Mild
Average highs are around 24°C, so days are mild rather than hot.
Weather Guide
San Sebastian, Spain Average Monthly Weather
Weather score32Poor annual avg
Best months: July, August, September
Across the year, average daytime temperatures are around 17°C, sunshine averages 4.8h per day, and rainfall totals about 1284mm. Sea temperatures average 17°C across the year.
Annual weather
Annual averages
Temp
17°C
Rain
1284mm
Annual total
Sun
4.8h
Sea
17°C
Weather score
32
Poor avg
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Showers
Rainfall averages 90mm, so some wet days are possible.
Some sun
Sunshine averages 6.5h per day, enough for a balanced month.
Swimmable
Sea temperatures average 22°C, which can work for swimming but may feel fresh.
Map
Weather map
Compare San Sebastian, Spain with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
August24°C average high
August is one of San Sebastian's warmest months, with daytime heat above the yearly average.
Warmest monthsJune to September
This stretch sets the upper range for average daytime heat.
Rain
August90mm average rain
August sits near San Sebastian's yearly rainfall average, so rain is a normal planning factor rather than an outlier.
Driest monthsJune to August
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
August6.5 hours average sun
August is brighter than San Sebastian's yearly average, though the strongest sunshine usually sits closer to the peak months.
Brightest monthsJune to August
This stretch has the strongest sunshine in the monthly averages.
Sea temperature
August22°C average sea
August is one of San Sebastian's warmest sea months, when swimming comfort is usually strongest.
Warmest seaJuly to September
Sea temperatures are usually near 21°C in this stretch, so swimming comfort is at its strongest.
Weather score
August58 weather score
August is one of San Sebastian's best weather-score months, combining the strongest overall balance in the yearly averages.
Best weather monthsJune to September
These months have the strongest weather score in the monthly averages.
