Portland (MI) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Portland.
Climate overview of Portland
Temperatures in Portland, Michigan, United States of America, vary greatly throughout the year. July is the hottest month at 28°C (82°F), while January is the coldest at -1°C (30°F).
With around 929 mm (37 in) of annual rain/snowfall, the city has moderate precipitation levels. August is the wettest month and February the driest. It also has warm summers and very cold winters. July is the sunniest month, averaging 10.6 hours of sunshine per day.
Portland Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Portland - and find the best time to visit.
Monthly Temperature in Portland
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
Rainfall in Portland
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
Sunshine Hours in Portland
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
Humidity in Portland by Month
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
Best Time to Visit Portland
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: June, July and September
- Warmest weather: July and August
- Most sunshine: July
- Seasonal pattern: Warm summers and very cold winters
- Coldest conditions: January, with freezing nights around -10°C (14°F).
Frequently asked questions about the climate in Portland
What is the best time to visit Portland?
June, July and September typically offer the most optimal weather in Portland. In contrast, January, February, March, November and December tend to have less optimal conditions. Portland has warm summers and very cold winters.
What temperatures can I expect in Portland?
Daytime highs range from -1°C (30°F) in January to 28°C (82°F) in July. Nighttime lows range from -10°C (14°F) to 16°C (61°F). Temperatures vary considerably through the year.
How much rain does Portland get?
Annual rainfall is around 929 mm (37 in). August is the wettest month with 109 mm (4.3 in), while February is the driest with 50 mm (2 in).
How sunny is Portland?
Portland receives around 2,393 hours of sunshine per year. July is the sunniest month with 318 hours, while December is the cloudiest with just 82 hours. Overall, Portland enjoys abundant sunshine.
Portland 3-Day Forecast
Portland (MI) 3-Day Forecast
Portland on the map
Portland is highlighted - select any city to see its climate.
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