Harleston UV Index
Norfolk — Sun Safety & UV Levels
Harleston UV Outlook
In Harleston today, UV levels are likely to remain low. Minimal UV risk today; sun protection is generally not required.
The longer-range UV signal for Harleston points to moderate levels for most days. UV can be higher near water, on sand, and on snow due to reflection.
Current UV
Minimal UV risk today; sun protection generally not required.
☀️ 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 Harleston 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
For Harleston, the forecast is best read as a combination of short-range detail and broader regime. The first few days carry the highest timing confidence, while later periods describe direction and pattern.
- England Climate for regional patterns and seasonal tendencies.
- UK Climate Overview for a national baseline and how regions compare.
- England 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 Harleston today?
In Harleston today, the UV index is moderate at roughly 3 around midday. UV levels depend on sun angle, the type and depth of cloud, and how clear the air is.
When is UV strongest in Harleston?
Harleston sees its strongest UV late morning into early afternoon, when the sun is highest. The seasonal peak comes in late spring and summer, when the sun is highest.
Can UV be high when it’s cloudy in Harleston?
Yes. Thin, broken or bright overcast can still let through a meaningful amount of ultraviolet radiation. In summer, it’s possible to pick up exposure even without clear blue skies, especially around midday.
What does the UV index number mean for sun safety?
It’s a measure of how strong ultraviolet radiation is at the surface. Higher values mean shorter exposure times before skin starts to burn, so protection matters more when the index climbs.
Does UV in Harleston change a lot day to day?
It can vary, especially in changeable weather. Daily variation is often down to cloud thickness and air clarity; the seasonal pattern changes more gradually as daylight and solar angle increase into summer.