UV index in Rio de Janeiro in June
In June, the UV index in Rio de Janeiro typically peaks around 4.8 at midday — moderate on the WHO scale — with individual days reaching 5.3 in recent years. Sun protection is needed around the middle of the day.
How fast would you burn?
Estimated time to sunburn in unprotected midday sun at UV 4.8:
| Skin type | Time to burn |
|---|---|
| I — Very fair | ~28 min |
| II — Fair | ~35 min |
| III — Medium | ~49 min |
| IV — Olive | ~1h 5m |
Estimates from typical minimal erythemal doses — see methodology. Darker types (V–VI) burn slower still. Reflection off water or sand shortens all of these.
What to do about it
- Pack SPF 30+ and use it for extended midday time outside — fair skin can burn in under an hour at these levels.
- Mornings and late afternoons are generally low-risk without protection.
- Sunglasses are worth it: cumulative UV drives cataracts even at moderate levels.
Planning a trip? Check the live UV index in Rio de Janeiro closer to your dates — day-to-day cloud cover moves the real number around this average.
Rio de Janeiro's UV year at a glance
| Month | Typical midday peak | Level |
|---|---|---|
| January | 8.6 | Very high |
| February | 8.7 | Very high |
| March | 7.5 | High |
| April | 6.3 | High |
| May | 5.2 | Moderate |
| June | 4.8 | Moderate |
| July | 4.7 | Moderate |
| August | 5.8 | Moderate |
| September | 7 | High |
| October | 7.3 | High |
| November | 7.8 | High |
| December | 8.2 | Very high |
The strongest month is February (typical peak 8.7); the gentlest is July (typical peak 4.7).
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