Portland Weather in December
What's the weather like in Portland (Victoria) in December 2025?
The climate in Portland during December can be summarized as mild and reasonably dry.
December is in the summer in Portland and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a comfortable 21°C (70°F), whilst at night 12°C (53°F) is normal.
| Daytime temperature | 20.9°C 69.6°F |
|---|---|
| Nightly temperature | 11.5°C 52.7°F |
| Average temperature | 16.2°C 61.2°F |
| Daily sunshine | 8.4 hrs |
| Avg rainfall | 45 mm 1.8 ins |
| Rainy days | 8 days |
| Sea temperature | 15.9°C 60.7°F |
| Humidity | 55% |
| Windspeed | 23kph 14 mph |
On average December is the 4th driest month of the year in Portland with around 45mm 1.8 inches of rain making it a reasonably dry time to visit. This rainfall is typically spread over 8 days, although this may vary considerably.
On the flip side this corresponds to an average of 8.4 hours of sunshine per day.
December temperatures in Portland
December rainfall
December 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 December 2025.
Other monthly averages
Best places to visit in December
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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