Porthcawl weather in September

In September, Porthcawl sees average daytime highs of 17°C and overnight lows near 12°C, with 86 mm of rain across 12.3 wet days and about 12.4 hours of daylight. It is the 3rd-warmest and 6th-wettest month of the year here.

Highs ease over the month, from about 18°C in the first days to 16°C by the end. The sky is clear or mostly clear about 15% of the time in September, and the air most often feels dry.

Daylight stretches from about 13 h 24 min at the start of September to 11 h 24 min by month's end. Set against the rest of the year, September is Porthcawl's 6th-clearest and 7th-windiest month. For the whole year in context, see Porthcawl's year-round climate.

Daytime high
17°
3rd warmest
Overnight low
12°
10th coldest
Rainfall
86 mm
12.3 wet days
Daylight
12 h 24 min
5:57 AM – 6:21 PM
Cloud cover
70%
6th clearest
Wind
18 km/h
7th windiest
Solar energy
3.14 kWh/m²
Travel score
4.9
out of 10

Porthcawl is town in the county borough of Bridgend, Wales, UK.

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 18°C in the first days to 16°C by the end.

A typical September day in Porthcawl reaches about 17°C in the afternoon and slips back to 12°C overnight — a 5°C spread between the day's warmth and the night's chill. On most days the high lands between 14°C and 19°C. Set against its neighbours, September runs about 2°C cooler than August and about 3°C warmer than October.

10°15°20°25°151015202530
Avg high (°C)Avg low (°C)
11813
21813
31813
41813
51813
61813
71813
81712
91712
101712
111712
121712
131712
141712
151712
161712
171712
181712
191712
201712
211612
221612
231612
241611
251611
261611
271611
281611
291611
301511

How September really feels in Porthcawl

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.

Porthcawl weather by month

How September compares with the rest of the year at a glance. September is the 3rd-warmest and 6th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 11515.60.68.11.0
Feb / 8412.50.69.61.1
Mar / 7512.90.411.51.7
Apr12° / 6811.70.113.52.8
May14° / 7212.5015.33.9
Jun17° / 12°7511.8016.35.0
Jul18° / 14°8113.4015.95.5
Aug19° / 14°9313.7014.45.4
Sep17° / 12°8612.3012.44.9
Oct14° / 10°12215.2010.43.4
Nov11° / 12315.808.62.1
Dec / 13015.50.47.71.3

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 15% 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 68%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
13466
23466
33466
43367
53367
63367
73367
83565
93466
103466
113466
123466
133367
143466
153466
163466
173268
183268
193268
203268
213268
223070
233070
243070
253070
262872
272872
282872
292872
302872

Chance of precipitation in September

Any precipitation

Porthcawl gets around 86 mm of rain over 12.3 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 41% and peaks near 48% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
138
238
338
438
538
638
739
839
939
1039
1139
1239
1339
1439
1540
1640
1740
1840
1940
2041
2141
2242
2343
2444
2545
2646
2747
2847
2948
3048

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the dry band about 72% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
162344
263334
364324
465314
564315
665305
766295
867285
968275
1070264
1170264
1271254
1372244
1473243
1574233
1674233
1775232
1875232
1975232
2076231
2176231
2276231
2376231
2476231
2577221
2678211
2779201
2879201
2981190
3082180

Wind in September

Winds average 18 km/h in September.

Across September, daily wind ranges from about 17 km/h on the calmest days to 19 km/h at its breeziest. It stays fairly steady from day to day.

0510152025151015202530
Wind speed (km/h)Feels
117light breeze
217light breeze
317light breeze
417light breeze
517light 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
2118light breeze
2218light breeze
2318light breeze
2419light breeze
2519light breeze
2619light breeze
2719light breeze
2819light breeze
2919light breeze
3019light breeze

Sunrise & sunset in September

DaylightNight

Daylight runs from about 13 h 24 min at the start of September to 11 h 24 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 120 minutes over September. Sunrise moves from 5:33 AM to 6:21 AM, and sunset from 6:56 PM to 5:47 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.45:336:56
213.35:346:54
313.35:366:52
413.25:386:49
513.15:396:47
613.15:416:45
713.05:436:42
812.95:446:40
912.95:466:37
1012.85:486:35
1112.75:496:33
1212.75:516:30
1312.65:536:28
1412.55:546:26
1512.55:566:23
1612.45:576:21
1712.35:596:18
1812.36:016:16
1912.26:026:14
2012.16:046:11
2112.16:066:09
2212.06:076:06
2311.96:096:04
2411.86:116:02
2511.86:125:59
2611.76:145:57
2711.66:165:55
2811.66:175:52
2911.56:195:50
3011.46:215:47

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.14 kWh/m².

For context, solar energy here swings from a low near 0.65 kWh/m² to a high of 5.5 kWh/m² in June across the year — September's 3.14 kWh/m² falls in the middle.

01234151015202530
Solar energy (kWh/m²)Level
13.8Moderate
23.7Moderate
33.7Moderate
43.6Moderate
53.6Moderate
63.6Moderate
73.5Moderate
83.5Moderate
93.5Moderate
103.4Moderate
113.4Moderate
123.3Moderate
133.3Moderate
143.2Moderate
153.2Moderate
163.1Moderate
173.1Moderate
183.0Moderate
193.0Moderate
203.0Moderate
212.9Moderate
222.9Moderate
232.8Moderate
242.7Moderate
252.7Moderate
262.6Moderate
272.6Moderate
282.5Moderate
292.5Moderate
302.4Moderate
Planning a trip in September

Is September a good time to visit Porthcawl?

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

4.9
Sightseeing
4th-best month of the year
1.1
Beach & pool
3rd-best month of the year

September is a reasonable time to visit Porthcawl for sightseeing.

What to pack for Porthcawl in September

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

In September, Porthcawl sees daytime highs around 17°C and nights near 12°C. Worth packing: a warm layer and rain gear. About 12 days see rain.

a warm layerrain gear

Sea temperature near Porthcawl in September

The nearest coast averages about 17°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 13 km away) is warmest in August at about 18°C and coldest in February near 8°C.

The water stays below 20°C all year — cool enough that most swimmers want a wetsuit.

5°10°15°20°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshing
Sea temperature (°C)Comfort
Jan8Bracing
Feb8Bracing
Mar8Bracing
Apr9Bracing
May12Bracing
Jun14Bracing
Jul17Cool
Aug18Cool
Sep17Cool
Oct15Bracing
Nov12Bracing
Dec10Bracing

UV index in Porthcawl in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 4 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Porthcawl peaks around August 13 at about 6 (high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near January 1 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 6 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighModerateLowAug 13UV 6Jan 1UV 1
UV index (midday)Level
Jan1Low
Feb1Low
Mar3Moderate
Apr4Moderate
May6High
Jun6High
Jul6High
Aug7High
Sep4Moderate
Oct2Moderate
Nov1Low
Dec1Low
Location & terrain

Where is Porthcawl?

Porthcawl sits at 51.5°N, 3.7°W, 12 m above sea level, in United Kingdom. The nearest listed city is Bridgend, 9.0 km away.

Topography around Porthcawl

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

Within 3 km, the terrain around Porthcawl has only modest variations in elevation — a maximum elevation change of 95 m around an average of 11 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 381 m; within 80 km, large variations in elevation — a maximum elevation change of 864 m.

The land around Porthcawl is covered by water (57%) and grassland (22%) within 3 km, water (57%) and grassland (20%) within 16 km, and grassland (47%) and water (30%) within 80 km.

3 km
95 m
16 km
381 m
80 km
864 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Bridgend 9.0 km · Coity 11 km · Maesteg 15 km · Briton Ferry 19 km · Neath 22 km · Swansea 23 km · Tonypandy 23 km · Clydach 26 km

United Kingdom travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type D / G / M
230 V · 50 Hz
Prices
≈ 89% of US
price level, 2025
GDP per capita
$57,602
2025
Happiness
6.7 / 10
World Happiness, 2025
Safe drinking water
100%
of population, 2024
Homicide rate
1.1
per 100k, 2021
Road deaths
3.2
per 100k/yr, 2019
Income group
High
World Bank
Religion
Christian 60%none 26%Muslim 4%other 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 Porthcawl (51.479°, -3.7036°, elevation 12 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).