Lille Weather by Month

Lille has a temperate oceanic climate (Koppen Cfb) with mild summers, cool winters, and rainfall spread evenly throughout the year. The city sits in northern France, just 15 km (9 miles) from the Belgian border, at an elevation of 21 metres (69 feet). Lille receives about 740 mm (29 inches) of rain annually across roughly 130 rain days, meaning you should expect some precipitation regardless of when you visit. The North Sea moderates temperatures but also brings persistent cloud cover, with Lille averaging only about 1,600 sunshine hours per year. July and August are the warmest months with average highs of 23°C (73°F), while January is the coldest with average lows of 1°C (34°F) and highs of 6°C (43°F). Snow is rare, typically accumulating only 2-3 days per year.

Lille Temperatures by Month

Winter temperatures in Lille hover just above freezing overnight. January averages 1°C to 6°C (34°F to 43°F), with February nearly identical at 1°C to 7°C (34°F to 45°F). March brings the first signs of spring, climbing to 3°C to 11°C (37°F to 52°F), and by April you can expect 5°C to 14°C (41°F to 57°F). May warms noticeably to 8°C to 18°C (46°F to 64°F), while summer peaks in July and August with average lows around 13°C (55°F) and highs reaching 23°C (73°F). September stays pleasant at 11°C to 19°C (52°F to 66°F), October cools to 8°C to 15°C (46°F to 59°F), and November drops to 4°C to 10°C (39°F to 50°F). December returns to winter values, averaging 1°C to 6°C (34°F to 43°F). Summer heatwaves can push temperatures above 30°C (86°F) for a few days, but this happens only once or twice per summer on average.

Lille Rainfall by Month

Rainfall in Lille is consistent year-round with no true dry season. November is typically the wettest month with about 70 mm (2.8 inches) of rain over 14 days. July and August see similar totals of about 65-70 mm (2.6-2.8 inches) but over fewer rain days (11-12), so summer rain often comes as heavier showers rather than persistent drizzle. The driest months are February and April, each averaging about 48 mm (1.9 inches). March and May both sit around 55 mm (2.2 inches). June, September, October, and December all record 60-65 mm (2.4-2.6 inches). January averages 60 mm (2.4 inches) over 13 days. Lille rarely experiences extreme rainfall events, with the maximum 24-hour rainfall on record being 63 mm set in August 2002.

Lille Sunshine and Humidity

Lille is not a sunny city by European standards. The city averages about 1,600 hours of sunshine annually, well below the French national average of 2,000 hours. December is the darkest month with just 45 hours of sun, while July brings the most at roughly 210 hours. Cloud cover is persistent, with Lille experiencing completely overcast skies on about 180 days per year. Humidity averages 80-85% year-round, highest in December (89%) and lowest in July (73%). The damp air can make winter temperatures feel colder than the thermometer suggests. Morning fog is common in autumn and winter, particularly in low-lying areas near the Deule River.

Lille Monthly Climate Table

For a more detailed seasonal breakdown and advice on when to plan your trip, read the best time to visit Lille guide.