Gelligaer weather in August

In August, Gelligaer sees average daytime highs of 19°C and overnight lows near 12°C, with 90 mm of rain across 12.6 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 11% 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 Gelligaer's 4th-clearest and 12th-windiest month. For the whole year in context, see Gelligaer's year-round climate.

Daytime high
19°
2nd warmest
Overnight low
12°
11th coldest
Rainfall
90 mm
12.6 wet days
Daylight
14 h 24 min
5:04 AM – 7:30 PM
Cloud cover
72%
4th clearest
Wind
12 km/h
12th windiest
Solar energy
4.17 kWh/m²
Travel score
5.5
out of 10

Gelligaer is town in Caerphilly County Borough, Wales, UK.

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 Gelligaer reaches about 19°C in the afternoon and slips back to 12°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 16°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)
11912
21912
31912
41912
51912
61912
71912
81912
91912
101912
111912
121912
131912
141912
151912
161912
171912
181912
191912
201911
211911
221811
231811
241811
251811
261811
271811
281811
291811
301811
311811

How August really feels in Gelligaer

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.

Gelligaer 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 / 10014.61.78.10.5
Feb / 8011.41.99.60.7
Mar / 7612.71.411.51.6
Apr12° / 8012.90.513.62.8
May15° / 8913.6015.33.9
Jun17° / 10°8312.2016.35.0
Jul19° / 12°8413015.95.6
Aug19° / 12°9012.6014.45.5
Sep16° / 10°7711.2012.44.8
Oct13° / 11113.60.110.43.1
Nov / 10313.90.68.61.7
Dec / 10813.31.67.70.7

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 11% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 17% of August, with mostly cloudy or overcast conditions the remaining 72%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13070
23070
33070
43070
53070
62971
72971
82971
92971
102971
112971
122971
132971
142872
152872
162773
172773
182773
192674
202674
212773
222773
232773
242773
252773
262872
272872
282872
292872
302872
312773

Chance of precipitation in August

Any precipitation

Gelligaer gets around 90 mm of rain over 12.6 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 41% and peaks near 43% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%40%50%151015202531
Rain chance (%)
142
242
342
442
542
642
741
841
941
1041
1141
1241
1341
1441
1541
1642
1742
1843
1943
2043
2143
2242
2341
2440
2540
2639
2738
2837
2936
3035
3134

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 62% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)
155396
255396
356386
456377
556377
657367
758357
857358
958348
1058348
1159338
1259338
1360328
1460328
1560328
1661318
1761318
1862317
1963307
2063307
2164306
2265296
2367285
2467285
2569274
2670264
2771254
2872253
2973243
3074242
3175232

Wind in August

Winds average 12 km/h in August, the calmest month.

Across August, daily wind ranges from about 12 km/h on the calmest days to 12 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
112light breeze
212light breeze
312light breeze
412light breeze
512light breeze
612light breeze
712light breeze
812light breeze
912light breeze
1012light breeze
1112light breeze
1212light breeze
1312light breeze
1412light breeze
1512light breeze
1612light breeze
1712light breeze
1812light breeze
1912light breeze
2012light breeze
2112light breeze
2212light breeze
2312light breeze
2412light breeze
2512light breeze
2612light breeze
2712light breeze
2812light breeze
2912light breeze
3012light breeze
3112light 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 7:58 PM to 6:57 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
115.34:417:58
215.24:427:56
315.24:447:54
415.14:457:53
515.14:477:51
615.04:487:49
715.04:507:47
814.94:527:45
914.84:537:44
1014.84:557:42
1114.74:567:40
1214.74:587:38
1314.65:007:36
1414.55:017:34
1514.55:037:32
1614.45:047:30
1714.45:067:28
1814.35:087:26
1914.25:097:24
2014.25:117:21
2114.15:137:19
2214.05:147:17
2314.05:167:15
2413.95:187:13
2513.95:197:11
2613.85:217:08
2713.75:227:06
2813.75:247:04
2913.65:267:02
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 4.17 kWh/m².

For context, solar energy here swings from a low near 0.63 kWh/m² to a high of 5.27 kWh/m² in June across the year — August's 4.17 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
233.9Moderate
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 Gelligaer?

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

5.5
Sightseeing
2nd-best month of the year
2.2
Beach & pool
2nd-best month of the year

August is a reasonable time to visit Gelligaer for sightseeing.

What to pack for Gelligaer in August

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

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

rain gear

Sea temperature near Gelligaer 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 33 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
Jun15Bracing
Jul17Cool
Aug18Cool
Sep17Cool
Oct15Bracing
Nov12Bracing
Dec9Bracing

UV index in Gelligaer 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 Gelligaer 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 Gelligaer?

Gelligaer sits at 51.7°N, 3.3°W, 233 m above sea level, in United Kingdom. The nearest listed city is Blackwood, 3.0 km away.

Topography around Gelligaer

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

Within 3 km, the terrain around Gelligaer has significant variations in elevation — a maximum elevation change of 262 m around an average of 205 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 554 m; within 80 km, large variations in elevation — a maximum elevation change of 864 m.

The land around Gelligaer is covered by grassland (46%) and trees (36%) within 3 km, grassland (46%) and trees (42%) within 16 km, and grassland (52%) within 80 km.

3 km
262 m
16 km
554 m
80 km
864 m
treesgrasslandcroplandartificial surfaceswater
August weather nearby: Blackwood 3.0 km · Pontypridd 9.0 km · Caerphilly 10 km · Risca 12 km · Merthyr Tydfil 13 km · Ebbw Vale 13 km · Rhondda 13 km · Aberdare 14 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 Gelligaer (51.6644°, -3.2561°, elevation 233 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).