Monday, October 19, 2026 · Italy
Skin weather in Siena UV index, humidity & pollen today
What today’s weather in Siena does to your skin – based on current forecast data for UV, humidity, pollen and air quality.
Updated Oct 19, 2026, 10:10 AM local time
Today · Temperature10 to 23 °C
Low and high-
UV index
3.9
moderate
Peak UV index today: 3.9 – moderate.
From UV 3, the WHO recommends sun protection: sunscreen with SPF and shade around midday.
-
Humidity
76%outdoors
humid
Average humidity today: 76%.
Humid air – lighter textures often feel more comfortable today.
-
Pollen
None
No significant pollen today.
-
Air quality
36EAQI
fair
European Air Quality Index up to 36 – fair. Fine dust (PM2.5) averages 7.2 µg/m³.
Clean air – no extra cleansing needed.
Tomorrow
- 10 to 21 °C
- UV 3.7 · moderate
- 80% · humid
- Pollen: none
- Air quality: fair
Skin climate in Siena through the year
When the air in Siena is driest and when the sun is strongest – based on climate data from recent years.
- Indoor air in Siena is driest in January: heated to 21 °C, humidity indoors drops to around 32%.
- From November to April, the average daily temperature stays below 15 °C – the time when heating is usually on.
- From April 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 413 hours.
| Month | Sunshine | Midday sun | Humidity outdoors | Indoors when heated | Avg. high |
|---|---|---|---|---|---|
| Jan | 191 h | 25° | 81% | 32% | 10 °C |
| Feb | 196 h | 33° | 78% | 34% | 12.5 °C |
| Mar | 288 h | 44° | 72% | 35% | 14.7 °C |
| Apr | 324 h | 56° | 71% | 40% | 17.3 °C |
| May | 364 h | 65° | 74% | – | 21.7 °C |
| Jun | 398 h | 70° | 68% | – | 28.2 °C |
| Jul | 413 h | 68° | 63% | – | 31.2 °C |
| Aug | 382 h | 60° | 64% | – | 30.9 °C |
| Sep | 302 h | 49° | 72% | – | 25.6 °C |
| Oct | 255 h | 37° | 78% | – | 20.9 °C |
| Nov | 197 h | 28° | 82% | 42% | 14.6 °C |
| Dec | 171 h | 23° | 86% | 35% | 11 °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 Siena today?
Today (October 19) the UV index in Siena reaches up to 3.9 – moderate. From UV 3, the WHO recommends sun protection: sunscreen with SPF and shade around midday.
How dry is the air in Siena today?
Average humidity today: 76%. Humid air – lighter textures often feel more comfortable today.
How high is the pollen count in Siena today?
No significant pollen today.
When is the air driest in Siena?
Indoor air in Siena is driest in January: heated to 21 °C, humidity indoors drops to around 32%. From November to April, the average daily temperature stays below 15 °C – the time when heating is usually on.
When is UV strongest in Siena?
From April 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 413 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.