Wilmington weather in September: Wilmington, Ohio: normal highs, lows, rain and records for September
Wilmington in September has a normal high of 77°F and a normal low of 54°F, a daily mean of 66°F, falling from 81°F on the 1st to 72°F by the 30th. Measurable precipitation falls on 11 days in a normal September, 2.93 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 25°C and low of 12°C, 74 mm of precipitation in September.
- NOAA stationWilmington Air Park
- Station IDUSW00013841
- Location39.42°N 83.82°W
- Elevation1,056 ft (322 m)
- Population12,639
- Jan 37° 21°
- Feb 41° 24°
- Mar 51° 32°
- Apr 64° 42°
- May 73° 52°
- Jun 82° 60°
- Jul 84° 63°
- Aug 83° 61°
- Sep 77° 54°
- Oct 65° 44°
- Nov 52° 34°
- Dec 41° 27°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Wilmington in September?
The normal high is 77°F and the normal low 54°F, for a daily mean of 65.6°F. September is 6.4°F cooler than August and 11.1°F warmer than October. September is the 4th warmest month of the year in Wilmington and the 10th wettest. Across the month the normal high falls 9°F, from 81°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 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 36%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 81°F | 58°F | 34% | 17% |
| September 8 | 80°F | 56°F | 34% | 16% |
| September 15 | 78°F | 54°F | 35% | 16% |
| September 22 | 75°F | 52°F | 35% | 17% |
| September 30 | 72°F | 49°F | 36% | 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 | 81°F | 58°F | 34% | 17% | 13 h 10 min |
| September 2 | 81°F | 58°F | 34% | 17% | 13 h |
| September 3 | 81°F | 58°F | 34% | 17% | 13 h |
| September 4 | 81°F | 57°F | 34% | 17% | 13 h |
| September 5 | 81°F | 57°F | 34% | 17% | 13 h |
| September 6 | 80°F | 57°F | 34% | 17% | 12 h 50 min |
| September 7 | 80°F | 57°F | 34% | 16% | 12 h 50 min |
| September 8 | 80°F | 56°F | 34% | 16% | 12 h 50 min |
| September 9 | 80°F | 56°F | 34% | 16% | 12 h 50 min |
| September 10 | 79°F | 56°F | 35% | 16% | 12 h 40 min |
| September 11 | 79°F | 56°F | 35% | 16% | 12 h 40 min |
| September 12 | 79°F | 55°F | 35% | 16% | 12 h 40 min |
| September 13 | 78°F | 55°F | 35% | 16% | 12 h 40 min |
| September 14 | 78°F | 55°F | 35% | 16% | 12 h 30 min |
| September 15 | 78°F | 54°F | 35% | 16% | 12 h 30 min |
| September 16 | 78°F | 54°F | 35% | 16% | 12 h 30 min |
| September 17 | 77°F | 54°F | 35% | 16% | 12 h 30 min |
| September 18 | 77°F | 53°F | 35% | 16% | 12 h 20 min |
| September 19 | 77°F | 53°F | 35% | 16% | 12 h 20 min |
| September 20 | 76°F | 53°F | 35% | 17% | 12 h 20 min |
| September 21 | 76°F | 52°F | 35% | 17% | 12 h 20 min |
| September 22 | 75°F | 52°F | 35% | 17% | 12 h 10 min |
| September 23 | 75°F | 52°F | 35% | 17% | 12 h 10 min |
| September 24 | 75°F | 51°F | 36% | 17% | 12 h 10 min |
| September 25 | 74°F | 51°F | 36% | 17% | 12 h 10 min |
| September 26 | 74°F | 51°F | 36% | 17% | 12 h |
| September 27 | 73°F | 50°F | 36% | 17% | 12 h |
| September 28 | 73°F | 50°F | 36% | 17% | 12 h |
| September 29 | 73°F | 50°F | 36% | 17% | 11 h 50 min |
| September 30 | 72°F | 49°F | 36% | 17% | 11 h 50 min |
- Normal high
- 77°FSeptember average
- Normal low
- 54°FSeptember average
- Precipitation
- 2.93 inmonth total
- Days with precipitation
- 110.01 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
- 14
- Sunshine
- 79%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00013841; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Wilmington in September?
On a given September day the chance of 0.01 inch or more is 35% on average, highest around September 27 (36%). In all, 2.93 in falls on 11 days of a normal September, 1 of them with an inch or more.
In a normal September in Wilmington, 2 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00013841.
What are the records for September in Wilmington?
The warmest September temperature on Wilmington's official record (since 1917) is 104°F, on September 14, 1939; the coldest is 26°F, on September 26, 1928. The wettest September brought 8.20 in (1965).
The September mean against the 1991-2020 normal of 65.6°F: 2021 67.8°F (+2.2), 2022 66.4°F (+0.8), 2023 68.4°F (+2.8), 2024 69.7°F (+4.1), 2025 67.1°F (+1.5), 2026 70.8°F (+5.2). 6 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 67.8°F | +2.2°F | 2.99 in |
| 2022 | 66.4°F | +0.8°F | 2.64 in |
| 2023 | 68.4°F | +2.8°F | 1.22 in |
| 2024 | 69.7°F | +4.1°F | 3.17 in |
| 2025 | 67.1°F | +1.5°F | 1.89 in |
| 2026 | 70.8°F | +5.2°F | 5.94 in |
Source: records: ACIS, NWS threaded record ILNthr; recent months: ACIS, station USW00013841. Records and recent months use complete months only.
How does September in Wilmington compare across Ohio?
Across the 99 places PlainClimate covers in Ohio, September normal highs run from 73°F in Ashtabula to 81°F in Chilo; Wilmington's is 77°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.