Climate Insights for Portishead

The climate in Portishead is temperate. The average annual temperature is 11°C and approximately 798mm of precipitation falls per year. November is the wettest month, receiving around 107mm of rainfall. Portishead is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: August, July, September. The coldest months are February, March, November, when temperatures can drop to 3°C.

Portishead sees moderate temperature variation throughout the year, ranging from 3°C to 21°C. August is the warmest month, though highs remain moderate at 21°C with a mean of 17°C. February is the coolest month, with minimum temperatures around 3°C and an average of 6°C. Daily temperature variation is modest, with an average difference of 6°C between highs and lows. The sharpest temperature change occurs between September and October, with a 5°C shift in average temperatures.

Portishead is a relatively dry area, receiving approximately 798mm of precipitation annually, which averages out to around 67mm per month. The wettest month is November, averaging 107mm of rainfall. January and March also tend to see above-average precipitation. The driest month is July, with just 27mm. That's 80mm less than November, the wettest month. Precipitation varies noticeably between seasons, with the first half (January to June) of the year generally seeing more rainfall.

Portishead is relatively calm, with an average annual wind speed of 4km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is February, averaging 6km/h, though still comfortable for most outdoor activities. The calmest conditions occur in December, with average winds dropping to 4km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 2km/h gap between the calmest and windiest months.

It is currently summer in Portishead, which began on June 21, 2026. Portishead 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 August at around 21°C, while the coldest stretch bottoms out in February near 3°C. Autumn is next, beginning on September 23, 2026 — 52 days from now.

The best time to visit Portishead is during June, July, August and September, when the weather is most comfortable for travellers. During these months, average temperatures hover around 17°C with modest rainfall averaging 60mm per month. By contrast, February can be quite cold with temperatures dropping to 3°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 Portishead 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.