Santander weather in September

In September, Santander sees average daytime highs of 21°C and overnight lows near 17°C, with 78 mm of rain across 11.3 wet days and about 12.3 hours of daylight. It is the 3rd-warmest and 9th-wettest month of the year here.

Highs ease over the month, from about 22°C in the first days to 20°C by the end. The sky is clear or mostly clear about 30% of the time in September, and the air most often feels comfortable.

Daylight stretches from about 13 hours at the start of September to 11 h 36 min by month's end. Set against the rest of the year, September is Santander's 2nd-clearest and 10th-windiest month. For the whole year in context, see Santander's year-round climate.

Daytime high
21°
3rd warmest
Overnight low
17°
10th coldest
Rainfall
78 mm
11.3 wet days
Daylight
12 h 18 min
7:01 AM – 7:18 PM
Cloud cover
55%
2nd clearest
Wind
11 km/h
10th windiest
Solar energy
4.24 kWh/m²
Travel score
6.3
out of 10

Santander is city in Spain.

Air quality
Good
PM10 22.5 µg/m³ · 2019

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 22°C in the first days to 20°C by the end.

A typical September day in Santander reaches about 21°C in the afternoon and slips back to 17°C overnight — a 5°C spread between the day's warmth and the night's chill. On most days the high lands between 18°C and 24°C. Set against its neighbours, September runs about 2°C cooler than August and about 3°C warmer than October.

10°15°20°25°151015202530
Avg high (°C)Avg low (°C)
12218
22218
32217
42217
52217
62217
72217
82217
92217
102217
112217
122117
132117
142117
152117
162117
172116
182116
192116
202116
212116
222116
232116
242016
252016
262016
272016
282016
292016
302015

Santander weather by month

How September compares with the rest of the year at a glance. September is the 3rd-warmest and 9th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan12° / 11514.69.12.8
Feb12° / 10312.910.22.9
Mar14° / 10412.911.63.6
Apr15° / 10°10314.813.23.9
May17° / 13°8614.114.55.0
Jun20° / 16°6810.915.26.1
Jul22° / 18°5410.314.96.7
Aug23° / 18°6010.313.86.9
Sep21° / 17°7811.312.36.3
Oct19° / 14°10913.310.85.5
Nov15° / 11°15015.89.53.9
Dec13° / 11413.98.83.2

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 30% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 20% of September, with mostly cloudy or overcast conditions the remaining 50%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15347
25545
35545
45545
55545
65545
75545
85545
95446
105446
115347
125248
135248
145050
154951
164951
174951
184753
194753
204753
214654
224654
234654
244654
254654
264654
274555
284555
294357
304357

Chance of precipitation in September

Any precipitation

Santander gets around 78 mm of rain over 11.3 wet days in September. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 39% and peaks near 42% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%50%151015202530
Rain chance (%)
133
233
333
433
534
634
735
835
936
1037
1138
1238
1339
1440
1540
1641
1741
1841
1942
2042
2142
2241
2341
2441
2541
2641
2741
2841
2941
3041

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

Most of September feels comfortable — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, September lands in the comfortable band about 37% of days. Sticky, muggy-or-worse air turns up on roughly 12% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
16344020
26353920
37353919
48363818
58363818
69363817
710363717
811363716
912363616
1013363516
1113363516
1214363415
1315363415
1416363414
1517363313
1618363312
1719373312
1820373211
1921373210
202138329
212238328
222339317
232339317
242339316
252439316
262439315
272539315
282639304
292739304
302839293

Wind in September

Winds average 11 km/h in September.

Across September, daily wind ranges from about 11 km/h on the calmest days to 12 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
111calm
211calm
311calm
411calm
511calm
611calm
711calm
811calm
911calm
1011calm
1111calm
1211calm
1311calm
1411calm
1512calm
1612calm
1712calm
1812calm
1912calm
2012calm
2112calm
2212calm
2312calm
2412calm
2512calm
2612calm
2712calm
2812calm
2912calm
3012calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 13 hours at the start of September to 11 h 36 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 84 minutes over September. Sunrise moves from 6:44 AM to 7:17 AM, and sunset from 7:46 PM to 6:52 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.06:447:46
213.06:457:44
312.96:467:43
412.96:477:41
512.86:487:39
612.86:497:37
712.76:507:35
812.76:527:33
912.66:537:32
1012.66:547:30
1112.56:557:28
1212.56:567:26
1312.46:577:24
1412.46:587:22
1512.37:007:20
1612.37:017:18
1712.27:027:16
1812.27:037:15
1912.17:047:13
2012.17:057:11
2112.07:077:09
2212.07:087:07
2311.97:097:05
2411.97:107:03
2511.87:117:01
2611.87:126:59
2711.77:146:58
2811.77:156:56
2911.67:166:54
3011.67:176:52

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.24 kWh/m².

For context, solar energy here swings from a low near 1.43 kWh/m² to a high of 6.1 kWh/m² in June across the year — September's 4.24 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.8Bright
24.8Bright
34.7Bright
44.7Bright
54.7Bright
64.6Bright
74.6Bright
84.5Bright
94.5Bright
104.5Bright
114.4Bright
124.4Bright
134.3Bright
144.3Bright
154.2Bright
164.2Bright
174.2Bright
184.1Bright
194.1Bright
204.0Bright
214.0Moderate
223.9Moderate
233.9Moderate
243.8Moderate
253.8Moderate
263.8Moderate
273.7Moderate
283.7Moderate
293.6Moderate
303.6Moderate
Planning a trip in September

Is September a good time to visit Santander?

Our two travel scores rate September for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

6.3
Sightseeing
3rd-best month of the year
3.9
Beach & pool
3rd-best month of the year

September is a reasonable time to visit Santander for sightseeing.

What to pack for Santander in September

From September's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In September, Santander sees daytime highs around 21°C and nights near 17°C. Worth packing: rain gear. About 11 days see rain.

rain gear

Sea temperature near Santander in September

The nearest coast averages about 20°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 19 km away) is warmest in August at about 22°C and coldest in February near 13°C.

It's comfortable for a long swim from Jul 13 to Sep 21 — about 2.3 months when the water holds above 20°C.

10°15°20°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingcomfortable to swim
Sea temperature (°C)Comfort
Jan13Bracing
Feb13Bracing
Mar13Bracing
Apr13Bracing
May15Cool
Jun18Cool
Jul20Refreshing
Aug22Refreshing
Sep20Refreshing
Oct18Cool
Nov16Cool
Dec14Bracing

UV index in Santander in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 5 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Santander peaks around July 17 at about 8 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highHighModerateLowJul 17UV 8Dec 22UV 1
UV index (midday)Level
Jan1Low
Feb2Low
Mar5Moderate
Apr6High
May6High
Jun8Very high
Jul8Very high
Aug8Very high
Sep5High
Oct4Moderate
Nov2Low
Dec1Low
Location & terrain

Where is Santander?

Santander sits at 43.5°N, 3.8°W, 1 m above sea level, in Spain. The nearest listed city is El Astillero, 7.0 km away.

Topography around Santander

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Santander.

Within 3 km, the terrain around Santander has only modest variations in elevation — a maximum elevation change of 82 m around an average of 18 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 562 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,293 m.

The land around Santander is covered by water (38%), artificial surfaces (32%) and grassland (23%) within 3 km, water (49%) and grassland (24%) within 16 km, and water (38%), trees (32%) and grassland (25%) within 80 km.

3 km
82 m
16 km
562 m
80 km
2,293 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: El Astillero 7.0 km · Camargo 9.0 km · Torrelavega 24 km · Castro-Urdiales 48 km · Santurtzi 64 km · Getxo 65 km · Portugalete 65 km · Algorta 66 km

Spain travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type C / F
230 V · 50 Hz
Prices
≈ 65% of US
price level, 2025
GDP per capita
$38,627
2025
Happiness
6.5 / 10
World Happiness, 2025
Safe drinking water
99%
of population, 2024
Homicide rate
0.7
per 100k, 2023
Road deaths
3.9
per 100k/yr, 2019
Income group
High
World Bank
English
Moderate
EF EPI 540
Religion
Roman Catholic 58%atheist 16%agnostic 11%non-believer 11%

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Santander (43.4659°, -3.8049°, elevation 1 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).