Carmarthen in Fall
In fall (September, October and November), Carmarthen sees average daytime highs around 14°C and overnight lows near 9°C, with 383 mm of rain over about 46 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 9°C by late November. The sky is clear or mostly clear about 13% of the time across fall, and the air most often feels dry.
Fall is Carmarthen's 2nd-best season to visit on our travel score. For the whole year in context, see Carmarthen's year-round climate.
- Avg daytime high
- 14°C
- 2nd-warmest season
- Avg overnight low
- 9°C
- Rainfall
- 383 mm
- 46 wet days
- Avg wind
- 20 km/h
- Travel score
- 3.3
- 2nd-best season
- Months
- Sep · Oct · Nov
Temperature in Carmarthen in Fall
Over the season highs ease from about 17°C in early September to 9°C by late November.
A typical fall day in Carmarthen reaches about 14°C and drops to 9°C overnight. The warmest of the three months is September, the coolest November.
How fall really feels in Carmarthen
Once humidity and wind are folded in, fall brings about 0 days that feel above 32°C and 0 that feel at or below 0°C.
fall sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.
Carmarthen 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° / 4° | 129 | 16.5 | 0.5 | 8.1 | 1.0 |
| Feb | 8° / 4° | 95 | 13.1 | 0.6 | 9.6 | 1.1 |
| Mar | 9° / 5° | 84 | 13.6 | 0.5 | 11.5 | 1.7 |
| Apr | 11° / 6° | 75 | 12.7 | 0.1 | 13.6 | 2.6 |
| May | 14° / 9° | 80 | 13 | 0 | 15.4 | 3.7 |
| Jun | 16° / 11° | 86 | 13.3 | 0 | 16.4 | 4.6 |
| Jul | 18° / 13° | 91 | 13.8 | 0 | 16 | 5.3 |
| Aug | 18° / 13° | 103 | 14.4 | 0 | 14.4 | 5.2 |
| Sep | 16° / 12° | 97 | 12.8 | 0 | 12.4 | 4.7 |
| Oct | 14° / 10° | 144 | 16.3 | 0 | 10.4 | 3.3 |
| Nov | 11° / 7° | 142 | 17 | 0.1 | 8.6 | 2.0 |
| Dec | 8° / 5° | 142 | 16.1 | 0.4 | 7.6 | 1.3 |
Cloud cover in Fall
The sky is clear or mostly clear about 13% of the time across fall.
Chance of precipitation in Fall
Carmarthen gets around 383 mm of rain over 46 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 20 km/h across fall.
Sunrise & sunset in Fall
Daylight runs from about 13 h 24 min in early September to 7 h 54 min 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 Carmarthen?
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 Carmarthen.
What to pack for Carmarthen in Fall
From fall's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In fall, Carmarthen sees daytime highs around 14°C and nights near 9°C. Pack a warm layer and rain gear. Worth having: a windbreaker. About 46 days see rain.
Sea temperature near Carmarthen 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 at the nearest coast (about 26 km away) is warmest in August at about 17°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) | 9 | 8 | 8 | 9 | 11 | 13 | 16 | 17 | 17 | 15 | 13 | 10 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Cool | Cool | Cool | Cool | Bracing | Bracing |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 9 | Bracing |
| Feb | 8 | Bracing |
| Mar | 8 | Bracing |
| Apr | 9 | Bracing |
| May | 11 | Bracing |
| Jun | 13 | Bracing |
| Jul | 16 | Cool |
| Aug | 17 | Cool |
| Sep | 17 | Cool |
| Oct | 15 | Cool |
| Nov | 13 | Bracing |
| Dec | 10 | Bracing |
UV index in Carmarthen in Fall
Clear-sky midday UV across fall averages around 2. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Carmarthen 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 | 6 | 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 | 6 | High |
| Sep | 4 | Moderate |
| Oct | 2 | Moderate |
| Nov | 1 | Low |
| Dec | 1 | Low |
Where is Carmarthen?
Carmarthen sits at 51.9°N, 4.3°W, 23 m above sea level, in United Kingdom. The nearest listed city is Llanelli, 22 km away.
Topography around Carmarthen
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Carmarthen.
Within 3 km, the terrain around Carmarthen has only modest variations in elevation — a maximum elevation change of 170 m around an average of 46 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 358 m; within 80 km, large variations in elevation — a maximum elevation change of 878 m.
The land around Carmarthen is covered by grassland (57%) and trees (26%) within 3 km, grassland (65%) and trees (27%) within 16 km, and water (48%) and grassland (37%) 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 Carmarthen (51.8555°, -4.3053°, elevation 23 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.