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Weather extremes

How extreme does Bayonne's weather get?

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

Based on 50+ years of daily weather observations (1971–present), from the San Sebastian - Igueldo station 50 km away. Updated through May 2026 — 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 Bayonne has recorded — each shown against what a normal day that time of year looks like.

🔥 Hottest day
103°F Jun 18, 2022

That is about 34°F hotter than a normal June afternoon in Bayonne (typical high near 69°F).

The three most extreme on record

1 103°F Jun 18, 2022recent
2 102°F Jul 23, 2019
3 102°F Jul 30, 2020
❄️ Coldest night
14°F Jan 6, 1985

About 29°F colder than a normal January night in Bayonne (typical low near 43°F).

The three most extreme on record

1 14°F Jan 6, 1985
2 18°F Jan 15, 1985
3 19°F Jan 8, 1985
🌧️ Most rain in one day
6.60 in May 31, 1997

More rain in a single day than Bayonne usually gets in the whole month of May (typical May total about 4.8 in).

The three most extreme on record

1 6.60 in May 31, 1997
2 5.32 in Oct 25, 1981
3 5.16 in Aug 23, 2007

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.

-10°10°30°50°70°90°110°130° all-time high 103°F JanFebMarAprMayJunJulAugSepOctNovDec
normal range of daily temperatureshottest ever recordedcoldest ever recorded

Bayonne's record heat sits well above even a hot day for the season — June's 103°F is about 34°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, Bayonne's warmest days reach the low 70s°F and its coldest nights drop to the low 40s°F. But across the record it has gone as high as 103°F and as low as 14°F. A single day has delivered over 7 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 Biarritz-pays-basque, a weather station, about 6 km from the city centre. The underlying daily records come from NOAA's global station network.

How we build these numbers →