Climate Insights for Portland

The climate in Portland is temperate. The average annual temperature is 14°C and approximately 781mm of precipitation falls per year. July is the wettest month, receiving around 125mm of rainfall. Portland is in the Southern Hemisphere. The seasons are reversed — summer runs from December to February, while winter falls between June and August. The summer months are: February, January, March. The coldest months are July, August, September, when temperatures can drop to 11°C.

Portland has relatively stable temperatures year-round, staying within a 7°C range. February is the warmest month, though highs remain moderate at 18°C with a mean of 17°C. July is the coolest month, with minimum temperatures around 11°C and an average of 12°C. Daily temperature variation is modest, with an average difference of 2°C between highs and lows.

Portland is a relatively dry area, receiving approximately 781mm of precipitation annually, which averages out to around 65mm per month. The wettest month is July, averaging 125mm of rainfall. August and June also tend to see above-average precipitation. The driest month is February, with just 23mm. That's 102mm less than July, the wettest month. Rainfall is heavily concentrated in certain months, creating a distinct wet and dry season. Visitors should plan around these patterns, as the difference between peak and low months is dramatic.

Portland is very windy, with an average annual wind speed of 35km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is July, averaging 41km/h, which can feel quite blustery and may affect outdoor activities. The calmest conditions occur in April, with average winds dropping to 32km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 9km/h between the calmest and windiest months. Wind tends to be stronger during winter months, driven by seasonal pressure systems. The seasonal averages break down to 39km/h in winter, 36km/h in spring, 33km/h in summer, 34km/h in autumn.

It is currently autumn in Portland, which began on March 20, 2026. Portland is in the Southern Hemisphere, where the seasons are reversed — spring starts in September, summer in December, autumn in March, and winter in June. The warmest period peaks in February at around 18°C, while the coldest stretch bottoms out in July near 11°C. Winter is next, beginning on June 21, 2026 — 88 days from now.

The best time to visit Portland is during January, February, March, April and December, when the weather is most comfortable for travellers. During these months, average temperatures hover around 16°C with modest rainfall averaging 35mm per month. By contrast, July can be quite cold with temperatures dropping to 11°C. A light rain jacket is recommended, though showers are generally brief and shouldn't disrupt your plans.

The table below shows monthly climate averages for Portland based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.