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Live forecasts update automatically; written guidance last reviewed 13 June 2026 by the Insight Britain weather desk. Data from national met services via Open-Meteo.
Live data from Open-Meteo · updates automatically ·
The live forecast above gives you the current conditions and hourly outlook for Nelson, Caerphilly. Use it alongside this guide to understand how local geography, seasonal patterns and typical weather affect your day in this South Wales valleys town.
How should I read the live forecast for Nelson?
The live forecast above shows temperature, wind speed, precipitation probability and cloud cover for the next few hours. For Nelson, pay close attention to the wind direction—westerlies often bring moist air from the Bristol Channel. The “feels like” temperature accounts for wind chill, which can be significant on the exposed hillsides around the town.
What is Nelson’s typical climate through the seasons?
Nelson has a temperate maritime climate, similar to much of South Wales. Winters (December to February) are cool and damp, with daytime highs often in the low single digits Celsius and occasional frost in valley bottoms. Rainfall is frequent but not torrential. Springs (March to May) bring milder air, with temperatures gradually rising from around 8–12 °C to 14–17 °C. Summers (June to August) are the warmest period, typically reaching highs in the high teens to low twenties, though direct sunshine can be interrupted by Atlantic cloud. Autumns (September to November) start mild but become progressively cooler and windier, with increasing rainfall from October onwards.
How does local geography affect the weather here?
Nelson sits in the Rhymney Valley, surrounded by the hills of the South Wales Coalfield. This valley shape can trap fog and low cloud, especially in winter and early spring. The town is about 15 miles inland from the Bristol Channel, so coastal moderation is weak; nights can be colder than in Cardiff. Prevailing south-westerly winds are funnelled up the valley, sometimes bringing stronger gusts. The nearby hills, such as Mynydd Bedwellty, can see more rain and lower visibility than the town itself.
When is the best time to visit Nelson, and what should I pack?
The best weather for outdoor walks and visiting nearby attractions such as the Parc Penallta is late spring (May) and early autumn (September), when temperatures are pleasant and rainfall is lower than in winter. Pack layers: a waterproof jacket is useful year-round. In summer, bring a light jumper for cooler evenings. In winter, a warm coat, hat and gloves are essential, along with sturdy footwear for muddy valley paths.
Where else do readers check the weather nearby?
If you are travelling in the area, you might also want to look up forecasts for Blackwood, Caerphilly and Pontypridd. These towns share similar valley influences but can differ slightly in cloud cover and temperature. For a wider view, visit the UK weather hub or the A–Z of UK towns.
What is the weather in Nelson tomorrow?
The live forecast above includes the next 24 hours. Typically, you can expect a mix of cloud and rain or drizzle, especially if a low-pressure system is moving in from the Atlantic. Overnight temperatures may drop a few degrees, with mist forming in the valley.
What is the 10–14 day outlook for Nelson?
Beyond the detailed forecast, general patterns can shift quickly. For Nelson, the 10-day forecast shows trends in temperature and rainfall probability. Check our UK weather warnings for any severe weather affecting the area.
Does it rain a lot in Nelson?
Yes, Nelson receives above-average rainfall for the UK, typical of South Wales valleys. Rain falls on roughly 150–170 days per year, with the wettest months usually October through January. However, many showers are light and short, so outdoor activities are still possible with proper clothing.
Is Nelson affected by snow?
Snowfall is relatively infrequent but possible in winter, especially on higher ground like the nearby hills. When snow does fall, it often melts quickly in the valley. The live forecast above will show any precipitation type changes.