Roscommon Weather in August

The climate in Roscommon during August can be summarized as warm and a little damp.

August is in the summer in Roscommon and is typically the 2nd warmest month of the year. Daytime maximum temperatures average around 25°C (76°F), whilst at night 12°C (54°F) is normal.

On average August is the 2nd wettest month of the year in Roscommon with around 86mm 3.4 inches of rain making it a a little damp time to visit. This rainfall is typically spread over 10 days, although this may vary considerably.

On the flip side this corresponds to an average of 9 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 Roscommon in August 2025.