São Martinho in Fall
In fall (September, October and November), São Martinho sees average daytime highs around 21°C and overnight lows near 17°C, with 158 mm of rain over about 30 wet days across the season. It is the 2nd-warmest season and the 2nd-wettest season.
Over the season highs ease from about 24°C in early September to 17°C by late November. The sky is clear or mostly clear about 18% of the time across fall, and the air most often feels comfortable.
Fall is São Martinho's 2nd-best season to visit on our travel score. For the whole year in context, see São Martinho's year-round climate.
- Avg daytime high
- 21°C
- 2nd-warmest season
- Avg overnight low
- 17°C
- Rainfall
- 158 mm
- 30 wet days
- Avg wind
- 10 km/h
- Travel score
- 6.3
- 2nd-best season
- Months
- Sep · Oct · Nov
Temperature in São Martinho in Fall
Over the season highs ease from about 24°C in early September to 17°C by late November.
A typical fall day in São Martinho reaches about 21°C and drops to 17°C overnight. The warmest of the three months is September, the coolest November.
São Martinho 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 | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 16° / 13° | 51 | 8.4 | 10.1 | 4.9 |
| Feb | 15° / 12° | 53 | 7.9 | 10.8 | 4.8 |
| Mar | 16° / 13° | 56 | 10.3 | 11.8 | 5.0 |
| Apr | 17° / 13° | 47 | 8.6 | 12.8 | 5.4 |
| May | 19° / 14° | 28 | 7.4 | 13.7 | 6.4 |
| Jun | 21° / 16° | 13 | 3.5 | 14.1 | 7.5 |
| Jul | 23° / 18° | 4 | 1.4 | 13.9 | 8.6 |
| Aug | 24° / 19° | 7 | 2.5 | 13.2 | 8.6 |
| Sep | 23° / 19° | 25 | 7.7 | 12.2 | 7.2 |
| Oct | 21° / 18° | 69 | 11.7 | 11.2 | 6.1 |
| Nov | 18° / 15° | 64 | 11 | 10.3 | 5.6 |
| Dec | 17° / 14° | 83 | 10.4 | 9.9 | 5.1 |
Cloud cover in Fall
The sky is clear or mostly clear about 18% of the time across fall.
Chance of precipitation in Fall
São Martinho gets around 158 mm of rain over 30 wet days across fall. The line is the day-by-day chance of measurable precipitation.
Humidity in Fall
Most of fall feels comfortable — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Fall
Winds average 10 km/h across fall.
Sunrise & sunset in Fall
Daylight runs from about 12 h 42 min in early September to 10 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 4.1 kWh/m².
Hazard calendar for São Martinho
In fall, São Martinho overlaps its atlantic hurricane season. The full year is below, with each hazard's peak months called out.
São Martinho sits in the Atlantic hurricane belt; the season peaks August–October.
Is fall a good time to visit São Martinho?
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 São Martinho for sightseeing.
What to pack for São Martinho in Fall
From fall's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In fall, São Martinho sees daytime highs around 21°C and nights near 17°C. Worth packing: light clothes, rain gear and sun protection. About 30 days see rain.
Sea temperature near São Martinho in Fall
The nearest coast averages about 23°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 September at about 24°C and coldest in March near 18°C.
It's comfortable for a long swim from May 30 to Dec 14 — about 6.5 months when the water holds above 20°C.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 19 | 18 | 18 | 18 | 19 | 21 | 22 | 23 | 24 | 23 | 21 | 20 |
| Comfort | Cool | Cool | Cool | Cool | Cool | Refreshing | Refreshing | Refreshing | Refreshing | Refreshing | Refreshing | Cool |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 19 | Cool |
| Feb | 18 | Cool |
| Mar | 18 | Cool |
| Apr | 18 | Cool |
| May | 19 | Cool |
| Jun | 21 | Refreshing |
| Jul | 22 | Refreshing |
| Aug | 23 | Refreshing |
| Sep | 24 | Refreshing |
| Oct | 23 | Refreshing |
| Nov | 21 | Refreshing |
| Dec | 20 | Cool |
UV index in São Martinho in Fall
Clear-sky midday UV across fall averages 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 São Martinho peaks around July 15 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 16 at about 3 (moderate).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 11 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 4 | 5 | 9 | 8 | 9 | 10 | 11 | 10 | 8 | 7 | 3 | 3 |
| Level | Moderate | Moderate | Very high | Very high | Very high | Extreme | Extreme | Very high | Very high | High | Moderate | Moderate |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 4 | Moderate |
| Feb | 5 | Moderate |
| Mar | 9 | Very high |
| Apr | 8 | Very high |
| May | 9 | Very high |
| Jun | 10 | Extreme |
| Jul | 11 | Extreme |
| Aug | 10 | Very high |
| Sep | 8 | Very high |
| Oct | 7 | High |
| Nov | 3 | Moderate |
| Dec | 3 | Moderate |
Where is São Martinho?
São Martinho sits at 32.6°N, 16.9°W, 198 m above sea level, in Portugal. The nearest listed city is Santo António, 2.0 km away.
Topography around São Martinho
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of São Martinho.
Within 3 km, the terrain around São Martinho has significant variations in elevation — a maximum elevation change of 469 m around an average of 108 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,832 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,780 m.
The land around São Martinho is covered by water (40%), artificial surfaces (34%) and trees (21%) within 3 km, water (55%) and trees (32%) within 16 km, and water (93%) within 80 km.
Portugal travel facts
- Travel advisory
- Level 1
- Exercise Normal Precautions
- Power plugs
- Type C / E / F
- 230 V · 50 Hz
- Prices
- ≈ 60% of US
- price level, 2025
- GDP per capita
- $32,082
- 2025
- Happiness
- 6.0 / 10
- World Happiness, 2025
- Safe drinking water
- 95%
- of population, 2024
- Homicide rate
- 0.7
- per 100k, 2022
- Road deaths
- 8.2
- per 100k/yr, 2019
- Income group
- High
- World Bank
- English
- Very high
- EF EPI 612
- 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 São Martinho (32.6448°, -16.9384°, elevation 198 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.