Isla Mujeres, Mexico UV Index in September
The average UV index in Isla Mujeres, Mexico in September is about 9.7 (Very High), peaking near 12 at midday on clear days. Fair skin (Type II) can burn in roughly 9 minutes without sunscreen. SPF 50+ sunscreen, protective clothing, hat and sunglasses. Minimise midday sun exposure.
What is the UV index in Isla Mujeres, Mexico in September?
Average UV
9.7
Very High
Midday Peak
12
Clear-sky estimate
Fair Skin Burn Time
9 min
Type II, no sunscreen
How long can you stay in the sun in Isla Mujeres, Mexico in September?
| Skin type | Time to first burn | With SPF 30 |
|---|---|---|
| Type 1 | 6 min | up to 180 min |
| Type 2 | 9 min | up to 240 min |
| Type 3 | 15 min | up to 240 min |
| Type 4 | 25 min | up to 240 min |
| Type 5 | 37 min | up to 240 min |
| Type 6 | 56 min | up to 240 min |
Estimates based on Isla Mujeres, Mexico's latitude and typical September sun angle. Cloud cover, altitude and reflection from water or sand can raise or lower the real UV. Check the live forecast before long days outside.
Isla Mujeres, Mexico UV Index by Month
When is the UV index highest and lowest in Isla Mujeres, Mexico?
Highest: May (about 10). Lowest: December (about 8.2).
| Month | Average UV | Midday peak | Level | Fair skin burn |
|---|---|---|---|---|
| January | 8.3 | 10.8 | Very High | 11 min |
| February | 8.9 | 11.6 | Very High | 10 min |
| March | 9.5 | 12 | Very High | 9 min |
| April | 9.9 | 12 | Very High | 9 min |
| May | 10 | 12 | Very High | 9 min |
| June | 10 | 12 | Very High | 9 min |
| July | 10 | 12 | Very High | 9 min |
| August | 10 | 12 | Very High | 9 min |
| September | 9.7 | 12 | Very High | 9 min |
| October | 9.1 | 11.8 | Very High | 10 min |
| November | 8.5 | 11.1 | Very High | 11 min |
| December | 8.2 | 10.7 | Very High | 11 min |
Common questions about UV in Isla Mujeres, Mexico in September
Do you need sunscreen in Isla Mujeres, Mexico in September?
Yes. A UV index of 9.7 is Very High, so use SPF 30+ on exposed skin between 10am and 4pm and reapply every two hours.
Can you tan in Isla Mujeres, Mexico in September?
Yes, UV of 9.7 is strong enough to tan. Fair skin can burn in about 9 minutes, so build exposure slowly and use sunscreen.
What time of day is UV strongest in Isla Mujeres, Mexico?
UV peaks around solar noon, roughly 11am to 2pm local time, when it can reach about 12 in September. Mornings and late afternoons are safest.
Is September a good month to visit Isla Mujeres, Mexico for the sun?
September averages UV 9.7, compared with a yearly high of 10 in May and a low of 8.2 in December. Darker skin (Type VI) can burn in about 56 minutes at this level.