | 18% | 12 h |
| September 27 | 74°F | 50°F | 30% | 18% | 12 h |
| September 28 | 73°F | 49°F | 30% | 18% | 12 h |
| September 29 | 73°F | 49°F | 30% | 18% | 11 h 50 min |
| September 30 | 72°F | 49°F | 30% | 18% | 11 h 50 min |
- Normal high
- 78°FSeptember average
- Normal low
- 54°FSeptember average
- Precipitation
- 3.12 inmonth total
- Days with precipitation
- 90.01 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
- 24
- Days at 80°F or more
- 13
- Sunshine
- 79%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USC00127370; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Richmond in September?
On a given September day the chance of 0.01 inch or more is 29% on average, highest around September 30 (30%). In all, 3.12 in falls on 9 days of a normal September, 1 of them with an inch or more.
In a normal September in Richmond, 2 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00127370.
What are the records for September in Richmond?
The warmest September temperature on this station's record (since 1968) is 100°F, on September 4, 2011; the coldest is 30°F, on September 23, 1974. The wettest September brought 8.36 in (2012).
The September mean against the 1991-2020 normal of 65.9°F: 2021 66.8°F (+0.9), 2022 65.3°F (−0.6), 2023 65.8°F (−0.2), 2024 67.0°F (+1.1), 2025 66.8°F (+0.9). 3 of 5 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 66.8°F | +0.9°F | 4.37 in |
| 2022 | 65.3°F | −0.6°F | 1.08 in |
| 2023 | 65.8°F | −0.2°F | 1.10 in |
| 2024 | 67.0°F | +1.1°F | 5.97 in |
| 2025 | 66.8°F | +0.9°F | 1.36 in |
Source: records: ACIS, station USC00127370; recent months: ACIS, station USC00127370. Records and recent months use complete months only.
How does September in Richmond 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; Richmond's is 78°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.