Mason City Weather in August

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

August is in the summer in Mason City and is typically the 2nd warmest month of the year. Daytime maximum temperatures average around a muggy 27°C (81°F), whilst at night 15°C (58°F) is normal.

On average August is the 4th wettest month of the year in Mason City with around 98mm 3.8 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 10 hours of sunshine per day.

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 Mason City in August 2025.