Carmarthen weather
UK towns · Carmarthenshire, Wales · 51.86°N 4.31°W
Carmarthen, in Carmarthenshire, Wales, has its warmest weather in August, when daytime temperatures average 19.1°C, while January nights are the coldest at around 2.6°C. The town sees roughly 1663mm of rain a year; December is normally the wettest month and April the driest. Figures are averaged from 2020–2024 observations.
Climate averages
| Month | Avg high | Avg low | Rain | Rain days |
|---|---|---|---|---|
| Jan | 7.6° | 2.6° | 145mm | 14 |
| Feb | 8.9° | 3.8° | 176mm | 17 |
| Mar | 10° | 3.8° | 148mm | 16 |
| Apr | 12.6° | 4.8° | 77mm | 11 |
| May | 15.6° | 8.1° | 102mm | 14 |
| Jun | 18.1° | 10.7° | 82mm | 14 |
| Jul | 18.8° | 12.2° | 126mm | 16 |
| Aug | 19.1° | 12.9° | 127mm | 17 |
| Sep | 17.6° | 11.4° | 150mm | 14 |
| Oct | 14.1° | 9.2° | 198mm | 21 |
| Nov | 10.9° | 6.2° | 132mm | 16 |
| Dec | 8.6° | 4.4° | 200mm | 20 |
Carmarthen weather FAQs
What is the warmest month in Carmarthen?
August is typically the warmest month in Carmarthen, with average daytime highs of 19.1°C. Summer afternoons (June–August) average around 18.7°C.
What is the wettest month in Carmarthen?
December is usually the wettest month, with around 200mm of rain over roughly 20 rainy days. April is typically the driest (77mm).
How much does it rain in Carmarthen per year?
Carmarthen receives roughly 1663mm of precipitation per year, spread over about 190 days with at least 1mm of rain (based on 2020–2024 observations).
How cold are winters in Carmarthen?
Winter nights (December–February) in Carmarthen average around 3.6°C, with January typically the coldest month (average low 2.6°C).