Chamonix weather in September
In September, Chamonix sees average daytime highs of 14°C and overnight lows near 4°C, with 123 mm of precipitation across 15.1 wet days and about 12.3 hours of daylight. It is the 4th-warmest and 11th-wettest month of the year here.
Highs ease over the month, from about 15°C in the first days to 12°C by the end. The sky is clear or mostly clear about 27% of the time in September, and the air most often feels dry.
Daylight stretches from about 13 h 06 min at the start of September to 11 h 30 min by month's end. Set against the rest of the year, September is Chamonix's 6th-clearest and 10th-windiest month. For the whole year in context, see Chamonix's year-round climate.
- Daytime high
- 14°
- 4th warmest
- Overnight low
- 4°
- 9th coldest
- Precipitation
- 123 mm
- 15.1 wet days
- Daylight
- 12 h 18 min
- 6:17 AM – 6:36 PM
- Cloud cover
- 60%
- 6th clearest
- Wind
- 4 km/h
- 10th windiest
- Solar energy
- 3.98 kWh/m²
- Travel score
- 3.5
- out of 10
Chamonix is commune in Haute-Savoie, France.
- Density
- 91/km²
- people per km²
- Founded
- 1091
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in September
Highs ease over the month, from about 15°C in the first days to 12°C by the end.
A typical September day in Chamonix reaches about 14°C in the afternoon and slips back to 4°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 8°C and 19°C. Set against its neighbours, September runs about 4°C cooler than August and about 4°C warmer than October.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 16 | 16 | 16 | 15 | 15 | 15 | 15 | 15 | 15 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 12 | 12 | 12 | 12 | 12 | 12 |
| Avg low (°C) | 6 | 6 | 6 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 2 | 2 | 2 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 16 | 6 |
| 2 | 16 | 6 |
| 3 | 16 | 6 |
| 4 | 15 | 5 |
| 5 | 15 | 5 |
| 6 | 15 | 5 |
| 7 | 15 | 5 |
| 8 | 15 | 5 |
| 9 | 15 | 5 |
| 10 | 14 | 5 |
| 11 | 14 | 4 |
| 12 | 14 | 4 |
| 13 | 14 | 4 |
| 14 | 14 | 4 |
| 15 | 14 | 4 |
| 16 | 14 | 4 |
| 17 | 13 | 4 |
| 18 | 13 | 4 |
| 19 | 13 | 3 |
| 20 | 13 | 3 |
| 21 | 13 | 3 |
| 22 | 13 | 3 |
| 23 | 13 | 3 |
| 24 | 13 | 3 |
| 25 | 12 | 3 |
| 26 | 12 | 3 |
| 27 | 12 | 3 |
| 28 | 12 | 2 |
| 29 | 12 | 2 |
| 30 | 12 | 2 |
How September really feels in Chamonix
Once humidity and wind are folded in, September averages 0 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.
September sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.
Chamonix weather by month
How September compares with the rest of the year at a glance. September is the 4th-warmest and 11th-wettest month here — the current month is highlighted below.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | -3° / -11° | 174 | 13.6 | 13.9 | 8.9 | 0.0 |
| Feb | -1° / -10° | 144 | 11.9 | 12.3 | 10 | 0.0 |
| Mar | 3° / -6° | 142 | 13.9 | 13.2 | 11.6 | 0.0 |
| Apr | 7° / -3° | 124 | 15.4 | 10.3 | 13.3 | 0.7 |
| May | 12° / 2° | 182 | 20.1 | 5.7 | 14.7 | 2.3 |
| Jun | 16° / 6° | 163 | 19.4 | 1 | 15.5 | 3.8 |
| Jul | 18° / 8° | 167 | 19.1 | 0.5 | 15.2 | 4.7 |
| Aug | 17° / 7° | 157 | 17.8 | 0.3 | 14 | 4.7 |
| Sep | 14° / 4° | 123 | 15.1 | 2.1 | 12.3 | 3.5 |
| Oct | 10° / 0° | 121 | 12.7 | 4.8 | 10.7 | 2.0 |
| Nov | 3° / -6° | 146 | 13.7 | 11.5 | 9.3 | 0.1 |
| Dec | -2° / -10° | 178 | 14 | 14 | 8.5 | 0.0 |
Cloud cover in September
The sky is clear or mostly clear about 27% of the time in September.
Beyond those clear spells, partly cloudy skies cover about 18% of September, with mostly cloudy or overcast conditions the remaining 56%.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 48 | 47 | 47 | 48 | 49 | 48 | 49 | 49 | 48 | 48 | 48 | 48 | 46 | 46 | 46 | 44 | 44 | 43 | 42 | 41 | 41 | 41 | 42 | 41 | 41 | 41 | 41 | 41 | 40 | 40 |
| Cloudier (%) | 52 | 53 | 53 | 52 | 51 | 52 | 51 | 51 | 52 | 52 | 52 | 52 | 54 | 54 | 54 | 56 | 56 | 57 | 58 | 59 | 59 | 59 | 58 | 59 | 59 | 59 | 59 | 59 | 60 | 60 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 48 | 52 |
| 2 | 47 | 53 |
| 3 | 47 | 53 |
| 4 | 48 | 52 |
| 5 | 49 | 51 |
| 6 | 48 | 52 |
| 7 | 49 | 51 |
| 8 | 49 | 51 |
| 9 | 48 | 52 |
| 10 | 48 | 52 |
| 11 | 48 | 52 |
| 12 | 48 | 52 |
| 13 | 46 | 54 |
| 14 | 46 | 54 |
| 15 | 46 | 54 |
| 16 | 44 | 56 |
| 17 | 44 | 56 |
| 18 | 43 | 57 |
| 19 | 42 | 58 |
| 20 | 41 | 59 |
| 21 | 41 | 59 |
| 22 | 41 | 59 |
| 23 | 42 | 58 |
| 24 | 41 | 59 |
| 25 | 41 | 59 |
| 26 | 41 | 59 |
| 27 | 41 | 59 |
| 28 | 41 | 59 |
| 29 | 40 | 60 |
| 30 | 40 | 60 |
Chance of precipitation in September
Chamonix gets around 123 mm of rain and snow over 15.1 wet days in September. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable precipitation averages around 51% and peaks near 53% on the wettest days, and about 2 days bring snow.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 52 | 51 | 51 | 52 | 52 | 52 | 52 | 52 | 53 | 53 | 53 | 53 | 53 | 53 | 53 | 53 | 53 | 52 | 52 | 51 | 50 | 50 | 49 | 49 | 48 | 48 | 48 | 48 | 47 | 47 |
| Snow chance (%) | 3 | 3 | 3 | 3 | 4 | 4 | 4 | 5 | 5 | 5 | 6 | 6 | 6 | 7 | 7 | 8 | 8 | 8 | 9 | 9 | 9 | 9 | 9 | 10 | 10 | 10 | 10 | 10 | 11 | 11 |
| Rain chance (%) | Snow chance (%) | |
|---|---|---|
| 1 | 52 | 3 |
| 2 | 51 | 3 |
| 3 | 51 | 3 |
| 4 | 52 | 3 |
| 5 | 52 | 4 |
| 6 | 52 | 4 |
| 7 | 52 | 4 |
| 8 | 52 | 5 |
| 9 | 53 | 5 |
| 10 | 53 | 5 |
| 11 | 53 | 6 |
| 12 | 53 | 6 |
| 13 | 53 | 6 |
| 14 | 53 | 7 |
| 15 | 53 | 7 |
| 16 | 53 | 8 |
| 17 | 53 | 8 |
| 18 | 52 | 8 |
| 19 | 52 | 9 |
| 20 | 51 | 9 |
| 21 | 50 | 9 |
| 22 | 50 | 9 |
| 23 | 49 | 9 |
| 24 | 49 | 10 |
| 25 | 48 | 10 |
| 26 | 48 | 10 |
| 27 | 48 | 10 |
| 28 | 48 | 10 |
| 29 | 47 | 11 |
| 30 | 47 | 11 |
Humidity in September
Most of September feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, September lands in the dry band about 100% of days. It rarely turns muggy — the humid and sticky bands barely register.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 |
| Dry (%) | |
|---|---|
| 1 | 100 |
| 2 | 100 |
| 3 | 100 |
| 4 | 100 |
| 5 | 100 |
| 6 | 100 |
| 7 | 100 |
| 8 | 100 |
| 9 | 100 |
| 10 | 100 |
| 11 | 100 |
| 12 | 100 |
| 13 | 100 |
| 14 | 100 |
| 15 | 100 |
| 16 | 100 |
| 17 | 100 |
| 18 | 100 |
| 19 | 100 |
| 20 | 100 |
| 21 | 100 |
| 22 | 100 |
| 23 | 100 |
| 24 | 100 |
| 25 | 100 |
| 26 | 100 |
| 27 | 100 |
| 28 | 100 |
| 29 | 100 |
| 30 | 100 |
Wind in September
Winds average 4 km/h in September.
Across September, daily wind ranges from about 4 km/h on the calmest days to 4 km/h at its breeziest. It stays fairly steady from day to day.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (km/h) | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 |
| Feels | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm |
| Wind speed (km/h) | Feels | |
|---|---|---|
| 1 | 4 | calm |
| 2 | 4 | calm |
| 3 | 4 | calm |
| 4 | 4 | calm |
| 5 | 4 | calm |
| 6 | 4 | calm |
| 7 | 4 | calm |
| 8 | 4 | calm |
| 9 | 4 | calm |
| 10 | 4 | calm |
| 11 | 4 | calm |
| 12 | 4 | calm |
| 13 | 4 | calm |
| 14 | 4 | calm |
| 15 | 4 | calm |
| 16 | 4 | calm |
| 17 | 4 | calm |
| 18 | 4 | calm |
| 19 | 4 | calm |
| 20 | 4 | calm |
| 21 | 4 | calm |
| 22 | 4 | calm |
| 23 | 4 | calm |
| 24 | 4 | calm |
| 25 | 4 | calm |
| 26 | 4 | calm |
| 27 | 4 | calm |
| 28 | 4 | calm |
| 29 | 4 | calm |
| 30 | 4 | calm |
Sunrise & sunset in September
Daylight runs from about 13 h 06 min at the start of September to 11 h 30 min by month's end. The lit band spans sunrise to sunset each day.
Days shrink by about 96 minutes over September. Sunrise moves from 5:58 AM to 6:36 AM, and sunset from 7:06 PM to 6:08 PM.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 13.1 | 13.1 | 13.0 | 13.0 | 12.9 | 12.9 | 12.8 | 12.8 | 12.7 | 12.7 | 12.6 | 12.5 | 12.5 | 12.4 | 12.4 | 12.3 | 12.3 | 12.2 | 12.2 | 12.1 | 12.0 | 12.0 | 11.9 | 11.9 | 11.8 | 11.8 | 11.7 | 11.7 | 11.6 | 11.5 |
| Sunrise (AM) | 5:58 | 5:59 | 6:01 | 6:02 | 6:03 | 6:04 | 6:06 | 6:07 | 6:08 | 6:10 | 6:11 | 6:12 | 6:13 | 6:15 | 6:16 | 6:17 | 6:19 | 6:20 | 6:21 | 6:22 | 6:24 | 6:25 | 6:26 | 6:28 | 6:29 | 6:30 | 6:32 | 6:33 | 6:34 | 6:36 |
| Sunset (PM) | 7:06 | 7:04 | 7:03 | 7:01 | 6:59 | 6:57 | 6:55 | 6:53 | 6:51 | 6:49 | 6:47 | 6:45 | 6:43 | 6:40 | 6:38 | 6:36 | 6:34 | 6:32 | 6:30 | 6:28 | 6:26 | 6:24 | 6:22 | 6:20 | 6:18 | 6:16 | 6:14 | 6:12 | 6:10 | 6:08 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 13.1 | 5:58 | 7:06 |
| 2 | 13.1 | 5:59 | 7:04 |
| 3 | 13.0 | 6:01 | 7:03 |
| 4 | 13.0 | 6:02 | 7:01 |
| 5 | 12.9 | 6:03 | 6:59 |
| 6 | 12.9 | 6:04 | 6:57 |
| 7 | 12.8 | 6:06 | 6:55 |
| 8 | 12.8 | 6:07 | 6:53 |
| 9 | 12.7 | 6:08 | 6:51 |
| 10 | 12.7 | 6:10 | 6:49 |
| 11 | 12.6 | 6:11 | 6:47 |
| 12 | 12.5 | 6:12 | 6:45 |
| 13 | 12.5 | 6:13 | 6:43 |
| 14 | 12.4 | 6:15 | 6:40 |
| 15 | 12.4 | 6:16 | 6:38 |
| 16 | 12.3 | 6:17 | 6:36 |
| 17 | 12.3 | 6:19 | 6:34 |
| 18 | 12.2 | 6:20 | 6:32 |
| 19 | 12.2 | 6:21 | 6:30 |
| 20 | 12.1 | 6:22 | 6:28 |
| 21 | 12.0 | 6:24 | 6:26 |
| 22 | 12.0 | 6:25 | 6:24 |
| 23 | 11.9 | 6:26 | 6:22 |
| 24 | 11.9 | 6:28 | 6:20 |
| 25 | 11.8 | 6:29 | 6:18 |
| 26 | 11.8 | 6:30 | 6:16 |
| 27 | 11.7 | 6:32 | 6:14 |
| 28 | 11.7 | 6:33 | 6:12 |
| 29 | 11.6 | 6:34 | 6:10 |
| 30 | 11.5 | 6:36 | 6:08 |
Solar energy in September
Average shortwave solar energy reaching the ground each day in September, about 3.98 kWh/m².
For context, solar energy here swings from a low near 1.37 kWh/m² to a high of 5.84 kWh/m² in June across the year — September's 3.98 kWh/m² falls in the middle.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 4.5 | 4.5 | 4.5 | 4.4 | 4.4 | 4.3 | 4.3 | 4.3 | 4.2 | 4.2 | 4.1 | 4.1 | 4.1 | 4.0 | 4.0 | 4.0 | 3.9 | 3.9 | 3.8 | 3.8 | 3.8 | 3.7 | 3.7 | 3.6 | 3.6 | 3.6 | 3.5 | 3.5 | 3.4 | 3.4 |
| Level | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 4.5 | Bright |
| 2 | 4.5 | Bright |
| 3 | 4.5 | Bright |
| 4 | 4.4 | Bright |
| 5 | 4.4 | Bright |
| 6 | 4.3 | Bright |
| 7 | 4.3 | Bright |
| 8 | 4.3 | Bright |
| 9 | 4.2 | Bright |
| 10 | 4.2 | Bright |
| 11 | 4.1 | Bright |
| 12 | 4.1 | Bright |
| 13 | 4.1 | Bright |
| 14 | 4.0 | Bright |
| 15 | 4.0 | Moderate |
| 16 | 4.0 | Moderate |
| 17 | 3.9 | Moderate |
| 18 | 3.9 | Moderate |
| 19 | 3.8 | Moderate |
| 20 | 3.8 | Moderate |
| 21 | 3.8 | Moderate |
| 22 | 3.7 | Moderate |
| 23 | 3.7 | Moderate |
| 24 | 3.6 | Moderate |
| 25 | 3.6 | Moderate |
| 26 | 3.6 | Moderate |
| 27 | 3.5 | Moderate |
| 28 | 3.5 | Moderate |
| 29 | 3.4 | Moderate |
| 30 | 3.4 | Moderate |
Is September a good time to visit Chamonix?
Our two travel scores rate September for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
September is a weaker month for outdoor sightseeing in Chamonix.
What to pack for Chamonix in September
From September's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In September, Chamonix sees daytime highs around 14°C and nights near 4°C. Pack rain gear. Worth having: a warm layer. About 15 days see rain.
UV index in Chamonix in September
Clear-sky midday UV in September peaks around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Chamonix peaks around July 13 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near January 1 at about 1 (low).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 1 | 3 | 5 | 5 | 7 | 9 | 9 | 8 | 6 | 4 | 2 | 1 |
| Level | Low | Moderate | Moderate | High | Very high | Very high | Very high | Very high | High | Moderate | Low | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 1 | Low |
| Feb | 3 | Moderate |
| Mar | 5 | Moderate |
| Apr | 5 | High |
| May | 7 | Very high |
| Jun | 9 | Very high |
| Jul | 9 | Very high |
| Aug | 8 | Very high |
| Sep | 6 | High |
| Oct | 4 | Moderate |
| Nov | 2 | Low |
| Dec | 1 | Low |
Where is Chamonix?
Chamonix sits at 45.9°N, 6.9°E, 0 m above sea level, in France. The nearest listed city is Sallanches, 19 km away.
Topography around Chamonix
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Chamonix.
Within 3 km, the terrain around Chamonix has very significant variations in elevation — a maximum elevation change of 1,463 m around an average of 1,562 m above sea level; within 16 km, extreme variations in elevation — a maximum elevation change of 4,245 m; within 80 km, extreme variations in elevation — a maximum elevation change of 4,495 m.
The land around Chamonix is covered by trees (61%) and grassland (25%) within 3 km, trees (28%), grassland (26%) and snow and ice (24%) within 16 km, and trees (41%) and grassland (34%) within 80 km.
France travel facts
- Travel advisory
- Level 2
- Exercise Increased Caution
- Power plugs
- Type C / E
- 230 V · 50 Hz
- Prices
- ≈ 77% of US
- price level, 2025
- GDP per capita
- $48,986
- 2025
- Happiness
- 6.6 / 10
- World Happiness, 2025
- Safe drinking water
- 100%
- of population, 2024
- Homicide rate
- 1.3
- per 100k, 2023
- Road deaths
- 5.1
- per 100k/yr, 2019
- Income group
- High
- World Bank
- English
- Moderate
- EF EPI 539
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Chamonix (45.9237°, 6.8693°, elevation 0 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).