Carmarthen weather in October

In October, Carmarthen sees average daytime highs of 14°C and overnight lows near 10°C, with 144 mm of rain across 16.3 wet days and about 10.4 hours of daylight. It is the 6th-warmest and 1st-wettest month of the year here.

Highs ease over the month, from about 15°C in the first days to 12°C by the end. The sky is clear or mostly clear about 13% of the time in October, and the air most often feels dry.

Daylight stretches from about 11 h 24 min at the start of October to 9 h 24 min by month's end. Set against the rest of the year, October is Carmarthen's 9th-clearest and 5th-windiest month. For the whole year in context, see Carmarthen's year-round climate.

Daytime high: 14°; 6th warmest
Overnight low: 10°; 8th coldest
Rainfall: 144 mm; 16.3 wet days
Daylight: 10 h 24 min; 6:51 AM – 5:13 PM
Cloud cover: 73%; 9th clearest
Wind: 21 km/h; 5th windiest
Solar energy: 1.89 kWh/m²
Travel score: 3.3; out of 10

Carmarthen is county town and community in Carmarthenshire, Wales.

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

← September Carmarthen year-round climate November →Best places to visit in October

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Temperature in October

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 15°C in the first days to 12°C by the end.

A typical October day in Carmarthen reaches about 14°C in the afternoon and slips back to 10°C overnight — a 4°C spread between the day's warmth and the night's chill. On most days the high lands between 11°C and 16°C. Set against its neighbours, October runs about 3°C cooler than September and about 3°C warmer than November.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Avg high (°C)	15	15	15	15	15	15	15	14	14	14	14	14	14	14	14	14	13	13	13	13	13	13	13	13	13	13	13	12	12	12	12
Avg low (°C)	11	11	11	11	11	11	10	10	10	10	10	10	10	10	10	10	10	9	9	9	9	9	9	9	9	9	9	9	9	9	8

	Avg high (°C)	Avg low (°C)
1	15	11
2	15	11
3	15	11
4	15	11
5	15	11
6	15	11
7	15	10
8	14	10
9	14	10
10	14	10
11	14	10
12	14	10
13	14	10
14	14	10
15	14	10
16	14	10
17	13	10
18	13	9
19	13	9
20	13	9
21	13	9
22	13	9
23	13	9
24	13	9
25	13	9
26	13	9
27	13	9
28	12	9
29	12	9
30	12	9
31	12	8

How October really feels in Carmarthen

Once humidity and wind are folded in, October averages 0 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C

heat index over the day's high

Days feeling ≤ 0°C

wind chill below the day's low

October 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 October compares with the rest of the year at a glance. October is the 6th-warmest and 1st-wettest month here — the current month is highlighted below.

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 October

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 13% of the time in October.

Beyond those clear spells, partly cloudy skies cover about 15% of October, with mostly cloudy or overcast conditions the remaining 72%.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Clearer (%)	26	26	27	28	28	28	28	28	29	29	29	29	29	30	30	30	30	30	29	29	29	29	28	28	27	27	26	26	25	25	25
Cloudier (%)	74	74	73	72	72	72	72	72	71	71	71	71	71	70	70	70	70	70	71	71	71	71	72	72	73	73	74	74	75	75	75

	Clearer (%)	Cloudier (%)
1	26	74
2	26	74
3	27	73
4	28	72
5	28	72
6	28	72
7	28	72
8	28	72
9	29	71
10	29	71
11	29	71
12	29	71
13	29	71
14	30	70
15	30	70
16	30	70
17	30	70
18	30	70
19	29	71
20	29	71
21	29	71
22	29	71
23	28	72
24	28	72
25	27	73
26	27	73
27	26	74
28	26	74
29	25	75
30	25	75
31	25	75

Chance of precipitation in October

Any precipitation

Carmarthen gets around 144 mm of rain over 16.3 wet days in October, the wettest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 52% and peaks near 58% on the wettest days.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Rain chance (%)	52	52	52	52	52	52	51	51	50	49	49	48	48	48	48	48	49	50	50	51	52	53	54	55	56	56	57	57	58	58	58

	Rain chance (%)
1	52
2	52
3	52
4	52
5	52
6	52
7	51
8	51
9	50
10	49
11	49
12	48
13	48
14	48
15	48
16	48
17	49
18	50
19	50
20	51
21	52
22	53
23	54
24	55
25	56
26	56
27	57
28	57
29	58
30	58
31	58

Humidity in October

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, October lands in the dry band about 90% of days. It rarely turns muggy — the humid and sticky bands barely register.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Dry (%)	83	84	84	85	86	86	87	87	88	88	88	89	89	89	89	90	90	91	91	91	92	92	93	93	93	94	94	94	94	95	95
Comfortable (%)	17	16	16	15	14	14	13	13	12	12	12	11	11	11	11	10	10	9	9	9	8	8	7	7	7	6	6	6	6	5	5

	Dry (%)	Comfortable (%)
1	83	17
2	84	16
3	84	16
4	85	15
5	86	14
6	86	14
7	87	13
8	87	13
9	88	12
10	88	12
11	88	12
12	89	11
13	89	11
14	89	11
15	89	11
16	90	10
17	90	10
18	91	9
19	91	9
20	91	9
21	92	8
22	92	8
23	93	7
24	93	7
25	93	7
26	94	6
27	94	6
28	94	6
29	94	6
30	95	5
31	95	5

Wind in October

Winds average 21 km/h in October.

Across October, daily wind ranges from about 19 km/h on the calmest days to 21 km/h at its breeziest. It stays fairly steady from day to day.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Wind speed (km/h)	19	19	19	19	19	20	20	20	20	20	20	20	20	20	20	20	20	20	21	21	21	21	21	21	21	21	21	21	21	21	21
Feels	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy

	Wind speed (km/h)	Feels
1	19	light breeze
2	19	light breeze
3	19	light breeze
4	19	light breeze
5	19	light breeze
6	20	light breeze
7	20	light breeze
8	20	light breeze
9	20	light breeze
10	20	light breeze
11	20	light breeze
12	20	light breeze
13	20	light breeze
14	20	light breeze
15	20	breezy
16	20	breezy
17	20	breezy
18	20	breezy
19	21	breezy
20	21	breezy
21	21	breezy
22	21	breezy
23	21	breezy
24	21	breezy
25	21	breezy
26	21	breezy
27	21	breezy
28	21	breezy
29	21	breezy
30	21	breezy
31	21	breezy

Sunrise & sunset in October

DaylightNight

Daylight runs from about 11 h 24 min at the start of October to 9 h 24 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 120 minutes over October. Sunrise moves from 6:25 AM to 7:19 AM, and sunset from 5:47 PM to 4:43 PM.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Daylight (h)	11.4	11.3	11.2	11.2	11.1	11.0	11.0	10.9	10.8	10.8	10.7	10.6	10.6	10.5	10.4	10.4	10.3	10.2	10.2	10.1	10.0	10.0	9.9	9.8	9.8	9.7	9.7	9.6	9.5	9.5	9.4
Sunrise (AM)	6:25	6:27	6:29	6:30	6:32	6:34	6:36	6:37	6:39	6:41	6:43	6:44	6:46	6:48	6:50	6:51	6:53	6:55	6:57	6:59	7:00	7:02	7:04	7:06	7:08	7:10	7:11	7:13	7:15	7:17	7:19
Sunset (PM)	5:47	5:45	5:43	5:40	5:38	5:36	5:33	5:31	5:29	5:26	5:24	5:22	5:20	5:17	5:15	5:13	5:11	5:09	5:07	5:05	5:02	5:00	4:58	4:56	4:54	4:52	4:50	4:49	4:47	4:45	4:43

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	11.4	6:25	5:47
2	11.3	6:27	5:45
3	11.2	6:29	5:43
4	11.2	6:30	5:40
5	11.1	6:32	5:38
6	11.0	6:34	5:36
7	11.0	6:36	5:33
8	10.9	6:37	5:31
9	10.8	6:39	5:29
10	10.8	6:41	5:26
11	10.7	6:43	5:24
12	10.6	6:44	5:22
13	10.6	6:46	5:20
14	10.5	6:48	5:17
15	10.4	6:50	5:15
16	10.4	6:51	5:13
17	10.3	6:53	5:11
18	10.2	6:55	5:09
19	10.2	6:57	5:07
20	10.1	6:59	5:05
21	10.0	7:00	5:02
22	10.0	7:02	5:00
23	9.9	7:04	4:58
24	9.8	7:06	4:56
25	9.8	7:08	4:54
26	9.7	7:10	4:52
27	9.7	7:11	4:50
28	9.6	7:13	4:49
29	9.5	7:15	4:47
30	9.5	7:17	4:45
31	9.4	7:19	4:43

Solar energy in October

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in October, about 1.89 kWh/m².

For context, solar energy here swings from a low near 0.65 kWh/m² to a high of 5.77 kWh/m² in June across the year — October's 1.89 kWh/m² falls in the middle.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Solar energy (kWh/m²)	2.5	2.4	2.4	2.3	2.3	2.3	2.2	2.2	2.1	2.1	2.1	2.0	2.0	2.0	1.9	1.9	1.9	1.9	1.8	1.8	1.7	1.7	1.7	1.6	1.6	1.6	1.5	1.5	1.4	1.4	1.4
Level	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim

	Solar energy (kWh/m²)	Level
1	2.5	Moderate
2	2.4	Moderate
3	2.4	Moderate
4	2.3	Moderate
5	2.3	Moderate
6	2.3	Moderate
7	2.2	Moderate
8	2.2	Moderate
9	2.1	Moderate
10	2.1	Moderate
11	2.1	Moderate
12	2.0	Moderate
13	2.0	Moderate
14	2.0	Dim
15	1.9	Dim
16	1.9	Dim
17	1.9	Dim
18	1.9	Dim
19	1.8	Dim
20	1.8	Dim
21	1.7	Dim
22	1.7	Dim
23	1.7	Dim
24	1.6	Dim
25	1.6	Dim
26	1.6	Dim
27	1.5	Dim
28	1.5	Dim
29	1.4	Dim
30	1.4	Dim
31	1.4	Dim

Planning a trip in October

Is October a good time to visit Carmarthen?

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

3.3

Sightseeing

6th-best month of the year

0.0

Beach & pool

6th-best month of the year

October is a weaker month for outdoor sightseeing in Carmarthen.

What to pack for Carmarthen in October

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

In October, Carmarthen sees daytime highs around 14°C and nights near 10°C. Pack rain gear. Worth having: a warm layer and a windbreaker. About 16 days see rain.

rain geara warm layera windbreaker

Sea temperature near Carmarthen in October

The nearest coast averages about 15°C in October — 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 October

LowModerateHighVery highExtreme

Clear-sky midday UV in October peaks 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

Location & terrain

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.

3 km

170 m

grassland 57%

16 km

358 m

grassland 65%

80 km

878 m

water 48%

treesgrasslandcroplandartificial surfaceswaterwetland

← September Carmarthen year-round climate November →Best places to visit in October

October weather nearby: Llanelli 22 km · Ammanford 23 km · Gorseinon 28 km · Clydach 34 km · Swansea 36 km · Neath 41 km · Briton Ferry 42 km · Maesteg 52 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. 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).

	Avg high (°C)	Avg low (°C)
1	15	11
2	15	11
3	15	11
4	15	11
5	15	11
6	15	11
7	15	10
8	14	10
9	14	10
10	14	10
11	14	10
12	14	10
13	14	10
14	14	10
15	14	10
16	14	10
17	13	10
18	13	9
19	13	9
20	13	9
21	13	9
22	13	9
23	13	9
24	13	9
25	13	9
26	13	9
27	13	9
28	12	9
29	12	9
30	12	9
31	12	8

	Clearer (%)	Cloudier (%)
1	26	74
2	26	74
3	27	73
4	28	72
5	28	72
6	28	72
7	28	72
8	28	72
9	29	71
10	29	71
11	29	71
12	29	71
13	29	71
14	30	70
15	30	70
16	30	70
17	30	70
18	30	70
19	29	71
20	29	71
21	29	71
22	29	71
23	28	72
24	28	72
25	27	73
26	27	73
27	26	74
28	26	74
29	25	75
30	25	75
31	25	75

	Rain chance (%)
1	52
2	52
3	52
4	52
5	52
6	52
7	51
8	51
9	50
10	49
11	49
12	48
13	48
14	48
15	48
16	48
17	49
18	50
19	50
20	51
21	52
22	53
23	54
24	55
25	56
26	56
27	57
28	57
29	58
30	58
31	58

	Dry (%)	Comfortable (%)
1	83	17
2	84	16
3	84	16
4	85	15
5	86	14
6	86	14
7	87	13
8	87	13
9	88	12
10	88	12
11	88	12
12	89	11
13	89	11
14	89	11
15	89	11
16	90	10
17	90	10
18	91	9
19	91	9
20	91	9
21	92	8
22	92	8
23	93	7
24	93	7
25	93	7
26	94	6
27	94	6
28	94	6
29	94	6
30	95	5
31	95	5

	Avg high (°C)	Avg low (°C)
1	15	11
2	15	11
3	15	11
4	15	11
5	15	11
6	15	11
7	15	10
8	14	10
9	14	10
10	14	10
11	14	10
12	14	10
13	14	10
14	14	10
15	14	10
16	14	10
17	13	10
18	13	9
19	13	9
20	13	9
21	13	9
22	13	9
23	13	9
24	13	9
25	13	9
26	13	9
27	13	9
28	12	9
29	12	9
30	12	9
31	12	8

	Clearer (%)	Cloudier (%)
1	26	74
2	26	74
3	27	73
4	28	72
5	28	72
6	28	72
7	28	72
8	28	72
9	29	71
10	29	71
11	29	71
12	29	71
13	29	71
14	30	70
15	30	70
16	30	70
17	30	70
18	30	70
19	29	71
20	29	71
21	29	71
22	29	71
23	28	72
24	28	72
25	27	73
26	27	73
27	26	74
28	26	74
29	25	75
30	25	75
31	25	75

	Rain chance (%)
1	52
2	52
3	52
4	52
5	52
6	52
7	51
8	51
9	50
10	49
11	49
12	48
13	48
14	48
15	48
16	48
17	49
18	50
19	50
20	51
21	52
22	53
23	54
24	55
25	56
26	56
27	57
28	57
29	58
30	58
31	58

	Dry (%)	Comfortable (%)
1	83	17
2	84	16
3	84	16
4	85	15
5	86	14
6	86	14
7	87	13
8	87	13
9	88	12
10	88	12
11	88	12
12	89	11
13	89	11
14	89	11
15	89	11
16	90	10
17	90	10
18	91	9
19	91	9
20	91	9
21	92	8
22	92	8
23	93	7
24	93	7
25	93	7
26	94	6
27	94	6
28	94	6
29	94	6
30	95	5
31	95	5

	Avg high (°C)	Avg low (°C)
1	15	11
2	15	11
3	15	11
4	15	11
5	15	11
6	15	11
7	15	10
8	14	10
9	14	10
10	14	10
11	14	10
12	14	10
13	14	10
14	14	10
15	14	10
16	14	10
17	13	10
18	13	9
19	13	9
20	13	9
21	13	9
22	13	9
23	13	9
24	13	9
25	13	9
26	13	9
27	13	9
28	12	9
29	12	9
30	12	9
31	12	8

	Clearer (%)	Cloudier (%)
1	26	74
2	26	74
3	27	73
4	28	72
5	28	72
6	28	72
7	28	72
8	28	72
9	29	71
10	29	71
11	29	71
12	29	71
13	29	71
14	30	70
15	30	70
16	30	70
17	30	70
18	30	70
19	29	71
20	29	71
21	29	71
22	29	71
23	28	72
24	28	72
25	27	73
26	27	73
27	26	74
28	26	74
29	25	75
30	25	75
31	25	75

	Rain chance (%)
1	52
2	52
3	52
4	52
5	52
6	52
7	51
8	51
9	50
10	49
11	49
12	48
13	48
14	48
15	48
16	48
17	49
18	50
19	50
20	51
21	52
22	53
23	54
24	55
25	56
26	56
27	57
28	57
29	58
30	58
31	58

	Dry (%)	Comfortable (%)
1	83	17
2	84	16
3	84	16
4	85	15
5	86	14
6	86	14
7	87	13
8	87	13
9	88	12
10	88	12
11	88	12
12	89	11
13	89	11
14	89	11
15	89	11
16	90	10
17	90	10
18	91	9
19	91	9
20	91	9
21	92	8
22	92	8
23	93	7
24	93	7
25	93	7
26	94	6
27	94	6
28	94	6
29	94	6
30	95	5
31	95	5