Grand Rapids weather in August: Grand Rapids, Michigan: normal highs, lows, rain and records for August
Grand Rapids in August has a normal high of 81°F and a normal low of 61°F, a daily mean of 71°F, falling from 82°F on the 1st to 79°F by the 31st. Measurable precipitation falls on 10 days in a normal August, 3.55 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 27°C and low of 16°C, 90 mm of precipitation in August.
- NOAA stationGrand Rapids Gerald R Ford International Airport
- Station IDUSW00094860
- Location42.89°N 85.54°W
- Elevation778 ft (237 m)
- From the center7 miles
- Population200,117
- Jan 31° 19°
- Feb 34° 20°
- Mar 45° 27°
- Apr 58° 37°
- May 70° 49°
- Jun 79° 58°
- Jul 83° 63°
- Aug 81° 61°
- Sep 74° 53°
- Oct 61° 42°
- Nov 47° 33°
- Dec 36° 25°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Grand Rapids in August?
The normal high is 81°F and the normal low 61°F, for a daily mean of 71.1°F. August is 1.7°F cooler than July and 7.6°F warmer than September. August is the 2nd warmest month of the year in Grand Rapids and the 6th wettest. Across the month the normal high falls 3°F, from 82°F on August 1 to 79°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 69°F and 74°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 32%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| August 1 | 82°F | 63°F | 32% | 19% |
| August 8 | 82°F | 62°F | 32% | 19% |
| August 15 | 81°F | 62°F | 32% | 20% |
| August 22 | 80°F | 61°F | 32% | 20% |
| August 31 | 79°F | 59°F | 32% | 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 | 82°F | 63°F | 32% | 19% | 14 h 30 min |
| August 2 | 82°F | 63°F | 32% | 19% | 14 h 30 min |
| August 3 | 82°F | 63°F | 32% | 19% | 14 h 30 min |
| August 4 | 82°F | 63°F | 32% | 19% | 14 h 30 min |
| August 5 | 82°F | 62°F | 32% | 19% | 14 h 20 min |
| August 6 | 82°F | 62°F | 32% | 19% | 14 h 20 min |
| August 7 | 82°F | 62°F | 32% | 19% | 14 h 20 min |
| August 8 | 82°F | 62°F | 32% | 19% | 14 h 20 min |
| August 9 | 82°F | 62°F | 32% | 19% | 14 h 10 min |
| August 10 | 82°F | 62°F | 32% | 19% | 14 h 10 min |
| August 11 | 82°F | 62°F | 32% | 19% | 14 h 10 min |
| August 12 | 81°F | 62°F | 32% | 20% | 14 h 10 min |
| August 13 | 81°F | 62°F | 32% | 20% | 14 h |
| August 14 | 81°F | 62°F | 32% | 20% | 14 h |
| August 15 | 81°F | 62°F | 32% | 20% | 14 h |
| August 16 | 81°F | 62°F | 32% | 20% | 14 h |
| August 17 | 81°F | 61°F | 32% | 20% | 13 h 50 min |
| August 18 | 81°F | 61°F | 32% | 20% | 13 h 50 min |
| August 19 | 81°F | 61°F | 32% | 20% | 13 h 50 min |
| August 20 | 81°F | 61°F | 32% | 20% | 13 h 50 min |
| August 21 | 81°F | 61°F | 32% | 20% | 13 h 40 min |
| August 22 | 80°F | 61°F | 32% | 20% | 13 h 40 min |
| August 23 | 80°F | 61°F | 32% | 20% | 13 h 40 min |
| August 24 | 80°F | 60°F | 32% | 20% | 13 h 40 min |
| August 25 | 80°F | 60°F | 32% | 20% | 13 h 30 min |
| August 26 | 80°F | 60°F | 32% | 20% | 13 h 30 min |
| August 27 | 80°F | 60°F | 32% | 20% | 13 h 30 min |
| August 28 | 79°F | 59°F | 32% | 20% | 13 h 20 min |
| August 29 | 79°F | 59°F | 32% | 20% | 13 h 20 min |
| August 30 | 79°F | 59°F | 32% | 20% | 13 h 20 min |
| August 31 | 79°F | 59°F | 32% | 20% | 13 h 20 min |
- Normal high
- 81°FAugust average
- Normal low
- 61°FAugust average
- Precipitation
- 3.55 inmonth total
- Days with precipitation
- 100.01 inch or more
- Days at 90°F or more
- 2
- Daylight
- 14 h 30 min to 13 h 20 minAugust 1 to August 31
- Days at 70°F or more
- 30
- Days at 80°F or more
- 18
- Sunshine
- 79%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00094860; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Grand Rapids in August?
On a given August day the chance of 0.01 inch or more is 32% on average, highest around August 27 (32%). In all, 3.55 in falls on 10 days of a normal August, 1 of them with an inch or more.
In a normal August in Grand Rapids, 2 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00094860.
How humid and windy is Grand Rapids in August?
At 3 p.m. the normal temperature is 78°F with 53% relative humidity and a dew point of 59°F; at 6 a.m. it is 61°F with 90% humidity. The wind averages 7.3 mph, most often from the west-southwest in the afternoon.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 61°F | 58°F | 90% | 5.2 mph | – |
| 9 a.m. | 68°F | 60°F | 76% | 8.0 mph | – |
| noon | 75°F | 60°F | 59% | 9.6 mph | – |
| 3 p.m. | 78°F | 59°F | 53% | 10.0 mph | – |
| 6 p.m. | 75°F | 59°F | 57% | 9.1 mph | 38% |
| 9 p.m. | 68°F | 60°F | 75% | 6.1 mph | 56% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00094860. 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 Grand Rapids?
The warmest August temperature on Grand Rapids's official record (since 1892) is 102°F, on August 6, 1918; the coldest is 39°F, on August 30, 1976. The wettest August brought 8.46 in (1987).
The August mean against the 1991-2020 normal of 71.1°F: 2021 74.3°F (+3.2), 2022 71.4°F (+0.3), 2023 69.3°F (−1.8), 2024 71.3°F (+0.2), 2025 70.2°F (−0.9), 2026 71.2°F (+0.1). 4 of 6 ran warmer than normal.
| August | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 74.3°F | +3.2°F | 2.33 in |
| 2022 | 71.4°F | +0.3°F | 4.98 in |
| 2023 | 69.3°F | −1.8°F | 2.93 in |
| 2024 | 71.3°F | +0.2°F | 2.27 in |
| 2025 | 70.2°F | −0.9°F | 1.63 in |
| 2026 | 71.2°F | +0.1°F | 4.92 in |
Source: records: ACIS, NWS threaded record GRRthr; recent months: ACIS, station USW00094860. Records and recent months use complete months only.
How does August in Grand Rapids 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; Grand Rapids's is 81°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.