Swansea in Fall
In fall (September, October and November), Swansea sees average daytime highs around 14°C and overnight lows near 11°C, with 382 mm of rain over about 47 wet days across the season. It is the 2nd-warmest season and the wettest season of the year.
Over the season highs ease from about 17°C in early September to 10°C by late November. The sky is clear or mostly clear about 14% of the time across fall, and the air most often feels dry.
Fall is Swansea's 2nd-best season to visit on our travel score. For the whole year in context, see Swansea's year-round climate.
- Avg daytime high
- 14°C
- 2nd-warmest season
- Avg overnight low
- 11°C
- Rainfall
- 382 mm
- 47 wet days
- Avg wind
- 23 km/h
- Travel score
- 3.5
- 2nd-best season
- Months
- Sep · Oct · Nov
Temperature in Swansea in Fall
Over the season highs ease from about 17°C in early September to 10°C by late November.
A typical fall day in Swansea reaches about 14°C and drops to 11°C overnight. The warmest of the three months is September, the coolest November.
Swansea 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 | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | 8° / 5° | 128 | 17 | 0.4 | 8.1 | 1.1 |
| Feb | 8° / 5° | 90 | 13 | 0.6 | 9.6 | 1.1 |
| Mar | 9° / 6° | 83 | 13.7 | 0.3 | 11.5 | 1.6 |
| Apr | 11° / 7° | 69 | 12 | 0.1 | 13.6 | 2.5 |
| May | 13° / 10° | 72 | 12.4 | 0 | 15.3 | 3.6 |
| Jun | 16° / 12° | 79 | 12.2 | 0 | 16.3 | 4.6 |
| Jul | 18° / 14° | 86 | 13.8 | 0 | 15.9 | 5.2 |
| Aug | 18° / 15° | 101 | 14.3 | 0 | 14.4 | 5.2 |
| Sep | 17° / 13° | 96 | 13.2 | 0 | 12.4 | 4.8 |
| Oct | 14° / 11° | 143 | 16.7 | 0 | 10.4 | 3.4 |
| Nov | 11° / 8° | 143 | 17.3 | 0 | 8.6 | 2.2 |
| Dec | 9° / 6° | 145 | 16.8 | 0.3 | 7.7 | 1.4 |
Cloud cover in Fall
The sky is clear or mostly clear about 14% of the time across fall.
Chance of precipitation in Fall
Swansea gets around 382 mm of rain over 47 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 23 km/h across fall.
Sunrise & sunset in Fall
Daylight runs from about 13 h 24 min in early September to 8 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 2.0 kWh/m².
Is fall a good time to visit Swansea?
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 weaker month for outdoor sightseeing in Swansea.
What to pack for Swansea in Fall
From fall's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In fall, Swansea sees daytime highs around 14°C and nights near 11°C. Pack a warm layer and rain gear. Worth having: a windbreaker. About 47 days see rain.
Sea temperature near Swansea in Fall
The nearest coast averages about 15°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 18°C and coldest in February near 8°C.
The water stays below 20°C all year — cool enough that most swimmers want a wetsuit.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 8 | 8 | 8 | 9 | 11 | 14 | 16 | 18 | 17 | 15 | 12 | 10 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Cool | Cool | Cool | Cool | Bracing | Bracing |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 8 | Bracing |
| Feb | 8 | Bracing |
| Mar | 8 | Bracing |
| Apr | 9 | Bracing |
| May | 11 | Bracing |
| Jun | 14 | Bracing |
| Jul | 16 | Cool |
| Aug | 18 | Cool |
| Sep | 17 | Cool |
| Oct | 15 | Cool |
| Nov | 12 | Bracing |
| Dec | 10 | Bracing |
UV index in Swansea in Fall
Clear-sky midday UV across fall averages around 3. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Swansea peaks around August 13 at about 6 (high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near January 1 at about 1 (low).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 6 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 1 | 1 | 3 | 4 | 6 | 6 | 6 | 7 | 4 | 2 | 1 | 1 |
| Level | Low | Low | Moderate | Moderate | High | High | High | High | Moderate | Moderate | Low | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 1 | Low |
| Feb | 1 | Low |
| Mar | 3 | Moderate |
| Apr | 4 | Moderate |
| May | 6 | High |
| Jun | 6 | High |
| Jul | 6 | High |
| Aug | 7 | High |
| Sep | 4 | Moderate |
| Oct | 2 | Moderate |
| Nov | 1 | Low |
| Dec | 1 | Low |
Where is Swansea?
Swansea sits at 51.6°N, 3.9°W, 18 m above sea level, in United Kingdom. The nearest listed city is Clydach, 8.0 km away.
Topography around Swansea
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Swansea.
Within 3 km, the terrain around Swansea has only modest variations in elevation — a maximum elevation change of 194 m around an average of 44 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 422 m; within 80 km, large variations in elevation — a maximum elevation change of 878 m.
The land around Swansea is covered by artificial surfaces (34%), water (32%) and trees (23%) within 3 km, water (35%), grassland (28%) and trees (26%) within 16 km, and grassland (46%) and water (35%) within 80 km.
United Kingdom travel facts
- Travel advisory
- Level 2
- Exercise Increased Caution
- Power plugs
- Type D / G / M
- 230 V · 50 Hz
- Prices
- ≈ 89% of US
- price level, 2025
- GDP per capita
- $57,602
- 2025
- Happiness
- 6.7 / 10
- World Happiness, 2025
- Safe drinking water
- 100%
- of population, 2024
- Homicide rate
- 1.1
- per 100k, 2021
- Road deaths
- 3.2
- per 100k/yr, 2019
- Income group
- High
- World Bank
- 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 Swansea (51.6208°, -3.9432°, 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.