Best months to marry on the Basque coast

June and September are the two most recommended months for a Basque coast wedding. June gives long evenings and a coast that has not yet filled with August crowds. September holds the warmth, with Atlantic water still near 21°C, and thins hotel demand once schools go back.

Temperature, sea and rain-day figures below are climate normals [VERIFY: source and reference period, such as Météo-France and AEMET]. Weather, price and crowd size move together, and they move by month.

Month	Biarritz high	San Sebastián high	Sea	Rain	Watch
May	4 to 5°C below the August peak	4 to 5°C below the August peak	Cool	About 10 days	Easier to book
June	21.5°C	20.2°C	About 19°C	8 to 10 days	Fêtes de Saint-Jean-de-Luz, 24 to 27 June 2027
July	Low 20s	Low 20s	About 21.5°C	8 to 10 days	Fêtes de Bayonne, 14 to 18 July 2027
August	23.6°C	Warmest month	About 22.2°C	8 to 10 days	Semana Grande, 14 to 21 August 2027
September	22°C	20.9°C	Near 21°C	8 to 10 days	Film festival, second half [VERIFY: 2027 dates]. Hondarribia fiestas, 7 to 11 September
October	4 to 5°C below the August peak	4 to 5°C below the August peak	Cooling	About 10 days, then more	Indoor plan by mid-month
November	Short days	Short days	Cold	Heaviest month	Indoor venues only

June, the reliable start

Biarritz averages a high of 21.5°C in June, San Sebastián 20.2°C, both mild enough for a terrace dinner without a heater. The Atlantic reaches about 19°C, warm enough for guests who want to swim before the ceremony. Count on 8 to 10 rainy days a month in summer, more from October, so a wet-weather plan still matters. Hotels are easier to book than July or August, and the town has not yet filled with its own summer visitors. We hear June most often from planners on this coast.

July, watch the Bayonne calendar

Temperatures climb toward the low 20s and the water follows, averaging close to 21.5°C by month’s end. The complication in July is crowds. The Fêtes de Bayonne run from 14 to 18 July 2027 [VERIFY: Ville de Bayonne programme], in Bayonne, about 7 kilometres from Biarritz. Hotels across the wider area fill, taxis get scarce, and roads slow for those days, even for a wedding with no connection to the festival. Couples who love the idea can lean into it. Most pick a date outside that window.

August, the hottest and busiest

August is the warmest month on record for both towns, with Biarritz averaging a high of 23.6°C and the sea at its yearly peak of about 22.2°C. It is also the most expensive and least available month for venues, hotels and planners, which is why the ranges in what a Basque coast wedding costs move so far in August. Semana Grande, San Sebastián’s Aste Nagusia, runs from 14 to 21 August 2027, with nightly fireworks over the bay. A wedding timed around the fireworks can be spectacular. A wedding that needs the streets clear should look at a different week.

September, the local’s pick

September holds most of August’s warmth, Biarritz averages 22°C, San Sebastián 20.9°C, with water still near 21°C, while the crowds thin once French and Spanish schools reopen after the first week. San Sebastián’s International Film Festival usually falls in the second half of September [VERIFY: 2027 dates] and fills the city’s hotels that week. Hondarribia’s main fiestas run from 7 to 11 September, with the Alarde on 8 September, so a Hondarribia wedding in September needs to sit outside that week. The first two weeks of September, away from Hondarribia, or the last days of the month, avoid both. We hear September most often as the month planners on this coast prefer.

May and October, the shoulder months

Both months run 4 to 5 degrees cooler than the summer peak, with about 10 rainy days each across the two towns. They also cost less and book more easily. A peak Saturday often needs a year of notice. May can be booked with a few months. May suits a garden ceremony. Swimming is unlikely. October can be clear, with long light in the afternoon, and an indoor plan is worth having by mid-month.

November to April, the off season

Rain is heaviest in November on both sides of the border, and daylight is short. This is the range for an indoor wedding: a hotel ballroom, a restaurant private room, or a fireplace. Venue and catering rates drop, and the properties that are booked a year out in June will often answer within days in February. Expect an indoor day with short light.

The trade-off in one paragraph

Warmth and crowds rise together from May to August, then both fall away through September and October. Four dates move prices on their own: the Fêtes de Bayonne from 14 to 18 July 2027, Semana Grande from 14 to 21 August 2027, Hondarribia’s fiestas from 7 to 11 September, and the San Sebastián film festival in the second half of September [VERIFY: 2027 dates]. Once you have a year in mind, tell us the month you are leaning toward and we will flag anything on the calendar that could work for or against that date.

Sources

• Climate normals in the table: [VERIFY: Météo-France and AEMET series, and the reference period].
• Fêtes de Bayonne, 14 to 18 July 2027: [VERIFY: Ville de Bayonne programme].
• Semana Grande, 14 to 21 August 2027, and Fêtes de Saint-Jean-de-Luz, 24 to 27 June 2027, as used on this site.
• Hondarribia fiestas, 7 to 11 September: Hondarribia town site.
• San Sebastián International Film Festival 2027: [VERIFY: dates].