Porto de Mós weather in September

In September, Porto de Mós sees average daytime highs of 22°C and overnight lows near 19°C, with 17 mm of rain across 2.7 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 22°C through the month. The sky is clear or mostly clear about 71% of the time in September, and the air most often feels humid.

Daylight stretches from about 12 h 48 min at the start of September to 11 h 42 min by month's end. Set against the rest of the year, September is Porto de Mós's 4th-clearest and 12th-windiest month. For the whole year in context, see Porto de Mós's year-round climate.

Daytime high
22°
3rd warmest
Overnight low
19°
11th coldest
Rainfall
17 mm
2.7 wet days
Daylight
12 h 12 min
6:22 AM – 6:36 PM
Cloud cover
28%
4th clearest
Wind
18 km/h
12th windiest
Solar energy
5.64 kWh/m²
Travel score
8.4
out of 10

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 22°C through the month.

A typical September day in Porto de Mós reaches about 22°C in the afternoon and slips back to 19°C overnight — a 3°C spread between the day's warmth and the night's chill. On most days the high lands between 20°C and 24°C. Set against its neighbours, September runs on par with August and about 2°C warmer than October.

15°18°20°23°25°151015202530
Avg high (°C)Avg low (°C)
12219
22219
32219
42219
52219
62219
72219
82219
92219
102219
112219
122219
132219
142219
152219
162219
172219
182219
192219
202219
212219
222119
232119
242119
252118
262118
272118
282118
292118
302118

Porto de Mós 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
Jan15° / 12°547.79.74.9
Feb15° / 12°476.310.65.0
Mar16° / 13°486.611.75.6
Apr17° / 14°376.312.96.1
May19° / 16°224.1147.3
Jun21° / 18°40.814.58.5
Jul22° / 19°00.114.39.2
Aug23° / 19°20.313.49.2
Sep22° / 19°172.712.38.4
Oct20° / 17°606.8117.1
Nov18° / 15°657.8106.2
Dec16° / 13°828.39.55.3

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 71% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 11% of September, with mostly cloudy or overcast conditions the remaining 18%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
1919
29010
39010
48911
58812
68713
78614
88614
98614
108416
118416
128416
138317
148317
158218
168218
178218
188119
198119
208020
218020
227921
237822
247822
257822
267723
277624
287525
297525
307426

Chance of precipitation in September

Any precipitation

Porto de Mós gets around 17 mm of rain over 2.7 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 9% and peaks near 13% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%151015202530
Rain chance (%)
13
23
33
43
54
64
75
85
96
107
117
128
139
149
1510
1610
1710
1811
1911
2011
2112
2212
2312
2412
2512
2612
2712
2812
2912
3013

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 55% of days. Sticky, muggy-or-worse air turns up on roughly 17% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
10176419
20176419
31176319
41186219
51186219
61196020
71196020
82205820
92215720
102215819
113225619
123235519
133235519
143245518
154255318
164265317
174265317
185275117
195285116
205285116
215285116
225295115
235295115
245295115
255305015
266305014
276305014
286305014
297304914
307304913

Wind in September

Winds average 18 km/h in September, the calmest month.

Across September, 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.

0510152025151015202530
Wind speed (km/h)Feels
118light breeze
218light breeze
318light breeze
418light breeze
518light breeze
618light breeze
718light breeze
818light breeze
918light breeze
1018light breeze
1118light breeze
1218light breeze
1318light breeze
1418light breeze
1518light breeze
1618light breeze
1718light breeze
1818light breeze
1918light breeze
2018light breeze
2117light breeze
2217light breeze
2317light breeze
2417light breeze
2517light breeze
2617light breeze
2717light breeze
2817light breeze
2917light breeze
3017light breeze

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 48 min at the start of September to 11 h 42 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 66 minutes over September. Sunrise moves from 6:09 AM to 6:34 AM, and sunset from 6:59 PM to 6:14 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.86:096:59
212.86:106:58
312.86:116:56
412.76:126:55
512.76:136:53
612.66:146:52
712.66:146:50
812.66:156:49
912.56:166:47
1012.56:176:46
1112.46:186:44
1212.46:196:42
1312.46:206:41
1412.36:206:39
1512.36:216:38
1612.26:226:36
1712.26:236:34
1812.26:246:33
1912.16:256:31
2012.16:256:30
2112.06:266:28
2212.06:276:27
2311.96:286:25
2411.96:296:23
2511.96:306:22
2611.86:316:20
2711.86:316:19
2811.76:326:17
2911.76:336:16
3011.76:346:14

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.64 kWh/m².

For context, solar energy here swings from a low near 2.31 kWh/m² to a high of 7.84 kWh/m² in July across the year — September's 5.64 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
16.4Intense
26.3Intense
36.3Intense
46.3Intense
56.2Intense
66.2Intense
76.1Intense
86.0Intense
96.0Intense
105.9Bright
115.9Bright
125.8Bright
135.8Bright
145.7Bright
155.7Bright
165.6Bright
175.6Bright
185.5Bright
195.5Bright
205.4Bright
215.3Bright
225.3Bright
235.2Bright
245.2Bright
255.1Bright
265.1Bright
275.0Bright
285.0Bright
294.9Bright
304.9Bright
Planning a trip in September

Is September a good time to visit Porto de Mós?

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

8.4
Sightseeing
4th-best month of the year
5.6
Beach & pool
3rd-best month of the year

September is one of the better times to visit Porto de Mós for general sightseeing.

What to pack for Porto de Mós in September

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

In September, Porto de Mós sees daytime highs around 22°C and nights near 19°C. Worth packing: sun protection.

sun protection

Sea temperature near Porto de Mós in September

The nearest coast averages about 20°C in September — 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 20°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°22°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshing
Sea temperature (°C)Comfort
Jan16Cool
Feb15Cool
Mar15Cool
Apr16Cool
May17Cool
Jun19Cool
Jul19Cool
Aug20Cool
Sep20Refreshing
Oct19Cool
Nov18Cool
Dec17Cool

UV index in Porto de Mós 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 Porto de Mós peaks around July 14 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 19 at about 2 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 9 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateVery highHighModerateJul 14UV 10Dec 19UV 2
UV index (midday)Level
Jan2Moderate
Feb3Moderate
Mar7High
Apr8Very high
May7Very high
Jun9Very high
Jul10Very high
Aug9Very high
Sep6High
Oct5High
Nov3Moderate
Dec2Low
Location & terrain

Where is Porto de Mós?

Porto de Mós sits at 37.1°N, 8.7°W, 18 m above sea level, in Portugal. The nearest listed city is Lagos, 2.0 km away.

Topography around Porto de Mós

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

Within 3 km, the terrain around Porto de Mós has only modest variations in elevation — a maximum elevation change of 106 m around an average of 19 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 231 m; within 80 km, large variations in elevation — a maximum elevation change of 894 m.

The land around Porto de Mós is covered by water (59%) and grassland (20%) within 3 km, water (54%) and grassland (22%) within 16 km, and water (52%) and grassland (20%) within 80 km.

3 km
106 m
16 km
231 m
80 km
894 m
treesshrubsgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Lagos 2.0 km · Portimão 14 km · Albufeira 38 km · Quarteira 52 km · Loulé 59 km · Faro 68 km · Olhão 75 km · Quelfes 77 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 Porto de Mós (37.0853°, -8.6837°, elevation 18 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).