September weather forecastSantander, Spain
September
Weather in September
In September, Santander starts transitioning into fall with temperatures on the decline, making the air a little chilly. A notable feature is the drop in rainfall to 15mm (0.59"), similar to that in August. Rainfall is not frequent, contributing to the pleasantness of the city. Cooler days accompanied by a consistent daylight of approximately 12.5 hours are observed in the city. As the city moves from summer to fall, the days begin to shorten, and the weather turns a shade cooler.Temperature
Santander records an average high-temperature of a still pleasant 20.9°C (69.6°F) in September, maintaining a close correlation with August's 21.9°C (71.4°F). During the nights of September, Santander records an average temperature of 17°C (62.6°F), a minor drop from daytime peaks.Humidity
The average relative humidity in September in Santander, Spain, is 75%.Rainfall
In Santander, in September, during 8.3 rainfall days, 15mm (0.59") of precipitation is typically accumulated. Throughout the year, there are 133.9 rainfall days, and 336mm (13.23") of precipitation is accumulated.Snowfall
In Santander, Spain, snow does not fall in March through November.Sea temperature
In September, the average sea temperature is 20.4°C (68.7°F).Note: The majority of individuals do not enjoy swimming in water that is 20.4°C (68.7°F). Breathing control becomes more challenging as the water temperature dips from 21°C (69.8°F) to 15°C (59°F).
Daylight
In September, the average length of the day in Santander is 12h and 30min.On the first day of September, sunrise is at 07:39 and sunset at 20:50. On the last day of the month, sunrise is at 08:12 and sunset at 19:57 CEST.
Sunshine
In September, the average sunshine in Santander is 8.4h.UV index
May through October, with an average maximum UV index of 5, are months with the highest UV index in Santander. A UV Index value of 3 to 5 symbolizes a moderate health risk from unsafe exposure to UV radiation for the average person.Note: A maximum UV index of 5 in September translates into the following recommendations:
Heed the precautions - It is counselled to guard against solar damage. Sun's radiation is most powerful around mid-day, so it's best to limit outdoor activities during this time. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Santander, Spain
- Average high temperature in September: 20.9°C
The warmest month (with the highest average high temperature) is August (21.9°C).
The months with the lowest average high temperature are January and February (11.8°C).
- Average low temperature in September: 17°C
The month with the highest average low temperature is August (18.1°C).
The coldest month (with the lowest average low temperature) is February (8.4°C).
Average pressure in September
Santander, Spain
- Average pressure in September: 1018.5mbar
The month with the highest atmospheric pressure is December (1021.5mbar).
The months with the lowest atmospheric pressure are April and November (1015.7mbar).
Average wind speed in September
Santander, Spain
- Average wind speed in September: 12.8km/h
The windiest month (with the highest average wind speed) is November (19.5km/h).
The calmest month (with the lowest average wind speed) is August (12.3km/h).
Average humidity in September
Santander, Spain
- Average humidity in September: 75%
The months with the highest relative humidity are June and July (80%).
The months with the lowest relative humidity are October and December (72%).
Average rainfall in September
Santander, Spain
- Average rainfall in September: 15mm
The wettest month (with the highest rainfall) is November (53mm).
The driest month (with the least rainfall) is July (14mm).
Average rainfall days in September
Santander, Spain
- Average rainfall days in September: 8.3 days
The month with the highest number of rainy days is January (13.8 days).
The month with the least rainy days is September (8.3 days).
Average snowfall in September
Santander, Spain
- Average snowfall in September: 0mm
The months with the highest snowfall are January and February (4mm).
The months with the least snowfall are March, April, May, June, July, August, September, October and November (0mm).
Average snowfall days in September
Santander, Spain
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (0.9 days).
The months with the least snowfall days are April, May, June, July, August, September, October and November (0 days).
Average sea temperature in September
Santander, Spain
- Average sea temperature in September: 20.4°C
The best month for swimming (with the highest average sea temperature) is August (21.2°C).
The coldest month (with the lowest average sea temperature) is February (12.7°C).
Average daylight in September /
Average sunshine in September
Santander, Spain
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).
- Average sunshine in September: 8h and 24min
The months with the most sunshine are June and July (Average sunshine: 9h and 24min).
The month with the least sunshine is November (Average sunshine: 5h and 24min).
Average sunshine days in September
Santander, Spain
- Average sunshine days in September: 19.8 days
The month with the most sunshine days is August (20.1 days).
The month with the least sunshine days is February (14.2 days).
Average UV index in September
Santander, Spain
- Average UV index in September: 5
The months with the highest UV index are May, June, July, August, September and October (UV index 5).
The months with the lowest UV index are January, February, April and November (UV index 3).
Average cloud cover in September
Santander, Spain
- Average cloud cover in September: 31
The month with the most cloud cover is January (Cloud cover 49).
The month with the least cloud cover is September (Cloud cover 31).
Average visibility in September
Santander, Spain
- Average visibility in September: 10km
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
