Grand Haven Weather in August

What's the weather like in Grand Haven (Michigan) in August 2025?

The climate in Grand Haven during August can be summarized as warm, humid and a little damp.

August is in the summer in Grand Haven and is typically the 2nd warmest month of the year. Daytime maximum temperatures average around a muggy 26°C (79°F), whilst at night 15°C (60°F) is normal.

Grand Haven weather averages (imperial / metric)
Daytime temperature 26.3°C 79.3°F
Nightly temperature 15.3°C 59.5°F
Average temperature 20.8°C 69.4°F
Daily sunshine 9.5 hrs
Avg rainfall 84 mm 3.3 ins
Rainy days 9 days
Sea temperature 21.4°C 70.5°F
Humidity 75%
Windspeed 14.4kph 9 mph

On average August is the 2nd wettest month of the year in Grand Haven with around 84mm 3.3 inches of rain making it a a little damp time to visit. This rainfall is typically spread over 9 days, although this may vary considerably.

On the flip side this corresponds to an average of 9.5 hours of sunshine per day.

August temperatures in Grand Haven

Grand Haven average temperature in August

August rainfall

Grand Haven average rain in August

August hourly sunshine

Grand Haven average rain in August

The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Grand Haven in August 2025.

Other monthly averages

Best places to visit in August

UV index Best time to go?

Beta

Current (hourly) weather 15 day forecast

Grand Haven weather stats

Grand Haven weather statistics
Hottest month: July 27°C 80.6°F
Driest month: February 34mm 1.3ins
Sunniest month: July 10.7hrs
Coldest month: January -1.3°C 29.7°F
Wettest month: September 97mm 3.8ins
Map showing location of Grand Haven (43.06307, -86.22839) Grand Haven map pin © Google

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