Weather in Grand Rapids in September 2025
Average weather
Average temperature in Grand Rapids in September
The temperature in September is +73°F on average, with a range between a maximum of +90°F during the day and a minimum of +46°F at night.
The average maximum temperature goes down 4% by the end of the month, compared with the beginning of the month, from +81°F to +79°F.
Is Grand Rapids warm or cold in September?
Grand Rapids is typically warm in September.
Maximum temperatures go down compared to the previous month from +79°F to +73°F. The minimum temperature also goes down from +63°F to +55°F.
It’s generally warm, but pack a long-sleeve shirt for evenings.
Take a look at how September is compared to other months in Grand Rapids:
Climate in Grand Rapids in September
| August | September | October | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +79°F | +73°F | +61°F | ||||
| Min. temperature | ||||||
| +41°F | +28°F | +23°F | ||||
| Max. temperature | ||||||
| +95°F | +97°F | +86°F | ||||
| Rainfall | ||||||
| 96 mm | 84 mm | 98 mm | ||||
| Wind | ||||||
| 2 m/s | 2 m/s | 3 m/s | ||||
| Humidity | ||||||
| 75% | 75% | 75% | ||||
| Air pressure | ||||||
| 1015 HPa | 1016 HPa | 1016 HPa | ||||
| Sunny days | ||||||
| 6 | 6 | 5 | ||||
| Cloudy days | ||||||
| 9 | 10 | 11 | ||||
| Rainy days | ||||||
| 15 | 14 | 15 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
September weather is still as ok as in August. It’s getting colder in September. From +79°F in the day, the average maximum temperature lowers to +73°F. As September arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 96 mm to 84 mm. Humidity levels don’t change as the month goes on, averaging around 75%. The average wind speed doesn’t change much during September, staying around 2 m/s. The amount of sunny days stay about the same, averaging 6 sunny days during the month.
October brings much the same weather, it remains ok.
Wind
The average wind speed is 2 m/s getting up to 4 m/s which is a light breeze; barely moving the tree leaves.
The average wind speed in Grand Rapids is gradually increasing during September, going from 1 m/s to 1 m/s over the course of the month.
Rain
How was the weather last September in Grand Rapids?
Climate Change Over the Years
The climate in Grand Rapids in September has not changed that much over the last 43 years.
The average temperature was the lowest in 1996 (+55°F) and the highest in 2012 (+62°F). The driest year was 1989 with only 519 mm of rainfall, and the wettest year was 2021 with 1616 mm.
FAQ
Is September a good time to visit Grand Rapids?
Can you sunbathe in Grand Rapids in September?
Is Grand Rapids rainy in September?
Is it sunny in Grand Rapids in September?
Other cities in USA
Monthly weather in Grand Rapids
Source of the data
For this page, we’ve looked at the typical weather in Grand Rapids, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.
