DermUV

Monthly UV Index

Mexico City, CDMX

Monthly UV Index in Mexico City, CDMX

Average UV in Mexico City is highest during Apr, May, Jun, Jul, Aug and lowest during Jan, Dec. Use this month-by-month guide to plan sunscreen, shade, clothing, and outdoor timing.

Mexico City UV Index by Month

Average UV in Mexico City peaks during Apr, May, Jun, Jul, Aug, when high sun angles combine with longer days. The deceptive months are usually early spring and early fall, when air temperatures stay mild but UV climbs into the high category by mid-morning. Locals often skip sunscreen on cool, overcast days, which is exactly when UV-A continues to drive long-term skin damage. UV in Mexico City is lowest during Jan, Dec.

MonthAvg UVRisk
Jan10.1Very High
Feb11.5Extreme
Mar13.1Extreme
Apr14.2Extreme
May14.5Extreme
Jun14.4Extreme
Jul14.4Extreme
Aug14.4Extreme
Sep13.6Extreme
Oct12.1Extreme
Nov10.5Very High
Dec9.7Very High

Highest UV Months in Mexico City

Peak monthly UV reaches about 14.5 in Apr, May, Jun, Jul, Aug. That is the period when unprotected skin burns fastest, especially near solar noon. Check the live UV index in Mexico City, CDMX before outdoor plans because clouds, ozone, altitude, and reflection can move the real-time number above or below the monthly average.

Lowest UV Months in Mexico City

Monthly UV is lowest in Jan, Dec, around 9.7 on this model. Lower UV does not mean zero UV. UVA can still pass through cloud and glass, and snow, water, or pale concrete can reflect UV back onto exposed skin.

Monthly Sunscreen Guidance for Mexico City

For months that average UV 3 or higher, broad-spectrum SPF 30+, sunglasses, shade, and UPF clothing are the practical baseline. For months in the very-high or extreme range, reapply every two hours outdoors and after swimming or heavy sweat. These are educational estimates.

Related Mexico City UV Pages

Context behind UV Index Mexico City, CDMX

Burn-time figures come from minimal erythemal dose (MED) values published for each Fitzpatrick skin type, divided by the erythemal irradiance at a given UV index. Personal MED varies by roughly 20 percent, so treat every number as a planning range.

Sunscreen labels are tested at 2 mg/cm². Typical real-world application is closer to half that, so DermUV assumes about half the labelled SPF when it estimates protected time.

Cloud cover is not protection. Thin or broken cloud can still pass most incoming UV, and light cloud edges can briefly scatter more UV toward the ground than a clear sky.

Plan outdoor blocks around the peak UV window, usually between 10am and 4pm local time. Shade, UPF fabric, a wide-brim hat, and UV-blocking sunglasses reduce dose more reliably than sunscreen alone.

Reapplication matters more than the SPF number. Reapply roughly every two hours outdoors and immediately after swimming, heavy sweating, or towelling, regardless of what the bottle claims.

UV scale reference

The WHO scale groups UV 1-2 as low, 3-5 as moderate, 6-7 as high, 8-10 as very high, and 11 or above as extreme. Protection is recommended from UV 3 upward, and shade during the middle of the day becomes the priority from UV 8 upward.

A practical routine at moderate-to-high UV is roughly one ounce of broad-spectrum sunscreen for full-body coverage, applied 15 minutes before going out, then reapplied on schedule. Clothing, hats, and shade carry the rest of the load, especially for children and anyone with a history of easy burning.

Keep exploring DermUV

These pages give more depth around uv index mexico city, cdmx, from UV-scale reference material to calculators and city forecasts.

DermUV forecast values come from Open-Meteo UV data (CC BY 4.0) and are refreshed throughout the day.