Llanelli weather in July

In July, Llanelli sees average daytime highs of 18°C and overnight lows near 13°C, with 91 mm of rain across 13.8 wet days and about 15.9 hours of daylight. It is the 2nd-warmest and 8th-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 15% of the time in July, and the air most often feels dry.

Daylight stretches from about 16 h 24 min at the start of July to 15 h 18 min by month's end. Set against the rest of the year, July is Llanelli's 3rd-clearest and 12th-windiest month. For the whole year in context, see Llanelli's year-round climate.

Daytime high
18°
2nd warmest
Overnight low
13°
11th coldest
Rainfall
91 mm
13.8 wet days
Daylight
16 hours
4:22 AM – 8:22 PM
Cloud cover
69%
3rd clearest
Wind
16 km/h
12th windiest
Solar energy
5.45 kWh/m²
Travel score
5.3
out of 10

Llanelli is town in Carmarthenshire, Wales.

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

Temperature in July

Average highAverage lowShaded bands: 10–90% of days

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

A typical July 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 21°C. Set against its neighbours, July runs about 2°C warmer than June and on par with August.

10°15°20°25°151015202531
Avg high (°C)Avg low (°C)
11713
21713
31713
41713
51813
61813
71813
81813
91813
101813
111813
121813
131813
141813
151813
161813
171813
181813
191813
201813
211814
221814
231814
241814
251814
261814
271814
281814
291814
301814
311814

How July really feels in Llanelli

Once humidity and wind are folded in, July 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

July 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 July compares with the rest of the year at a glance. July is the 2nd-warmest and 8th-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 July

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 15% of the time in July.

Beyond those clear spells, partly cloudy skies cover about 21% of July, with mostly cloudy or overcast conditions the remaining 65%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13565
23664
33664
43664
53664
63664
73565
83565
93664
103565
113565
123664
133565
143664
153664
163664
173763
183664
193664
203664
213664
223664
233565
243565
253664
263466
273466
283466
293466
303466
313367

Chance of precipitation in July

Any precipitation

Llanelli gets around 91 mm of rain over 13.8 wet days in July. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 44% and peaks near 47% on the wettest days.

0%20%40%60%151015202531
Rain chance (%)
147
247
347
447
547
647
747
846
946
1046
1145
1245
1344
1444
1543
1643
1742
1842
1942
2041
2142
2242
2342
2442
2543
2643
2744
2844
2945
3045
3146

Humidity in July

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, July 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 (%)
165323
263343
362353
461363
559383
658393
756404
855414
955414
1054424
1153434
1252435
1351445
1450455
1550455
1649465
1748465
1847476
1947486
2046486
2145496
2244496
2344506
2443507
2542517
2642517
2741527
2841527
2940537
3040528
3140528

Wind in July

Winds average 16 km/h in July, the calmest month.

Across July, daily wind ranges from about 16 km/h on the calmest days to 16 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
1616light breeze
1716light breeze
1816light breeze
1916light breeze
2016light breeze
2116light breeze
2216light breeze
2316light breeze
2416light breeze
2516light breeze
2616light breeze
2716light breeze
2816light breeze
2916light breeze
3016light breeze
3116light breeze

Sunrise & sunset in July

DaylightNight

Daylight runs from about 16 h 24 min at the start of July to 15 h 18 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 66 minutes over July. Sunrise moves from 4:09 AM to 4:43 AM, and sunset from 8:31 PM to 8:03 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
116.44:098:31
216.44:098:31
316.34:108:31
416.34:118:30
516.34:118:30
616.34:128:30
716.34:138:29
816.24:148:28
916.24:158:28
1016.24:168:27
1116.24:178:26
1216.14:188:26
1316.14:198:25
1416.14:208:24
1516.04:218:23
1616.04:228:22
1716.04:248:21
1815.94:258:20
1915.94:268:19
2015.84:278:18
2115.84:298:17
2215.84:308:16
2315.74:318:14
2415.74:338:13
2515.64:348:12
2615.64:358:10
2715.54:378:09
2815.54:388:07
2915.44:408:06
3015.44:418:04
3115.34:438:03

Solar energy in July

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in July, about 5.45 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 — July's 5.45 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
15.7Bright
25.7Bright
35.7Bright
45.7Bright
55.6Bright
65.6Bright
75.6Bright
85.6Bright
95.6Bright
105.6Bright
115.6Bright
125.5Bright
135.5Bright
145.5Bright
155.5Bright
165.5Bright
175.5Bright
185.5Bright
195.5Bright
205.4Bright
215.4Bright
225.4Bright
235.3Bright
245.3Bright
255.3Bright
265.3Bright
275.2Bright
285.2Bright
295.2Bright
305.1Bright
315.1Bright
Planning a trip in July

Is July a good time to visit Llanelli?

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

5.3
Sightseeing
1st-best month of the year
1.7
Beach & pool
2nd-best month of the year

July is a reasonable time to visit Llanelli for sightseeing.

What to pack for Llanelli in July

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

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

rain gearsun protection

Sea temperature near Llanelli in July

The nearest coast averages about 16°C in July — 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 July

LowModerateHighVery highExtreme

Clear-sky midday UV in July 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 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
July 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).