Saint-Barthélémy in Fall
In fall (September, October and November), Saint-Barthélémy sees average daytime highs around 19°C and overnight lows near 14°C, with 259 mm of rain over about 25 wet days across the season. It is the 2nd-warmest season and the wettest season of the year.
Over the season highs ease from about 24°C in early September to 13°C by late November. The sky is clear or mostly clear about 49% of the time across fall, and the air most often feels dry.
Fall is Saint-Barthélémy's 2nd-best season to visit on our travel score. For the whole year in context, see Saint-Barthélémy's year-round climate.
- Avg daytime high
- 19°C
- 2nd-warmest season
- Avg overnight low
- 14°C
- Rainfall
- 259 mm
- 25 wet days
- Avg wind
- 18 km/h
- Travel score
- 6.3
- 2nd-best season
- Months
- Sep · Oct · Nov
Temperature in Saint-Barthélémy in Fall
Over the season highs ease from about 24°C in early September to 13°C by late November.
A typical fall day in Saint-Barthélémy reaches about 19°C and drops to 14°C overnight. The warmest of the three months is September, the coolest November.
Saint-Barthélémy 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 | 11° / 7° | 63 | 7.7 | 0.2 | 9.2 | 3.0 |
| Feb | 11° / 6° | 47 | 6.5 | 0.5 | 10.2 | 3.2 |
| Mar | 14° / 8° | 42 | 5.8 | 0 | 11.6 | 4.6 |
| Apr | 16° / 11° | 61 | 7.5 | 0 | 13.2 | 5.4 |
| May | 19° / 14° | 45 | 5.8 | 0 | 14.5 | 7.0 |
| Jun | 23° / 18° | 24 | 3.6 | 0 | 15.1 | 8.3 |
| Jul | 26° / 20° | 10 | 1.8 | 0 | 14.9 | 8.8 |
| Aug | 26° / 20° | 14 | 2.3 | 0 | 13.8 | 8.5 |
| Sep | 23° / 18° | 65 | 6 | 0 | 12.3 | 7.8 |
| Oct | 19° / 14° | 88 | 8.5 | 0 | 10.8 | 6.5 |
| Nov | 15° / 10° | 106 | 10.4 | 0.1 | 9.5 | 4.5 |
| Dec | 12° / 8° | 70 | 8.5 | 0.1 | 8.8 | 3.3 |
Cloud cover in Fall
The sky is clear or mostly clear about 49% of the time across fall.
Chance of precipitation in Fall
Saint-Barthélémy gets around 259 mm of rain over 25 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 18 km/h across fall.
Sunrise & sunset in Fall
Daylight runs from about 13 hours in early September to 9 hours 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 3.4 kWh/m².
Hazard calendar for Saint-Barthélémy
In fall, Saint-Barthélémy overlaps its rainy season season. The full year is below, with each hazard's peak months called out.
Saint-Barthélémy's rainy season runs September–January, when most of the year's rain falls.
Is fall a good time to visit Saint-Barthélémy?
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-Barthélémy for sightseeing.
What to pack for Saint-Barthélémy in Fall
From fall's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In fall, Saint-Barthélémy sees daytime highs around 19°C and nights near 14°C. Worth packing: light clothes, a warm layer, rain gear and sun protection. About 25 days see rain.
Sea temperature near Saint-Barthélémy in Fall
The nearest coast averages about 19°C across fall — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea offshore is warmest in August at about 22°C and coldest in February near 13°C.
It's comfortable for a long swim from Jun 29 to Sep 30 — about 3.1 months when the water holds above 20°C.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 13 | 13 | 13 | 14 | 16 | 19 | 21 | 22 | 21 | 19 | 17 | 15 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Cool | Cool | Refreshing | Refreshing | Refreshing | Cool | Cool | Bracing |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 13 | Bracing |
| Feb | 13 | Bracing |
| Mar | 13 | Bracing |
| Apr | 14 | Bracing |
| May | 16 | Cool |
| Jun | 19 | Cool |
| Jul | 21 | Refreshing |
| Aug | 22 | Refreshing |
| Sep | 21 | Refreshing |
| Oct | 19 | Cool |
| Nov | 17 | Cool |
| Dec | 15 | Bracing |
UV index in Saint-Barthélémy in Fall
Clear-sky midday UV across fall averages around 3 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Saint-Barthélémy peaks around July 16 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 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 | 4 | 7 | 6 | 8 | 9 | 7 | 5 | 3 | 2 | 1 |
| Level | Low | Moderate | Moderate | High | High | Very high | Very high | Very high | High | Moderate | Low | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 1 | Low |
| Feb | 3 | Moderate |
| Mar | 4 | Moderate |
| Apr | 7 | High |
| May | 6 | High |
| Jun | 8 | Very high |
| Jul | 9 | Very high |
| Aug | 7 | Very high |
| Sep | 5 | High |
| Oct | 3 | Moderate |
| Nov | 2 | Low |
| Dec | 1 | Low |
Air quality in Saint-Barthélémy 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-Barthélémy is worst in March — around 17 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) | 13 | 15 | 17 | 17 | 15 | 16 | 14 | 15 | 13 | 13 | 11 | 12 |
| Level | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Good | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 13 | Moderate |
| Feb | 15 | Moderate |
| Mar | 17 | Moderate |
| Apr | 17 | Moderate |
| May | 15 | Moderate |
| Jun | 16 | Moderate |
| Jul | 14 | Moderate |
| Aug | 15 | Moderate |
| Sep | 13 | Moderate |
| Oct | 13 | Moderate |
| Nov | 11 | Good |
| Dec | 12 | Moderate |
Where is Saint-Barthélémy?
Saint-Barthélémy sits at 43.3°N, 5.4°E, 111 m above sea level, in France. The nearest listed city is Marseille 13, 1.0 km away.
Topography around Saint-Barthélémy
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Saint-Barthélémy.
Within 3 km, the terrain around Saint-Barthélémy has significant variations in elevation — a maximum elevation change of 256 m around an average of 97 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 773 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,261 m.
The land around Saint-Barthélémy is covered by artificial surfaces (69%) and trees (20%) within 3 km, trees (33%), water (23%) and artificial surfaces (21%) within 16 km, and trees (42%) and water (35%) 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-Barthélémy (43.331°, 5.4024°, elevation 111 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.