Sesimbra weather in December

In December, Sesimbra sees average daytime highs of 15°C and overnight lows near 11°C, with 77 mm of rain across 9.1 wet days and about 9.4 hours of daylight. It is the 10th-warmest and 1st-wettest month of the year here.

Day-to-day highs hold fairly steady near 15°C through the month. The sky is clear or mostly clear about 36% of the time in December, and the air most often feels dry.

Daylight stretches from about 9 h 30 min at the start of December to 9 h 24 min by month's end. Set against the rest of the year, December is Sesimbra's 12th-clearest and 2nd-windiest month. For the whole year in context, see Sesimbra's year-round climate.

Daytime high
15°
10th warmest
Overnight low
11°
3rd coldest
Rainfall
77 mm
9.1 wet days
Daylight
9 h 18 min
7:53 AM – 5:13 PM
Cloud cover
55%
12th clearest
Wind
18 km/h
2nd windiest
Solar energy
2.08 kWh/m²
Travel score
4.8
out of 10

Sesimbra is human settlement in Portugal.

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

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 15°C through the month.

A typical December day in Sesimbra reaches about 15°C in the afternoon and slips back to 11°C overnight — a 4°C spread between the day's warmth and the night's chill. On most days the high lands between 13°C and 17°C. Set against its neighbours, December runs about 2°C cooler than November and about 1°C warmer than January.

10°15°20°151015202531
Avg high (°C)Avg low (°C)
11612
21612
31612
41612
51612
61612
71611
81511
91511
101511
111511
121511
131511
141511
151511
161511
171511
181511
191511
201511
211511
221511
231511
241511
251511
261511
271511
281511
291511
301511
311511

Sesimbra weather by month

How December compares with the rest of the year at a glance. December is the 10th-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan14° / 10°638.49.64.6
Feb15° / 10°486.610.54.9
Mar17° / 12°48711.75.9
Apr18° / 13°457.4136.3
May20° / 15°355.114.17.3
Jun23° / 17°81.514.68.7
Jul25° / 18°10.414.49.4
Aug25° / 18°30.613.59.2
Sep23° / 18°253.612.38.5
Oct21° / 16°708.1116.9
Nov17° / 13°748.89.95.9
Dec15° / 11°779.19.44.8

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 36% of the time in December, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 13% of December, with mostly cloudy or overcast conditions the remaining 51%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15050
25050
34951
44951
54951
64951
74852
84753
94753
104753
114654
124654
134753
144753
154753
164753
174753
184753
194852
204852
214852
225050
235050
244951
254951
265050
275050
285050
295050
305149
315149

Chance of precipitation in December

Any precipitation

Sesimbra gets around 77 mm of rain over 9.1 wet days in December, the wettest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 30% and peaks near 30% on the wettest days.

0%10%20%30%40%151015202531
Rain chance (%)
130
230
330
429
529
629
729
829
929
1030
1130
1230
1330
1430
1530
1630
1730
1830
1930
2030
2130
2230
2330
2430
2530
2630
2729
2829
2929
3029
3129

Humidity in December

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, December lands in the dry band about 85% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)
183161
284151
384151
484151
584151
684151
784160
884160
984160
1084160
1184160
1284160
1385150
1485150
1585150
1686140
1786140
1886140
1987130
2087130
2186131
2286131
2386131
2486131
2586131
2686131
2786131
2886131
2986131
3086131
3187130

Wind in December

Winds average 18 km/h in December.

Across December, daily wind ranges from about 17 km/h on the calmest days to 18 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202531
Wind speed (km/h)Feels
117light breeze
217light breeze
317light breeze
417light breeze
517light breeze
617light breeze
717light breeze
817light breeze
917light breeze
1017light breeze
1117light breeze
1217light breeze
1317light breeze
1418light breeze
1518light breeze
1618light breeze
1718light breeze
1818light breeze
1918light breeze
2018light breeze
2118light breeze
2218light breeze
2318light breeze
2418light breeze
2518light breeze
2618light breeze
2718light breeze
2818light breeze
2918light breeze
3018light breeze
3118light breeze

Sunrise & sunset in December

DaylightNight

Daylight runs from about 9 h 30 min at the start of December to 9 h 24 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 6 minutes over December. Sunrise moves from 7:41 AM to 7:59 AM, and sunset from 5:12 PM to 5:20 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
19.57:415:12
29.57:425:11
39.57:435:11
49.57:435:11
59.47:445:11
69.47:455:11
79.47:465:11
89.47:475:11
99.47:485:11
109.47:485:11
119.47:495:11
129.47:505:12
139.47:515:12
149.37:515:12
159.37:525:12
169.37:535:13
179.37:535:13
189.37:545:13
199.37:545:14
209.37:555:14
219.37:555:14
229.37:565:15
239.37:565:15
249.37:575:16
259.37:575:16
269.37:585:17
279.37:585:18
289.37:585:18
299.37:585:19
309.37:595:19
319.47:595:20

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 2.08 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 2.08 kWh/m² to a high of 7.69 kWh/m² in July across the year — December's 2.08 kWh/m² sits near the bottom.

0123151015202531
Solar energy (kWh/m²)Level
12.2Moderate
22.2Moderate
32.2Moderate
42.2Moderate
52.1Moderate
62.1Moderate
72.1Moderate
82.1Moderate
92.1Moderate
102.1Moderate
112.1Moderate
122.1Moderate
132.1Moderate
142.1Moderate
152.1Moderate
162.1Moderate
172.1Moderate
182.1Moderate
192.1Moderate
202.1Moderate
212.1Moderate
222.1Moderate
232.1Moderate
242.1Moderate
252.1Moderate
262.1Moderate
272.1Moderate
282.1Moderate
292.1Moderate
302.1Moderate
312.1Moderate
Planning a trip in December

Is December a good time to visit Sesimbra?

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

4.8
Sightseeing
11th-best month of the year
0.2
Beach & pool
10th-best month of the year

December is a reasonable time to visit Sesimbra for sightseeing.

What to pack for Sesimbra in December

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

In December, Sesimbra sees daytime highs around 15°C and nights near 11°C. Worth packing: a warm layer and rain gear. About 9 days see rain.

a warm layerrain gear

Sea temperature near Sesimbra in December

The nearest coast averages about 16°C in December — 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.

14°16°18°20°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshing
Sea temperature (°C)Comfort
Jan15Cool
Feb15Bracing
Mar15Bracing
Apr16Cool
May17Cool
Jun18Cool
Jul19Cool
Aug19Cool
Sep19Cool
Oct18Cool
Nov17Cool
Dec16Cool

UV index in Sesimbra in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 2. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Sesimbra peaks around July 15 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 9 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateJul 15UV 9Dec 20UV 2
UV index (midday)Level
Jan2Moderate
Feb3Moderate
Mar6High
Apr8Very high
May7Very high
Jun9Very high
Jul9Very high
Aug8Very high
Sep6High
Oct5High
Nov3Moderate
Dec2Low
Location & terrain

Where is Sesimbra?

Sesimbra sits at 38.4°N, 9.1°W, 26 m above sea level, in Portugal. The nearest listed city is Azeitão, 11 km away.

Topography around Sesimbra

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

Within 3 km, the terrain around Sesimbra has significant variations in elevation — a maximum elevation change of 319 m around an average of 107 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 492 m; within 80 km, significant variations in elevation — a maximum elevation change of 594 m.

The land around Sesimbra is covered by water (34%), grassland (24%) and trees (21%) within 3 km, water (62%) within 16 km, and water (41%) and grassland (32%) within 80 km.

3 km
319 m
16 km
492 m
80 km
594 m
treesshrubsgrasslandcroplandartificial surfacesbare terrainwater
December weather nearby: Azeitão 11 km · Quinta Do Conde 14 km · Arrentela 20 km · Setúbal 21 km · Amora 21 km · Charneca de Caparica 21 km · Corroios 22 km · Palmela 22 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 Sesimbra (38.4445°, -9.1015°, elevation 26 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).