Lumiar weather in September

In September, Lumiar sees average daytime highs of 23°C and overnight lows near 17°C, with 29 mm of rain across 4.1 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 24°C in the first days to 22°C by the end. The sky is clear or mostly clear about 63% 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 Lumiar's 4th-clearest and 11th-windiest month. For the whole year in context, see Lumiar's year-round climate.

Daytime high
23°
3rd warmest
Overnight low
17°
10th coldest
Rainfall
29 mm
4.1 wet days
Daylight
12 h 12 min
6:23 AM – 6:38 PM
Cloud cover
34%
4th clearest
Wind
16 km/h
11th windiest
Solar energy
5.28 kWh/m²
Travel score
8.3
out of 10

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 24°C in the first days to 22°C by the end.

A typical September day in Lumiar reaches about 23°C in the afternoon and slips back to 17°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 20°C and 26°C. Set against its neighbours, September runs about 1°C cooler than August and about 3°C warmer than October.

10°15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
12418
22418
32418
42418
52418
62418
72418
82418
92418
102418
112418
122318
132318
142318
152318
162317
172317
182317
192317
202317
212317
222317
232317
242217
252217
262217
272217
282217
292217
302217

Lumiar 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° / 10°688.99.64.2
Feb15° / 10°517.510.54.6
Mar16° / 11°538.111.75.5
Apr17° / 12°518.4136.0
May19° / 14°425.914.17.1
Jun22° / 16°102.114.78.4
Jul24° / 18°20.614.49.3
Aug24° / 18°4113.59.2
Sep23° / 17°294.112.38.3
Oct20° / 16°778.9116.7
Nov17° / 13°8210.29.95.5
Dec15° / 11°799.49.34.5

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 63% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 16% of September, with mostly cloudy or overcast conditions the remaining 21%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
18713
28713
38713
48515
58515
68515
78416
88218
98218
108218
118119
128119
138020
147921
157921
167822
177822
187723
197723
207624
217525
227525
237426
247525
257426
267228
277228
287129
297129
307030

Chance of precipitation in September

Any precipitation

Lumiar gets around 29 mm of rain over 4.1 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 13% and peaks near 19% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%151015202530
Rain chance (%)
15
25
35
46
56
66
77
88
98
109
1110
1211
1312
1413
1514
1615
1716
1816
1917
2018
2118
2219
2319
2419
2519
2619
2719
2819
2919
3019

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 (%)
1637525
2737515
3737515
4737515
5738505
6838495
7838495
8838485
9939485
10939475
11939475
121039465
131039465
141139455
151139454
161240444
171340444
181340434
191340433
201441423
211441423
221441413
231542413
241542403
251543393
261643383
271743373
281744363
291844344
301944334

Wind in September

Winds average 16 km/h in September.

Across September, daily wind ranges from about 16 km/h on the calmest days to 17 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202530
Wind speed (km/h)Feels
117light breeze
216light breeze
316light breeze
416light breeze
516light breeze
616light breeze
716light breeze
816light breeze
916light breeze
1016light breeze
1116light breeze
1216light breeze
1316light 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 6:10 AM to 6:37 AM, and sunset from 7:03 PM to 6:15 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.96:107:03
212.86:117:01
312.86:127:00
412.86:136:58
512.76:136:57
612.76:146:55
712.66:156:53
812.66:166:52
912.56:176:50
1012.56:186:48
1112.56:196:47
1212.46:206:45
1312.46:216:43
1412.36:226:42
1512.36:236:40
1612.26:236:38
1712.26:246:37
1812.26:256:35
1912.16:266:33
2012.16:276:32
2112.06:286:30
2212.06:296:28
2311.96:306:27
2411.96:316:25
2511.96:326:23
2611.86:336:22
2711.86:346:20
2811.76:356:19
2911.76:366:17
3011.66:376:15

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.28 kWh/m².

For context, solar energy here swings from a low near 2.01 kWh/m² to a high of 7.59 kWh/m² in July across the year — September's 5.28 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
16.1Intense
26.1Intense
36.0Intense
46.0Bright
55.9Bright
65.8Bright
75.8Bright
85.7Bright
95.7Bright
105.6Bright
115.5Bright
125.5Bright
135.4Bright
145.4Bright
155.3Bright
165.2Bright
175.2Bright
185.1Bright
195.1Bright
205.0Bright
215.0Bright
224.9Bright
234.8Bright
244.8Bright
254.7Bright
264.7Bright
274.6Bright
284.6Bright
294.5Bright
304.5Bright
Planning a trip in September

Is September a good time to visit Lumiar?

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

8.3
Sightseeing
4th-best month of the year
6.5
Beach & pool
3rd-best month of the year

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

What to pack for Lumiar in September

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

In September, Lumiar sees daytime highs around 23°C and nights near 17°C. Worth packing: light clothes and sun protection. About 4 days see rain.

light clothessun protection

Sea temperature near Lumiar 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 25 km away) 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
Apr15Cool
May16Cool
Jun18Cool
Jul18Cool
Aug19Cool
Sep19Cool
Oct18Cool
Nov17Cool
Dec16Cool

UV index in Lumiar 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 Lumiar 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.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateJul 15UV 9Dec 21UV 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 Lumiar?

Lumiar sits at 38.8°N, 9.2°W, 94 m above sea level, in Portugal. The nearest listed city is Campo Grande, 2.0 km away.

Topography around Lumiar

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

Within 3 km, the terrain around Lumiar has only modest variations in elevation — a maximum elevation change of 155 m around an average of 90 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 425 m; within 80 km, large variations in elevation — a maximum elevation change of 656 m.

The land around Lumiar is covered by artificial surfaces (64%) within 3 km, water (30%), artificial surfaces (25%) and grassland (23%) within 16 km, and water (40%), grassland (29%) and trees (20%) within 80 km.

3 km
155 m
16 km
425 m
80 km
656 m
treesshrubsgrasslandcroplandartificial surfaceswater
September weather nearby: Campo Grande 2.0 km · Carnide 3.0 km · Cidade Universitária 3.0 km · Alvalade 3.0 km · Odivelas 3.0 km · Sete Rios 4.0 km · Pontinha 4.0 km · Camarate 4.0 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 Lumiar (38.7748°, -9.156°, elevation 94 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).