Best time to visit Donostia / San Sebastián
The best time to visit Donostia / San Sebastián is July, judged on twenty years of weather records and the events worth going for.
Donostia / San Sebastián, Basque Country, Spain
°C
mm
- Average daily high and low
- Precipitation
- Good month
- Best month
- Made good or best by an event
| Month | Average daily high | Average daily low | Precipitation | Verdict |
|---|---|---|---|---|
| January | 10.3 °C / 51 °F | 5.8 °C / 42 °F | 158 mm / 6.2 in | neither best nor good |
| February | 11.3 °C / 52 °F | 6.1 °C / 43 °F | 131 mm / 5.2 in | neither best nor good |
| March | 12.9 °C / 55 °F | 7.4 °C / 45 °F | 135 mm / 5.3 in | neither best nor good |
| April | 14.8 °C / 59 °F | 9.2 °C / 49 °F | 110 mm / 4.3 in | neither best nor good |
| May | 17.1 °C / 63 °F | 11.5 °C / 53 °F | 117 mm / 4.6 in | good month |
| June | 20.4 °C / 69 °F | 14.7 °C / 58 °F | 110 mm / 4.3 in | good month |
| July | 22.2 °C / 72 °F | 16.5 °C / 62 °F | 68 mm / 2.7 in | best month |
| August | 22.7 °C / 73 °F | 16.7 °C / 62 °F | 83 mm / 3.3 in | good month |
| September | 21.1 °C / 70 °F | 15 °C / 59 °F | 97 mm / 3.8 in | good month |
| October | 18.6 °C / 65 °F | 12.8 °C / 55 °F | 116 mm / 4.5 in | good month |
| November | 13.9 °C / 57 °F | 9.3 °C / 49 °F | 186 mm / 7.3 in | neither best nor good |
| December | 11.5 °C / 53 °F | 7 °C / 45 °F | 141 mm / 5.6 in | neither best nor good |
Good and best months depend on more than temperature, rain and events. How they are chosen
Each activity on this page has its own good and best months, rated on twenty years of daily weather records. Which measures count, and how much, depends on the activity: humidity for exploring outdoors, wind for the beach, hiking and skiing, snow for skiing alone. Between them, the activities are rated on:
- Daytime highs
- Night-time lows
- How warm it feels
- Humidity
- How much of the day is sunny
- Hours of daylight
- Monthly rainfall
- How many days it rains
- Days of heavy rain
- Wind
- Snowfall and days with snow
- Major events, such as festivals
The chart shows the good and best months for exploring outdoors.
The event icon marks a month that an event lifts to good or best, such as a festival or a natural spectacle. Choose “Weather only” in the toolbar to rate the months on weather alone.
Best months by activity
Exploring outdoors
Mild days and nights, mostly dry and bright. The default for 'when should I go'.
- JJanuary: neither
- FFebruary: neither
- MMarch: neither
- AApril: neither
- MMay: good
- JJune: good
- JJuly: best
- AAugust: good
- SSeptember: good
- OOctober: good
- NNovember: neither
- DDecember: neither
- Best
- July
- Good
- May–June, August–October
Why these months
May · good
In its favour: feels like (high) 16.8 °C / 62 °F, share of daylight that is sunny 73%, average daily high 17.1 °C / 63 °F, precipitation 117 mm / 4.6 in, average daily low 11.5 °C / 53 °F, days with heavy rain 3.5 days.
Against: wet days 16.4 days, relative humidity 80%.
June · good
In its favour: feels like (high) 21.4 °C / 71 °F, average daily high 20.4 °C / 69 °F, share of daylight that is sunny 72%, precipitation 110 mm / 4.3 in, days with heavy rain 3 days, average daily low 14.7 °C / 58 °F.
Against: wet days 13.9 days, relative humidity 82%.
July · best
In its favour: feels like (high) 23.9 °C / 75 °F, average daily high 22.2 °C / 72 °F, share of daylight that is sunny 76%, precipitation 68 mm / 2.7 in, days with heavy rain 1.6 days, average daily low 16.5 °C / 62 °F.
Against: wet days 12.9 days, relative humidity 82%.
August · good
In its favour: feels like (high) 24.4 °C / 76 °F, average daily high 22.7 °C / 73 °F, share of daylight that is sunny 80%, precipitation 83 mm / 3.3 in, days with heavy rain 2.6 days, average daily low 16.7 °C / 62 °F.
Against: wet days 12.3 days, relative humidity 81%.
September · good
In its favour: feels like (high) 21.6 °C / 71 °F, average daily high 21.1 °C / 70 °F, share of daylight that is sunny 80%, precipitation 97 mm / 3.8 in, days with heavy rain 3.1 days, average daily low 15 °C / 59 °F.
Against: wet days 12.6 days, relative humidity 80%.
October · good
In its favour: feels like (high) 17.9 °C / 64 °F, average daily high 18.6 °C / 65 °F, share of daylight that is sunny 73%, precipitation 116 mm / 4.5 in, average daily low 12.8 °C / 55 °F, days with heavy rain 3.9 days.
Against: wet days 12.5 days, relative humidity 78%.
Beach and swimming
Hot, dry and sunny. Penalises the monsoon hard.
- JJanuary: neither
- FFebruary: neither
- MMarch: neither
- AApril: neither
- MMay: neither
- JJune: neither
- JJuly: neither
- AAugust: neither
- SSeptember: neither
- OOctober: neither
- NNovember: neither
- DDecember: neither
No month is good for this in Donostia / San Sebastián.
Hiking and trekking
Cool enough to climb in, dry enough to enjoy, long enough days.
- JJanuary: neither
- FFebruary: neither
- MMarch: good
- AApril: good
- MMay: good
- JJune: best
- JJuly: best
- AAugust: good
- SSeptember: best
- OOctober: good
- NNovember: neither
- DDecember: neither
- Best
- June–July, September
- Good
- March–May, August, October
Why these months
March · good
In its favour: average daily high 12.9 °C / 55 °F, average daily low 7.4 °C / 45 °F, share of daylight that is sunny 72%, daylight per day 11.9 h, feels like (high) 10.3 °C / 51 °F, precipitation 135 mm / 5.3 in, wind (daily max) 20 km/h / 13 mph.
Against: wet days 16.8 days, days with heavy rain 4.5 days.
April · good
In its favour: average daily high 14.8 °C / 59 °F, precipitation 110 mm / 4.3 in, feels like (high) 13.4 °C / 56 °F, average daily low 9.2 °C / 49 °F, share of daylight that is sunny 73%, daylight per day 13.4 h, days with heavy rain 3.8 days, wind (daily max) 18 km/h / 11 mph.
Against: wet days 15 days.
May · good
In its favour: average daily high 17.1 °C / 63 °F, precipitation 117 mm / 4.6 in, feels like (high) 16.8 °C / 62 °F, average daily low 11.5 °C / 53 °F, share of daylight that is sunny 73%, daylight per day 14.7 h, days with heavy rain 3.5 days, wind (daily max) 17 km/h / 10 mph.
Against: wet days 16.4 days.
June · best
In its favour: average daily high 20.4 °C / 69 °F, precipitation 110 mm / 4.3 in, feels like (high) 21.4 °C / 71 °F, share of daylight that is sunny 72%, daylight per day 15.3 h, days with heavy rain 3 days, average daily low 14.7 °C / 58 °F, wind (daily max) 16 km/h / 10 mph.
Against: wet days 13.9 days.
July · best
In its favour: average daily high 22.2 °C / 72 °F, precipitation 68 mm / 2.7 in, days with heavy rain 1.6 days, share of daylight that is sunny 76%, daylight per day 15 h, feels like (high) 23.9 °C / 75 °F, wind (daily max) 16 km/h / 10 mph, average daily low 16.5 °C / 62 °F.
Against: wet days 12.9 days.
August · good
In its favour: average daily high 22.7 °C / 73 °F, precipitation 83 mm / 3.3 in, share of daylight that is sunny 80%, daylight per day 13.9 h, days with heavy rain 2.6 days, feels like (high) 24.4 °C / 76 °F, wet days 12.3 days, wind (daily max) 16 km/h / 10 mph, average daily low 16.7 °C / 62 °F.
September · best
In its favour: average daily high 21.1 °C / 70 °F, precipitation 97 mm / 3.8 in, feels like (high) 21.6 °C / 71 °F, share of daylight that is sunny 80%, daylight per day 12.5 h, days with heavy rain 3.1 days, average daily low 15 °C / 59 °F, wet days 12.6 days, wind (daily max) 16 km/h / 10 mph.
October · good
In its favour: average daily high 18.6 °C / 65 °F, precipitation 116 mm / 4.5 in, feels like (high) 17.9 °C / 64 °F, average daily low 12.8 °C / 55 °F, share of daylight that is sunny 73%, daylight per day 11 h, days with heavy rain 3.9 days, wet days 12.5 days, wind (daily max) 18 km/h / 11 mph.
An activity is listed only where it applies: skiing at ski destinations, beach and swimming at beach destinations. The nearest ski area is La Pierre Saint-Martin, San Martingo Harria, 107 km away.
Weather averages
Monthly averages over twenty years, 2006–2025. Highs, lows and precipitation are in the chart at the top.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Feels like (high) | 7.4 °C | 8.3 °C | 10.3 °C | 13.4 °C | 16.8 °C | 21.4 °C | 23.9 °C | 24.4 °C | 21.6 °C | 17.9 °C | 11.6 °C | 8.7 °C |
| Days with heavy rain | 5.8 days | 4.5 days | 4.5 days | 3.8 days | 3.5 days | 3 days | 1.6 days | 2.6 days | 3.1 days | 3.9 days | 7.2 days | 5.3 days |
| Time rain usually falls | 9 pm | 10 pm | 5 pm | 6 pm | 10 am | 7 pm | 9 am | 10 pm | 8 am | 7 pm | 11 am | 10 pm |
| Sunshine per day | 5.9 h | 7.2 h | 8.6 h | 9.9 h | 10.7 h | 11 h | 11.4 h | 11.1 h | 10 h | 8.1 h | 6.4 h | 5.9 h |
| Relative humidity | 80% | 77% | 76% | 77% | 80% | 82% | 82% | 81% | 80% | 78% | 79% | 80% |
Sea temperature
Averaged over a shorter period (2022–2025) than the twenty-year averages above.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature 2022–2025 | 13.7 °C | 13.2 °C | 13.2 °C | 14.4 °C | 16.7 °C | 20.6 °C | 22.5 °C | 23.3 °C | 21.9 °C | 19.6 °C | 17.1 °C | 15.1 °C |
| Sea temperature (daily max) 2022–2025 | 13.7 °C | 13.4 °C | 13.4 °C | 14.7 °C | 17 °C | 21 °C | 22.8 °C | 23.6 °C | 22.1 °C | 19.8 °C | 17.2 °C | 15.1 °C |
- Very cold 10 °C or less
- Cold 10 to 15 °C
- Cool 15 to 20 °C
- Comfortable 20 to 25 °C
- Warm 25 to 28 °C
- Very warm over 28 °C
The words describe how the water feels to swim in. They are ours, not an official standard.
Air quality
Averaged over a shorter period (2022–2025) than the twenty-year averages above, and not counted towards good or best months.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Air pollution (PM2.5) 2022–2025 | 5.5 µg/m³ | 8.6 µg/m³ | 7.5 µg/m³ | 8.8 µg/m³ | 9.9 µg/m³ | 11.5 µg/m³ | 9.1 µg/m³ | 10.3 µg/m³ | 7.4 µg/m³ | 7.6 µg/m³ | 5.4 µg/m³ | 5.6 µg/m³ |
| Air pollution (PM2.5, daily peak) 2022–2025 | 8.8 µg/m³ | 13.4 µg/m³ | 11.9 µg/m³ | 13.9 µg/m³ | 14.5 µg/m³ | 16.7 µg/m³ | 13 µg/m³ | 14.6 µg/m³ | 11 µg/m³ | 11.7 µg/m³ | 8.7 µg/m³ | 9 µg/m³ |
- Good 15 µg/m³ or less
- Fair 15 to 25 µg/m³
- Moderate 25 to 37.5 µg/m³
- Poor 37.5 to 50 µg/m³
- Very poor 50 to 75 µg/m³
- Extremely poor over 75 µg/m³
Each figure is compared with the World Health Organization's guideline for a day's air, 15 µg/m³ or less, and with its interim targets above that. The words are ours: the WHO does not name its steps. The figures are modelled monthly averages, so single days can be well above them. The daily peak is the average of each day's highest hour, shaded on the same scale.