Climate Insights for St Austell

The climate in St Austell is temperate. The average annual temperature is 12°C and approximately 984mm of precipitation falls per year. St Austell receives a notable amount of rainfall throughout the year, including during its driest month. St Austell 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 January, February, March, when temperatures can drop to 6°C.

St Austell sees moderate temperature variation throughout the year, ranging from 6°C to 20°C. July is the warmest month, though highs remain moderate at 20°C with a mean of 17°C. January is the coolest month, with minimum temperatures around 6°C and an average of 8°C. Daily temperature variation is modest, with an average difference of 4°C between highs and lows. The sharpest temperature change occurs between April and May, with a 3°C shift in average temperatures.

St Austell is a moderately rainy area, receiving approximately 984mm of precipitation annually, which averages out to around 82mm per month. The wettest month is November, averaging 108mm of rainfall. December and October also tend to see above-average precipitation. The driest month is May, with just 61mm. That's 48mm less than November, the wettest month. Rainfall is relatively evenly distributed throughout the year, so there is no pronounced dry or wet season to plan around.

St Austell is mildly breezy, with an average annual wind speed of 20km/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 24km/h, noticeable enough to affect lighter outdoor activities. The calmest conditions occur in June, with average winds dropping to 17km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 7km/h gap 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 23km/h in winter, 19km/h in spring, 17km/h in summer, 20km/h in autumn.

It is currently summer in St Austell, which began on June 21, 2026. St Austell 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 20°C, while the coldest stretch bottoms out in January near 6°C. Autumn is next, beginning on September 23, 2026 (9 days from now).

The best time to visit St Austell is during June, July, August and September, when the weather is most comfortable for travellers. During these months, average temperatures hover around 16°C with modest rainfall averaging 70mm per month. By contrast, January can be quite cold with temperatures dropping to 6°C. Despite being the best months overall, some rain is still likely. Pack a waterproof layer and plan a mix of indoor and outdoor activities.

The table below shows monthly climate averages for St Austell 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.