Llanelli Climate by Month
Llanelli, Wales, United Kingdom
Mild summers and cool winters, with rain spread through the year.
Llanelli has mild summers and cool winters, with rain spread through the year. July is the warmest month, with highs around 69°F (20°C); January is the coolest at 47°F (9°C), and nights dip to 38°F (3°C). About 46 in (1160 mm) of rain falls in a typical year, with no clear rainy season. The air is humid, averaging 82% relative humidity.
- Warmest month
- 69°F(20°C)
- Average high, July
- Coldest nights
- 38°F(3°C)
- Average low, February
- Rain per year
- 46 in(1160 mm)
- No clear rainy season
- Humidity
- 82%
- Sunniest: June
Best and worst months in Llanelli
Best for weatherJune to August are the best time for weather in Llanelli: highs near 67°F (20°C) and about 3.6 in (91 mm) of rain a month.
Least pleasantDecember and January are the least pleasant; January is the coldest, with highs of only 47°F (9°C).
Comfort combines how close the afternoon high is to 75°F (24°C) with how much rain falls and how humid it is. See where the weather is best in July.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
Llanelli weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 47°F(9°C) | 38°F(4°C) | 4.4 in(112 mm) | 85% | 0.7 |
| FebFebruary | 47°F(9°C) | 38°F(3°C) | 3.3 in(85 mm) | 86% | 1.4 |
| MarMarch | 51°F(10°C) | 40°F(4°C) | 3.0 in(76 mm) | 88% | 2.5 |
| AprApril | 56°F(13°C) | 43°F(6°C) | 2.7 in(68 mm) | 76% | 3.9 |
| MayMay | 61°F(16°C) | 47°F(9°C) | 2.7 in(69 mm) | 77% | 5.0 |
| JunJuneBest | 65°F(19°C) | 53°F(12°C) | 3.2 in(81 mm) | 76% | 5.4 |
| JulJulyBest | 69°F(20°C) | 56°F(14°C) | 3.7 in(93 mm) | 78% | 4.8 |
| AugAugustBest | 68°F(20°C) | 56°F(13°C) | 3.9 in(98 mm) | 79% | 4.1 |
| SepSeptember | 65°F(18°C) | 53°F(11°C) | 3.4 in(86 mm) | 83% | 3.0 |
| OctOctober | 59°F(15°C) | 48°F(9°C) | 5.0 in(127 mm) | 86% | 1.7 |
| NovNovember | 53°F(12°C) | 43°F(6°C) | 5.5 in(139 mm) | 88% | 0.9 |
| DecDecember | 49°F(9°C) | 40°F(4°C) | 5.0 in(126 mm) | 81% | 0.6 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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