Merthyr Tydfil Climate by Month
Merthyr Tydfil, Wales, United Kingdom
Mild summers and cool winters, with rain spread through the year.
Merthyr Tydfil has mild summers and cool winters, with rain spread through the year. Afternoon highs range from 44°F (7°C) in January to 67°F (19°C) in July, and February nights average 35°F (2°C). It gets 58 in (1476 mm) of rain a year, spread across the months. The air is humid, averaging 85% relative humidity.
- Warmest month
- 67°F(19°C)
- Average high, July
- Coldest nights
- 35°F(2°C)
- Average low, February
- Rain per year
- 58 in(1476 mm)
- No clear rainy season
- Humidity
- 85%
- Sunniest: June
Best and worst months in Merthyr Tydfil
Best for weatherThe most comfortable weather comes from June to August, with highs around 65°F (19°C) and about 4.2 in (107 mm) of rain a month.
Least pleasantDecember and January are the least pleasant; December is the coldest, with highs of only 45°F (7°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)
Merthyr Tydfil weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 44°F(7°C) | 35°F(2°C) | 5.7 in(144 mm) | 85% | 0.7 |
| FebFebruary | 44°F(7°C) | 35°F(2°C) | 4.6 in(116 mm) | 86% | 1.4 |
| MarMarch | 48°F(9°C) | 36°F(2°C) | 4.3 in(109 mm) | 88% | 2.5 |
| AprApril | 53°F(12°C) | 39°F(4°C) | 3.6 in(91 mm) | 85% | 3.9 |
| MayMay | 59°F(15°C) | 44°F(7°C) | 3.5 in(88 mm) | 77% | 4.9 |
| JunJuneBest | 64°F(18°C) | 49°F(10°C) | 3.8 in(96 mm) | 77% | 5.2 |
| JulJulyBest | 67°F(19°C) | 53°F(12°C) | 4.2 in(106 mm) | 80% | 4.8 |
| AugAugustBest | 66°F(19°C) | 53°F(12°C) | 4.7 in(119 mm) | 81% | 4.0 |
| SepSeptember | 62°F(17°C) | 49°F(10°C) | 4.2 in(107 mm) | 86% | 2.9 |
| OctOctober | 55°F(13°C) | 45°F(7°C) | 6.3 in(159 mm) | 89% | 1.7 |
| NovNovember | 49°F(10°C) | 40°F(4°C) | 7.0 in(177 mm) | 90% | 0.9 |
| DecDecember | 45°F(7°C) | 36°F(2°C) | 6.5 in(164 mm) | 94% | 0.6 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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