Saint-Cyr-l'École in Fall
In fall (September, October and November), Saint-Cyr-l'École sees average daytime highs around 15°C and overnight lows near 8°C, with 170 mm of precipitation over about 31 wet days across the season. It is the 2nd-warmest season and the 2nd-wettest season.
Over the season highs ease from about 22°C in early September to 8°C by late November. The sky is clear or mostly clear about 17% of the time across fall, and the air most often feels dry.
Fall is Saint-Cyr-l'École's 2nd-best season to visit on our travel score. For the whole year in context, see Saint-Cyr-l'École's year-round climate.
- Avg daytime high
- 15°C
- 2nd-warmest season
- Avg overnight low
- 8°C
- Precipitation
- 170 mm
- 31 wet days
- Avg wind
- 13 km/h
- Travel score
- 4.4
- 2nd-best season
- Months
- Sep · Oct · Nov
Temperature in Saint-Cyr-l'École in Fall
Over the season highs ease from about 22°C in early September to 8°C by late November.
A typical fall day in Saint-Cyr-l'École reaches about 15°C and drops to 8°C overnight. The warmest of the three months is September, the coolest November.
How fall really feels in Saint-Cyr-l'École
Once humidity and wind are folded in, fall brings about 0 days that feel above 32°C and 2 that feel at or below 0°C.
The story in fall is cold — wind chill drags the overnight "feels like" below the raw low.
Saint-Cyr-l'École weather by month
How the three fall months (September, October and November) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | 7° / 2° | 53 | 11.3 | 1 | 8.5 | 0.7 |
| Feb | 8° / 2° | 47 | 10 | 1.3 | 9.8 | 1.2 |
| Mar | 12° / 4° | 51 | 10.6 | 0.6 | 11.6 | 2.9 |
| Apr | 15° / 6° | 52 | 11 | 0 | 13.4 | 4.3 |
| May | 18° / 9° | 67 | 11.6 | 0 | 15 | 5.5 |
| Jun | 22° / 12° | 60 | 10.4 | 0 | 15.9 | 6.4 |
| Jul | 24° / 14° | 55 | 9.1 | 0 | 15.5 | 7.0 |
| Aug | 24° / 14° | 58 | 8.9 | 0 | 14.2 | 7.0 |
| Sep | 20° / 11° | 48 | 8.5 | 0 | 12.4 | 6.4 |
| Oct | 16° / 8° | 63 | 11.2 | 0 | 10.5 | 4.6 |
| Nov | 10° / 5° | 59 | 11.1 | 0.3 | 8.9 | 2.2 |
| Dec | 7° / 3° | 68 | 12.4 | 1.1 | 8.1 | 0.9 |
Cloud cover in Fall
The sky is clear or mostly clear about 17% of the time across fall.
Chance of precipitation in Fall
Saint-Cyr-l'École gets around 170 mm of rain and snow over 31 wet days across fall. The line is the day-by-day chance of measurable precipitation.
Humidity in Fall
Most of fall feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Fall
Winds average 13 km/h across fall.
Sunrise & sunset in Fall
Daylight runs from about 13 h 18 min in early September to 8 h 24 min by late November. The lit band spans sunrise to sunset each day.
Solar energy in Fall
Average shortwave solar energy reaching the ground each day across fall, about 2.2 kWh/m².
Is fall a good time to visit Saint-Cyr-l'École?
Our two travel scores rate fall for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
fall is a reasonable time to visit Saint-Cyr-l'École for sightseeing.
What to pack for Saint-Cyr-l'École in Fall
From fall's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In fall, Saint-Cyr-l'École sees daytime highs around 15°C and nights near 8°C. Pack a warm layer. Worth having: rain gear. About 31 days see rain.
UV index in Saint-Cyr-l'École in Fall
Clear-sky midday UV across fall averages around 3. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Saint-Cyr-l'École peaks around June 22 at about 7 (high) — sunscreen and a hat are worth it in the middle of the day. 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 7 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 1 | 2 | 3 | 5 | 6 | 7 | 7 | 7 | 4 | 3 | 1 | 1 |
| Level | Low | Low | Moderate | Moderate | High | High | High | High | Moderate | Moderate | Low | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 1 | Low |
| Feb | 2 | Low |
| Mar | 3 | Moderate |
| Apr | 5 | Moderate |
| May | 6 | High |
| Jun | 7 | High |
| Jul | 7 | High |
| Aug | 7 | High |
| Sep | 4 | Moderate |
| Oct | 3 | Moderate |
| Nov | 1 | Low |
| Dec | 1 | Low |
Air quality in Saint-Cyr-l'École in Fall
Average fine-particle pollution (PM2.5) through the year — so you can see where fall falls, not just the annual average.
Air quality in Saint-Cyr-l'École is worst in April — around 20 µg/m³ PM2.5 (moderate), and holds fairly steady the rest of the year.
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 17 | 17 | 20 | 20 | 17 | 16 | 13 | 14 | 15 | 15 | 15 | 15 |
| Level | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 17 | Moderate |
| Feb | 17 | Moderate |
| Mar | 20 | Moderate |
| Apr | 20 | Moderate |
| May | 17 | Moderate |
| Jun | 16 | Moderate |
| Jul | 13 | Moderate |
| Aug | 14 | Moderate |
| Sep | 15 | Moderate |
| Oct | 15 | Moderate |
| Nov | 15 | Moderate |
| Dec | 15 | Moderate |
Where is Saint-Cyr-l'École?
Saint-Cyr-l'École sits at 48.8°N, 2.1°E, 153 m above sea level, in France. The nearest listed city is Guyancourt, 3.0 km away.
Topography around Saint-Cyr-l'École
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Saint-Cyr-l'École.
Within 3 km, the terrain around Saint-Cyr-l'École has only modest variations in elevation — a maximum elevation change of 98 m around an average of 145 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 221 m; within 80 km, significant variations in elevation — a maximum elevation change of 297 m.
The land around Saint-Cyr-l'École is covered by trees (45%) and artificial surfaces (30%) within 3 km, trees (47%), artificial surfaces (22%) and cropland (21%) within 16 km, and cropland (55%) and trees (30%) 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 Saint-Cyr-l'École (48.7987°, 2.0681°, elevation 153 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.