September weather - Autumn 2024

Weather in September
Frequently asked questions
Average temperature in September
Average pressure in September
Average wind speed in September
Average humidity in September
Average rainfall in September
Average rainfall days in September
Average snowfall in September
Average snowfall days in September
Average sea temperature in September
Average daylight in September
Average sunshine in September
Average sunshine days in September
Average UV index in September
Average cloud cover in September
Average visibility in September

The Palacio de la Madalena in Santander, Spain

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.

Updated: Jan 29, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the usual temperature for Santander in September?

In Santander, in September, the average high-temperature is 20.9°C (69.6°F), and the average low-temperature is 17°C (62.6°F).

What is the average humidity in September in Santander?

In September, the average relative humidity is 75%.

How many days does it rain in September in Santander?

In Santander, Spain, in September, it is raining for 8.3 days, with typically 15mm (0.59") of accumulated precipitation.

When it does not snow in Santander?

In Santander, Spain, snow does not fall in March through November.

How cold is the water in September in Santander?

In September, the average sea temperature in Santander is 20.4°C (68.7°F). Swimming in 20.4°C (68.7°F) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 21°C (69.8°F).

What is the average length of the day in September in Santander?

In September, the average day length in Santander is 12h and 30min.

When are sunrise and sunset in September in Santander?

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.

How long on average sun shines in September in Santander?

In September, the average sunshine duration is 8.4h.

When is the highest UV index in Santander?

May through October, with an average maximum UV index of 5, are months with the highest UV index in Santander, Spain.

How high is the UV index in September in Santander?

The average daily maximum UV index in September in Santander is 5. A UV Index estimate of 3 to 5 represents a medium health risk from exposure to the Sun's UV radiation.

Today

Tomorrow

Long-term

Year J F M A M J J A September O N D

Aug

September

Oct

Average high temperature

21.9°C 71.4°F

20.9°C 69.6°F

19.4°C 66.9°F

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

13.4km/h 8.3mph

13.5km/h 8.4mph

15.4km/h 9.6mph

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

Average snowfall

Average snowfall days

Average sea temperature

Average daylight

Average sunshine

Average sunshine days

20.1

19.8

19.1

Average UV index

Average cloud cover

Average visibility

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 3min

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 2min

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).

September weather forecast
Santander, Spain

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