Castro-Urdiales in Fall
In fall (September, October and November), Castro-Urdiales sees average daytime highs around 18°C and overnight lows near 14°C, with 322 mm of rain over about 41 wet days across the season. It is the 2nd-warmest season and the 2nd-wettest season.
Over the season highs ease from about 22°C in early September to 14°C by late November. The sky is clear or mostly clear about 25% of the time across fall, and the air most often feels dry.
Fall is Castro-Urdiales's 2nd-best season to visit on our travel score. For the whole year in context, see Castro-Urdiales's year-round climate.
- Avg daytime high
- 18°C
- 2nd-warmest season
- Avg overnight low
- 14°C
- Rainfall
- 322 mm
- 41 wet days
- Avg wind
- 15 km/h
- Travel score
- 5.3
- 2nd-best season
- Months
- Sep · Oct · Nov
Temperature in Castro-Urdiales in Fall
Over the season highs ease from about 22°C in early September to 14°C by late November.
A typical fall day in Castro-Urdiales reaches about 18°C and drops to 14°C overnight. The warmest of the three months is September, the coolest November.
Castro-Urdiales weather by month
How the three fall months (September, October and November) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 12° / 9° | 119 | 15 | 9.2 | 2.9 |
| Feb | 12° / 8° | 103 | 13.5 | 10.2 | 2.9 |
| Mar | 14° / 10° | 98 | 13.2 | 11.6 | 3.7 |
| Apr | 15° / 11° | 89 | 13.8 | 13.2 | 4.0 |
| May | 17° / 13° | 69 | 12.7 | 14.5 | 5.1 |
| Jun | 20° / 16° | 56 | 9.9 | 15.2 | 6.2 |
| Jul | 22° / 18° | 46 | 9.1 | 14.9 | 6.9 |
| Aug | 23° / 19° | 49 | 9.4 | 13.8 | 7.0 |
| Sep | 21° / 17° | 66 | 10.9 | 12.3 | 6.4 |
| Oct | 19° / 15° | 103 | 13.8 | 10.8 | 5.5 |
| Nov | 15° / 12° | 152 | 16.1 | 9.5 | 3.9 |
| Dec | 13° / 10° | 117 | 14.9 | 8.8 | 3.3 |
Cloud cover in Fall
The sky is clear or mostly clear about 25% of the time across fall.
Chance of precipitation in Fall
Castro-Urdiales gets around 322 mm of rain over 41 wet days across fall. The line is the day-by-day chance of measurable precipitation.
Humidity in Fall
Most of fall feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Fall
Winds average 15 km/h across fall.
Sunrise & sunset in Fall
Daylight runs from about 13 hours in early September to 9 hours by late November. The lit band spans sunrise to sunset each day.
Solar energy in Fall
Average shortwave solar energy reaching the ground each day across fall, about 3.0 kWh/m².
Is fall a good time to visit Castro-Urdiales?
Our two travel scores rate fall for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
fall is a reasonable time to visit Castro-Urdiales for sightseeing.
What to pack for Castro-Urdiales in Fall
From fall's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In fall, Castro-Urdiales sees daytime highs around 18°C and nights near 14°C. Pack rain gear. Worth having: a warm layer. About 41 days see rain.
Sea temperature near Castro-Urdiales in Fall
The nearest coast averages about 18°C across fall — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea offshore is warmest in August at about 22°C and coldest in February near 13°C.
It's comfortable for a long swim from Jul 11 to Sep 21 — about 2.4 months when the water holds above 20°C.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 13 | 13 | 13 | 13 | 15 | 18 | 21 | 22 | 20 | 18 | 16 | 14 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Cool | Cool | Refreshing | Refreshing | Refreshing | Cool | Cool | Bracing |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 13 | Bracing |
| Feb | 13 | Bracing |
| Mar | 13 | Bracing |
| Apr | 13 | Bracing |
| May | 15 | Cool |
| Jun | 18 | Cool |
| Jul | 21 | Refreshing |
| Aug | 22 | Refreshing |
| Sep | 20 | Refreshing |
| Oct | 18 | Cool |
| Nov | 16 | Cool |
| Dec | 14 | Bracing |
UV index in Castro-Urdiales in Fall
Clear-sky midday UV across fall averages around 4 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Castro-Urdiales peaks around July 15 at about 9 (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.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 2 | 2 | 5 | 6 | 6 | 8 | 9 | 8 | 5 | 4 | 2 | 1 |
| Level | Low | Low | Moderate | High | High | Very high | Very high | Very high | High | Moderate | Low | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 2 | Low |
| Feb | 2 | Low |
| Mar | 5 | Moderate |
| Apr | 6 | High |
| May | 6 | High |
| Jun | 8 | Very high |
| Jul | 9 | Very high |
| Aug | 8 | Very high |
| Sep | 5 | High |
| Oct | 4 | Moderate |
| Nov | 2 | Low |
| Dec | 1 | Low |
Where is Castro-Urdiales?
Castro-Urdiales sits at 43.4°N, 3.2°W, 18 m above sea level, in Spain. The nearest listed city is Santurtzi, 16 km away.
Topography around Castro-Urdiales
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Castro-Urdiales.
Within 3 km, the terrain around Castro-Urdiales has significant variations in elevation — a maximum elevation change of 455 m around an average of 60 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 851 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,676 m.
The land around Castro-Urdiales is covered by water (46%) and trees (30%) within 3 km, water (50%) and trees (35%) within 16 km, and trees (37%), water (35%) and grassland (20%) within 80 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
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 Castro-Urdiales (43.3828°, -3.2204°, elevation 18 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.