Saint Johnsbury Weather in May

The climate in Saint Johnsbury during May can be summarized as mild and a little damp.

May is in the spring in Saint Johnsbury and is typically the 5th warmest month of the year. Daytime maximum temperatures average around a cool 20°C (67°F), whilst at night 5°C (41°F) is normal.

On average May is the 5th wettest month of the year in Saint Johnsbury with around 89mm 3.5 inches of rain making it a a little damp time to visit. This rainfall is typically spread over 13 days, although this may vary considerably.

On the flip side this corresponds to an average of 8 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 Saint Johnsbury in May 2025.