The highest day temperature in September 2026 was 81°F. The lowest night temperature was 60°F. The average values for day and night temperatures during September were 72.0°F и 66.4°F respectivly.

The average sea surface temperature in September 2026 for Santander was 71.3°F. The maximum and minimum values were 70.0°F and 73.4°F respectively.

Most of the days in September are sunny but you can also expect cloudy and gloomy days.

Precipitation total in September for Santander is 1.2 in. It makes september the least rainy month of the year.

The average wind speed in September is 8.1 mph. It makes September one of the most windless months of the year for Santander.

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 Santander in September is 8.1 hours.