Grand Rapids weather in September: Grand Rapids, Michigan: normal highs, lows, rain and records for September
Grand Rapids in September has a normal high of 74°F and a normal low of 53°F, a daily mean of 64°F, falling from 79°F on the 1st to 68°F by the 30th. Measurable precipitation falls on 10 days in a normal September, 3.43 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 23°C and low of 12°C, 87 mm of precipitation in September.
- 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 September?
The normal high is 74°F and the normal low 53°F, for a daily mean of 63.5°F. September is 7.6°F cooler than August and 12.0°F warmer than October. September is the 4th warmest month of the year in Grand Rapids and the 7th wettest. Across the month the normal high falls 11°F, from 79°F on September 1 to 68°F on September 30. From one year to the next September's mean temperature typically moves about 2.7°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 61°F and 66°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 37%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 79°F | 58°F | 32% | 20% |
| September 8 | 77°F | 56°F | 33% | 21% |
| September 15 | 74°F | 53°F | 34% | 21% |
| September 22 | 72°F | 51°F | 35% | 22% |
| September 30 | 68°F | 48°F | 37% | 24% |
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 | 79°F | 58°F | 32% | 20% | 13 h 10 min |
| September 2 | 78°F | 58°F | 32% | 20% | 13 h 10 min |
| September 3 | 78°F | 58°F | 32% | 20% | 13 h 10 min |
| September 4 | 78°F | 57°F | 32% | 20% | 13 h 10 min |
| September 5 | 78°F | 57°F | 33% | 20% | 13 h |
| September 6 | 77°F | 57°F | 33% | 20% | 13 h |
| September 7 | 77°F | 56°F | 33% | 21% | 13 h |
| September 8 | 77°F | 56°F | 33% | 21% | 12 h 50 min |
| September 9 | 77°F | 56°F | 33% | 21% | 12 h 50 min |
| September 10 | 76°F | 55°F | 33% | 21% | 12 h 50 min |
| September 11 | 76°F | 55°F | 34% | 21% | 12 h 50 min |
| September 12 | 76°F | 55°F | 34% | 21% | 12 h 40 min |
| September 13 | 75°F | 54°F | 34% | 21% | 12 h 40 min |
| September 14 | 75°F | 54°F | 34% | 21% | 12 h 40 min |
| September 15 | 74°F | 53°F | 34% | 21% | 12 h 30 min |
| September 16 | 74°F | 53°F | 34% | 21% | 12 h 30 min |
| September 17 | 74°F | 53°F | 34% | 22% | 12 h 30 min |
| September 18 | 73°F | 52°F | 35% | 22% | 12 h 30 min |
| September 19 | 73°F | 52°F | 35% | 22% | 12 h 20 min |
| September 20 | 72°F | 51°F | 35% | 22% | 12 h 20 min |
| September 21 | 72°F | 51°F | 35% | 22% | 12 h 20 min |
| September 22 | 72°F | 51°F | 35% | 22% | 12 h 10 min |
| September 23 | 71°F | 50°F | 36% | 23% | 12 h 10 min |
| September 24 | 71°F | 50°F | 36% | 23% | 12 h 10 min |
| September 25 | 70°F | 50°F | 36% | 23% | 12 h 10 min |
| September 26 | 70°F | 49°F | 36% | 23% | 12 h |
| September 27 | 69°F | 49°F | 37% | 23% | 12 h |
| September 28 | 69°F | 48°F | 37% | 23% | 12 h |
| September 29 | 69°F | 48°F | 37% | 24% | 11 h 50 min |
| September 30 | 68°F | 48°F | 37% | 24% | 11 h 50 min |
- Normal high
- 74°FSeptember average
- Normal low
- 53°FSeptember average
- Precipitation
- 3.43 inmonth total
- Days with precipitation
- 100.01 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
- 20
- Days at 80°F or more
- 8
- Sunshine
- 77%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 September?
On a given September day the chance of 0.01 inch or more is 34% on average, highest around September 30 (37%). In all, 3.43 in falls on 10 days of a normal September, 1 of them with an inch or more.
In a normal September in Grand Rapids, 1 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00094860.
How humid and windy is Grand Rapids in September?
At 3 p.m. the normal temperature is 65°F with 54% relative humidity and a dew point of 48°F; at 6 a.m. it is 50°F with 87% humidity. The wind averages 8.6 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. | 50°F | 47°F | 87% | 6.9 mph | 47% |
| 9 a.m. | 56°F | 49°F | 78% | 9.2 mph | – |
| noon | 63°F | 49°F | 60% | 11.2 mph | – |
| 3 p.m. | 65°F | 48°F | 54% | 11.7 mph | 29% |
| 6 p.m. | 62°F | 48°F | 62% | 8.9 mph | 35% |
| 9 p.m. | 55°F | 48°F | 77% | 7.3 mph | 45% |
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 September in Grand Rapids?
The warmest September temperature on Grand Rapids's official record (since 1892) is 98°F, on September 2, 1913; the coldest is 27°F, on September 28, 1991. The wettest September brought 11.85 in (1986).
The September mean against the 1991-2020 normal of 63.5°F: 2021 65.6°F (+2.1), 2022 63.7°F (+0.2), 2023 64.6°F (+1.1), 2024 66.9°F (+3.4), 2025 65.1°F (+1.6), 2026 64.2°F (+0.7). 6 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 65.6°F | +2.1°F | 3.34 in |
| 2022 | 63.7°F | +0.2°F | 1.30 in |
| 2023 | 64.6°F | +1.1°F | 1.25 in |
| 2024 | 66.9°F | +3.4°F | 1.32 in |
| 2025 | 65.1°F | +1.6°F | 2.44 in |
| 2026 | 64.2°F | +0.7°F | 3.00 in |
Source: records: ACIS, NWS threaded record GRRthr; recent months: ACIS, station USW00094860. Records and recent months use complete months only.
How does September in Grand Rapids 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; Grand Rapids's is 74°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.
Other months and places
- Grand Rapids in August81°F by day, 61°F at night
- Grand Rapids in October61°F by day, 42°F at night
- Grand Rapids through the yearEvery month, frost dates, records and recent years
- Michigan in SeptemberThe statewide normal and the warmest and coolest places
- Eau Claire: Michigan's warmest Septembernormal high 76°F