Climate Insights for Dieppe

The climate in Dieppe is cool. The average annual temperature is 7°C and approximately 1116mm of precipitation falls per year. Dieppe receives a notable amount of rainfall throughout the year, including during its driest month. Dieppe is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: July, August, September. The coldest months are February, January, March, when temperatures can drop to -10°C. Dieppe experiences heavy snowfall, typically from January through December.

Temperatures in Dieppe vary considerably across the year, with a 34°C difference between the coldest and warmest months. July is the warmest month, though highs remain moderate at 24°C with a mean of 20°C. The coldest month is February, when overnight lows fall to -10°C and the daily average is -6°C. Daily temperature variation is modest, with an average difference of 7°C between highs and lows. The sharpest temperature change occurs between October and November, with a 7°C shift in average temperatures.

Dieppe is a moderately rainy area, receiving approximately 1116mm of precipitation annually, which averages out to around 93mm per month. The wettest month is January, averaging 113mm of rainfall. November and December also tend to see above-average precipitation. The driest month is May, with just 71mm. 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. Dieppe receives heavy snowfall, accumulating around 208cm annually from January through December. The snowiest month is January, with approximately 51cm. Winter travel should account for significant snow cover.

Dieppe is moderately windy, with an average annual wind speed of 23km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is November, averaging 25km/h, noticeable enough to affect lighter outdoor activities. The calmest conditions occur in August, with average winds dropping to 19km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 6km/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 25km/h in winter, 23km/h in spring, 19km/h in summer, 23km/h in autumn.

It is currently spring in Dieppe, which began on March 20, 2026. Dieppe 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 -10°C. Summer is next, beginning on June 21, 2026 — 89 days from now.

The best time to visit Dieppe is during July, August and September, when the weather is most comfortable for travellers. During these months, average temperatures hover around 18°C with modest rainfall averaging 86mm per month. By contrast, February can be quite cold with temperatures dropping to -10°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 Dieppe 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.