San Sebastian Weather: September
 |
Average Day Temperature: | 76.1°F |
|
Average Night Temperature: | 59.9°F |
|
Sea Water Temperature: | 72.6°F |
|
Number of Sunny Days: | 15 days |
| Sunshine Hours: | 11.8 - 13.2 hours | |
|
Number of Rainy Days: | 4 days |
| Precipitation Totals: | 1.9 in | |
| detailed information | ||
forecast
| San Sebastian |
Temperature
| San Sebastian |
Air Temperature in September, °F
The highest day temperature in September 2025 was 93°F. The lowest night temperature was 50°F. The average values for day and night temperatures during September were 72.8°F и 58.3°F respectivly.
San Sebastian Water Sea Temperature in September, °F
The average sea surface temperature in September 2025 for San Sebastian was 72.5°F. The maximum and minimum values were 70.2°F and 74.4°F respectively.
Most of the days in September are sunny but you can also expect cloudy and gloomy days.
Precipitation Totals in September, in
Precipitation total in September for San Sebastian is 1.9 in. It makes september one of the least rainy months of the year.
The average wind speed in September is 6.2 mph. It makes September one of the most windless months of the year for San Sebastian.
We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for San Sebastian in September is 8.0 hours.
San Sebastian on the Weather Map
| Alicante |  |
+56 |
| Barcelona | |
+48 |
| Costa Brava |  |
+46 |
| Eivissa | |
+60 |
| Fuerteventura | |
+66 |
| Gran Canaria | |
+62 |
| Lloret de Mar | |
+46 |
| Madrid | |
+42 |
| Malaga |  |
+54 |
| Palma de Majorka | |
+54 |
| Palma de Mallorca | |
+54 |
| Salou | |
+50 |
| Tenerife |  |
+64 |
| Torrevieja | |
+56 |
| Valencia | |
+56 |
| 1200 |  |
50°F | N 8 mph |
| 1500 |  |
50°F | N 8 mph |
| 1800 |  |
50°F | N 9 mph |
| 2100 | |
50°F | N 9 mph |
| 0000 | |
50°F | N 9 mph |
| 0300 | |
52°F | N 9 mph |
| 0600 | |
52°F | N 7 mph |
| 0900 | |
52°F | N 6 mph |