Caldes de Montbui weather in September

In September, Caldes de Montbui sees average daytime highs of 24°C and overnight lows near 14°C, with 94 mm of rain across 11.7 wet days and about 12.3 hours of daylight. It is the 4th-warmest and 2nd-wettest month of the year here.

Highs ease over the month, from about 26°C in the first days to 22°C by the end. The sky is clear or mostly clear about 37% of the time in September, and the air most often feels comfortable.

Daylight stretches from about 13 hours at the start of September to 11 h 36 min by month's end. Set against the rest of the year, September is Caldes de Montbui's 9th-clearest and 12th-windiest month. For the whole year in context, see Caldes de Montbui's year-round climate.

Daytime high
24°
4th warmest
Overnight low
14°
9th coldest
Rainfall
94 mm
11.7 wet days
Daylight
12 h 18 min
6:37 AM – 6:54 PM
Cloud cover
53%
9th clearest
Wind
6 km/h
12th windiest
Solar energy
4.25 kWh/m²
Travel score
6.6
out of 10

Caldes de Montbui is capital town of the municipality of Caldes de Montbui, Spain.

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

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 26°C in the first days to 22°C by the end.

A typical September day in Caldes de Montbui reaches about 24°C in the afternoon and slips back to 14°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 20°C and 27°C. Set against its neighbours, September runs about 4°C cooler than August and about 4°C warmer than October.

10°15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
12616
22616
32616
42616
52515
62515
72515
82515
92515
102515
112415
122414
132414
142414
152414
162414
172314
182314
192313
202313
212313
222313
232313
242213
252213
262213
272212
282212
292212
302212

How September really feels in Caldes de Montbui

Once humidity and wind are folded in, September averages 0 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C
0
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

September sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Caldes de Montbui weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan11° / 446.20.59.33.0
Feb12° / 406.91.110.33.6
Mar15° / 568.70.311.74.9
Apr17° / 8211.4013.15.4
May21° / 10°8111.3014.36.3
Jun25° / 14°648.90157.1
Jul28° / 17°528014.76.8
Aug28° / 17°669.7013.76.5
Sep24° / 14°9411.7012.36.6
Oct20° / 10°10110.7010.96.2
Nov15° / 657.709.74.6
Dec11° / 4360.493.2

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 37% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 20% of September, with mostly cloudy or overcast conditions the remaining 43%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15941
25842
35842
45842
55842
65842
75842
85842
95842
105842
115842
125842
135842
145842
155842
165743
175743
185644
195743
205644
215644
225545
235644
245545
255545
265545
275644
285644
295644
305644

Chance of precipitation in September

Any precipitation

Caldes de Montbui gets around 94 mm of rain over 11.7 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 39% and peaks near 41% on the wettest days.

0%10%20%30%40%50%151015202530
Rain chance (%)
140
241
341
441
541
640
740
840
940
1039
1139
1239
1339
1439
1539
1639
1739
1839
1939
2039
2139
2238
2338
2438
2538
2637
2737
2836
2936
3036

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the comfortable band about 37% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
19284617
29304516
310314414
411324413
512334311
613344310
71435439
81535427
91636416
101836415
111937404
122137394
132237383
142437363
152538352
162738342
172838322
183038311
193138291
203339271
213439261
223639241
233740231
243840211
253940201
264041191
274141181
284241161
294341151
304441141

Wind in September

Winds average 6 km/h in September, the calmest month.

Across September, daily wind ranges from about 6 km/h on the calmest days to 6 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
16calm
26calm
36calm
46calm
56calm
66calm
76calm
86calm
96calm
106calm
116calm
126calm
136calm
146calm
156calm
166calm
176calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 13 hours 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 84 minutes over September. Sunrise moves from 6:22 AM to 6:52 AM, and sunset from 7:20 PM to 6:29 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.06:227:20
212.96:237:19
312.96:247:17
412.86:257:15
512.86:267:14
612.76:277:12
712.76:287:10
812.76:297:08
912.66:307:06
1012.66:317:05
1112.56:327:03
1212.56:337:01
1312.46:346:59
1412.46:356:58
1512.36:366:56
1612.36:376:54
1712.26:386:52
1812.26:406:50
1912.16:416:48
2012.16:426:47
2112.06:436:45
2212.06:446:43
2311.96:456:41
2411.96:466:39
2511.86:476:38
2611.86:486:36
2711.76:496:34
2811.76:506:32
2911.76:516:31
3011.66:526:29

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.25 kWh/m².

For context, solar energy here swings from a low near 1.81 kWh/m² to a high of 6.6 kWh/m² in June across the year — September's 4.25 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.9Bright
24.8Bright
34.8Bright
44.7Bright
54.7Bright
64.7Bright
74.6Bright
84.6Bright
94.5Bright
104.5Bright
114.5Bright
124.4Bright
134.4Bright
144.3Bright
154.3Bright
164.3Bright
174.2Bright
184.2Bright
194.1Bright
204.1Bright
214.0Bright
224.0Bright
234.0Moderate
243.9Moderate
253.9Moderate
263.9Moderate
273.8Moderate
283.8Moderate
293.8Moderate
303.7Moderate
Planning a trip in September

Is September a good time to visit Caldes de Montbui?

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

6.6
Sightseeing
3rd-best month of the year
5.4
Beach & pool
4th-best month of the year

September is a reasonable time to visit Caldes de Montbui for sightseeing.

What to pack for Caldes de Montbui in September

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

In September, Caldes de Montbui sees daytime highs around 24°C and nights near 14°C. Worth packing: light clothes and rain gear. About 12 days see rain.

light clothesrain gear

Sea temperature near Caldes de Montbui in September

The nearest coast averages about 24°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 34 km away) is warmest in August at about 25°C and coldest in February near 13°C.

It's comfortable for a long swim from Jun 11 to Oct 23 — about 4.4 months when the water holds above 20°C.

10°15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan14Bracing
Feb13Bracing
Mar13Bracing
Apr14Bracing
May17Cool
Jun21Refreshing
Jul24Refreshing
Aug25Warm
Sep24Refreshing
Oct21Refreshing
Nov17Cool
Dec15Bracing

UV index in Caldes de Montbui 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 Caldes de Montbui 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 1 (low).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateLowJul 15UV 9Dec 20UV 1
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar5Moderate
Apr7High
May6High
Jun8Very high
Jul9Very high
Aug8Very high
Sep6High
Oct3Moderate
Nov2Moderate
Dec1Low
Location & terrain

Where is Caldes de Montbui?

Caldes de Montbui sits at 41.6°N, 2.2°E, 232 m above sea level, in Spain. The nearest listed city is Castellar del Vallès, 7.0 km away.

Topography around Caldes de Montbui

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

Within 3 km, the terrain around Caldes de Montbui has significant variations in elevation — a maximum elevation change of 413 m around an average of 273 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,055 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,518 m.

The land around Caldes de Montbui is covered by trees (51%) within 3 km, trees (56%) within 16 km, and trees (50%) and water (25%) within 80 km.

3 km
413 m
16 km
1,055 m
80 km
2,518 m
treesshrubsgrasslandcroplandartificial surfaceswater
September weather nearby: Castellar del Vallès 7.0 km · Parets del Vallès 9.0 km · Canovelles 10 km · Granollers 10 km · Mollet del Vallès 11 km · Sabadell 11 km · Santa Perpètua de Mogoda 11 km · Sant Quirze del Vallès 13 km

Spain travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type C / F
230 V · 50 Hz
Prices
≈ 65% of US
price level, 2025
GDP per capita
$38,627
2025
Happiness
6.5 / 10
World Happiness, 2025
Safe drinking water
99%
of population, 2024
Homicide rate
0.7
per 100k, 2023
Road deaths
3.9
per 100k/yr, 2019
Income group
High
World Bank
English
Moderate
EF EPI 540
Religion
Roman Catholic 58%atheist 16%agnostic 11%non-believer 11%

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 Caldes de Montbui (41.6333°, 2.1667°, elevation 232 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).