Caerphilly weather in August

In August, Caerphilly sees average daytime highs of 19°C and overnight lows near 13°C, with 87 mm of rain across 12.3 wet days and about 14.4 hours of daylight. It is the 2nd-warmest and 5th-wettest month of the year here.

Day-to-day highs hold fairly steady near 19°C through the month. The sky is clear or mostly clear about 16% 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 Caerphilly's 4th-clearest and 10th-windiest month. For the whole year in context, see Caerphilly's year-round climate.

Daytime high
19°
2nd warmest
Overnight low
13°
12th coldest
Rainfall
87 mm
12.3 wet days
Daylight
14 h 24 min
5:04 AM – 7:29 PM
Cloud cover
69%
4th clearest
Wind
15 km/h
10th windiest
Solar energy
4.19 kWh/m²
Travel score
5.7
out of 10

Caerphilly is town and community in 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 19°C through the month.

A typical August day in Caerphilly reaches about 19°C in the afternoon and slips back to 13°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 17°C and 22°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)
12014
22014
32014
42014
52014
62014
72014
82014
92014
102014
111914
121914
131914
141914
151914
161914
171914
181913
191913
201913
211913
221913
231913
241913
251913
261913
271913
281913
291813
301813
311813

How August really feels in Caerphilly

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.

Caerphilly weather by month

How August compares with the rest of the year at a glance. August is the 2nd-warmest and 5th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 9514.50.98.11.0
Feb / 7411.20.99.61.1
Mar / 6811.70.511.51.9
Apr12° / 7011.60.113.63.0
May15° / 7312.3015.34.2
Jun17° / 12°7111016.35.3
Jul19° / 13°7411.7015.95.8
Aug19° / 13°8712.3014.45.7
Sep17° / 11°7411012.45.2
Oct14° / 10614010.43.5
Nov10° / 10214.50.18.62.1
Dec / 10713.70.67.71.2

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 16% 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 67%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13961
23862
33862
43862
53664
63664
73565
83466
93466
103466
113367
123367
133367
143268
153268
163268
173169
183169
193169
203268
213268
223268
233268
243268
253268
263268
273268
283268
293268
303367
313367

Chance of precipitation in August

Any precipitation

Caerphilly gets around 87 mm of rain over 12.3 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 39% and peaks near 42% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%40%50%151015202531
Rain chance (%)
141
241
341
442
541
641
741
841
941
1040
1140
1240
1340
1440
1540
1640
1740
1841
1941
2040
2140
2240
2339
2438
2537
2637
2736
2835
2934
3033
3133

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 51% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
14247100
24346101
34445111
44444111
54543111
64641111
74740111
84840121
94839111
104938111
114938111
125038111
135038111
145038111
155038111
165138101
175138101
185138101
195138101
20523891
21533890
22543880
23543880
24553780
25563770
26573670
27583660
28593560
29593560
30613450
31613450

Wind in August

Winds average 15 km/h in August.

Across August, daily wind ranges from about 15 km/h on the calmest days to 15 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202531
Wind speed (km/h)Feels
115light breeze
215light breeze
315light breeze
415light breeze
515light breeze
615light breeze
715light breeze
815light breeze
915light breeze
1015light breeze
1115light breeze
1215light breeze
1315light breeze
1415light breeze
1515light breeze
1615light breeze
1715light breeze
1815light breeze
1915light breeze
2015light breeze
2115light breeze
2215light breeze
2315light breeze
2415light breeze
2515light breeze
2615light breeze
2715light breeze
2815light breeze
2915light breeze
3015light breeze
3115light 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 4:41 AM to 5:29 AM, and sunset from 7:57 PM to 6:57 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
115.34:417:57
215.24:427:55
315.24:447:54
415.14:457:52
515.14:477:50
615.04:497:49
714.94:507:47
814.94:527:45
914.84:537:43
1014.84:557:41
1114.74:567:39
1214.74:587:37
1314.65:007:35
1414.55:017:33
1514.55:037:31
1614.45:047:29
1714.45:067:27
1814.35:087:25
1914.25:097:23
2014.25:117:21
2114.15:137:19
2214.05:147:17
2314.05:167:15
2413.95:187:12
2513.95:197:10
2613.85:217:08
2713.75:237:06
2813.75:247:04
2913.65:267:01
3013.55:276:59
3113.55:296:57

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 4.19 kWh/m².

For context, solar energy here swings from a low near 0.65 kWh/m² to a high of 5.28 kWh/m² in June across the year — August's 4.19 kWh/m² falls in the middle.

024151015202531
Solar energy (kWh/m²)Level
14.7Bright
24.6Bright
34.6Bright
44.6Bright
54.5Bright
64.5Bright
74.5Bright
84.5Bright
94.4Bright
104.4Bright
114.4Bright
124.3Bright
134.3Bright
144.3Bright
154.2Bright
164.2Bright
174.2Bright
184.1Bright
194.1Bright
204.0Bright
214.0Bright
224.0Moderate
234.0Moderate
243.9Moderate
253.9Moderate
263.8Moderate
273.8Moderate
283.8Moderate
293.7Moderate
303.7Moderate
313.7Moderate
Planning a trip in August

Is August a good time to visit Caerphilly?

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

5.7
Sightseeing
2nd-best month of the year
2.5
Beach & pool
2nd-best month of the year

August is a reasonable time to visit Caerphilly for sightseeing.

What to pack for Caerphilly in August

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

In August, Caerphilly sees daytime highs around 19°C and nights near 13°C. Worth packing: rain gear. About 12 days see rain.

rain gear

Sea temperature near Caerphilly 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 at the nearest coast (about 23 km away) is warmest in August at about 18°C and coldest in February near 7°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
Feb7Bracing
Mar8Bracing
Apr9Bracing
May12Bracing
Jun15Cool
Jul17Cool
Aug18Cool
Sep17Cool
Oct15Bracing
Nov12Bracing
Dec9Bracing

UV index in Caerphilly 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 Caerphilly 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 Caerphilly?

Caerphilly sits at 51.6°N, 3.2°W, 94 m above sea level, in United Kingdom. The nearest listed city is Risca, 9.0 km away.

Topography around Caerphilly

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

Within 3 km, the terrain around Caerphilly has only modest variations in elevation — a maximum elevation change of 222 m around an average of 142 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 473 m; within 80 km, large variations in elevation — a maximum elevation change of 864 m.

The land around Caerphilly is covered by trees (50%), grassland (29%) and artificial surfaces (20%) within 3 km, grassland (39%) and trees (38%) within 16 km, and grassland (51%) within 80 km.

3 km
222 m
16 km
473 m
80 km
864 m
treesgrasslandcroplandartificial surfaceswater
August weather nearby: Risca 9.0 km · Pontypridd 9.0 km · Gelligaer 10 km · Blackwood 10 km · Cardiff 11 km · Newport 15 km · Penarth 15 km · Cwmbran 16 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 Caerphilly (51.5745°, -3.218°, elevation 94 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).