Portland Weather in May

What's the weather like in Portland (England) in May 2025?

The climate in Portland during May can be summarized as mild and reasonably dry.

May is in the spring in Portland and is typically the 6th warmest month of the year. Daytime maximum temperatures average around a cool 15°C (59°F), whilst at night 8°C (46°F) is normal.

Portland weather averages (imperial / metric)
Daytime temperature 14.8°C 58.6°F
Nightly temperature 7.6°C 45.7°F
Average temperature 11.2°C 52.2°F
Daily sunshine 7.8 hrs
Avg rainfall 55 mm 2.2 ins
Rainy days 13 days
Sea temperature 11.4°C 52.5°F
Humidity 83%
Windspeed 15.8kph 10 mph

On average May is the 4th driest month of the year in Portland with around 55mm 2.2 inches of rain making it a reasonably dry 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 7.8 hours of sunshine per day.

May temperatures in Portland

Portland average temperature in May

May rainfall

Portland average rain in May

May hourly sunshine

Portland average rain in May

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 Portland in May 2024.

Other monthly averages

Best places to visit in May

UV index Best time to go?

Portland weather stats

Portland weather statistics
Hottest month: August 19.6°C 67.3°F
Driest month: July 46mm 1.8ins
Sunniest month: July 8.1hrs
Coldest month: February 7.5°C 45.5°F
Wettest month: December 94mm 3.7ins
Map showing location of Portland (50.56748, -2.44472) Portland map pin © Google

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