UV and skin index / Boston
UV index in Boston right now
UV 0.1 · Low UV: air 35°F, feels like 32°F, least sun 16:00–18:00.
- Low UV: no protection needed for most skin; daily SPF is still the dermatologists' habit
- Cold: the barrier works harder; skip strong actives tonight if skin feels tight
UV is MET Norway's clear-sky value with the hour's cloud taken out; the label is the WHO category. Weather, not advice: fair skin, children and some medicines burn sooner.
Next 24 hours
| Time | Air | UV index |
|---|---|---|
| 1:00 PM | 35°F | 0.1 |
| 4:00 PM | 42°F | 1.4 |
| 7:00 PM | 47°F | 0.7 |
| 10:00 PM | 46°F | 0 |
| 1:00 AM | 40°F | 0 |
| 4:00 AM | 38°F | 0 |
| 7:00 AM | 37°F | 0 |
| 10:00 AM | 37°F | 0 |
Weather data: MET Norway · updated 1:55 PM · refreshes every 15 minutes
Skin weather in Boston
Boston has real winters: cold, dry outdoor air and heated indoor air pull water from skin, so dryness and chapping peak from December to March. UV is low then but snow reflects it; summer afternoons still reach high UV.
How the index works
MET Norway gives a clear-sky UV index for each hour; cloud takes up to 70% of it away, so the number here is for the sky you have. The WHO categories: low 0–2, moderate 3–5 (sunscreen for time outside), high 6–7 (sunscreen on every uncovered part, reapply), very high 8–10 and extreme 11+ (shade and cover between 10 and 4). Dry air under 30% humidity and cold wind are the other two things the day does to skin.