Swansea weather in August

In August, Swansea sees average daytime highs of 18°C and overnight lows near 15°C, with 101 mm of rain across 14.3 wet days and about 14.4 hours of daylight. It is the 1st-warmest and 5th-wettest month of the year here.

Day-to-day highs hold fairly steady near 18°C through the month. The sky is clear or mostly clear about 19% of the time in August, and the air most often feels dry.

Daylight stretches from about 15 h 18 min at the start of August to 13 h 30 min by month's end. Set against the rest of the year, August is Swansea's 5th-clearest and 10th-windiest month. For the whole year in context, see Swansea's year-round climate.

Daytime high
18°
1st warmest
Overnight low
15°
12th coldest
Rainfall
101 mm
14.3 wet days
Daylight
14 h 24 min
5:07 AM – 7:32 PM
Cloud cover
67%
5th clearest
Wind
19 km/h
10th windiest
Solar energy
4.45 kWh/m²
Travel score
5.2
out of 10

Swansea is city in Wales.

Air quality
Good
PM2.5 9.9 µg/m³ · 2019
Founded
1158

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

Temperature in August

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 18°C through the month.

A typical August day in Swansea reaches about 18°C in the afternoon and slips back to 15°C overnight — a 3°C spread between the day's warmth and the night's chill. On most days the high lands between 16°C and 20°C. Set against its neighbours, August runs on par with July and about 1°C warmer than September.

10°15°20°25°151015202531
Avg high (°C)Avg low (°C)
11815
21815
31815
41815
51815
61815
71815
81815
91815
101815
111815
121815
131815
141815
151815
161815
171815
181815
191815
201815
211815
221815
231815
241814
251814
261814
271814
281814
291814
301814
311714

Swansea weather by month

How August compares with the rest of the year at a glance. August is the 1st-warmest and 5th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 128170.48.11.1
Feb / 90130.69.61.1
Mar / 8313.70.311.51.6
Apr11° / 69120.113.62.5
May13° / 10°7212.4015.33.6
Jun16° / 12°7912.2016.34.6
Jul18° / 14°8613.8015.95.2
Aug18° / 15°10114.3014.45.2
Sep17° / 13°9613.2012.44.8
Oct14° / 11°14316.7010.43.4
Nov11° / 14317.308.62.2
Dec / 14516.80.37.71.4

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 19% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 18% of August, with mostly cloudy or overcast conditions the remaining 63%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13961
23961
33961
43862
53862
63862
73862
83862
93862
103862
113763
123763
133763
143763
153664
163664
173664
183664
193664
203664
213664
223664
233664
243664
253763
263763
273763
283763
293763
303664
313763

Chance of precipitation in August

Any precipitation

Swansea gets around 101 mm of rain over 14.3 wet days in August. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 46% and peaks near 49% on the wettest days.

0%20%40%60%151015202531
Rain chance (%)
146
246
346
446
546
646
746
846
946
1046
1146
1246
1346
1447
1547
1648
1748
1849
1949
2049
2148
2248
2347
2446
2545
2644
2743
2842
2941
3040
3140

Humidity in August

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, August lands in the dry band about 45% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
13554110
23652120
33751120
43849121
53948121
64047131
74146131
84245131
94244131
104343131
114442131
124442131
134442131
144442131
154442131
164442131
174442131
184543120
194543120
204643110
214743110
224842100
23494290
24504190
25514180
26514180
27534070
28534070
29544060
30553960
31573850

Wind in August

Winds average 19 km/h in August.

Across August, daily wind ranges from about 18 km/h on the calmest days to 20 km/h at its breeziest. It stays fairly steady from day to day.

0510152025151015202531
Wind speed (km/h)Feels
118light breeze
218light breeze
318light breeze
418light breeze
518light breeze
618light breeze
718light breeze
819light breeze
919light breeze
1019light breeze
1119light breeze
1219light breeze
1319light breeze
1419light breeze
1519light breeze
1619light breeze
1719light breeze
1819light breeze
1919light breeze
2019light breeze
2119light breeze
2219light breeze
2319light breeze
2419light breeze
2519light breeze
2619light breeze
2719light breeze
2819light breeze
2919light breeze
3019light breeze
3120light breeze

Sunrise & sunset in August

DaylightNight

Daylight runs from about 15 h 18 min at the start of August to 13 h 30 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 108 minutes over August. Sunrise moves from 4:44 AM to 5:32 AM, and sunset from 8:00 PM to 7:00 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
115.34:448:00
215.24:457:58
315.24:477:57
415.14:487:55
515.14:507:53
615.04:517:52
715.04:537:50
814.94:547:48
914.84:567:46
1014.84:587:44
1114.74:597:42
1214.75:017:40
1314.65:027:38
1414.55:047:37
1514.55:067:34
1614.45:077:32
1714.45:097:30
1814.35:117:28
1914.25:127:26
2014.25:147:24
2114.15:157:22
2214.05:177:20
2314.05:197:18
2413.95:207:15
2513.95:227:13
2613.85:247:11
2713.75:257:09
2813.75:277:07
2913.65:297:04
3013.55:307:02
3113.55:327:00

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 4.45 kWh/m².

For context, solar energy here swings from a low near 0.65 kWh/m² to a high of 5.63 kWh/m² in June across the year — August's 4.45 kWh/m² falls in the middle.

024151015202531
Solar energy (kWh/m²)Level
14.9Bright
24.9Bright
34.9Bright
44.8Bright
54.8Bright
64.8Bright
74.8Bright
84.7Bright
94.7Bright
104.7Bright
114.6Bright
124.6Bright
134.6Bright
144.5Bright
154.5Bright
164.4Bright
174.4Bright
184.4Bright
194.3Bright
204.3Bright
214.3Bright
224.2Bright
234.2Bright
244.1Bright
254.1Bright
264.1Bright
274.0Bright
284.0Bright
294.0Moderate
303.9Moderate
313.9Moderate
Planning a trip in August

Is August a good time to visit Swansea?

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

5.2
Sightseeing
1st-best month of the year
1.7
Beach & pool
1st-best month of the year

August is a reasonable time to visit Swansea for sightseeing.

What to pack for Swansea in August

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

In August, Swansea sees daytime highs around 18°C and nights near 15°C. Pack rain gear. About 14 days see rain.

rain gear

Sea temperature near Swansea in August

The nearest coast averages about 18°C in August — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea offshore 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
May11Bracing
Jun14Bracing
Jul16Cool
Aug18Cool
Sep17Cool
Oct15Cool
Nov12Bracing
Dec10Bracing

UV index in Swansea in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August 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 Swansea 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 Swansea?

Swansea sits at 51.6°N, 3.9°W, 18 m above sea level, in United Kingdom. The nearest listed city is Clydach, 8.0 km away.

Topography around Swansea

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

Within 3 km, the terrain around Swansea has only modest variations in elevation — a maximum elevation change of 194 m around an average of 44 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 422 m; within 80 km, large variations in elevation — a maximum elevation change of 878 m.

The land around Swansea is covered by artificial surfaces (34%), water (32%) and trees (23%) within 3 km, water (35%), grassland (28%) and trees (26%) within 16 km, and grassland (46%) and water (35%) within 80 km.

3 km
194 m
16 km
422 m
80 km
878 m
treesgrasslandcroplandartificial surfacesbare terrainwaterwetland
August weather nearby: Clydach 8.0 km · Briton Ferry 9.0 km · Gorseinon 9.0 km · Neath 11 km · Llanelli 17 km · Ammanford 19 km · Maesteg 20 km · Porthcawl 23 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 Swansea (51.6208°, -3.9432°, 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).