Thief River Falls Weather in May

The climate in Thief River Falls during May can be summarized as mild and reasonably dry.

May is in the spring in Thief River Falls and is typically the 5th warmest month of the year. Daytime maximum temperatures average around a cool 20°C (68°F), whilst at night 5°C (41°F) is normal.

On average May is the 4th wettest month of the year in Thief River Falls with around 63mm 2.5 inches of rain making it a reasonably dry 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 9.5 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 Thief River Falls in May 2025.