Monday, October 19, 2026 · Puerto Rico
Skin weather in San Juan UV index & humidity today
What today’s weather in San Juan does to your skin – based on current forecast data for UV, humidity and air quality.
Updated Oct 19, 2026, 4:10 AM local time
Today · Temperature26 to 31 °C
Low and high-
UV index
7.7
very high
Peak UV index today: 7.7 – very high.
Very high UV: the WHO advises avoiding the midday sun and reapplying sun protection regularly.
-
Humidity
78%outdoors
humid
Average humidity today: 78%.
Humid air – lighter textures often feel more comfortable today.
-
Pollen
–
No pollen forecast is available for this region.
-
Air quality
17EAQI
good
European Air Quality Index up to 17 – good. Fine dust (PM2.5) averages 2.6 µg/m³.
Clean air – no extra cleansing needed.
Tomorrow
- 26 to 32 °C
- UV 7.8 · very high
- 77% · humid
- Air quality: good
Skin climate in San Juan through the year
When the air in San Juan is driest and when the sun is strongest – based on climate data from recent years.
- In San Juan the average daily temperature stays above 15 °C all year – heating is rarely needed. Outdoor humidity ranges between 77% and 82%.
- All year round the midday sun in San Juan climbs higher than 45° – your shadow is shorter than you are. According to the WHO shadow rule, UV is then usually high.
- July brings the most sunshine, with around 363 hours.
| Month | Sunshine | Midday sun | Humidity outdoors | Indoors when heated | Avg. high |
|---|---|---|---|---|---|
| Jan | 321 h | 50° | 78% | – | 28 °C |
| Feb | 300 h | 58° | 78% | – | 27.8 °C |
| Mar | 341 h | 69° | 77% | – | 28.3 °C |
| Apr | 340 h | 81° | 78% | – | 28.5 °C |
| May | 356 h | 90° | 80% | – | 29.9 °C |
| Jun | 356 h | 85° | 78% | – | 30.8 °C |
| Jul | 363 h | 87° | 80% | – | 30.7 °C |
| Aug | 342 h | 85° | 80% | – | 31.1 °C |
| Sep | 316 h | 74° | 82% | – | 31 °C |
| Oct | 306 h | 62° | 81% | – | 30.8 °C |
| Nov | 292 h | 52° | 82% | – | 29.5 °C |
| Dec | 312 h | 48° | 80% | – | 28.3 °C |
Indoors when heated = humidity when outdoor air is warmed to 21 °C (only months with a daily average below 15 °C). Midday sun = sun angle in mid-month.
Frequently asked questions
What is the UV index in San Juan today?
Today (October 19) the UV index in San Juan reaches up to 7.7 – very high. Very high UV: the WHO advises avoiding the midday sun and reapplying sun protection regularly.
How dry is the air in San Juan today?
Average humidity today: 78%. Humid air – lighter textures often feel more comfortable today.
When is the air driest in San Juan?
In San Juan the average daily temperature stays above 15 °C all year – heating is rarely needed. Outdoor humidity ranges between 77% and 82%.
When is UV strongest in San Juan?
All year round the midday sun in San Juan climbs higher than 45° – your shadow is shorter than you are. According to the WHO shadow rule, UV is then usually high. July brings the most sunshine, with around 363 hours.
Your skin weather, every morning.
Lumée reads UV, humidity, pollen and air quality for your location and turns them into skincare that fits this exact day.
Skin weather nearby
All cities →Data: WDTEC GmbH’s own weather servers – temperature, UV index and humidity from weather models, air quality and pollen from the Copernicus Atmosphere Monitoring Service (CAMS). Ratings: UV per WHO, air quality per European Air Quality Index, pollen per NAB. Skincare tips are general recommendations and do not replace medical advice.