Portishead weather in August

In August, Portishead sees average daytime highs of 20°C and overnight lows near 13°C, with 71 mm of rain across 10.8 wet days and about 14.4 hours of daylight. It is the 2nd-warmest and 5th-wettest month of the year here.

Highs ease over the month, from about 21°C in the first days to 19°C by the end. The sky is clear or mostly clear about 13% 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 Portishead's 3rd-clearest and 12th-windiest month. For the whole year in context, see Portishead's year-round climate.

Daytime high
20°
2nd warmest
Overnight low
13°
11th coldest
Rainfall
71 mm
10.8 wet days
Daylight
14 h 24 min
5:03 AM – 7:27 PM
Cloud cover
70%
3rd clearest
Wind
13 km/h
12th windiest
Solar energy
4.08 kWh/m²
Travel score
6.1
out of 10

Portishead is town in Somerset, England, United Kingdom.

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

Temperature in August

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 21°C in the first days to 19°C by the end.

A typical August day in Portishead reaches about 20°C in the afternoon and slips back to 13°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 17°C and 24°C. Set against its neighbours, August runs on par with July and about 2°C warmer than September.

10°15°20°25°30°151015202531
Avg high (°C)Avg low (°C)
12113
22113
32113
42113
52113
62113
72113
82113
92113
102113
112113
122113
132113
142113
152013
162013
172013
182013
192013
202013
212013
222013
232013
242013
252012
262012
272012
282012
291912
301912
311912

How August really feels in Portishead

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.

Portishead 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 / 72130.88.11.1
Feb / 5710.50.89.61.3
Mar10° / 5710.80.511.52.3
Apr13° / 6311.60.113.53.4
May16° / 6711.7015.34.7
Jun19° / 11°6210.7016.35.7
Jul21° / 13°6110.7015.96.2
Aug20° / 13°7110.8014.46.1
Sep18° / 11°579.4012.45.6
Oct14° / 7912.3010.43.8
Nov11° / 7713.20.18.62.2
Dec / 7912.20.57.71.3

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 13% 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 67%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13763
23763
33664
43664
53565
63565
73466
83466
93466
103367
113367
123367
133367
143169
153169
163169
173169
183070
193070
203169
213169
223169
233268
243169
253169
263268
273268
283268
293169
303169
313268

Chance of precipitation in August

Any precipitation

Portishead gets around 71 mm of rain over 10.8 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 35% and peaks near 37% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%40%50%151015202531
Rain chance (%)
137
237
337
437
537
637
737
837
936
1036
1136
1235
1335
1435
1535
1635
1736
1836
1936
2036
2135
2235
2334
2433
2533
2632
2731
2830
2930
3029
3128

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 52% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
14446100
24445100
34544111
44543111
54642111
64740121
74839121
84839121
94938121
105037121
115037121
125136121
135136121
145136121
155136121
165236111
175236111
185236111
195237101
205337100
21553690
22553690
23553690
24573580
25573580
26583570
27593470
28603460
29613360
30623350
31633250

Wind in August

Winds average 13 km/h in August, the calmest month.

Across August, daily wind ranges from about 13 km/h on the calmest days to 13 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202531
Wind speed (km/h)Feels
113light breeze
213light breeze
313light breeze
413light breeze
513light breeze
613light breeze
713light breeze
813light breeze
913light breeze
1013light breeze
1113light breeze
1213light breeze
1313light breeze
1413light breeze
1513light breeze
1613light breeze
1713light breeze
1813light breeze
1913light breeze
2013light breeze
2113light breeze
2213light breeze
2313light breeze
2413light breeze
2513light breeze
2613light breeze
2713light breeze
2813light breeze
2913light breeze
3013light breeze
3113light 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 4:39 AM to 5:27 AM, and sunset from 7:55 PM to 6:55 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
115.34:397:55
215.24:417:53
315.24:427:52
415.14:447:50
515.04:457:48
615.04:477:46
714.94:497:45
814.94:507:43
914.84:527:41
1014.84:537:39
1114.74:557:37
1214.64:577:35
1314.64:587:33
1414.55:007:31
1514.55:017:29
1614.45:037:27
1714.35:057:25
1814.35:067:23
1914.25:087:21
2014.25:097:19
2114.15:117:17
2214.05:137:15
2314.05:147:13
2413.95:167:10
2513.85:187:08
2613.85:197:06
2713.75:217:04
2813.75:237:02
2913.65:246:59
3013.55:266:57
3113.55:276:55

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 4.08 kWh/m².

For context, solar energy here swings from a low near 0.64 kWh/m² to a high of 5.14 kWh/m² in June across the year — August's 4.08 kWh/m² falls in the middle.

024151015202531
Solar energy (kWh/m²)Level
14.5Bright
24.5Bright
34.5Bright
44.5Bright
54.4Bright
64.4Bright
74.4Bright
84.3Bright
94.3Bright
104.3Bright
114.3Bright
124.2Bright
134.2Bright
144.2Bright
154.1Bright
164.1Bright
174.1Bright
184.0Bright
194.0Moderate
204.0Moderate
213.9Moderate
223.9Moderate
233.9Moderate
243.8Moderate
253.8Moderate
263.8Moderate
273.7Moderate
283.7Moderate
293.7Moderate
303.6Moderate
313.6Moderate
Planning a trip in August

Is August a good time to visit Portishead?

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

6.1
Sightseeing
2nd-best month of the year
3.3
Beach & pool
2nd-best month of the year

August is a reasonable time to visit Portishead for sightseeing.

What to pack for Portishead in August

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

In August, Portishead sees daytime highs around 20°C and nights near 13°C. Worth packing: rain gear. About 11 days see rain.

rain gear

Sea temperature near Portishead 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 14 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
Mar7Bracing
Apr9Bracing
May12Bracing
Jun15Cool
Jul18Cool
Aug18Cool
Sep17Cool
Oct15Bracing
Nov12Bracing
Dec9Bracing

UV index in Portishead 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 Portishead peaks around August 12 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 12UV 6Jan 1UV 1
UV index (midday)Level
Jan1Low
Feb1Low
Mar3Moderate
Apr4Moderate
May6High
Jun6High
Jul6High
Aug7High
Sep4Moderate
Oct2Moderate
Nov1Low
Dec1Low
Location & terrain

Where is Portishead?

Portishead sits at 51.5°N, 2.8°W, 13 m above sea level, in United Kingdom. The nearest listed city is Nailsea, 6.0 km away.

Topography around Portishead

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

Within 3 km, the terrain around Portishead has only modest variations in elevation — a maximum elevation change of 152 m around an average of 23 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 232 m; within 80 km, large variations in elevation — a maximum elevation change of 864 m.

The land around Portishead is covered by water (33%), grassland (29%) and trees (20%) within 3 km, grassland (35%) and water (32%) within 16 km, and grassland (51%) within 80 km.

3 km
152 m
16 km
232 m
80 km
864 m
treesgrasslandcroplandartificial surfaceswater
August weather nearby: Nailsea 6.0 km · Clevedon 8.0 km · Bristol 12 km · Kingswood 18 km · Mangotsfield 18 km · Newport 20 km · Keynsham 20 km · Weston-super-Mare 21 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 Portishead (51.482°, -2.7697°, 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).