Callaghanstown UV Index
Derry and Strabane — Sun Safety & UV Levels
Callaghanstown UV Outlook
Callaghanstown today: UV is forecast to be moderate. UV levels are moderate. consider sunscreen if spending extended time outdoors.
Over the next 14 days, UV levels in Callaghanstown are expected to stay mostly moderate. If you’re outdoors for a while, shade, a hat and sunglasses can help reduce exposure.
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 Callaghanstown 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
Forecast charts summarise likely conditions, but day-to-day outcomes in the UK often depend on how the larger pressure pattern evolves. Use the context links below to interpret the signal more reliably.
- Northern Ireland Climate for regional patterns and seasonal tendencies.
- UK Climate Overview for a national baseline and how regions compare.
- Northern Ireland 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 Callaghanstown today?
Today in Callaghanstown, UV levels are moderate and sits near 3 at its peak. Ultraviolet intensity is controlled mainly by the height of the sun, cloud cover and air clarity.
When is UV strongest in Callaghanstown?
UV in Callaghanstown is strongest around the middle of the day, when the sun reaches its highest point. Levels are also highest in late spring and summer, when the sun is higher in the sky across the UK.
Can UV be high when it’s cloudy in Callaghanstown?
Yes — cloud is not a guarantee of low UV. Cloud doesn’t always block UV effectively — especially with patchy cloud and brighter summer light. This is most relevant in summer and around the middle of the day.
What does the UV index number mean for sun safety?
The number indicates how quickly unprotected skin may be affected in sunlight. A higher index indicates faster potential skin damage in sunshine; sensible protection becomes more worthwhile as values increase.
Does UV in Callaghanstown change a lot day to day?
It can. Day-to-day swings are mainly driven by cloud patterns, haze and air mass changes, while seasonal shifts are slower and follow the sun’s height through the year.