Climate Insights for Dieppe

The climate in Dieppe is cool. The average annual temperature is 6°C and approximately 1103mm 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, June. The coldest months are January, February, December, 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 35°C difference between the coldest and warmest months. July is the warmest month, though highs remain moderate at 25°C with a mean of 20°C. The coldest month is January, when overnight lows fall to -10°C and the daily average is -6°C. On average, daily temperatures fluctuate by about 9°C between overnight lows and afternoon highs. The sharpest temperature change occurs between November and December, with a 6°C shift in average temperatures.

Dieppe is a moderately rainy area, receiving approximately 1103mm of precipitation annually, which averages out to around 92mm per month. The wettest month is November, averaging 121mm of rainfall. December and January also tend to see above-average precipitation. The driest month is July, with just 70mm. That's 51mm 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. Dieppe receives heavy snowfall, accumulating around 295cm annually from January through December. The snowiest month is February, with approximately 66cm. Winter travel should account for significant snow cover.

Dieppe 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 November, averaging 4km/h, though still comfortable for most outdoor activities. The calmest conditions occur in July, with average winds dropping to 3km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 1km/h between the calmest and windiest months.

It is currently summer in Dieppe, which began on June 21, 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 25°C, while the coldest stretch bottoms out in January near -10°C. Autumn is next, beginning on September 23, 2026 — 92 days from now.

The best time to visit Dieppe is during June, July and August, when the weather is most comfortable for travellers. During these months, average temperatures hover around 18°C with modest rainfall averaging 80mm per month. By contrast, January 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.