La Unión weather in September

In September, La Unión sees average daytime highs of 24°C and overnight lows near 22°C, with 33 mm of rain across 3.5 wet days and about 12.3 hours of daylight. It is the 3rd-warmest and 4th-wettest month of the year here.

Highs ease over the month, from about 25°C in the first days to 23°C by the end. The sky is clear or mostly clear about 62% of the time in September, and the air most often feels muggy.

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 La Unión's 4th-clearest and 9th-windiest month. For the whole year in context, see La Unión's year-round climate.

Daytime high
24°
3rd warmest
Overnight low
22°
10th coldest
Rainfall
33 mm
3.5 wet days
Daylight
12 h 12 min
6:51 AM – 7:05 PM
Cloud cover
36%
4th clearest
Wind
17 km/h
9th windiest
Solar energy
5.26 kWh/m²
Travel score
8.4
out of 10

La Unión is municipal capital of the homonymous municipality of Campo de Cartagena, 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 25°C in the first days to 23°C by the end.

A typical September day in La Unión reaches about 24°C in the afternoon and slips back to 22°C overnight — a 2°C spread between the day's warmth and the night's chill. On most days the high lands between 22°C and 26°C. Set against its neighbours, September runs about 2°C cooler than August and about 3°C warmer than October.

15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
12524
22524
32524
42524
52524
62523
72523
82523
92523
102523
112523
122523
132423
142423
152423
162422
172422
182422
192422
202422
212422
222422
232322
242322
252322
262321
272321
282321
292321
302321

La Unión weather by month

How September compares with the rest of the year at a glance. September is the 3rd-warmest and 4th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan14° / 12°354.69.75.0
Feb14° / 12°233.910.55.0
Mar15° / 13°294.311.75.5
Apr17° / 15°223.212.96.4
May19° / 17°162147.7
Jun22° / 21°50.814.58.9
Jul25° / 23°10.114.39.4
Aug26° / 24°61.313.48.9
Sep24° / 22°333.512.38.4
Oct21° / 19°364.3117.7
Nov18° / 16°395.8106.6
Dec15° / 13°304.79.45.5

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 62% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 13% of September, with mostly cloudy or overcast conditions the remaining 24%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
18515
28416
38416
48218
58119
68020
78020
87822
97723
107723
117624
127624
137525
147525
157525
167327
177327
187327
197228
207228
217228
227228
237228
247228
257228
267228
277327
287327
297327
307327

Chance of precipitation in September

Any precipitation

La Unión gets around 33 mm of rain over 3.5 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 11% and peaks near 15% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%151015202530
Rain chance (%)
17
28
38
48
58
68
78
88
99
109
119
129
1310
1410
1510
1611
1711
1812
1912
2013
2114
2214
2314
2415
2515
2615
2715
2815
2915
3015

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the muggy band about 47% of days. Sticky, muggy-or-worse air turns up on roughly 69% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
101103653
201103851
301114047
402124244
502124441
602134638
713134835
813144933
913145230
1014155228
1114165326
1225175224
1326175322
1426195221
1527205219
1627215218
1737225216
1838245015
1938255014
2038274912
2149284811
2249304810
234931479
244932468
255933467
265934456
2761035455
2861035445
2971036444
3071036433

Wind in September

Winds average 17 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
116light breeze
216light breeze
316light breeze
416light breeze
516light breeze
616light breeze
716light breeze
816light breeze
916light 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 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 6:38 AM to 7:03 AM, and sunset from 7:29 PM to 6:43 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.86:387:29
212.86:397:27
312.86:397:26
412.76:407:24
512.76:417:23
612.66:427:21
712.66:437:19
812.66:447:18
912.56:457:16
1012.56:467:15
1112.46:467:13
1212.46:477:11
1312.46:487:10
1412.36:497:08
1512.36:507:07
1612.26:517:05
1712.26:527:03
1812.26:527:02
1912.16:537:00
2012.16:546:59
2112.06:556:57
2212.06:566:55
2311.96:576:54
2411.96:586:52
2511.96:596:50
2611.86:596:49
2711.87:006:47
2811.77:016:46
2911.77:026:44
3011.77:036:43

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.26 kWh/m².

For context, solar energy here swings from a low near 2.37 kWh/m² to a high of 7.67 kWh/m² in June across the year — September's 5.26 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.9Bright
25.9Bright
35.8Bright
45.8Bright
55.8Bright
65.7Bright
75.7Bright
85.6Bright
95.6Bright
105.5Bright
115.5Bright
125.5Bright
135.4Bright
145.4Bright
155.3Bright
165.3Bright
175.2Bright
185.2Bright
195.1Bright
205.1Bright
215.0Bright
225.0Bright
234.9Bright
244.9Bright
254.8Bright
264.8Bright
274.8Bright
284.7Bright
294.7Bright
304.6Bright
Planning a trip in September

Is September a good time to visit La Unión?

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
7.1
Beach & pool
3rd-best month of the year

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

What to pack for La Unión in September

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

In September, La Unión sees daytime highs around 24°C and nights near 22°C. Worth packing: light clothes and sun protection. About 4 days see rain.

light clothessun protection

Sea temperature near La Unión in September

The nearest coast averages about 25°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 22 km away) is warmest in August at about 26°C and coldest in February near 14°C.

It's comfortable for a long swim from Jun 2 to Nov 4 — about 5.1 months when the water holds above 20°C.

15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan15Cool
Feb14Bracing
Mar15Bracing
Apr16Cool
May18Cool
Jun22Refreshing
Jul24Warm
Aug26Warm
Sep25Warm
Oct22Refreshing
Nov19Cool
Dec16Cool

UV index in La Unión in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 7 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in La Unión 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 (low).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateJul 14UV 10Dec 19UV 2
UV index (midday)Level
Jan2Moderate
Feb3Moderate
Mar6High
Apr7Very high
May7Very high
Jun9Very high
Jul10Very high
Aug7Very high
Sep7High
Oct5Moderate
Nov3Moderate
Dec2Low
Location & terrain

Where is La Unión?

La Unión sits at 37.6°N, 0.9°W, 104 m above sea level, in Spain. The nearest listed city is Atamaría, 7.0 km away.

Topography around La Unión

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

Within 3 km, the terrain around La Unión has significant variations in elevation — a maximum elevation change of 346 m around an average of 136 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 481 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,554 m.

The land around La Unión is covered by grassland (33%) within 3 km, water (48%) and cropland (21%) within 16 km, and water (45%) and grassland (20%) within 80 km.

3 km
346 m
16 km
481 m
80 km
1,554 m
treesshrubsgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Atamaría 7.0 km · Cartagena 10 km · Barrio de Peral 10 km · Los Alcázares 14 km · Torre-Pacheco 15 km · San Javier 21 km · San Pedro del Pinatar 25 km · Pilar de la Horadada 28 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 La Unión (37.6191°, -0.878°, elevation 104 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).