Conditions on this page are recalculated from the latest forecast every time it is opened, for the current date in the location's own time zone.
The UV index peaks around solar noon and is driven by sun angle, altitude, cloud cover and ozone — not by air temperature, which is why people burn on cool, bright days. Pick a destination below for today's hourly UV curve, the peak value and the time it occurs. Each city page converts the number into a decision: how long unprotected skin can stay out, when shade matters most, and which hours are safe for children, fair skin and long outdoor sessions.
UV intensity is governed by solar elevation, altitude, ozone column, cloud cover and surface reflection — not by air temperature. That is why people burn badly on cool, breezy spring days at altitude and on overcast summer afternoons, when thin cloud can still transmit 70–80% of UV. Snow reflects up to 80% of incoming UV and water and sand around 10–25%, effectively adding a second dose from below.
An index value is only useful once it becomes a time. A UV index of 8 burns untanned fair skin in roughly 15–20 minutes; an index of 3 takes over an hour. Each destination page converts today's hourly UV curve into unprotected burn time by skin sensitivity, marks the peak hour, and identifies the windows where shade or cover genuinely matters versus the hours that are safe for long outdoor sessions.
Choose a destination below. Each page shows today's hourly UV index curve, the peak value and the local time it occurs, based on the destination's coordinates and elevation.
Values of 3–5 mean protection is advisable, 6–7 means protection is needed, 8–10 is very high with burn times of about 15–25 minutes for fair skin, and 11 or above is extreme where unprotected skin can burn in under 10 minutes.
Yes. Broken and thin cloud transmits most of the incoming UV, and scattered cloud can briefly push UV above clear-sky values through edge reflection. Cloud lowers temperature far more than it lowers UV, which is what makes overcast days deceptive.
Scores are capped by dealbreakers — heavy rain, dangerous wind, thick fog or hazardous UV pull a day down no matter how pleasant the rest of the numbers look. Forecast data is Open-Meteo; solar and lunar values are computed for this location's own coordinates and time zone. Full details on the methodology page.