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Weather Carmarthen: Current forecast

Carmarthen / United Kingdom

15.1 °C
Feels like 14 °C
Min 15 °C / Max 18 °C
Weather Carmarthen: Patchy rain possible, 15 °C Patchy rain possible
11.9 km/h WSW
Wind
23 km/h WSW
Gusts
1008 hPa
Pressure
0.1 mm
Precipitation
93 %
Humidity
0
UV index

Pollen (today)

Hazel None
Alder None
Birch None
Oak None
Grass Low
Mugwort Low
Ragweed Low
06:26 / 20:09
Sunrise / Sunset
20:35 / 09:09
Moonrise / Moonset
Waning Moon (87 %)
Moon phase

Updated: Aug 30, 2026, 4:05 CEST Aug 30, 2026, 3:05 BST

Today's Summary

In Carmarthen the weather today is patchy rain possible. The thermometer currently shows 15.1°C. Take an umbrella with you today – you'll probably need it. During the day temperatures will range between 14.7°C and 17.9°C.

Hourly forecast – Carmarthen, today

Aug 30, 04:00
15 °C
Patchy rain possible
Carmarthen Aug 30, 04:00: Patchy rain possible, 15 °C
Aug 30, 05:00
15 °C
Patchy rain possible
Carmarthen Aug 30, 05:00: Patchy rain possible, 15 °C
Aug 30, 06:00
16 °C
Moderate rain at times
Carmarthen Aug 30, 06:00: Moderate rain at times, 16 °C
Aug 30, 07:00
17 °C
Patchy rain possible
Carmarthen Aug 30, 07:00: Patchy rain possible, 17 °C
Aug 30, 08:00
18 °C
Patchy rain possible
Carmarthen Aug 30, 08:00: Patchy rain possible, 18 °C
Aug 30, 09:00
18 °C
Patchy rain possible
Carmarthen Aug 30, 09:00: Patchy rain possible, 18 °C
Aug 30, 10:00
18 °C
Light rain shower
Carmarthen Aug 30, 10:00: Light rain shower, 18 °C
Aug 30, 11:00
18 °C
Light rain shower
Carmarthen Aug 30, 11:00: Light rain shower, 18 °C
Aug 30, 12:00
16 °C
Light rain shower
Carmarthen Aug 30, 12:00: Light rain shower, 16 °C
Aug 30, 13:00
16 °C
Light rain shower
Carmarthen Aug 30, 13:00: Light rain shower, 16 °C
Aug 30, 14:00
16 °C
Light rain shower
Carmarthen Aug 30, 14:00: Light rain shower, 16 °C
Aug 30, 15:00
17 °C
Light rain shower
Carmarthen Aug 30, 15:00: Light rain shower, 17 °C
Aug 30, 16:00
16 °C
Light rain shower
Carmarthen Aug 30, 16:00: Light rain shower, 16 °C
Aug 30, 17:00
16 °C
Light rain shower
Carmarthen Aug 30, 17:00: Light rain shower, 16 °C
Aug 30, 18:00
15 °C
Light rain shower
Carmarthen Aug 30, 18:00: Light rain shower, 15 °C
Aug 30, 19:00
15 °C
Light rain shower
Carmarthen Aug 30, 19:00: Light rain shower, 15 °C
Aug 30, 20:00
15 °C
Light rain shower
Carmarthen Aug 30, 20:00: Light rain shower, 15 °C
Aug 30, 21:00
15 °C
Light rain shower
Carmarthen Aug 30, 21:00: Light rain shower, 15 °C
Aug 30, 22:00
14 °C
Cloudy
Carmarthen Aug 30, 22:00: Cloudy, 14 °C
Aug 30, 23:00
14 °C
Clear
Carmarthen Aug 30, 23:00: Clear, 14 °C
Aug 31, 00:00
13 °C
Patchy rain possible
Carmarthen Aug 31, 00:00: Patchy rain possible, 13 °C
Aug 31, 01:00
13 °C
Patchy rain possible
Carmarthen Aug 31, 01:00: Patchy rain possible, 13 °C
Aug 31, 02:00
13 °C
Patchy rain possible
Carmarthen Aug 31, 02:00: Patchy rain possible, 13 °C
Aug 31, 03:00
13 °C
Patchy rain possible
Carmarthen Aug 31, 03:00: Patchy rain possible, 13 °C
Time
04
05
06
07
08
09
10
11
12
13
14
15
16
17
18
19
20
21
22
23
00
01
02
03
Carmarthen Aug 30, 04:00: Patchy rain possible
Carmarthen Aug 30, 05:00: Patchy rain possible
Carmarthen Aug 30, 06:00: Moderate rain at times
Carmarthen Aug 30, 07:00: Patchy rain possible
Carmarthen Aug 30, 08:00: Patchy rain possible
Carmarthen Aug 30, 09:00: Patchy rain possible
Carmarthen Aug 30, 10:00: Light rain shower
Carmarthen Aug 30, 11:00: Light rain shower
Carmarthen Aug 30, 12:00: Light rain shower
Carmarthen Aug 30, 13:00: Light rain shower
Carmarthen Aug 30, 14:00: Light rain shower
Carmarthen Aug 30, 15:00: Light rain shower
Carmarthen Aug 30, 16:00: Light rain shower
Carmarthen Aug 30, 17:00: Light rain shower
Carmarthen Aug 30, 18:00: Light rain shower
Carmarthen Aug 30, 19:00: Light rain shower
Carmarthen Aug 30, 20:00: Light rain shower
Carmarthen Aug 30, 21:00: Light rain shower
Carmarthen Aug 30, 22:00: Cloudy
Carmarthen Aug 30, 23:00: Clear
Carmarthen Aug 31, 00:00: Patchy rain possible
Carmarthen Aug 31, 01:00: Patchy rain possible
Carmarthen Aug 31, 02:00: Patchy rain possible
Carmarthen Aug 31, 03:00: Patchy rain possible
Temperature (°C)
Chance of rain (%)
26
34
56
49
30
41
56
71
80
76
54
52
57
75
75
78
76
75
22
14
28
27
26
29
Precipitation
0 mm
0.1 mm
0.6 mm
0.4 mm
0.1 mm
0.4 mm
0.6 mm
1.4 mm
1.8 mm
1.4 mm
0.4 mm
0.4 mm
0.6 mm
1.4 mm
1.4 mm
2.1 mm
1.7 mm
1.6 mm
—
—
0 mm
0 mm
0 mm
0 mm
Wind (km/h)
SW
11
S
10
S
14
SW
20
SSW
21
SSW
25
SSW
28
SSW
33
SSW
24
SSW
28
SSW
26
SW
24
SW
23
SSW
21
SSW
25
SSW
19
WSW
16
WSW
15
W
12
W
13
WNW
15
WNW
21
WNW
20
WNW
21
Pressure (hPa)
1007
1007
1007
1007
1007
1007
1007
1006
1006
1005
1005
1005
1004
1004
1004
1003
1003
1004
1004
1005
1006
1007
1007
1008
Humidity (%)
92 %
92 %
91 %
86 %
82 %
79 %
80 %
81 %
93 %
91 %
86 %
83 %
86 %
88 %
89 %
87 %
87 %
87 %
87 %
88 %
89 %
91 %
92 %
93 %
Cloud cover (%)
70 %
89 %
72 %
84 %
78 %
78 %
94 %
100 %
100 %
100 %
100 %
100 %
84 %
100 %
100 %
100 %
100 %
100 %
76 %
25 %
85 %
79 %
74 %
86 %

14-day weather forecast – Carmarthen

14-day trend for Carmarthen: Temperatures stay fairly stable over the period with no big swings. Lows can drop to around 10.5°C at night, with daytime highs up to 18.9°C.

Date
Aug 30
Aug 31
Sep 1
Sep 2
Sep 3
Sep 4
Sep 5
Sep 6
Sep 7
Sep 8
Sep 9
Sep 10
Sep 11
Sep 12
Carmarthen August 30, 2026: Light rain shower
Carmarthen August 31, 2026: Patchy rain possible
Carmarthen September 1, 2026: Patchy rain possible
Carmarthen September 2, 2026: Light rain shower
Carmarthen September 3, 2026: Patchy rain possible
Carmarthen September 4, 2026: Patchy rain possible
Carmarthen September 5, 2026: Partly cloudy
Carmarthen September 6, 2026: Overcast
Carmarthen September 7, 2026: Overcast
Carmarthen September 8, 2026: Patchy rain possible
Carmarthen September 9, 2026: Patchy rain possible
Carmarthen September 10, 2026: Patchy rain possible
Carmarthen September 11, 2026: Patchy rain possible
Carmarthen September 12, 2026: Overcast
Temperature (°C)
Chance of rain (%)
89
38
47
90
75
67
11
17
22
70
73
59
13
14
Precipitation
16.5 mm
0.3 mm
0.4 mm
5.7 mm
1.8 mm
2.4 mm
0 mm
—
—
2.3 mm
4.3 mm
1.7 mm
0 mm
—
Wind max (km/h)
33
24
23
36
32
37
29
27
23
35
41
37
19
13
Date Weather Min °C Max °C Sunrise Sunset Moonrise Moonset Moon phase
August 30, 2026 Carmarthen August 30, 2026: Light rain shower Light rain shower 15 °C 18 °C 06:26 20:09 20:35 09:09 Waning Moon (87 %)
August 31, 2026 Carmarthen August 31, 2026: Patchy rain possible Patchy rain possible 13 °C 16 °C 06:27 20:07 20:47 10:23 Waning Moon (80 %)
September 1, 2026 Carmarthen September 1, 2026: Patchy rain possible Patchy rain possible 13 °C 18 °C 06:29 20:04 21:01 11:40 Waning Moon (70 %)
September 2, 2026 Carmarthen September 2, 2026: Light rain shower Light rain shower 15 °C 19 °C 06:31 20:02 21:20 13:00 Last Quarter (60 %)
September 3, 2026 Carmarthen September 3, 2026: Patchy rain possible Patchy rain possible 16 °C 19 °C 06:32 20:00 21:47 14:21 Last Quarter (50 %)
September 4, 2026 Carmarthen September 4, 2026: Patchy rain possible Patchy rain possible 13 °C 18 °C 06:34 19:58 22:27 15:40 Last Quarter (39 %)
September 5, 2026 Carmarthen September 5, 2026: Partly cloudy Partly cloudy 12 °C 17 °C 06:36 19:55 23:25 16:49 Waning Crescent (29 %)
September 6, 2026 Carmarthen September 6, 2026: Overcast Overcast 13 °C 18 °C 06:37 19:53 Does not rise today 17:41 Waning Crescent (20 %)
September 7, 2026 Carmarthen September 7, 2026: Overcast Overcast 16 °C 19 °C 06:39 19:51 00:43 18:18 Waning Crescent (12 %)
September 8, 2026 Carmarthen September 8, 2026: Patchy rain possible Patchy rain possible 14 °C 18 °C 06:40 19:48 02:13 18:44 Waning Crescent (6 %)
September 9, 2026 Carmarthen September 9, 2026: Patchy rain possible Patchy rain possible 12 °C 16 °C 06:42 19:46 03:47 19:03 New Moon (2 %)
September 10, 2026 Carmarthen September 10, 2026: Patchy rain possible Patchy rain possible 13 °C 16 °C 06:44 19:44 05:20 19:18 New Moon (0 %)
September 11, 2026 Carmarthen September 11, 2026: Patchy rain possible Patchy rain possible 11 °C 16 °C 06:45 19:42 06:51 19:31 New Moon (0 %)
September 12, 2026 Carmarthen September 12, 2026: Overcast Overcast 11 °C 17 °C 06:47 19:39 08:20 19:44 New Moon (3 %)
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