Pontiac weather in September: Pontiac, Michigan: normal highs, lows, rain and records for September
Pontiac in September has a normal high of 73°F and a normal low of 53°F, a daily mean of 63°F, falling from 77°F on the 1st to 67°F by the 30th. Measurable precipitation falls on 11 days in a normal September, 3.08 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 23°C and low of 12°C, 78 mm of precipitation in September.
- NOAA stationPontiac Oakland County International Airport
- Station IDUSW00094817
- Location42.66°N 83.42°W
- Elevation976 ft (298 m)
- From the center7 miles
- Population62,528
- Jan 30° 17°
- Feb 33° 18°
- Mar 43° 26°
- Apr 57° 36°
- May 69° 48°
- Jun 78° 58°
- Jul 82° 62°
- Aug 80° 61°
- Sep 73° 53°
- Oct 60° 42°
- Nov 46° 32°
- Dec 35° 23°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Pontiac in September?
The normal high is 73°F and the normal low 53°F, for a daily mean of 62.8°F. September is 7.8°F cooler than August and 11.9°F warmer than October. September is the 4th warmest month of the year in Pontiac and the 3rd wettest. Across the month the normal high falls 10°F, from 77°F on September 1 to 67°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 60°F and 65°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 38%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 77°F | 58°F | 36% | 17% |
| September 8 | 76°F | 56°F | 37% | 18% |
| September 15 | 73°F | 53°F | 37% | 19% |
| September 22 | 71°F | 51°F | 37% | 19% |
| September 30 | 67°F | 48°F | 38% | 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 | 77°F | 58°F | 36% | 17% | 13 h 10 min |
| September 2 | 77°F | 58°F | 36% | 18% | 13 h 10 min |
| September 3 | 77°F | 58°F | 36% | 18% | 13 h 10 min |
| September 4 | 77°F | 57°F | 36% | 18% | 13 h |
| September 5 | 76°F | 57°F | 36% | 18% | 13 h |
| September 6 | 76°F | 57°F | 37% | 18% | 13 h |
| September 7 | 76°F | 56°F | 37% | 18% | 13 h |
| September 8 | 76°F | 56°F | 37% | 18% | 12 h 50 min |
| September 9 | 75°F | 56°F | 37% | 18% | 12 h 50 min |
| September 10 | 75°F | 55°F | 37% | 19% | 12 h 50 min |
| September 11 | 75°F | 55°F | 37% | 19% | 12 h 50 min |
| September 12 | 74°F | 54°F | 37% | 19% | 12 h 40 min |
| September 13 | 74°F | 54°F | 37% | 19% | 12 h 40 min |
| September 14 | 74°F | 54°F | 37% | 19% | 12 h 40 min |
| September 15 | 73°F | 53°F | 37% | 19% | 12 h 30 min |
| September 16 | 73°F | 53°F | 37% | 19% | 12 h 30 min |
| September 17 | 72°F | 53°F | 37% | 19% | 12 h 30 min |
| September 18 | 72°F | 52°F | 37% | 19% | 12 h 30 min |
| September 19 | 72°F | 52°F | 37% | 19% | 12 h 20 min |
| September 20 | 71°F | 51°F | 37% | 19% | 12 h 20 min |
| September 21 | 71°F | 51°F | 37% | 19% | 12 h 20 min |
| September 22 | 71°F | 51°F | 37% | 19% | 12 h 10 min |
| September 23 | 70°F | 50°F | 37% | 19% | 12 h 10 min |
| September 24 | 70°F | 50°F | 37% | 19% | 12 h 10 min |
| September 25 | 69°F | 49°F | 37% | 19% | 12 h 10 min |
| September 26 | 69°F | 49°F | 37% | 20% | 12 h |
| September 27 | 68°F | 49°F | 38% | 20% | 12 h |
| September 28 | 68°F | 48°F | 38% | 20% | 12 h |
| September 29 | 68°F | 48°F | 38% | 20% | 11 h 50 min |
| September 30 | 67°F | 48°F | 38% | 20% | 11 h 50 min |
- Normal high
- 73°FSeptember average
- Normal low
- 53°FSeptember average
- Precipitation
- 3.08 inmonth total
- Days with precipitation
- 110.01 inch or more
- Days at 90°F or more
- 1
- Daylight
- 13 h 10 min to 11 h 50 minSeptember 1 to September 30
- Days at 70°F or more
- 21
- Days at 80°F or more
- 7
- Sunshine
- 77%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00094817; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Pontiac in September?
On a given September day the chance of 0.01 inch or more is 37% on average, highest around September 30 (38%). In all, 3.08 in falls on 11 days of a normal September, 1 of them with an inch or more.
In a normal September in Pontiac, 1 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00094817.
What are the records for September in Pontiac?
The warmest September temperature on this station's record (since 1998) is 95°F, on September 2, 2011; the coldest is 35°F, on September 19, 2020. The wettest September brought 8.21 in (2008).
The September mean against the 1991-2020 normal of 62.8°F: 2021 64.7°F (+1.9), 2022 64.2°F (+1.4), 2023 64.0°F (+1.2), 2024 66.2°F (+3.4), 2025 65.5°F (+2.7), 2026 64.7°F (+1.9). 6 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 64.7°F | +1.9°F | 4.90 in |
| 2022 | 64.2°F | +1.4°F | 1.98 in |
| 2023 | 64.0°F | +1.2°F | 2.16 in |
| 2024 | 66.2°F | +3.4°F | 0.68 in |
| 2025 | 65.5°F | +2.7°F | – |
| 2026 | 64.7°F | +1.9°F | 2.82 in |
Source: records: ACIS, station USW00094817; recent months: ACIS, station USW00094817. Records and recent months use complete months only.
How does September in Pontiac compare across Michigan?
Across the 140 places PlainClimate covers in Michigan, September normal highs run from 65°F in Munising to 76°F in Eau Claire; Pontiac's is 73°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.