Vila Franca de Xira weather in September

In September, Vila Franca de Xira sees average daytime highs of 26°C and overnight lows near 16°C, with 31 mm of rain across 4.6 wet days and about 12.3 hours of daylight. It is the 3rd-warmest and 9th-wettest month of the year here.

Highs ease over the month, from about 28°C in the first days to 25°C by the end. The sky is clear or mostly clear about 60% of the time in September, and the air most often feels comfortable.

Daylight stretches from about 12 h 54 min at the start of September to 11 h 36 min by month's end. Set against the rest of the year, September is Vila Franca de Xira's 4th-clearest and 9th-windiest month. For the whole year in context, see Vila Franca de Xira's year-round climate.

Daytime high
26°
3rd warmest
Overnight low
16°
10th coldest
Rainfall
31 mm
4.6 wet days
Daylight
12 h 12 min
6:23 AM – 6:38 PM
Cloud cover
35%
4th clearest
Wind
12 km/h
9th windiest
Solar energy
5.21 kWh/m²
Travel score
7.9
out of 10

Vila Franca de Xira is city seat of Vila Franca de Xira municipality.

Air quality
Good
PM10 22.4 µg/m³ · 2010

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 28°C in the first days to 25°C by the end.

A typical September day in Vila Franca de Xira reaches about 26°C in the afternoon and slips back to 16°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 22°C and 32°C. Set against its neighbours, September runs about 2°C cooler than August and about 4°C warmer than October.

10°15°20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
12817
22817
32817
42817
52817
62817
72717
82717
92716
102716
112716
122716
132716
142716
152616
162616
172616
182616
192616
202616
212616
222516
232516
242516
252515
262515
272515
282515
292515
302515

Vila Franca de Xira weather by month

How September compares with the rest of the year at a glance. September is the 3rd-warmest and 9th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan14° / 668.79.64.3
Feb15° / 50710.55.0
Mar18° / 578.411.76.2
Apr19° / 11°578.7136.5
May22° / 13°50714.17.4
Jun26° / 15°122.614.78.3
Jul28° / 17°30.814.58.0
Aug29° / 17°61.313.57.5
Sep26° / 16°314.612.37.9
Oct22° / 14°789.2116.9
Nov17° / 10°809.79.95.6
Dec15° / 769.39.34.5

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 60% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 15% of September, with mostly cloudy or overcast conditions the remaining 24%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
18515
28515
38416
48416
58218
68119
78119
88020
98020
107822
117822
127723
137723
147525
157525
167525
177426
187426
197327
207327
217228
227327
237228
247129
257129
267030
277030
286931
296931
306832

Chance of precipitation in September

Any precipitation

Vila Franca de Xira gets around 31 mm of rain over 4.6 wet days in September. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 15% and peaks near 21% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%151015202530
Rain chance (%)
16
26
37
47
57
68
78
89
910
1011
1112
1213
1314
1415
1515
1616
1717
1818
1919
2019
2120
2221
2321
2421
2521
2621
2721
2821
2920
3020

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

Most of September feels comfortable — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, September lands in the comfortable band about 42% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
12246302
22346302
32345302
42445292
52544292
62544292
72644292
82643282
92743282
102743282
112743282
122743282
132842282
142842272
152942272
162942272
173042262
183042262
193142262
203142252
213141252
223241252
233241252
243341252
253341242
263440242
273440242
283539232
293639232
303738222

Wind in September

Winds average 12 km/h in September.

Across September, daily wind ranges from about 12 km/h on the calmest days to 13 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202530
Wind speed (km/h)Feels
113light breeze
213light breeze
313light breeze
413light breeze
513light breeze
613light breeze
713light breeze
813light breeze
913light breeze
1013light breeze
1113light breeze
1213light breeze
1313light breeze
1413light breeze
1513light breeze
1613light breeze
1713light breeze
1812light breeze
1912light breeze
2012light breeze
2112light breeze
2212light breeze
2312light breeze
2412light breeze
2512light breeze
2612light breeze
2712light breeze
2812light breeze
2912light breeze
3012light breeze

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 54 min at the start of September to 11 h 36 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 78 minutes over September. Sunrise moves from 6:09 AM to 6:36 AM, and sunset from 7:02 PM to 6:15 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.96:097:02
212.86:107:01
312.86:116:59
412.86:126:58
512.76:136:56
612.76:146:54
712.66:146:53
812.66:156:51
912.66:166:49
1012.56:176:48
1112.56:186:46
1212.46:196:44
1312.46:206:43
1412.36:216:41
1512.36:226:39
1612.26:236:38
1712.26:246:36
1812.26:256:34
1912.16:266:33
2012.16:276:31
2112.06:276:29
2212.06:286:28
2311.96:296:26
2411.96:306:24
2511.96:316:23
2611.86:326:21
2711.86:336:19
2811.76:346:18
2911.76:356:16
3011.66:366:15

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.21 kWh/m².

For context, solar energy here swings from a low near 1.96 kWh/m² to a high of 7.58 kWh/m² in July across the year — September's 5.21 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
16.1Intense
26.0Intense
36.0Bright
45.9Bright
55.8Bright
65.8Bright
75.7Bright
85.7Bright
95.6Bright
105.5Bright
115.5Bright
125.4Bright
135.3Bright
145.3Bright
155.2Bright
165.2Bright
175.1Bright
185.0Bright
195.0Bright
204.9Bright
214.9Bright
224.8Bright
234.8Bright
244.7Bright
254.7Bright
264.6Bright
274.6Bright
284.5Bright
294.5Bright
304.4Bright
Planning a trip in September

Is September a good time to visit Vila Franca de Xira?

Our two travel scores rate September for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

7.9
Sightseeing
3rd-best month of the year
7.7
Beach & pool
4th-best month of the year

September is one of the better times to visit Vila Franca de Xira for general sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Vila Franca de Xira in September

From September's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In September, Vila Franca de Xira sees daytime highs around 26°C and nights near 16°C. Worth packing: light clothes and sun protection. About 5 days see rain.

light clothessun protection

Sea temperature near Vila Franca de Xira in September

The nearest coast averages about 18°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 38 km away) is warmest in August at about 18°C and coldest in February near 14°C.

The water stays below 20°C all year — cool enough that most swimmers want a wetsuit.

12°14°16°18°20°JanFebMarAprMayJunJulAugSepOctNovDecbracingcool
Sea temperature (°C)Comfort
Jan15Bracing
Feb14Bracing
Mar14Bracing
Apr15Bracing
May16Cool
Jun17Cool
Jul18Cool
Aug18Cool
Sep18Cool
Oct18Cool
Nov17Cool
Dec15Cool

UV index in Vila Franca de Xira in September

LowModerateHighVery highExtreme

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 Vila Franca de Xira peaks around July 16 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 at about 2 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateLowJul 16UV 9Dec 20UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar6High
Apr8Very high
May7Very high
Jun9Very high
Jul9Very high
Aug9Very high
Sep6High
Oct5High
Nov3Moderate
Dec2Low
Location & terrain

Where is Vila Franca de Xira?

Vila Franca de Xira sits at 39.0°N, 9.0°W, 15 m above sea level, in Portugal. The nearest listed city is Vialonga, 12 km away.

Topography around Vila Franca de Xira

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Vila Franca de Xira.

Within 3 km, the terrain around Vila Franca de Xira has only modest variations in elevation — a maximum elevation change of 213 m around an average of 61 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 439 m; within 80 km, large variations in elevation — a maximum elevation change of 674 m.

The land around Vila Franca de Xira is covered by grassland (29%) and cropland (28%) within 3 km, grassland (36%) and cropland (29%) within 16 km, and water (33%), grassland (32%) and trees (23%) within 80 km.

3 km
213 m
16 km
439 m
80 km
674 m
treesshrubsgrasslandcroplandartificial surfacesbare terrainwaterwetland
September weather nearby: Vialonga 12 km · Póvoa de Santa Iria 12 km · Santa Iria da Azóia 16 km · Azambuja 17 km · São João da Talha 17 km · Camarate 21 km · Loures 21 km · Sacavém 21 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
Catholic 68%not applicable 13%no religion 12%no response 2%

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 Vila Franca de Xira (38.9552°, -8.9897°, 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. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. 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).