UV index in Mexico City in July
In July, the UV index in Mexico City typically peaks around 9 at midday — very high on the WHO scale — with individual days reaching 9.8 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 9:
| Skin type | Time to burn |
|---|---|
| I — Very fair | ~15 min |
| II — Fair | ~19 min |
| III — Medium | ~26 min |
| IV — Olive | ~33 min |
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
- Treat midday sun as hostile: SPF 50, a real hat, UV-blocking sunglasses, and shade between 11am and 3pm.
- Fair skin (types I–II) can burn in 15–25 minutes at these levels — reapply sunscreen strictly every 2 hours.
- UPF-rated clothing outperforms sunscreen for long days out — consider a sun shirt for beach or boat days.
Planning a trip? Check the live UV index in Mexico City closer to your dates — day-to-day cloud cover moves the real number around this average.
Mexico City's UV year at a glance
| Month | Typical midday peak | Level |
|---|---|---|
| January | 6.7 | High |
| February | 7.9 | High |
| March | 9.2 | Very high |
| April | 9.7 | Very high |
| May | 9.7 | Very high |
| June | 8.6 | Very high |
| July | 9 | Very high |
| August | 9.4 | Very high |
| September | 8.6 | Very high |
| October | 7.7 | High |
| November | 7.1 | High |
| December | 6.4 | High |
The strongest month is April (typical peak 9.7); the gentlest is December (typical peak 6.4).
← June · Mexico City live · August →
☀️ Get tomorrow's UV before it gets you
One short email each morning with your city's peak UV, when it hits, and whether you need sunscreen that day. Free, no spam, unsubscribe anytime.