Marinha Grande weather in September

In September, Marinha Grande sees average daytime highs of 21°C and overnight lows near 16°C, with 39 mm of rain across 5.3 wet days and about 12.3 hours of daylight. It is the 3rd-warmest and 9th-wettest month of the year here.

Day-to-day highs hold fairly steady near 21°C through the month. The sky is clear or mostly clear about 58% of the time in September, and the air most often feels humid.

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 Marinha Grande's 3rd-clearest and 12th-windiest month. For the whole year in context, see Marinha Grande's year-round climate.

Daytime high
21°
3rd warmest
Overnight low
16°
10th coldest
Rainfall
39 mm
5.3 wet days
Daylight
12 h 18 min
6:22 AM – 6:38 PM
Cloud cover
38%
3rd clearest
Wind
15 km/h
12th windiest
Solar energy
5.15 kWh/m²
Travel score
7.6
out of 10

Marinha Grande is capital city of the Marinha Grande municipality, Portugal.

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

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 21°C through the month.

A typical September day in Marinha Grande reaches about 21°C in the afternoon and slips back to 16°C overnight — a 5°C spread between the day's warmth and the night's chill. On most days the high lands between 19°C and 24°C. Set against its neighbours, September runs about 1°C cooler than August and about 2°C warmer than October.

10°15°20°25°151015202530
Avg high (°C)Avg low (°C)
12217
22217
32217
42217
52217
62217
72217
82217
92217
102217
112217
122217
132117
142117
152116
162116
172116
182116
192116
202116
212116
222116
232116
242116
252116
262116
272116
282116
292116
302016

Marinha Grande 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° / 9911.39.53.8
Feb14° / 10°729.110.44.2
Mar16° / 11°709.411.75.0
Apr16° / 12°7410135.3
May18° / 14°598.114.26.4
Jun20° / 16°163.614.87.7
Jul22° / 17°61.614.58.5
Aug22° / 17°91.913.68.6
Sep21° / 16°395.312.37.6
Oct19° / 15°10310.510.96.2
Nov16° / 12°11012.39.84.9
Dec14° / 10°101119.24.2

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 58% 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 25%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
18317
28317
38317
48218
58218
68020
78020
87921
97822
107822
117723
127723
137624
147624
157525
167525
177426
187426
197327
207327
217228
227129
237129
247030
256931
266832
276832
286634
296634
306634

Chance of precipitation in September

Any precipitation

Marinha Grande gets around 39 mm of rain over 5.3 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 17% 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
29
310
410
510
611
712
812
913
1014
1115
1216
1317
1417
1518
1619
1720
1820
1921
2022
2122
2223
2323
2423
2523
2623
2723
2823
2923
3023

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the humid 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 (%)
1733573
2734563
3834553
4834553
5835543
6935533
7936523
8936523
91037503
101038493
111138483
121139473
131239463
141240452
151341442
161342432
171442422
181543412
191544401
201644391
211645381
221745381
231745371
241845361
251846351
261946341
272046331
282046321
292146311
302346301

Wind in September

Winds average 15 km/h in September, the calmest month.

Across September, daily wind ranges from about 15 km/h on the calmest days to 16 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202530
Wind speed (km/h)Feels
116light breeze
216light breeze
316light breeze
415light breeze
515light breeze
615light breeze
715light breeze
815light breeze
915light breeze
1015light breeze
1115light breeze
1215light breeze
1315light breeze
1416light breeze
1516light breeze
1616light breeze
1716light breeze
1816light breeze
1916light breeze
2016light breeze
2116light breeze
2216light breeze
2316light breeze
2416light breeze
2516light breeze
2616light breeze
2716light breeze
2816light breeze
2916light breeze
3016light 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
1212.46:186:45
1312.46:196:43
1412.36:206:41
1512.36:216:39
1612.36:226:38
1712.26:236:36
1812.26:246:34
1912.16:256:33
2012.16:266:31
2112.06:276:29
2212.06:286:27
2311.96:296:26
2411.96:306:24
2511.96:316:22
2611.86:326:21
2711.86:336:19
2811.76:346:17
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 5.15 kWh/m².

For context, solar energy here swings from a low near 1.92 kWh/m² to a high of 7.42 kWh/m² in July across the year — September's 5.15 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
16.0Bright
25.9Bright
35.9Bright
45.8Bright
55.8Bright
65.7Bright
75.6Bright
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

Hazard calendar for Marinha Grande

In seasonPeak

None of Marinha Grande's seasonal hazards are active in September. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.

Marinha Grande's rainy season runs October–May, when most of the year's rain falls.

Rainy season
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is September a good time to visit Marinha Grande?

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

7.6
Sightseeing
4th-best month of the year
4.8
Beach & pool
3rd-best month of the year

September is one of the better times to visit Marinha Grande for general sightseeing.

What to pack for Marinha Grande in September

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

In September, Marinha Grande sees daytime highs around 21°C and nights near 16°C. Worth packing: sun protection. About 5 days see rain.

sun protection

Sea temperature near Marinha Grande 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 21 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 Marinha Grande 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 Marinha Grande 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 Marinha Grande?

Marinha Grande sits at 39.7°N, 8.9°W, 91 m above sea level, in Portugal. The nearest listed city is Leiria, 11 km away.

Topography around Marinha Grande

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

Within 3 km, the terrain around Marinha Grande has only modest variations in elevation — a maximum elevation change of 81 m around an average of 96 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 307 m; within 80 km, large variations in elevation — a maximum elevation change of 1,199 m.

The land around Marinha Grande is covered by trees (43%), artificial surfaces (28%) and grassland (26%) within 3 km, trees (41%) and grassland (28%) within 16 km, and trees (44%), water (28%) and grassland (20%) within 80 km.

3 km
81 m
16 km
307 m
80 km
1,199 m
treesshrubsgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Leiria 11 km · Alcobaça 22 km · Pombal 32 km · Monsanto 37 km · Caldas da Rainha 42 km · Torres Novas 45 km · Figueira da Foz 45 km · Tomar 48 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 Marinha Grande (39.7477°, -8.9323°, elevation 91 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).