Alpena weather in September: Alpena, Michigan: normal highs, lows, rain and records for September
Alpena in September has a normal high of 71°F and a normal low of 47°F, a daily mean of 59°F, falling from 76°F on the 1st to 65°F by the 30th. Measurable precipitation falls on 11 days in a normal September, 2.84 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 22°C and low of 8°C, 72 mm of precipitation in September.
- NOAA stationAlpena County Regional Airport
- Station IDUSW00094849
- Location45.07°N 83.56°W
- Elevation684 ft (209 m)
- Population10,116
- Jan 28° 12°
- Feb 30° 11°
- Mar 39° 19°
- Apr 52° 30°
- May 66° 41°
- Jun 76° 50°
- Jul 81° 56°
- Aug 79° 55°
- Sep 71° 47°
- Oct 58° 37°
- Nov 45° 29°
- Dec 34° 20°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Alpena in September?
The normal high is 71°F and the normal low 47°F, for a daily mean of 59.0°F. September is 7.6°F cooler than August and 11.6°F warmer than October. September is the 4th warmest month of the year in Alpena and the 5th wettest. Across the month the normal high falls 11°F, from 76°F on September 1 to 65°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 56°F and 62°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 42%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 76°F | 51°F | 34% | 20% |
| September 8 | 74°F | 49°F | 36% | 21% |
| September 15 | 72°F | 47°F | 37% | 21% |
| September 22 | 69°F | 45°F | 39% | 21% |
| September 30 | 65°F | 42°F | 42% | 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 | 76°F | 51°F | 34% | 20% | 13 h 20 min |
| September 2 | 76°F | 51°F | 34% | 20% | 13 h 20 min |
| September 3 | 76°F | 51°F | 34% | 20% | 13 h 10 min |
| September 4 | 75°F | 51°F | 35% | 20% | 13 h 10 min |
| September 5 | 75°F | 50°F | 35% | 20% | 13 h 10 min |
| September 6 | 75°F | 50°F | 35% | 20% | 13 h |
| September 7 | 74°F | 50°F | 35% | 21% | 13 h |
| September 8 | 74°F | 49°F | 36% | 21% | 13 h |
| September 9 | 74°F | 49°F | 36% | 21% | 12 h 50 min |
| September 10 | 73°F | 49°F | 36% | 21% | 12 h 50 min |
| September 11 | 73°F | 49°F | 37% | 21% | 12 h 50 min |
| September 12 | 73°F | 48°F | 37% | 21% | 12 h 50 min |
| September 13 | 72°F | 48°F | 37% | 21% | 12 h 40 min |
| September 14 | 72°F | 48°F | 37% | 21% | 12 h 40 min |
| September 15 | 72°F | 47°F | 37% | 21% | 12 h 40 min |
| September 16 | 71°F | 47°F | 38% | 21% | 12 h 30 min |
| September 17 | 71°F | 47°F | 38% | 21% | 12 h 30 min |
| September 18 | 70°F | 46°F | 38% | 21% | 12 h 30 min |
| September 19 | 70°F | 46°F | 38% | 21% | 12 h 20 min |
| September 20 | 69°F | 46°F | 39% | 21% | 12 h 20 min |
| September 21 | 69°F | 45°F | 39% | 21% | 12 h 20 min |
| September 22 | 69°F | 45°F | 39% | 21% | 12 h 10 min |
| September 23 | 68°F | 45°F | 40% | 21% | 12 h 10 min |
| September 24 | 68°F | 44°F | 40% | 21% | 12 h 10 min |
| September 25 | 67°F | 44°F | 40% | 21% | 12 h 10 min |
| September 26 | 67°F | 44°F | 41% | 21% | 12 h |
| September 27 | 66°F | 43°F | 41% | 21% | 12 h |
| September 28 | 66°F | 43°F | 41% | 21% | 12 h |
| September 29 | 65°F | 43°F | 42% | 21% | 11 h 50 min |
| September 30 | 65°F | 42°F | 42% | 21% | 11 h 50 min |
- Normal high
- 71°FSeptember average
- Normal low
- 47°FSeptember average
- Precipitation
- 2.84 inmonth total
- Days with precipitation
- 110.01 inch or more
- Days at 90°F or more
- 1
- Nights at 32°F or colder
- 1
- Daylight
- 13 h 20 min to 11 h 50 minSeptember 1 to September 30
- Days at 70°F or more
- 16
- Days at 80°F or more
- 5
- Sunshine
- 75%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00094849; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Alpena in September?
On a given September day the chance of 0.01 inch or more is 38% on average, highest around September 30 (42%). In all, 2.84 in falls on 11 days of a normal September, 1 of them with an inch or more.
In a normal September in Alpena, 1 days reach 90°F and 1 nights fall to freezing.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00094849.
How humid and windy is Alpena in September?
At 3 p.m. the normal temperature is 61°F with 57% relative humidity and a dew point of 46°F; at 6 a.m. it is 47°F with 90% humidity. The wind averages 6.9 mph, most often from the west-southwest in the afternoon. A dew point under 50°F feels dry.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 47°F | 44°F | 90% | 4.8 mph | 53% |
| 9 a.m. | 54°F | 47°F | 79% | 7.5 mph | 49% |
| noon | 60°F | 46°F | 61% | 10.1 mph | 40% |
| 3 p.m. | 61°F | 46°F | 57% | 10.6 mph | 44% |
| 6 p.m. | 57°F | 46°F | 68% | 7.4 mph | 56% |
| 9 p.m. | 51°F | 46°F | 83% | 5.5 mph | 60% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00094849. Hourly normals exist only for NOAA's first-order stations; a dash where NOAA publishes no value for that hour (the sky at some hours).
What are the records for September in Alpena?
The warmest September temperature on Alpena's official record (since 1916) is 99°F, on September 1, 1953; the coldest is 23°F, on September 23, 1942. The wettest September brought 10.40 in (1937).
The September mean against the 1991-2020 normal of 59.0°F: 2021 59.8°F (+0.8), 2022 60.7°F (+1.7), 2023 61.9°F (+2.9), 2024 62.7°F (+3.7), 2025 59.5°F (+0.5), 2026 59.9°F (+0.9). 6 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 59.8°F | +0.8°F | 2.28 in |
| 2022 | 60.7°F | +1.7°F | 1.41 in |
| 2023 | 61.9°F | +2.9°F | 0.82 in |
| 2024 | 62.7°F | +3.7°F | 0.99 in |
| 2025 | 59.5°F | +0.5°F | 0.75 in |
| 2026 | 59.9°F | +0.9°F | 2.03 in |
Source: records: ACIS, NWS threaded record APNthr; recent months: ACIS, station USW00094849. Records and recent months use complete months only.
How does September in Alpena 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; Alpena's is 71°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.