Alcobaça weather in September

In September, Alcobaça sees average daytime highs of 24°C and overnight lows near 16°C, with 38 mm of rain across 5.4 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 25°C in the first days to 23°C by the end. The sky is clear or mostly clear about 57% 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 Alcobaça's 3rd-clearest and 12th-windiest month. For the whole year in context, see Alcobaça's year-round climate.

Daytime high
24°
3rd warmest
Overnight low
16°
10th coldest
Rainfall
38 mm
5.4 wet days
Daylight
12 h 18 min
6:23 AM – 6:38 PM
Cloud cover
38%
3rd clearest
Wind
14 km/h
12th windiest
Solar energy
5.16 kWh/m²
Travel score
8.0
out of 10

Alcobaça is city seat of Alcobaça municipality.

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 25°C in the first days to 23°C by the end.

A typical September day in Alcobaça reaches about 24°C in the afternoon and slips back to 16°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 20°C and 29°C. Set against its neighbours, September runs about 2°C cooler than August and about 3°C warmer than October.

10°15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
12517
22517
32517
42517
52517
62517
72517
82517
92517
102516
112416
122416
132416
142416
152416
162416
172416
182416
192416
202316
212316
222316
232316
242316
252316
262316
272316
282316
292316
302315

Alcobaça 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° / 7910.39.53.9
Feb15° / 588.310.44.5
Mar17° / 10°629.311.75.6
Apr18° / 11°6510.4135.9
May20° / 13°57814.16.8
Jun23° / 15°174.114.78.2
Jul25° / 16°72.314.58.8
Aug25° / 17°9213.68.7
Sep24° / 16°385.412.38.0
Oct21° / 14°889.910.96.6
Nov17° / 11°9011.49.85.2
Dec14° / 8210.19.34.2

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 57% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 17% of September, with mostly cloudy or overcast conditions the remaining 27%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
18218
28218
38119
48119
57921
67921
77822
87723
97723
107525
117525
127426
137426
147426
157327
167327
177228
187228
197129
207129
217030
227030
236931
246931
256832
266832
276832
286634
296634
306535

Chance of precipitation in September

Any precipitation

Alcobaça gets around 38 mm of rain over 5.4 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 18% and peaks near 23% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%151015202530
Rain chance (%)
19
210
310
410
511
611
712
813
913
1014
1115
1216
1317
1418
1519
1620
1720
1821
1921
2022
2122
2223
2323
2423
2523
2623
2723
2822
2922
3022

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 44% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
11143433
21143433
31143433
41243433
51242423
61342423
71342423
81342423
91442423
101442413
111542413
121542412
131642402
141642392
151742382
161843372
171843372
181943362
192044352
202044342
212044342
222145332
232145322
242145322
252146312
262246302
272246292
282346282
292446282
302546272

Wind in September

Winds average 14 km/h in September, the calmest month.

Across September, daily wind ranges from about 14 km/h on the calmest days to 14 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202530
Wind speed (km/h)Feels
114light breeze
214light breeze
314light breeze
414light breeze
514light breeze
614light breeze
714light breeze
814light breeze
914light breeze
1014light breeze
1114light breeze
1214light breeze
1314light breeze
1414light breeze
1514light breeze
1614light breeze
1714light breeze
1814light breeze
1914light breeze
2014light breeze
2114light breeze
2214light breeze
2314light breeze
2414light breeze
2514light breeze
2614light breeze
2714light breeze
2814light breeze
2914light breeze
3014light 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 6:08 AM to 6:36 AM, and sunset from 7:03 PM to 6:14 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.96:087:03
212.96:097:01
312.86:107:00
412.86:116:58
512.76:126:56
612.76:136:55
712.76:146:53
812.66:156:51
912.66:166:50
1012.56:176:48
1112.56:186:46
1212.46:196:45
1312.46:206:43
1412.36:216:41
1512.36:226:40
1612.36:236:38
1712.26:246:36
1812.26:246:34
1912.16:256:33
2012.16:266:31
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
3011.66:366:14

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.16 kWh/m².

For context, solar energy here swings from a low near 1.94 kWh/m² to a high of 7.45 kWh/m² in July across the year — September's 5.16 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
16.0Bright
25.9Bright
35.9Bright
45.8Bright
55.8Bright
65.7Bright
75.7Bright
85.6Bright
95.5Bright
105.5Bright
115.4Bright
125.3Bright
135.3Bright
145.2Bright
155.2Bright
165.1Bright
175.0Bright
185.0Bright
194.9Bright
204.9Bright
214.8Bright
224.8Bright
234.7Bright
244.7Bright
254.6Bright
264.6Bright
274.5Bright
284.5Bright
294.4Bright
304.4Bright
Planning a trip in September

Is September a good time to visit Alcobaça?

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

8.0
Sightseeing
4th-best month of the year
6.7
Beach & pool
3rd-best month of the year

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

What to pack for Alcobaça in September

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

In September, Alcobaça sees daytime highs around 24°C and nights near 16°C. Worth packing: light clothes and sun protection. About 5 days see rain.

light clothessun protection

Sea temperature near Alcobaça in September

The nearest coast averages about 19°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 15 km away) is warmest in August at about 19°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°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshing
Sea temperature (°C)Comfort
Jan15Bracing
Feb14Bracing
Mar14Bracing
Apr15Cool
May16Cool
Jun18Cool
Jul18Cool
Aug19Cool
Sep19Cool
Oct18Cool
Nov17Cool
Dec15Cool

UV index in Alcobaça 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 Alcobaça peaks around July 14 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 14UV 9Dec 20UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar6High
Apr7Very high
May7High
Jun9Very high
Jul9Very high
Aug8Very high
Sep6High
Oct5Moderate
Nov2Moderate
Dec2Low
Location & terrain

Where is Alcobaça?

Alcobaça sits at 39.6°N, 9.0°W, 38 m above sea level, in Portugal. The nearest listed city is Caldas da Rainha, 22 km away.

Topography around Alcobaça

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Alcobaça.

Within 3 km, the terrain around Alcobaça has only modest variations in elevation — a maximum elevation change of 177 m around an average of 87 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 611 m; within 80 km, large variations in elevation — a maximum elevation change of 865 m.

The land around Alcobaça is covered by trees (53%) and grassland (32%) within 3 km, trees (49%) and grassland (29%) within 16 km, and trees (38%), water (27%) and grassland (24%) within 80 km.

3 km
177 m
16 km
611 m
80 km
865 m
treesshrubsgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Caldas da Rainha 22 km · Marinha Grande 22 km · Monsanto 25 km · Leiria 26 km · Torres Novas 38 km · Peniche 41 km · Santarém 43 km · Entroncamento 45 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 Alcobaça (39.5522°, -8.9775°, elevation 38 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).