Climate Insights for Sussex

The climate in Sussex is cool. The average annual temperature is 6°C and approximately 1198mm of precipitation falls per year. Sussex receives a notable amount of rainfall throughout the year, including during its driest month. Sussex 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 February, January, December, when temperatures can drop to -11°C. Snowfall occurs from January to December, with around 197cm accumulating over the season.

Temperatures in Sussex vary considerably across the year, with a 35°C difference between the coldest and warmest months. July is the warmest month, though highs remain moderate at 24°C with a mean of 19°C. The coldest month is February, when overnight lows fall to -11°C and the daily average is -6°C. On average, daily temperatures fluctuate by about 10°C between overnight lows and afternoon highs. The sharpest temperature change occurs between March and April, with a 6°C shift in average temperatures.

Sussex is a moderately rainy area, receiving approximately 1198mm of precipitation annually, which averages out to around 100mm per month. The wettest month is January, averaging 120mm of rainfall. November and December also tend to see above-average precipitation. The driest month is May, with just 79mm. That's 42mm less than January, the wettest month. Rainfall is relatively evenly distributed throughout the year, so there is no pronounced dry or wet season to plan around. Snowfall is a regular feature from January to December, with around 197cm accumulating over the season. February typically sees the most snow at around 48cm.

Sussex is mildly breezy, with an average annual wind speed of 18km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is March, averaging 20km/h, noticeable enough to affect lighter outdoor activities. The calmest conditions occur in August, with average winds dropping to 15km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 5km/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 20km/h in winter, 19km/h in spring, 16km/h in summer, 18km/h in autumn.

It is currently spring in Sussex, which began on March 20, 2026. Sussex 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 24°C, while the coldest stretch bottoms out in February near -11°C. Summer is next, beginning on June 21, 2026 — 88 days from now.

The best time to visit Sussex is during July and August, when the weather is most comfortable for travellers. During these months, average temperatures hover around 19°C with modest rainfall averaging 91mm per month. By contrast, February can be quite cold with temperatures dropping to -11°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 Sussex 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.