Climate Insights for Portola

The climate in Portola is cool. The average annual temperature is 9°C and approximately 854mm of precipitation falls per year. January is the wettest month, receiving around 177mm of rainfall. Portola is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: July, August, June. The coldest months are December, February, January, when temperatures can drop to -7°C. Portola experiences heavy snowfall, typically from January through December.

Portola has a wide annual temperature range, spanning 38°C from the coldest to warmest months. The warmest month is July, when average highs reach 31°C and the mean temperature sits around 22°C. The coldest month is December, when overnight lows fall to -7°C and the daily average is -2°C. On average, daily temperatures fluctuate by about 15°C between overnight lows and afternoon highs. The sharpest temperature change occurs between September and October, with a 7°C shift in average temperatures.

Portola is a moderately rainy area, receiving approximately 854mm of precipitation annually, which averages out to around 71mm per month. The wettest month is January, averaging 177mm of rainfall. March and February also tend to see above-average precipitation. The driest month is July, with just 9mm. That's 168mm less than January, 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. Portola receives heavy snowfall, accumulating around 417cm annually from January through December. The snowiest month is January, with approximately 115cm. Winter travel should account for significant snow cover.

Portola is relatively calm, with an average annual wind speed of 2km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is June, averaging 2km/h, though still comfortable for most outdoor activities. The calmest conditions occur in August, with average winds dropping to 2km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 0km/h between the calmest and windiest months.

It is currently summer in Portola, which began on June 21, 2026. Portola is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in July at around 31°C, while the coldest stretch bottoms out in December near -7°C. Autumn is next, beginning on September 23, 2026 — 76 days from now.

The best time to visit Portola is during June, July, August and September, when the weather is most comfortable for travellers. During these months, average temperatures hover around 19°C with modest rainfall averaging 12mm per month. By contrast, December can be quite cold with temperatures dropping to -7°C. With minimal rainfall expected, you can pack light and plan outdoor activities with confidence.

The table below shows monthly climate averages for Portola 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. Snow is measured in centimetres (cm) and reflects average monthly snowfall accumulation. 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.