Live UV forecast for 223 cities
Belgium stretches from 49.6833° to 51.4003° latitude (Northern hemisphere), so UV conditions differ a lot from region to region. The clear-sky UV index reaches ≈ 7.3 in Arlon (peak in June), while in Zwijndrecht the yearly maximum is only ≈ 7.2.
| Zone | Cities | J | F | M | A | M | J | J | A | S | O | N | D | Peak |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Temperate | 223 | 1.8 | 2.8 | 4.2 | 5.8 | 6.7 | 7.2 | 7 | 6.2 | 5.1 | 3.7 | 2.5 | 1.7 | 7.2 |
Calculated clear-sky noon peaks at the average latitude of each zone. Real values vary with clouds, altitude and ozone.
Using Brussels 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.
The calculated clear-sky maximum is ≈ 7.3 — in Arlon around June. Values above this occur only near the equator and in high mountains.
Arlon (peak ≈ 7.3), followed by Marche-en-Famenne and Walcourt. The mildest sun is in Zwijndrecht (max ≈ 7.2).
In Brussels 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.
No — the local maximum is ≈ 7.3. UV 11+ occurs only near the equator, in deserts and high mountains.