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UV Index in Ireland

Live UV forecast for 43 cities

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UV climate of Ireland: overview

Ireland stretches from 51.8117° to 54.95° latitude (Northern hemisphere), so UV conditions differ a lot from region to region. The clear-sky UV index reaches ≈ 7.1 in Ballincollig (peak in June), while in Letterkenny the yearly maximum is only ≈ 6.8.

UV index by month by climate zone

ZoneCitiesJFMAMJJASONDPeak
Temperate43 1.5 2.5 3.9 5.5 6.5 7 6.8 6 4.8 3.4 2.2 1.4 7

Calculated clear-sky noon peaks at the average latitude of each zone. Real values vary with clouds, altitude and ozone.

Sunniest cities in Ireland (highest UV)

Ballincollig · 7.1 in June Carrigaline · 7.1 in June Cluain Meala · 7.1 in June Cork · 7.1 in June Douglas · 7.1 in June

Cities with the mildest sun

Letterkenny · max 6.8 Sligo · max 6.9 Navan · max 6.9 Dundalk · max 6.9 Drogheda · max 6.9

When do you need SPF in Ireland?

Using Dublin as a reference: the UV index reaches 6+ in May, June, July and August. In the sunniest zones (see table) SPF 30–50+ is needed almost year-round; in the mildest — only in late spring and summer.

FAQ: UV index in Ireland

What is the highest UV index in Ireland?

The calculated clear-sky maximum is ≈ 7.1 — in Ballincollig around June. Values above this occur only near the equator and in high mountains.

Which city in Ireland is the sunniest?

Ballincollig (peak ≈ 7.1), followed by Carrigaline and Cluain Meala. The mildest sun is in Letterkenny (max ≈ 6.8).

When is SPF needed in Ireland?

In Dublin and similar latitudes the UV reaches 6+ in May, June, July and August: use SPF 30–50+ on sunny days. Protection is advised from UV 3.

Is UV 11+ possible in Ireland?

No — the local maximum is ≈ 7.1. UV 11+ occurs only near the equator, in deserts and high mountains.