Average annual temperature is 11.3 °C
Absolute maximum temperature: 27.7 °C
Absolute minimum temperature: -4 °C
Number of sunny days: 93
Number of rainy days: 271
Number of snow days: 1
Average annual precipitation: 1800 mm
Look at detailed online map of Carmarthen
* Weather data for Carmarthen United Kingdom is based on climate observations for 2023 year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Absolute maximum temperature (°C) | 12 | 13.9 | 13.6 | 16.1 | 21.5 | 26.8 | 23.4 | 23.4 | 27.7 | 19.5 | 14.1 | 12.6 |
| Average daytime temperature (°C) | 8.2 | 9.4 | 9.6 | 12.4 | 17.2 | 21.7 | 18.1 | 18.6 | 19.9 | 14.8 | 10.6 | 10 |
| Average temperature (°C) | 5.8 | 6.5 | 7.2 | 8.9 | 12.9 | 17.5 | 15.6 | 15.8 | 16.7 | 12.5 | 8.3 | 8.2 |
| Average night temperature (°C) | 3.1 | 3.4 | 4.8 | 5.1 | 8.6 | 12.7 | 12.7 | 13 | 13.4 | 10.4 | 6.1 | 6 |
| Absolute minimum temperature (°C) | -2.8 | -1.8 | -0.7 | 1.3 | 5.9 | 8 | 9 | 9.5 | 5.9 | 4.5 | -2.2 | -4 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 9.1 | 10.8 | 12.9 | 14.8 | 16.3 | 16.7 | 16.6 | 15.5 | 13.6 | 11.6 | 9.7 | 8.1 |
| Daylight mean duration (h) | 8.4 | 10 | 11.9 | 13.9 | 15.7 | 16.6 | 16.2 | 14.6 | 12.7 | 10.7 | 8.9 | 7.9 |
| Daylight minimum duration (h) | 7.9 | 9.1 | 10.9 | 13 | 14.9 | 16.4 | 15.5 | 13.7 | 11.7 | 9.7 | 8.2 | 7.8 |
| Sunshine mean duration (h) | 4.3 | 5.1 | 6.1 | 8.2 | 11.8 | 12.2 | 9.6 | 8.8 | 7.5 | 5.5 | 4.8 | 3.5 |
| Precipitation (mm) | 193 | 31 | 272 | 80 | 56 | 63 | 207 | 155 | 175 | 167 | 134 | 267 |
| Sunny days | 9 | 15 | 5 | 9 | 16 | 14 | 1 | 9 | 5 | 7 | 3 | |
| Rainy days | 21 | 13 | 26 | 21 | 15 | 16 | 31 | 30 | 21 | 26 | 23 | 28 |
| Snow days | 1 |
The best time to visit Carmarthen during the most sunny months:
Months with the longest average daylight duration in Carmarthen:
The largest precipitation sum in Carmarthen is at