Caldas da Rainha weather in September

In September, Caldas da Rainha sees average daytime highs of 22°C and overnight lows near 17°C, with 31 mm of rain across 4.8 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 57% 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 Caldas da Rainha's 3rd-clearest and 12th-windiest month. For the whole year in context, see Caldas da Rainha's year-round climate.

Daytime high
22°
3rd warmest
Overnight low
17°
11th coldest
Rainfall
31 mm
4.8 wet days
Daylight
12 h 18 min
6:23 AM – 6:38 PM
Cloud cover
38%
3rd clearest
Wind
17 km/h
12th windiest
Solar energy
5.16 kWh/m²
Travel score
7.8
out of 10

Caldas da Rainha is human settlement in 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 22°C through the month.

A typical September day in Caldas da Rainha reaches about 22°C in the afternoon and slips back to 17°C overnight — a 4°C spread between the day's warmth and the night's chill. On most days the high lands between 19°C and 25°C. Set against its neighbours, September runs about 1°C cooler than August and about 2°C warmer than October.

15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
12218
22218
32218
42218
52218
62218
72218
82218
92218
102218
112218
122218
132218
142217
152217
162217
172217
182217
192217
202217
212117
222117
232117
242117
252117
262117
272117
282117
292117
302117

Caldas da Rainha 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°7710.39.54.0
Feb14° / 11°558.210.54.4
Mar16° / 12°538.511.75.2
Apr17° / 13°549.3135.6
May19° / 14°457.214.16.7
Jun21° / 16°143.614.77.7
Jul22° / 17°61.814.58.6
Aug23° / 18°71.813.58.7
Sep22° / 17°314.812.37.8
Oct20° / 16°8210116.4
Nov17° / 13°8811.39.85.2
Dec15° / 11°799.99.34.4

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 25%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
18317
28317
38317
48218
58119
68119
77921
87921
97822
107822
117723
127723
137624
147525
157525
167525
177426
187426
197327
207228
217129
227129
237030
246931
256832
266832
276733
286634
296634
306535

Chance of precipitation in September

Any precipitation

Caldas da Rainha gets around 31 mm of rain over 4.8 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 16% and peaks near 21% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%151015202530
Rain chance (%)
18
28
39
49
59
610
710
811
912
1013
1114
1214
1315
1416
1517
1618
1718
1819
1920
2020
2120
2221
2321
2421
2521
2621
2721
2821
2921
3021

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 52% of days. Sticky, muggy-or-worse air turns up on roughly 6% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
1426646
2426646
3526636
4527626
5527617
6628597
7629587
8629587
9630577
10631567
11732547
12733537
13734527
14735517
15735517
16836497
17837496
18838496
19838485
20839485
21939485
22939484
23939474
24940474
251040464
261140454
271140444
281240434
291341424
301441414

Wind in September

Winds average 17 km/h in September, the calmest month.

Across September, daily wind ranges from about 17 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
217light breeze
317light breeze
417light breeze
517light breeze
617light breeze
717light breeze
817light breeze
917light breeze
1017light breeze
1117light breeze
1217light breeze
1317light breeze
1417light breeze
1517light breeze
1617light breeze
1717light breeze
1817light breeze
1917light breeze
2017light 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 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 6:09 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)
112.96:097:03
212.96:107:02
312.86:117:00
412.86:126:59
512.76:136:57
612.76:146:55
712.66:156:54
812.66:166:52
912.66:176:50
1012.56:186:49
1112.56:196:47
1212.46:196:45
1312.46:206:44
1412.36:216:42
1512.36:226:40
1612.36:236:38
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
2811.76:356:18
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 5.16 kWh/m².

For context, solar energy here swings from a low near 1.94 kWh/m² to a high of 7.39 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 Caldas da Rainha?

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

7.8
Sightseeing
3rd-best month of the year
5.3
Beach & pool
3rd-best month of the year

September is one of the better times to visit Caldas da Rainha for general sightseeing.

What to pack for Caldas da Rainha in September

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

In September, Caldas da Rainha sees daytime highs around 22°C and nights near 17°C. Worth packing: sun protection. About 5 days see rain.

sun protection

Sea temperature near Caldas da Rainha 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
Apr15Bracing
May16Cool
Jun18Cool
Jul18Cool
Aug19Cool
Sep19Cool
Oct18Cool
Nov17Cool
Dec15Cool

UV index in Caldas da Rainha 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 Caldas da Rainha 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 highVery 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 Caldas da Rainha?

Caldas da Rainha sits at 39.4°N, 9.1°W, 60 m above sea level, in Portugal. The nearest listed city is Peniche, 22 km away.

Topography around Caldas da Rainha

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

Within 3 km, the terrain around Caldas da Rainha has only modest variations in elevation — a maximum elevation change of 141 m around an average of 61 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 329 m; within 80 km, large variations in elevation — a maximum elevation change of 673 m.

The land around Caldas da Rainha is covered by grassland (39%), trees (33%) and artificial surfaces (23%) within 3 km, trees (43%) and grassland (30%) within 16 km, and water (32%), trees (31%) and grassland (26%) within 80 km.

3 km
141 m
16 km
329 m
80 km
673 m
treesshrubsgrasslandcroplandartificial surfaceswater
September weather nearby: Peniche 22 km · Alcobaça 22 km · Torres Vedras 36 km · Monsanto 37 km · Marinha Grande 42 km · Santarém 43 km · Azambuja 44 km · Leiria 47 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 Caldas da Rainha (39.4033°, -9.1384°, elevation 60 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).