Merthyr 14-Day Forecast
Carmarthenshire, Wales
Merthyr Outlook (Next 14 Days)
Across Merthyr today, the day’s character is shaped by spells of rain interspersed with drier intervals. Winds stay fairly light, so any chill is more about cloud and dampness than exposure. Underneath, it stays pleasant overall.
The nearer days offer the firmest steer; beyond that, a changeable pattern overall, with alternating spells and pleasant temperatures overall. Small shifts in the pressure pattern can move features around, so day-to-day refinements are normal. A quick scan of the charts gives the best sense of the regime, while the table helps with day-specific decisions.
Daily Forecast
| Date | High | Low | Condition | Wind | Rain % | Humidity | Visibility | UV | Sunrise | Sunset |
|---|---|---|---|---|---|---|---|---|---|---|
| Thu, 4 Jun | 15°C | 11°C | Moderate rain | 37 km/h | 92% | 87% | 9 km | 6 | 05:01 AM | 09:29 PM |
| Fri, 5 Jun | 14°C | 7°C | Patchy rain nearby | 27 km/h | 73% | 77% | 10 km | 6 | 05:01 AM | 09:30 PM |
| Sat, 6 Jun | 14°C | 11°C | Moderate rain | 41 km/h | 93% | 88% | 8 km | 2 | 05:00 AM | 09:31 PM |
| Sun, 7 Jun | 14°C | 12°C | Moderate rain | 37 km/h | 97% | 92% | 8 km | 5 | 05:00 AM | 09:32 PM |
| Mon, 8 Jun | 14°C | 10°C | Moderate rain | 37 km/h | 91% | 85% | 10 km | 3 | 04:59 AM | 09:33 PM |
| Tue, 9 Jun | 15°C | 10°C | Patchy rain nearby | 32 km/h | 82% | 86% | 10 km | 3 | 04:59 AM | 09:34 PM |
| Wed, 10 Jun | 16°C | 11°C | Patchy rain nearby | 32 km/h | 73% | 89% | 10 km | 3 | 04:58 AM | 09:35 PM |
| Thu, 11 Jun | 17°C | 11°C | Sunny | 10 km/h | 6% | 80% | 10 km | 4 | 04:58 AM | 09:35 PM |
| Fri, 12 Jun | 22°C | 10°C | Partly Cloudy | 13 km/h | 8% | 80% | 10 km | 5 | 04:58 AM | 09:36 PM |
| Sat, 13 Jun | 24°C | 16°C | Partly Cloudy | 21 km/h | 6% | 79% | 10 km | 5 | 04:58 AM | 09:37 PM |
| Sun, 14 Jun | 21°C | 14°C | Patchy rain nearby | 16 km/h | 73% | 87% | 10 km | 4 | 04:57 AM | 09:37 PM |
| Mon, 15 Jun | 22°C | 13°C | Partly Cloudy | 11 km/h | 5% | 84% | 10 km | 5 | 04:57 AM | 09:38 PM |
| Tue, 16 Jun | 21°C | 14°C | Sunny | 16 km/h | 3% | 77% | 10 km | 5 | 04:57 AM | 09:38 PM |
| Wed, 17 Jun | 18°C | 12°C | Partly Cloudy | 24 km/h | 6% | 82% | 10 km | 4 | 04:57 AM | 09:39 PM |
Temperature Trend
Rain Probability
Wind Speed
UV Index
Forecast context and reference links
Across Wales, local effects can shift outcomes even when the national pattern is similar. Coastal exposure, terrain, and airflow direction often explain the difference between a near-miss and a wet day.
- Wales Climate for regional patterns and seasonal tendencies.
- UK Climate Overview for a national baseline and how regions compare.
- Wales for location browsing and regional navigation.
How to interpret confidence
For how forecast reliability changes with lead time, see Forecast Confidence. For transparency on how WeatherEngland sources and updates data, see Methodology.
Background guides
- UK Weather Patterns
- UK Seasonal Weather
- UK Weather Hazards
- UK Weather Safety
- UK Jet Stream
- UK Microclimates
Glossary support
Start with the Weather Glossary. Useful terms for this page include Jet Stream, Air Mass, Zonal Flow, Atmospheric Blocking, Weather Front, and Pressure Trend.
FAQ
How is the weather likely to develop in Merthyr over the next two weeks?
Across the next two weeks in Merthyr, the bigger picture is shaped by a Moderate rain theme on many days. Temperatures hold fairly steady overall. Typical range: highs up to 24°C, lows down to 7°C. Rain-risk signal: 97% at peak (8 higher-risk days). Wind: a windiest-day signal around 41 km/h. UV: peaks around 6 on brighter days. Detail is usually strongest in the first few days. Later values are best read as the likely pattern rather than exact timing.
How should I interpret confidence in the Merthyr 14-day forecast?
Confidence is typically highest in the first 3–5 days. Beyond a week, use it mainly to judge the likely regime (more settled versus more changeable) rather than exact timing — small shifts in storm tracks can move rain bands and wind peaks.
Is there an hourly breakdown for Merthyr today?
Yes — you’ll see hourly detail for today and a day-by-day view for the rest of the 14 days. For planning, combine the two: timing from hourly, direction from daily.
What is the temperature trend in Merthyr over the next two weeks?
Over the next 14 days in Merthyr, Temperatures hold fairly steady overall. Use the Temperature Trend chart to see the direction more clearly than any single day’s number.
What does the ‘headline condition’ mean in the Merthyr forecast?
It summarises the most representative weather type for the day. Local effects and timing shifts still matter — especially around fronts — so treat it as a headline, not a minute-by-minute guarantee.