San Sebastián vs Biarritz: which is sunnier?
🇪🇸 Spain vs 🇫🇷 France · 25 km apart · long-term climate normals (NASA POWER, 2001–2020)
San Sebastián and Biarritz are virtually tied for annual sunshine — about 2,077 vs 2,077 hours a year. San Sebastián has the higher Sunshine Score in 4 of 12 months, Biarritz in 2 (6 within 2 points).
Scores are the 0–100 Sunshine Score — sunshine, daytime warmth and dryness in one number, per month.
At a glance
| San Sebastián | Biarritz | |
|---|---|---|
| Sunshine hours / year | 2,077 | 2,077 |
| Sunniest month | July (82/100) | July (82/100) |
| Nov–Feb average score | 27/100 | 22/100 |
| Jun–Aug average score | 81/100 | 80/100 |
| Rain / year | 1,070 mm | 1,069 mm |
| Warmest sea | 23°C / 73°F | 24°C / 75°F |
| Peak midday UV | 7 (high) | 7 (high) |
San Sebastián vs Biarritz month by month
| Month | Sunshine Score | Day high °C | Rain mm | Sea °C | ||||
|---|---|---|---|---|---|---|---|---|
| San Sebastián | Biarritz | San Sebastián | Biarritz | San Sebastián | Biarritz | San Sebastián | Biarritz | |
| January | 23 | 17 | 12° | 11° | 126 | 121 | 14° | 13° |
| February | 24 | 19 | 12° | 11° | 95 | 90 | 14° | 13° |
| March | 37 | 37 | 14° | 14° | 90 | 89 | 14° | 13° |
| April | 50 | 56 | 16° | 17° | 86 | 89 | 15° | 15° |
| May | 63 | 75 | 18° | 20° | 82 | 89 | 17° | 17° |
| June | 78 | 77 | 22° | 24° | 68 | 73 | 20° | 20° |
| July | 82 | 82 | 23° | 26° | 48 | 51 | 22° | 23° |
| August | 82 | 81 | 24° | 27° | 51 | 53 | 23° | 24° |
| September | 79 | 79 | 22° | 25° | 64 | 65 | 21° | 22° |
| October | 74 | 74 | 20° | 20° | 94 | 93 | 19° | 19° |
| November | 37 | 32 | 15° | 14° | 149 | 144 | 17° | 17° |
| December | 23 | 18 | 12° | 11° | 117 | 112 | 15° | 14° |
The sunnier month by month: Jan San Sebastián · Feb San Sebastián · Mar even · Apr Biarritz · May Biarritz · Jun even · Jul even · Aug even · Sep even · Oct even · Nov San Sebastián · Dec San Sebastián.
When to pick which
- November–February: San Sebastián (average score 27/100 vs 22). Daytime highs are similar (13°C vs 12°C). See the winter sun ranking.
- March–May: Biarritz (average score 56/100 vs 50). Daytime highs are similar (16°C vs 17°C).
- June–August: too close to call — San Sebastián averages 81/100, Biarritz 80/100. Biarritz is the warmer, around 26°C daytime highs vs 23°C.
- September–October: too close to call — San Sebastián averages 77/100, Biarritz 77/100. Biarritz is the warmer, around 23°C daytime highs vs 21°C.
Sea temperature
Biarritz's sea gets warmer: 24°C / 75°F at its peak vs 23°C. Swimmable water (21°C+): San Sebastián about 3 months a year, Biarritz about 3 months a year. Month-by-month sea temperatures are in the table above.
Full month-by-month guides: San Sebastián weather by month · Biarritz weather by month · Best time to visit Spain · Best time to visit France.
More comparisons: San Sebastián vs Bilbao · San Sebastián vs Vitoria-Gasteiz · San Sebastián vs Santander · Biarritz vs Bilbao · Biarritz vs Bordeaux · Biarritz vs Pau/Pyrénées (Uzein) · all head-to-heads