Last updated: February 24, 2025
Experience the charming September weather in Grand Haven, United States, where temperatures typically reach a maximum of 27°C (82°F) and settle around an average of 19°C (66°F), providing a comfortable backdrop for outdoor activities. While the minimum temperature dips to 9°C (48°F), it's the ideal time to enjoy the transition of seasons. This month witnesses 106 mm (4.2 in) of precipitation across 9 days, contributing to the lush landscapes and vibrant fall colors. Coupled with a humidity level of 79%, the September climate offers a refreshing ambiance perfect for both residents and visitors alike.
As summer fades into autumn, September in Grand Haven ushers in a delightful transition in temperatures. With a minimum of 9°C (48°F) and a comfortable average of 19°C (66°F), the month offers a refreshing reprieve from the heat of the preceding months. The highs reach up to 27°C (82°F), allowing for plenty of pleasant days to enjoy outdoor activities before the cooler months set in. This shift marks a gradual decline from the peak summer warmth of July and August, making September an ideal time for both locals and visitors to embrace the crisp air and vibrant fall foliage without the chill that follows in October. The overall trend signifies a balanced climate: warm enough for relaxation but increasingly brisk, setting the stage for autumn's embrace.
In September, Grand Haven experiences a notable shift in precipitation, receiving 106 mm (4.2 in) of rainfall over 9 days. This increase marks a transition from the drier summer months of July and August, which saw only 59 mm (2.3 in) and 63 mm (2.5 in) respectively. As fall approaches, the drop in temperature brings moisture, positioning September as a month of comeback for rainfall. While it sits comfortably below October’s anticipated 147 mm (5.8 in), the uptick in precipitation serves as a reminder of the changing seasons, with the breezy autumn air often accompanied by refreshing showers that nourish the landscape.
In September, Grand Haven experiences a humidity level of 79%, positioning it as one of the more comfortable months of the year, particularly after the peak summer months of July and August, which average around 78% and 79% respectively. As autumn settles in, humidity begins to rise again, reaching 82% in October, hinting at the seasonal transition. Throughout the year, humidity levels in Grand Haven generally hover between 78% and 87%, with the winter months maintaining consistently high levels around 86-87%. This trend indicates a distinctive characteristic of the region's climate, where heavy moisture is a staple in the cooler months, while summer offers a slight reprieve, creating a dynamic atmosphere that shifts with the changing seasons.
As September rolls into Grand Haven, the UV Index reaches 7, categorizing the exposure as high and allowing for a burn time of approximately 25 minutes. This slight decline from the intense August UV levels reflects the transition towards cooler months, but caution is still advised for outdoor enthusiasts. While high exposure can often lead to sunburn in just a short period, this month represents a welcome relief from the extreme heat of summer when indices soared to 9 and 10. As autumn approaches, it’s essential to stay vigilant, ensuring that sun protection remains a priority. For more insights and tips on staying protected, check out Grand Haven UV Index.
UV Risk Categories
As the summer sun sets in Grand Haven, September enjoys a robust total of 284 sunshine hours, marking a delightful transition as the vibrant summer warmth begins to wane. After basking in the peak of summer with an impressive 366 hours in July and 344 hours in August, September still holds onto a significant amount of sunshine, although it sees a noticeable decline as the days gradually shorten. This month serves as a gentle reminder of the splendor of summer, yet foreshadows the cooler days ahead, consistently delivering more sunlight than the chillier months of October and November that follow. The trend showcases Grand Haven's inviting September, where the sun continues to paint the lakeshore golden, offering a perfect backdrop for outdoor adventures and autumn festivities.
As summer fades, September in Grand Haven, United States, ushers in a promising 54% chance of sunny weather, outperforming the previous months and showcasing a distinct upward trend. Following the peak of summer, where August enjoys a 51% likelihood of sunshine, September capitalizes on lingering warmth, making it one of the sunniest months of the year. This shift not only enhances outdoor activities but also offers a splendid backdrop for enjoying the vibrant fall season. However, as autumn approaches, the chance of clear skies begins to decline, as evidenced by the subsequent drop to 33% in October. This makes September a perfect moment to soak up those golden rays before the clouds of fall set in.
As September rolls into Grand Haven, the days begin to subtly shorten, offering around 12 hours of daylight. This marks a gentle decline from the sun-soaked heights of summer, where June dazzles with 15 hours of bright sunshine. While October will further reduce daylight to 10 hours, September serves as a transitional month, blending the lingering warmth of summer with the crisp hints of autumn. With 12 hours of daylight, residents can still savor longer evenings, making it the perfect time for outdoor activities before the days grow notably shorter in the cooler months ahead. This gradual shift in daylight duration highlights the rhythmic ebb and flow of seasons, inviting locals to revel in the picturesque twilight of September.
As summer fades into autumn, September in Grand Haven experiences a refreshing uptick in average wind speed, reaching 4.8 m/s (11 mph). This increase follows a gradual decline over the warmer months, where wind speeds hovered around their lowest in July and August. Interestingly, September's breezy conditions set the stage for a smooth transition into October, which maintains a similar average of 4.7 m/s (11 mph). The months leading into winter see a notable rise, with November and December bringing gustier winds of 6.2 m/s (14 mph) and 6.3 m/s (14 mph), respectively. This seasonal wind pattern not only marks a shift in climate but also enhances the picturesque beauty of Grand Haven as it prepares for the coming chill.
The weather in Grand Haven changes throughout the year, offering a unique experience in each season. Below is a month-by-month comparison of September's weather with other months, highlighting differences in temperature, precipitation, and other key factors. Click on each section to discover seasonal trends in Grand Haven and find detailed weather information for every month.
In September, the weather tends to be mild, with average temperatures ranging from a cool 9°C (48°F) to a warm 27°C (82°F), making it a pleasant month for outdoor activities. However, it also experiences significant rainfall, with approximately 106 mm (4.2 in) over about 9 days, accompanied by a humidity level of 79%. In contrast, January brings much harsher conditions, with temperatures plummeting to a minimum of -21°C (-6°F) and a maximum of only 9°C (48°F). Precipitation during this month is lower, at 73 mm (2.9 in), spread out over roughly 12 days, but the humidity rises to 87%, contributing to the cold and often challenging winter weather. For more details, you can check Grand Haven weather in January.
September and February offer starkly contrasting weather conditions. In September, temperatures range from a minimum of 9°C (48°F) to a maximum of 27°C (82°F), with an average of 19°C (66°F). The month experiences considerable rainfall, totaling 106 mm (4.2 in) over about 9 days, accompanied by a humidity level of 79%. In contrast, February is much colder, with temperatures dipping as low as -15°C (5°F) and reaching a maximum of 12°C (53°F), yielding an average temperature of -2°C (28°F). Although February has a lower total precipitation of 75 mm (3.0 in) spread over 14 days, it exhibits higher humidity at 87%. For a more detailed look at February weather, check out Grand Haven weather in February.
September and March present stark contrasts in weather conditions. In September, temperatures range from a mild 9°C (48°F) at night to a pleasantly warm 27°C (82°F) during the day, with an average of 19°C (66°F). The month sees a total precipitation of 106 mm (4.2 in) over 9 days and a moderate humidity of 79%. In contrast, March experiences much colder temperatures, with lows plummeting to -14°C (7°F) and highs reaching only 14°C (58°F), resulting in an average temperature of just 1°C (35°F). This month has slightly lower precipitation at 71 mm (2.8 in) spread over 11 days, but the humidity is higher at 86%. For a closer look at the weather specifics in March, you can visit Grand Haven weather in March.
When comparing the weather in September and April, a notable difference in temperatures is evident. September typically enjoys milder conditions, with average temperatures ranging from a minimum of 9°C (48°F) to a maximum of 27°C (82°F), making it a more temperate month with an average of 19°C (66°F). In contrast, April sees much cooler temperatures, with averages ranging from -4°C (25°F) to 17°C (64°F) and an average of only 5°C (42°F). Precipitation levels are quite similar, with September receiving 106 mm (4.2 in) over 9 days and April slightly less at 101 mm (4.0 in) over 13 days. Additionally, the humidity is higher in April at 87% compared to September's 79%. For a more detailed look at what to expect in April, check out Grand Haven weather in April.
When comparing the weather in September and May, notable differences emerge in both temperature and precipitation. September typically enjoys milder conditions with a minimum temperature of 9°C (48°F) and an average of 19°C (66°F), peaking at a warm 27°C (82°F). In contrast, May starts off cooler, with a minimum temperature of 1°C (35°F) and an average of only 12°C (53°F), although it can also reach a pleasant 26°C (79°F) at its highest.
In terms of precipitation, May sees slightly more rainfall at 128 mm (5.0 in) over 13 days compared to September's 106 mm (4.2 in) across 9 days. The humidity levels are fairly similar, with May at 82% and September at 79%. For a closer look at May's weather patterns, you can check Grand Haven weather in May.
In comparing the weather of September and June, both months exhibit similar temperature ranges, with minimums around 9°C (48-49°F) and maximums reaching 27°C (81-82°F). However, September tends to have a slightly warmer average temperature of 19°C (66°F) compared to June's average of 18°C (65°F). Precipitation is a notable difference, with September receiving 106 mm over 9 days, while June experiences slightly more rain at 118 mm over 12 days. Humidity levels are also comparable, with September at 79% and June slightly higher at 81%. For more detailed weather insights, you can check Grand Haven weather in June.
In comparison to July, September experiences a more moderate temperature range, with minimums dropping to 9°C (48°F) and maximums reaching 27°C (82°F), compared to July's minimum of 15°C (60°F) and maximum of 29°C (85°F). The average temperature in September is slightly lower at 19°C (66°F) than July's 22°C (72°F). Additionally, September tends to be wetter, with 106 mm (4.2 in) of precipitation over 9 days, whereas July sees only 59 mm (2.3 in) over 8 days. Humidity levels are fairly similar, with September at 79% and July at 78%. For more detailed information, you can check the Grand Haven weather in July.
When comparing the weather of September to August, several differences are evident. September tends to be cooler, with minimum temperatures dropping to 9°C (48°F) compared to August's milder minimum of 14°C (57°F). While both months experience similar maximum temperatures, September's average is slightly lower at 19°C (66°F) than August's 22°C (72°F). In terms of precipitation, September sees a significant increase, with 106 mm (4.2 in) over 9 days, while August receives only 63 mm (2.5 in) during the same number of days. Interestingly, humidity levels remain consistent at 79% in both months. For detailed insights into the weather specifics of August, you can visit Grand Haven weather in August.
September typically brings warmer temperatures, with averages reaching around 19°C (66°F) and maximums peaking at 27°C (82°F). It experiences moderate humidity at 79%, along with 106 mm (4.2 in) of precipitation over about 9 days. In contrast, October ushers in cooler weather, where the average temperature drops to 13°C (55°F) and maximums reach 24°C (75°F). The month also has increased rainfall, totaling 147 mm (5.8 in) over 17 days, accompanied by a slight rise in humidity to 82%. For more detailed insights, check out Grand Haven weather in October.
September typically features milder temperatures, with averages around 19°C (66°F) and maximums reaching 27°C (82°F), while November sees much cooler conditions, with average temperatures dropping to just 5°C (42°F) and nighttime lows plummeting to -5°C (23°F). Precipitation-wise, September experiences 106 mm (4.2 in) over 9 days, compared to November's 84 mm (3.3 in) over a slightly longer stretch of 12 days. Additionally, humidity levels rise from 79% in September to 87% in November, contributing to a more damp and chilly environment in late fall. For more details, you can check Grand Haven weather in November.
September and December present a striking contrast in weather conditions. In September, temperatures range from a mild 9°C (48°F) to a warm 27°C (82°F), with an average of 19°C (66°F) and relatively high humidity at 79%. Rainfall is moderate, with 106 mm (4.2 in) spread over 9 days. In contrast, December brings a chillier climate, where temperatures drop significantly with a minimum of -13°C (9°F) and a maximum of 13°C (56°F), averaging just 2°C (35°F). Although precipitation is lower at 77 mm (3.0 in), it occurs over more days—12 days—resulting in an increased humidity level of 86%. For more on the specific conditions in December, check out Grand Haven weather in December.
As summer gracefully fades into fall, September in Grand Haven presents a delightful transition, characterized by milder temperatures and increased humidity. The days are warm yet comfortable, making it a perfect time for outdoor activities. While occasional rain may sweep through, the vibrant autumn foliage begins to emerge, adding a stunning backdrop to your adventures. This month stands out with its unique blend of warmth and freshness, making it distinct from the sweltering heat of the summer months and the chill of autumn that follows. For a deeper dive into the local weather patterns, explore Grand Haven Climate.