Monday, October 19, 2026 · United States
Skin weather in Philadelphia UV index & humidity today
What today’s weather in Philadelphia 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 · Temperature4 to 17 °C
Low and high-
UV index
4.4
moderate
Peak UV index today: 4.4 – moderate.
From UV 3, the WHO recommends sun protection: sunscreen with SPF and shade around midday.
-
Humidity
33%indoors when heated
dry
Outdoors 72% humidity – heat it to 21 °C and only around 33% is left indoors.
Dry air draws moisture from your skin – a richer moisturiser makes sense today.
-
Pollen
–
No pollen forecast is available for this region.
-
Air quality
48EAQI
moderate
European Air Quality Index up to 48 – moderate. Fine dust (PM2.5) averages 20 µg/m³.
Fine dust settles on the skin – cleanse thoroughly but gently in the evening.
Tomorrow
- 7 to 20 °C
- UV 4.4 · moderate
- 34% · dry
- Air quality: fair
Skin climate in Philadelphia through the year
When the air in Philadelphia is driest and when the sun is strongest – based on climate data from recent years.
- Indoor air in Philadelphia is driest in January: heated to 21 °C, humidity indoors drops to around 19%.
- From November to April, the average daily temperature stays below 15 °C – the time when heating is usually on.
- From March to September, the midday sun climbs higher than 45° – your shadow is then 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 | 185 h | 29° | 63% | 19% | 5.6 °C |
| Feb | 192 h | 37° | 62% | 20% | 7.7 °C |
| Mar | 256 h | 47° | 57% | 26% | 13.7 °C |
| Apr | 281 h | 59° | 57% | 36% | 18.7 °C |
| May | 306 h | 69° | 63% | – | 23.4 °C |
| Jun | 338 h | 73° | 64% | – | 28.5 °C |
| Jul | 363 h | 72° | 70% | – | 31 °C |
| Aug | 317 h | 64° | 69% | – | 29.4 °C |
| Sep | 258 h | 52° | 70% | – | 26 °C |
| Oct | 248 h | 40° | 68% | – | 20.5 °C |
| Nov | 221 h | 31° | 62% | 30% | 13.7 °C |
| Dec | 175 h | 27° | 66% | 23% | 8 °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 Philadelphia today?
Today (October 19) the UV index in Philadelphia reaches up to 4.4 – moderate. From UV 3, the WHO recommends sun protection: sunscreen with SPF and shade around midday.
How dry is the air in Philadelphia today?
Outdoors 72% humidity – heat it to 21 °C and only around 33% is left indoors. Dry air draws moisture from your skin – a richer moisturiser makes sense today.
When is the air driest in Philadelphia?
Indoor air in Philadelphia is driest in January: heated to 21 °C, humidity indoors drops to around 19%. From November to April, the average daily temperature stays below 15 °C – the time when heating is usually on.
When is UV strongest in Philadelphia?
From March to September, the midday sun climbs higher than 45° – your shadow is then shorter than you are. According to the WHO shadow rule, UV is then usually high. July brings the most sunshine, with around 363 hours.
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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.