San Sebastián Weather in May
San Sebastián in May sees pleasant temperatures, with highs around 18°C (64°F) and overnight lows of 12°C (54°F). Rainfall is fairly high at around 116 mm (4.6 in) on average, so pack waterproofs just in case.
Rainfall in San Sebastián in May
Past climate data indicates that roughly 17 days will see rain, totalling around 116 mm (4.6 in) for the month. Rain falls regularly this month and can be quite heavy when it does. Showers can be substantial, so waterproof gear is a good idea.
Temperature in San Sebastián in May
In May, expect pleasant temperatures in San Sebastián, with highs of 18°C (64°F) and lows of 12°C (54°F) at night. This creates a mild day-to-night pattern that is generally easy to manage with the right clothing. With overnight lows of 12°C (54°F), evenings can feel noticeably cooler than the daytime. An extra layer is a good idea, though the cool air makes for a good night's sleep.
Sunshine in San Sebastián in May
With about 182 hours of sunshine, the area enjoys a nice balance of sun and overcast, creating a pleasant environment.If your ideal day consists of dry skies and pleasant temperatures, June, July and August typically offer the best circumstances for San Sebastián.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Spain, check out our San Sebastián's climate page.
San Sebastián Temperature in May
Min Temperature
12°C (54°F)
Max Temperature
18°C (64°F)
Chance of Rain
55%
Precipitation
116 mm (4.6 in)
Rainy days
17 days
Humidity
72%
Sunshine
182 hours
Percentage Sunshine
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in San Sebastián typically stay consistent throughout May, with daily highs averaging around 18°C (64°F). Nights are cool, with lows typically ranging from 9°C (48°F) to 13°C (55°F).
Average temperatures in May
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in May
Historical weather for San Sebastián in May
Browse day-by-day weather records for San Sebastián spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
San Sebastián historical weather extremes in May
Based on 50 years of weather observations in San Sebastián between 1976 and 2026, these are the recorded extremes.
- The warmest day in May was on May 26, 2026, with a maximum of 35°C (95°F).
- On May 5, 1991, San Sebastián saw its coldest May day with temperatures maxing out at 10°C (50°F).
- San Sebastián registered its coldest May night on May 13, 1996, with temperatures dropping to -2°C (28°F).
Best Places in Spain in May
Find out more about the weather in Spain and which places have the best travel conditions in this month. See all of Spain in May →
perfect weather
pleasant
tolerable
unpleasant
poor
What to Wear in San Sebastián in May
For San Sebastián in May, you'll want flexible clothing. It's wise to pack cotton shirts, comfortable shorts, and a pair of jeans for cooler evenings. A light sweater or jacket is useful for air-conditioned spaces (like buses) or unexpected cool moments. High rain levels are expected, so pack waterproof gear and an umbrella or poncho. Bring sunglasses since you'll have some sunny periods throughout the monthWhat To Do in San Sebastián in May
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Spain, check out our San Sebastián's climate page.
Temperature Rainfall Sunshine Humidity
See the full San Sebastián climate overview or explore weather in Spain.
