Monthly climate guide
San Sebastián weather in May
With highs near 18°C (64°F) and lows around 13°C (55°F), May feels mild in San Sebastián. Rainfall averages about 91 mm (wet) and the sky is often cloudy. Daytime highs are 2°C warmer than April and 3°C cooler than June.
What stands out in May
- There's little difference between day and night (around 5°C).
- Just 100 km apart, but San Sebastián runs about 2°C cooler than Sangüesa/Zangoza this month.
- May brings late spring to San Sebastián.
Avg high
18°C
64°F
Avg low
13°C
55°F
Rainfall
91 mm
wet
Humidity
81%
relative
Sky
72%
cloud · often cloudy
San Sebastián weather by month
Show the monthly averages as a table
| Month | Avg high | Avg low | Rain | Humidity | Cloud cover |
|---|---|---|---|---|---|
| January | 11°C / 52°F | 8°C / 46°F | 151 mm | 83% | 78% |
| February | 11°C / 52°F | 7°C / 45°F | 121 mm | 81% | 71% |
| March | 13°C / 56°F | 9°C / 47°F | 101 mm | 81% | 70% |
| April | 15°C / 59°F | 11°C / 51°F | 97 mm | 80% | 71% |
| May | 18°C / 64°F | 13°C / 55°F | 91 mm | 81% | 72% |
| June | 21°C / 69°F | 16°C / 60°F | 85 mm | 81% | 69% |
| July | 23°C / 73°F | 18°C / 65°F | 61 mm | 80% | 65% |
| August | 24°C / 75°F | 19°C / 65°F | 47 mm | 77% | 65% |
| September | 22°C / 72°F | 17°C / 63°F | 62 mm | 76% | 63% |
| October | 19°C / 67°F | 15°C / 58°F | 89 mm | 77% | 68% |
| November | 15°C / 59°F | 11°C / 52°F | 160 mm | 81% | 76% |
| December | 13°C / 55°F | 9°C / 48°F | 129 mm | 82% | 75% |
What to pack for May
- A warm sweater or fleece for layering
- A mid-weight jacket
- A compact umbrella or packable rain jacket
- Water-resistant shoes
Is May a good time to visit San Sebastián?
Compare the months in the chart above to find your ideal window.
Best time to visit San Sebastián →Other Spain cities in May
Cite or embed this data
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San Sebastián weather in May. WeatherCompare, 2026 (NASA POWER / ERA5, 2011–2020 monthly averages). https://weathercompare.eu/weather/spain/san-sebastian/may
<a href="https://weathercompare.eu/weather/spain/san-sebastian/may">San Sebastián weather in May</a> (WeatherCompare)
<iframe src="https://weathercompare.eu/embed/spain/san-sebastian" width="300" height="160" style="border:0;border-radius:12px" loading="lazy" title="San Sebastián weather in May"></iframe> <p style="font-size:12px"><a href="https://weathercompare.eu/weather/spain/san-sebastian/may">San Sebastián weather in May</a> – WeatherCompare</p>
San Sebastián in May: quick answers
Is May a good time to visit San Sebastián?
May is one of the wetter months in San Sebastián, with about 91 mm of rain. You can still go: pack a rain jacket and keep plans flexible.
How warm is San Sebastián in May?
Average highs are about 18°C (64°F) and average lows about 13°C (55°F), based on 10 years of daily data.
Does it rain a lot in San Sebastián in May?
San Sebastián typically gets around 91 mm of rain in May — wet.
Figures are long-term averages for the area around San Sebastián (NASA POWER / ERA5, 2011–2020), not a forecast for a specific year. For upcoming days, see the live multi-source forecast.