How extreme does Boulogne-sur-Mer's weather get?

The hottest, coldest, wettest and snowiest days Boulogne-sur-Mer has recorded — the outer limits of what its weather can do, and how far they sit beyond a normal day.

Based on 34 years of daily weather observations (1991–present), from the Boulogne station 1 km away. Updated through January 2025 — an all-time extreme only changes when a more extreme day actually occurs, so some dates are old. That is normal, not stale data.

The four kinds of extreme

The hottest, coldest, wettest and snowiest single days Boulogne-sur-Mer has recorded — each shown against what a normal day that time of year looks like.

🔥 Hottest day

103°F Jul 19, 2022

That is about 35°F hotter than a normal July afternoon in Boulogne-sur-Mer (typical high near 69°F).

The three most extreme on record

1 103°F Jul 19, 2022recent

2 100°F Jul 31, 2020

3 98°F Jul 25, 2019

❄️ Coldest night

10°F Feb 7, 1991

About 28°F colder than a normal February night in Boulogne-sur-Mer (typical low near 38°F).

The three most extreme on record

1 10°F Feb 7, 1991

2 10°F Jan 2, 1997

3 12°F Jan 1, 1997

🌧️ Most rain in one day

2.63 in Aug 1, 2024

More rain in a single day than Boulogne-sur-Mer usually gets in the whole month of August (typical August total about 2.1 in).

The three most extreme on record

1 2.63 in Aug 1, 2024recent

2 2.06 in Nov 5, 2019

3 1.96 in Sep 8, 2022

How hot and cold it gets, month by month

The shaded band is the normal range of daily temperatures for each month. The dots show the most extreme it has ever been — so you can see how far beyond a normal day the records really sit.

normal range of daily temperatureshottest ever recordedcoldest ever recorded

Boulogne-sur-Mer's record heat sits well above even a hot day for the season — July's 103°F is about 35°F beyond a normal hot afternoon. Its record cold is just as far below a normal winter night — the dots mark how rare each extreme really is.

In plain terms

In a normal year, Boulogne-sur-Mer's warmest days reach the low 70s°F and its coldest nights drop to the high 30s°F. But across the record it has gone as high as 103°F and as low as 10°F. A single day has delivered over 3 inches of rain. Those are the outer edges worth knowing if you are moving here, planning a trip, or thinking about a house.

Methodology & sources

Temperature & precipitation — 1991–2020 normals computed from 30 years of daily observations at Boulogne, a weather station, about 1 km from the city centre. The underlying daily records come from NOAA's global station network.

How we build these numbers →

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