Port Dinorwic UV Index
Gwynedd — Sun Safety & UV Levels
Port Dinorwic UV Outlook
Port Dinorwic today: UV is forecast to be moderate. UV levels are moderate. consider sunscreen if spending extended time outdoors.
Over the period ahead, the UV pattern in Port Dinorwic stays on the moderate side overall. UV tends to be strongest around the middle of the day, and much lower early and late.
Current UV
UV levels are moderate — consider sunscreen if spending extended time outdoors.
☀️ UV Scale
| 0–2 | Low | Minimal UV risk today; sun protection generally not required. |
| 3–5 | Moderate | UV levels are moderate — consider sunscreen if spending extended time outdoors. This is the guidance for Port Dinorwic today. |
| 6–7 | High | UV levels are high — sunscreen, a hat, and sunglasses recommended. |
| 8–10 | Very High | UV levels are very high — take full precautions when outdoors. |
| 11+ | Extreme | Exceptionally high UV; minimise time in direct sun during peak hours. |
Today’s Hourly UV
14-Day UV Forecast
UV Trend
Forecast context and reference links
To plan confidently, separate what is likely from what is uncertain. Use the supporting guides to understand why the outlook is behaving the way it is for Port Dinorwic.
- 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 UV Index, Solar Radiation, and Cloud.
FAQ
What is the UV index in Port Dinorwic today?
The UV index in Port Dinorwic today is moderate with values around 3. UV strength is shaped by the sun’s elevation, cloud thickness and atmospheric clarity.
When is UV strongest in Port Dinorwic?
The peak UV window in Port Dinorwic is close to midday, as solar elevation peaks. Values rise most in late spring and summer as solar angles increase.
Can UV be high when it’s cloudy in Port Dinorwic?
Yes. Even when it looks cloudy, UV can still reach the surface, particularly through thinner cloud layers. Bright or hazy conditions can still produce notable UV, particularly in late spring and summer.
What does the UV index number mean for sun safety?
The UV index describes the potential for skin damage from ultraviolet radiation. As the number rises, skin damage can occur more quickly in direct sun, so shade, clothing and sunscreen become more important.
Does UV in Port Dinorwic change a lot day to day?
Sometimes, yes. Short-term changes usually come from cloud cover and atmospheric haze, whereas the larger seasonal cycle tracks solar elevation across the year.