Appleton weather in September: Appleton, Wisconsin: normal highs, lows, rain and records for September
Appleton in September has a normal high of 72°F and a normal low of 51°F, a daily mean of 61°F, falling from 77°F on the 1st to 66°F by the 30th. Measurable precipitation falls on 10 days in a normal September, 3.18 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 22°C and low of 10°C, 81 mm of precipitation in September.
- NOAA stationAppleton
- Station IDUSC00470265
- Location44.28°N 88.44°W
- Elevation792 ft (241 m)
- From the center2 miles
- Population75,344
- Jan 25° 10°
- Feb 29° 12°
- Mar 41° 22°
- Apr 54° 34°
- May 67° 46°
- Jun 77° 57°
- Jul 82° 61°
- Aug 79° 60°
- Sep 72° 51°
- Oct 58° 39°
- Nov 43° 28°
- Dec 31° 17°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Appleton in September?
The normal high is 72°F and the normal low 51°F, for a daily mean of 61.3°F. September is 8.2°F cooler than August and 12.7°F warmer than October. September is the 4th warmest month of the year in Appleton and the 6th wettest. Across the month the normal high falls 11°F, from 77°F on September 1 to 66°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 59°F and 64°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 35%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 77°F | 56°F | 32% | 21% |
| September 8 | 75°F | 54°F | 33% | 21% |
| September 15 | 73°F | 51°F | 33% | 21% |
| September 22 | 70°F | 48°F | 34% | 21% |
| September 30 | 66°F | 45°F | 35% | 21% |
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 | 77°F | 56°F | 32% | 21% | 13 h 20 min |
| September 2 | 77°F | 56°F | 32% | 21% | 13 h 10 min |
| September 3 | 76°F | 56°F | 32% | 21% | 13 h 10 min |
| September 4 | 76°F | 55°F | 32% | 21% | 13 h 10 min |
| September 5 | 76°F | 55°F | 32% | 21% | 13 h 10 min |
| September 6 | 76°F | 55°F | 32% | 21% | 13 h |
| September 7 | 75°F | 54°F | 32% | 21% | 13 h |
| September 8 | 75°F | 54°F | 33% | 21% | 13 h |
| September 9 | 75°F | 53°F | 33% | 21% | 12 h 50 min |
| September 10 | 74°F | 53°F | 33% | 21% | 12 h 50 min |
| September 11 | 74°F | 53°F | 33% | 21% | 12 h 50 min |
| September 12 | 74°F | 52°F | 33% | 21% | 12 h 40 min |
| September 13 | 73°F | 52°F | 33% | 21% | 12 h 40 min |
| September 14 | 73°F | 52°F | 33% | 21% | 12 h 40 min |
| September 15 | 73°F | 51°F | 33% | 21% | 12 h 40 min |
| September 16 | 72°F | 51°F | 34% | 21% | 12 h 30 min |
| September 17 | 72°F | 50°F | 34% | 21% | 12 h 30 min |
| September 18 | 71°F | 50°F | 34% | 21% | 12 h 30 min |
| September 19 | 71°F | 49°F | 34% | 21% | 12 h 20 min |
| September 20 | 70°F | 49°F | 34% | 21% | 12 h 20 min |
| September 21 | 70°F | 49°F | 34% | 21% | 12 h 20 min |
| September 22 | 70°F | 48°F | 34% | 21% | 12 h 10 min |
| September 23 | 69°F | 48°F | 34% | 21% | 12 h 10 min |
| September 24 | 69°F | 47°F | 35% | 21% | 12 h 10 min |
| September 25 | 68°F | 47°F | 35% | 21% | 12 h 10 min |
| September 26 | 68°F | 47°F | 35% | 21% | 12 h |
| September 27 | 67°F | 46°F | 35% | 21% | 12 h |
| September 28 | 67°F | 46°F | 35% | 21% | 12 h |
| September 29 | 66°F | 45°F | 35% | 21% | 11 h 50 min |
| September 30 | 66°F | 45°F | 35% | 21% | 11 h 50 min |
- Normal high
- 72°FSeptember average
- Normal low
- 51°FSeptember average
- Precipitation
- 3.18 inmonth total
- Days with precipitation
- 100.01 inch or more
- Daylight
- 13 h 20 min to 11 h 50 minSeptember 1 to September 30
- Days at 70°F or more
- 18
- Days at 80°F or more
- 6
- Sunshine
- 76%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USC00470265; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Appleton in September?
On a given September day the chance of 0.01 inch or more is 33% on average, highest around September 30 (35%). In all, 3.18 in falls on 10 days of a normal September, 1 of them with an inch or more.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00470265.
What are the records for September in Appleton?
The warmest September temperature on this station's record (since 1893) is 101°F, on September 2, 1913; the coldest is 25°F, on September 30, 1993. The wettest September brought 10.10 in (2026).
The September mean against the 1991-2020 normal of 61.3°F: 2021 62.0°F (+0.7), 2022 61.9°F (+0.6), 2023 64.7°F (+3.4), 2024 65.2°F (+3.9), 2025 64.1°F (+2.8), 2026 64.8°F (+3.5). 6 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 62.0°F | +0.7°F | 1.56 in |
| 2022 | 61.9°F | +0.6°F | 4.23 in |
| 2023 | 64.7°F | +3.4°F | 1.48 in |
| 2024 | 65.2°F | +3.9°F | 2.10 in |
| 2025 | 64.1°F | +2.8°F | 2.67 in |
| 2026 | 64.8°F | +3.5°F | 10.10 in |
Source: records: ACIS, station USC00470265; recent months: ACIS, station USC00470265. Records and recent months use complete months only.
How does September in Appleton compare across Wisconsin?
Across the 165 places PlainClimate covers in Wisconsin, September normal highs run from 64°F in Laona to 77°F in West Allis; Appleton's is 72°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.