Paço de Arcos in Fall
In fall (September, October and November), Paço de Arcos sees average daytime highs around 20°C and overnight lows near 15°C, with 188 mm of rain over about 23 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 15°C by late November. The sky is clear or mostly clear about 47% of the time across fall, and the air most often feels dry.
Fall is Paço de Arcos's 2nd-best season to visit on our travel score. For the whole year in context, see Paço de Arcos's year-round climate.
- Avg daytime high
- 20°C
- 2nd-warmest season
- Avg overnight low
- 15°C
- Rainfall
- 188 mm
- 23 wet days
- Avg wind
- 16 km/h
- Travel score
- 6.8
- 2nd-best season
- Months
- Sep · Oct · Nov
Temperature in Paço de Arcos in Fall
Over the season highs ease from about 24°C in early September to 15°C by late November.
A typical fall day in Paço de Arcos reaches about 20°C and drops to 15°C overnight. The warmest of the three months is September, the coolest November.
Paço de Arcos 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 | 14° / 10° | 68 | 8.9 | 9.6 | 4.2 |
| Feb | 15° / 10° | 51 | 7.5 | 10.5 | 4.6 |
| Mar | 16° / 11° | 53 | 8.1 | 11.7 | 5.5 |
| Apr | 17° / 12° | 51 | 8.4 | 13 | 6.0 |
| May | 19° / 14° | 42 | 5.9 | 14.1 | 7.1 |
| Jun | 22° / 16° | 10 | 2.1 | 14.7 | 8.4 |
| Jul | 24° / 18° | 2 | 0.6 | 14.4 | 9.3 |
| Aug | 24° / 18° | 4 | 1 | 13.5 | 9.2 |
| Sep | 23° / 17° | 29 | 4.1 | 12.3 | 8.3 |
| Oct | 20° / 16° | 77 | 8.9 | 11 | 6.7 |
| Nov | 17° / 13° | 82 | 10.2 | 9.9 | 5.5 |
| Dec | 15° / 11° | 79 | 9.4 | 9.3 | 4.5 |
Cloud cover in Fall
The sky is clear or mostly clear about 47% of the time across fall.
Chance of precipitation in Fall
Paço de Arcos gets around 188 mm of rain over 23 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 16 km/h across fall.
Sunrise & sunset in Fall
Daylight runs from about 12 h 54 min in early September to 9 h 30 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 3.8 kWh/m².
Is fall a good time to visit Paço de Arcos?
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 Paço de Arcos for sightseeing.
What to pack for Paço de Arcos in Fall
From fall's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In fall, Paço de Arcos sees daytime highs around 20°C and nights near 15°C. Worth packing: light clothes, a warm layer, rain gear and sun protection. About 23 days see rain.
Sea temperature near Paço de Arcos in Fall
The nearest coast averages about 18°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 19°C and coldest in February near 15°C.
The water stays below 20°C all year — cool enough that most swimmers want a wetsuit.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 15 | 15 | 15 | 15 | 16 | 18 | 18 | 19 | 19 | 18 | 17 | 16 |
| Comfort | Cool | Bracing | Bracing | Cool | Cool | Cool | Cool | Cool | Cool | Cool | Cool | Cool |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 15 | Cool |
| Feb | 15 | Bracing |
| Mar | 15 | Bracing |
| Apr | 15 | Cool |
| May | 16 | Cool |
| Jun | 18 | Cool |
| Jul | 18 | Cool |
| Aug | 19 | Cool |
| Sep | 19 | Cool |
| Oct | 18 | Cool |
| Nov | 17 | Cool |
| Dec | 16 | Cool |
UV index in Paço de Arcos in Fall
Clear-sky midday UV across fall averages around 5 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Paço de Arcos peaks around July 15 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 21 at about 2 (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) | 2 | 3 | 6 | 8 | 7 | 9 | 9 | 9 | 6 | 5 | 3 | 2 |
| Level | Low | Moderate | High | Very high | Very high | Very high | Very high | Very high | High | High | Moderate | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 2 | Low |
| Feb | 3 | Moderate |
| Mar | 6 | High |
| Apr | 8 | Very high |
| May | 7 | Very high |
| Jun | 9 | Very high |
| Jul | 9 | Very high |
| Aug | 9 | Very high |
| Sep | 6 | High |
| Oct | 5 | High |
| Nov | 3 | Moderate |
| Dec | 2 | Low |
Where is Paço de Arcos?
Paço de Arcos sits at 38.7°N, 9.3°W, 15 m above sea level, in Portugal. The nearest listed city is Oeiras, 2.0 km away.
Topography around Paço de Arcos
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Paço de Arcos.
Within 3 km, the terrain around Paço de Arcos has only modest variations in elevation — a maximum elevation change of 132 m around an average of 31 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 514 m; within 80 km, large variations in elevation — a maximum elevation change of 656 m.
The land around Paço de Arcos is covered by water (41%) and artificial surfaces (27%) within 3 km, water (40%) and artificial surfaces (25%) within 16 km, and water (45%) and grassland (27%) 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 Paço de Arcos (38.6957°, -9.2914°, elevation 15 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.