Last updated: June 18, 2025
In September, the average temperature in Grand Haven, Canada hovers around 9°C (49°F). Expect a range from a chilly -8°C (18°F) to a warm 29°C (85°F). With 48 mm (1.9 in) of precipitation spread over 9 days, you might want to carry an umbrella. Additionally, the average humidity sits at a comfortable 83%.
In September in Grand Haven, the average temperature is 9°C (49°F). The maximum can reach 29°C (85°F), and the minimum can be as low as -8°C (18°F). Be prepared for a wide temperature range while traveling, as you'll need to pack for both warm and cold conditions.
In Grand Haven in September, the total precipitation amount is 48 mm (1.9 in) spread over 9 days.
In Grand Haven in September, humidity is 83%. With an average temperature of 9°C (49°F), this humidity feels like a damp blanket wrapping around you, making outdoor activities uncomfortable for traveling and requiring extra layers to stay warm and dry.
In Grand Haven in September, the maximum UV index reaches 5, which corresponds to a moderate Exposure Category. Under these conditions, the estimated time to burn is approximately 30 minutes. For more details, you can check the Hourly UV Index in Grand Haven.
UV Risk Categories
Weather in Grand Haven varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Grand Haven, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -11°C (12°F) | 26 mm (1.0 inches) | 94% | low |
| February Weather | -13°C (10°F) | 26 mm (1.0 inches) | 94% | low |
| March Weather | -6°C (22°F) | 32 mm (1.3 inches) | 89% | moderate |
| April Weather | 2°C (35°F) | 28 mm (1.1 inches) | 86% | moderate |
| May Weather | 10°C (51°F) | 44 mm (1.7 inches) | 82% | high |
| June Weather | 15°C (58°F) | 85 mm (3.3 inches) | 80% | high |
| July Weather | 16°C (61°F) | 94 mm (3.7 inches) | 83% | high |
| August Weather | 15°C (59°F) | 59 mm (2.3 inches) | 80% | high |
| September Weather | 9°C (49°F) | 48 mm (1.9 inches) | 83% | moderate |
| October Weather | 2°C (37°F) | 41 mm (1.6 inches) | 86% | moderate |
| November Weather | -6°C (21°F) | 50 mm (2.0 inches) | 91% | low |
| December Weather | -10°C (15°F) | 23 mm (0.9 inches) | 95% | low |