Portland Weather in May
What's the weather like in Portland (Victoria) in May 2025?
The climate in Portland during May can be summarized as mild and a little damp.
May is in the fall / autumn in Portland and is typically the 5th coldest month of the year. Daytime maximum temperatures average around a cool 16°C (61°F), whilst at night 9°C (48°F) is normal.
| Daytime temperature | 16.1°C 61°F |
|---|---|
| Nightly temperature | 9.1°C 48.4°F |
| Average temperature | 12.6°C 54.7°F |
| Daily sunshine | 4.7 hrs |
| Avg rainfall | 80 mm 3.2 ins |
| Rainy days | 10 days |
| Sea temperature | 15.6°C 60°F |
| Humidity | 74% |
| Windspeed | 21.6kph 14 mph |
On average May is the 4th wettest month of the year in Portland with around 80mm 3.2 inches of rain making it a a little damp 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 4.7 hours of sunshine per day.
May temperatures in Portland
May rainfall
May hourly sunshine
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 2025.
Other monthly averages
Portland weather stats
| Hottest month: | February | 23.2°C 73.8°F |
|---|---|---|
| Driest month: | February | 26mm 1ins |
| Sunniest month: | February | 9hrs |
| Coldest month: | July | 13.1°C 55.6°F |
| Wettest month: | July | 112mm 4.4ins |
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