Portland (MI) Weather & Climate: Best Time to Visit

The climate in Portland is known for significant temperature differences throughout the year, making the weather dynamic. Typically, average maximum daytime temperatures range from a comfortable 28°C (82°F) in July to a very cold -1°C (30°F) in the coolest month, January.

Nights vary from 16°C (61°F) in July to around -10°C (14°F) during the colder months.

Check out our detailed temperature page for more information.

Temperature ranges by month

Generally, Portland receives mid-range precipitation levels, with 929 mm (37 in) annually. The climate in Portland shows significant variation throughout the year. Expect high rainfall in August, the wettest month, with an average of 109 mm (4.3 in) of precipitation over 11 rainy days.

In contrast, the driest month February offers drier and sunnier days, with around 50 mm (2 in) of snowfall over 11 snowy days. For more details, please visit our Portland Precipitation page.

The mean monthly precipitation over the year, including rain, hail, and snow

The average number of days each month with precipitation

For those who appreciate different seasons, Portland serves as an ideal destination. Expect longer, more sun-filled days in July with an average of 10.6 hours of sunshine daily, and embrace the darker days in December, offering only 2.7 hours of daily sunlight.

Visit our detailed sunshine hours page for more information.

Monthly hours of sunshine

Daily hours of sunshine

Daily percentage of sunshine

The relative humidity is high throughout the year in Portland.

The city experiences its highest humidity in December, reaching 81%. In April, the humidity drops to its lowest level at 67%. What does this mean? Read our detailed page on humidity levels for further details.

Relative humidity over the year