Helena Weather in May

The climate in Helena during May can be summarized as warm and wet.

May is in the spring in Helena and is typically the 5th warmest month of the year. Daytime maximum temperatures average around a comfortable 27°C (81°F), whilst at night 16°C (60°F) is normal.

On average May is the wettest month of the year in Helena with around 136mm 5.3 inches of rain making it a wet 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 10.4 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 Helena in May 2024.