Alpena weather in August: Alpena, Michigan: normal highs, lows, rain and records for August
Alpena in August has a normal high of 79°F and a normal low of 55°F, a daily mean of 67°F, falling from 81°F on the 1st to 76°F by the 31st. Measurable precipitation falls on 10 days in a normal August, 3.09 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 26°C and low of 13°C, 78 mm of precipitation in August.
- 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 August?
The normal high is 79°F and the normal low 55°F, for a daily mean of 66.6°F. August is 1.6°F cooler than July and 7.6°F warmer than September. August is the 2nd warmest month of the year in Alpena and the 2nd wettest. Across the month the normal high falls 5°F, from 81°F on August 1 to 76°F on August 31. From one year to the next August's mean temperature typically moves about 2.4°F either way (NOAA's standard deviation), so roughly two Augusts in three average between 64°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 33%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| August 1 | 81°F | 56°F | 33% | 19% |
| August 8 | 80°F | 56°F | 32% | 18% |
| August 15 | 79°F | 55°F | 32% | 19% |
| August 22 | 78°F | 54°F | 32% | 19% |
| August 31 | 76°F | 52°F | 33% | 20% |
Every day of August: normal high, low and chance of precipitation (warmest afternoon August 1, coldest night August 31)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| August 1 | 81°F | 56°F | 33% | 19% | 14 h 40 min |
| August 2 | 80°F | 56°F | 33% | 19% | 14 h 40 min |
| August 3 | 80°F | 56°F | 33% | 18% | 14 h 40 min |
| August 4 | 80°F | 56°F | 33% | 18% | 14 h 40 min |
| August 5 | 80°F | 56°F | 32% | 18% | 14 h 30 min |
| August 6 | 80°F | 56°F | 32% | 18% | 14 h 30 min |
| August 7 | 80°F | 56°F | 32% | 18% | 14 h 30 min |
| August 8 | 80°F | 56°F | 32% | 18% | 14 h 30 min |
| August 9 | 80°F | 56°F | 32% | 18% | 14 h 20 min |
| August 10 | 80°F | 56°F | 32% | 18% | 14 h 20 min |
| August 11 | 80°F | 56°F | 32% | 18% | 14 h 20 min |
| August 12 | 80°F | 55°F | 32% | 18% | 14 h 20 min |
| August 13 | 79°F | 55°F | 32% | 18% | 14 h 10 min |
| August 14 | 79°F | 55°F | 32% | 18% | 14 h 10 min |
| August 15 | 79°F | 55°F | 32% | 19% | 14 h 10 min |
| August 16 | 79°F | 55°F | 32% | 19% | 14 h 10 min |
| August 17 | 79°F | 55°F | 32% | 19% | 14 h |
| August 18 | 79°F | 54°F | 32% | 19% | 14 h |
| August 19 | 79°F | 54°F | 32% | 19% | 14 h |
| August 20 | 79°F | 54°F | 32% | 19% | 13 h 50 min |
| August 21 | 78°F | 54°F | 32% | 19% | 13 h 50 min |
| August 22 | 78°F | 54°F | 32% | 19% | 13 h 50 min |
| August 23 | 78°F | 54°F | 32% | 19% | 13 h 50 min |
| August 24 | 78°F | 53°F | 32% | 19% | 13 h 40 min |
| August 25 | 78°F | 53°F | 33% | 19% | 13 h 40 min |
| August 26 | 77°F | 53°F | 33% | 19% | 13 h 40 min |
| August 27 | 77°F | 53°F | 33% | 20% | 13 h 30 min |
| August 28 | 77°F | 52°F | 33% | 20% | 13 h 30 min |
| August 29 | 77°F | 52°F | 33% | 20% | 13 h 30 min |
| August 30 | 77°F | 52°F | 33% | 20% | 13 h 30 min |
| August 31 | 76°F | 52°F | 33% | 20% | 13 h 20 min |
- Normal high
- 79°FAugust average
- Normal low
- 55°FAugust average
- Precipitation
- 3.09 inmonth total
- Days with precipitation
- 100.01 inch or more
- Days at 90°F or more
- 2
- Daylight
- 14 h 40 min to 13 h 20 minAugust 1 to August 31
- Days at 70°F or more
- 28
- Days at 80°F or more
- 13
- Sunshine
- 77%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 August?
On a given August day the chance of 0.01 inch or more is 32% on average, highest around August 31 (33%). In all, 3.09 in falls on 10 days of a normal August, 1 of them with an inch or more.
In a normal August in Alpena, 2 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00094849.
How humid and windy is Alpena in August?
At 3 p.m. the normal temperature is 73°F with 56% relative humidity and a dew point of 57°F; at 6 a.m. it is 56°F with 92% humidity. The wind averages 6.0 mph, most often from the south in the afternoon.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 56°F | 54°F | 92% | 3.5 mph | 63% |
| 9 a.m. | 66°F | 58°F | 76% | 7.1 mph | 57% |
| noon | 72°F | 57°F | 58% | 8.9 mph | 54% |
| 3 p.m. | 73°F | 57°F | 56% | 9.9 mph | 55% |
| 6 p.m. | 70°F | 57°F | 64% | 8.1 mph | 67% |
| 9 p.m. | 62°F | 57°F | 84% | 4.2 mph | 72% |
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 August in Alpena?
The warmest August temperature on Alpena's official record (since 1916) is 102°F, on August 2, 1988; the coldest is 29°F, on August 30, 1934. The wettest August brought 6.26 in (1994).
The August mean against the 1991-2020 normal of 66.6°F: 2021 71.0°F (+4.5), 2022 67.8°F (+1.2), 2023 65.0°F (−1.6), 2024 68.1°F (+1.5), 2025 66.2°F (−0.4), 2026 66.7°F (+0.1). 4 of 6 ran warmer than normal.
| August | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 71.0°F | +4.5°F | 2.43 in |
| 2022 | 67.8°F | +1.2°F | 2.87 in |
| 2023 | 65.0°F | −1.6°F | 3.54 in |
| 2024 | 68.1°F | +1.5°F | 1.75 in |
| 2025 | 66.2°F | −0.4°F | 3.60 in |
| 2026 | 66.7°F | +0.1°F | 4.76 in |
Source: records: ACIS, NWS threaded record APNthr; recent months: ACIS, station USW00094849. Records and recent months use complete months only.
How does August in Alpena compare across Michigan?
Across the 140 places PlainClimate covers in Michigan, August normal highs run from 72°F in Munising to 83°F in Morenci; Alpena's is 79°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.