Llanelli weather in August

In August, Llanelli sees average daytime highs of 18°C and overnight lows near 13°C, with 103 mm of rain across 14.4 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 14% 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 Llanelli's 5th-clearest and 10th-windiest month. For the whole year in context, see Llanelli's year-round climate.

Daytime high
18°
1st warmest
Overnight low
13°
12th coldest
Rainfall
103 mm
14.4 wet days
Daylight
14 h 24 min
5:08 AM – 7:34 PM
Cloud cover
70%
5th clearest
Wind
16 km/h
10th windiest
Solar energy
4.54 kWh/m²
Travel score
5.2
out of 10

Llanelli is town in Carmarthenshire, Wales.

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 Llanelli reaches about 18°C in the afternoon and slips back to 13°C overnight — a 5°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 2°C warmer than September.

10°15°20°25°151015202531
Avg high (°C)Avg low (°C)
11814
21814
31814
41814
51814
61814
71814
81814
91814
101814
111814
121814
131814
141814
151814
161814
171814
181814
191813
201813
211813
221813
231813
241813
251813
261813
271813
281813
291813
301713
311713

How August really feels in Llanelli

Once humidity and wind are folded in, August 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

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

Llanelli 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 / 12916.50.58.11.0
Feb / 9513.10.69.61.1
Mar / 8413.60.511.51.7
Apr11° / 7512.70.113.62.6
May14° / 8013015.43.7
Jun16° / 11°8613.3016.34.6
Jul18° / 13°9113.8015.95.3
Aug18° / 13°10314.4014.45.2
Sep16° / 12°9712.8012.44.7
Oct14° / 10°14416.3010.43.3
Nov11° / 142170.18.62.0
Dec / 14216.10.47.71.3

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 14% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 19% of August, with mostly cloudy or overcast conditions the remaining 68%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13367
23268
33367
43367
53367
63367
73367
83268
93268
103367
113367
123268
133367
143367
153367
163268
173268
183268
193268
203268
213268
223367
233268
243268
253268
263367
273268
283268
293367
303367
313466

Chance of precipitation in August

Any precipitation

Llanelli gets around 103 mm of rain over 14.4 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
447
547
647
747
847
947
1047
1147
1247
1348
1448
1548
1649
1749
1849
1949
2048
2148
2247
2346
2445
2544
2643
2742
2841
2941
3040
3139

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 50% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)
141518
241518
342499
443489
5434710
6444610
7454410
8464311
9464211
10474111
11484111
12484011
13484012
14493912
15493912
16493911
17493911
18503911
19513910
20513910
2152399
2253389
2354388
2454388
2556377
2657376
2758366
2858366
2960355
3060355
3162344

Wind in August

Winds average 16 km/h in August.

Across August, 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.

05101520151015202531
Wind speed (km/h)Feels
116light breeze
216light breeze
316light breeze
416light breeze
516light breeze
616light breeze
716light breeze
816light breeze
916light breeze
1016light breeze
1116light breeze
1216light breeze
1316light breeze
1416light breeze
1516light 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
3117light 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 5:33 AM, and sunset from 8:01 PM to 7:01 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
115.34:448:01
215.24:468:00
315.24:477:58
415.14:497:56
515.14:507:54
615.04:527:53
715.04:537:51
814.94:557:49
914.84:577:47
1014.84:587:45
1114.75:007:43
1214.75:017:42
1314.65:037:40
1414.55:057:38
1514.55:067:36
1614.45:087:34
1714.45:107:31
1814.35:117:29
1914.25:137:27
2014.25:157:25
2114.15:167:23
2214.15:187:21
2314.05:197:19
2413.95:217:16
2513.95:237:14
2613.85:247:12
2713.75:267:10
2813.75:287:08
2913.65:297:05
3013.55:317:03
3113.55:337:01

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 4.54 kWh/m².

For context, solar energy here swings from a low near 0.65 kWh/m² to a high of 5.77 kWh/m² in June across the year — August's 4.54 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.0Bright
25.0Bright
35.0Bright
45.0Bright
54.9Bright
64.9Bright
74.8Bright
84.8Bright
94.8Bright
104.8Bright
114.7Bright
124.7Bright
134.7Bright
144.6Bright
154.6Bright
164.5Bright
174.5Bright
184.5Bright
194.4Bright
204.4Bright
214.3Bright
224.3Bright
234.3Bright
244.2Bright
254.2Bright
264.2Bright
274.1Bright
284.1Bright
294.0Bright
304.0Bright
314.0Moderate
Planning a trip in August

Is August a good time to visit Llanelli?

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

5.2
Sightseeing
2nd-best month of the year
1.7
Beach & pool
1st-best month of the year

August is a reasonable time to visit Llanelli for sightseeing.

What to pack for Llanelli in August

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

In August, Llanelli sees daytime highs around 18°C and nights near 13°C. Pack rain gear. Worth having: sun protection. About 14 days see rain.

rain gearsun protection

Sea temperature near Llanelli in August

The nearest coast averages about 17°C in August — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 16 km away) is warmest in August at about 17°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°JanFebMarAprMayJunJulAugSepOctNovDecbracingcool
Sea temperature (°C)Comfort
Jan9Bracing
Feb8Bracing
Mar8Bracing
Apr9Bracing
May11Bracing
Jun13Bracing
Jul16Cool
Aug17Cool
Sep17Cool
Oct15Cool
Nov13Bracing
Dec10Bracing

UV index in Llanelli 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 Llanelli 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 Llanelli?

Llanelli sits at 51.7°N, 4.2°W, 13 m above sea level, in United Kingdom. The nearest listed city is Gorseinon, 8.0 km away.

Topography around Llanelli

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

Within 3 km, the terrain around Llanelli has only modest variations in elevation — a maximum elevation change of 166 m around an average of 32 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 336 m; within 80 km, large variations in elevation — a maximum elevation change of 878 m.

The land around Llanelli is covered by grassland (27%), trees (25%) and artificial surfaces (23%) within 3 km, grassland (43%), trees (27%) and water (20%) within 16 km, and water (43%) and grassland (40%) within 80 km.

3 km
166 m
16 km
336 m
80 km
878 m
treesgrasslandcroplandartificial surfacesbare terrainwaterwetland
August weather nearby: Gorseinon 8.0 km · Swansea 17 km · Ammanford 17 km · Clydach 18 km · Carmarthen 22 km · Briton Ferry 24 km · Neath 25 km · Maesteg 36 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 Llanelli (51.682°, -4.1619°, elevation 13 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).