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Regulars call this normally the driest month of the year here on paper, warm and agreeable in the mid-to-late 20s Celsius, while being honest that the Atlantic coast setting means rain can still arrive any time regardless of the seasonal odds. Our row backs that warm, genuinely humid read, 27.4C reading as a hot 29C, over 16.9C nights, with 54mm of rain across 7.5 days and humidity at 80 percent. Regulars are consistent that a rain layer belongs in the bag even on what looks like a reliably warm week, since the region's unpredictability doesn't fully disappear even in its best month. The sea sits at a swimmable 22.9C, a real highlight for anyone splitting time with San Sebastian's beaches. The record: 11.1 hours of sun, a 15.8 kph wind and AQI 41.

Forum posters describe January in Biarritz as similar to December, cold around 10-12C and potentially wet and windy, though posters note there's usually at least a day or two of notably milder weather within any given winter stretch. Posters are direct that winter here is actually the driest season overall, with long, dry, sunny spells a genuine feature of the Basque coast's mild oceanic climate, even as a visitor could just as easily get lucky with 15-17C days or unlucky with persistent driving rain off the Atlantic. Posters consistently describe Biarritz as very much a summer tourist town, but note the roughly 40,000 year-round residents and a university in nearby Bayonne keep plenty of restaurants and shops open through the quieter winter months. Posters generally rate January as cool, changeable but genuinely livable, with real chances of both pleasant and rough weather days.

June to August is Biarritz's best weather and its high season together. July averages near 24°C, and the sea is warm enough that the forum says you can often surf in shorts by mid-month, with some days not needing a wetsuit at all — they put the water at 20–21°C, the record a little higher. The honest caveat is that the weather is temperamental: a couple of really nice days, then rain, then a couple more, with afternoon thunderstorms in the mix, against seven wet days on the record. The rocky coastline is the surf advantage here — the breaks vary with the wind, so something is usually working.