Horsham weather in August

In August, Horsham sees average daytime highs of 21°C and overnight lows near 14°C, with 62 mm of rain across 9.5 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 20°C by the end. The sky is clear or mostly clear about 20% of the time in August, and the air most often feels dry.

Daylight stretches from about 15 h 12 min at the start of August to 13 h 24 min by month's end. Set against the rest of the year, August is Horsham's 2nd-clearest and 12th-windiest month. For the whole year in context, see Horsham's year-round climate.

Daytime high
21°
2nd warmest
Overnight low
14°
12th coldest
Rainfall
62 mm
9.5 wet days
Daylight
14 h 24 min
4:54 AM – 7:17 PM
Cloud cover
65%
2nd clearest
Wind
14 km/h
12th windiest
Solar energy
4.56 kWh/m²
Travel score
6.4
out of 10

Horsham is town and civil parish in West Sussex, England.

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 20°C by the end.

A typical August day in Horsham reaches about 21°C in the afternoon and slips back to 14°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 18°C and 25°C. Set against its neighbours, August runs on par with July and about 3°C warmer than September.

10°15°20°25°30°151015202531
Avg high (°C)Avg low (°C)
12214
22214
32214
42214
52114
62114
72114
82114
92114
102114
112114
122114
132114
142114
152114
162114
172114
182114
192114
202113
212113
222013
232013
242013
252013
262013
272013
282013
292013
302013
312013

How August really feels in Horsham

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.

Horsham 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 / 6511.40.68.21.1
Feb / 509.50.79.61.2
Mar10° / 45100.311.52.3
Apr13° / 4910.20.113.53.5
May16° / 529.6015.34.9
Jun19° / 11°529.3016.25.9
Jul21° / 13°5210015.96.4
Aug21° / 14°629.5014.46.4
Sep18° / 11°509.2012.45.8
Oct15° / 7011.5010.44.1
Nov11° / 7411.90.18.72.4
Dec / 7111.80.57.81.3

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 20% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 20% of August, with mostly cloudy or overcast conditions the remaining 60%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14555
24456
34456
44357
54357
64357
74357
84258
94258
104258
114258
124258
134258
144159
154159
164060
174060
184060
193961
203961
213961
223961
233961
243763
253763
263763
273664
283664
293763
303664
313664

Chance of precipitation in August

Any precipitation

Horsham gets around 62 mm of rain over 9.5 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 31% and peaks near 33% on the wettest days.

0%10%20%30%40%151015202531
Rain chance (%)
132
232
333
432
532
632
732
832
932
1032
1132
1232
1332
1432
1532
1632
1732
1832
1932
2031
2131
2231
2330
2430
2529
2629
2728
2828
2927
3027
3126

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 45% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
13947140
23947140
33947140
43946150
53946150
63945150
74045151
84044151
94143151
104143151
114243151
124242151
134242151
144242151
154342141
164342141
174342131
184443131
194543121
204542121
214642111
224741111
234941101
24514090
25523990
26543880
27553780
28563770
29573670
30583570
31603460

Wind in August

Winds average 14 km/h in August, the calmest month.

Across August, daily wind ranges from about 14 km/h on the calmest days to 14 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202531
Wind speed (km/h)Feels
114light breeze
214light breeze
314light breeze
414light breeze
514light breeze
614light breeze
714light breeze
814light breeze
914light breeze
1014light breeze
1114light breeze
1214light breeze
1314light breeze
1414light breeze
1514light breeze
1614light breeze
1714light breeze
1814light breeze
1914light breeze
2014light breeze
2114light breeze
2214light breeze
2314light breeze
2414light breeze
2514light breeze
2614light breeze
2714light breeze
2814light breeze
2914light breeze
3014light breeze
3114light breeze

Sunrise & sunset in August

DaylightNight

Daylight runs from about 15 h 12 min at the start of August to 13 h 24 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 4:31 AM to 5:18 AM, and sunset from 7:44 PM to 6:44 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
115.24:317:44
215.24:337:42
315.14:347:40
415.14:367:39
515.04:377:37
614.94:397:35
714.94:407:34
814.84:427:32
914.84:437:30
1014.74:457:28
1114.74:467:26
1214.64:487:24
1314.54:507:22
1414.54:517:20
1514.44:537:19
1614.44:547:17
1714.34:567:15
1814.34:577:12
1914.24:597:10
2014.15:017:08
2114.15:027:06
2214.05:047:04
2313.95:057:02
2413.95:077:00
2513.85:096:58
2613.85:106:55
2713.75:126:53
2813.65:146:51
2913.65:156:49
3013.55:176:47
3113.45:186:44

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 4.56 kWh/m².

For context, solar energy here swings from a low near 0.7 kWh/m² to a high of 5.66 kWh/m² in June across the year — August's 4.56 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.2Bright
25.1Bright
35.1Bright
45.1Bright
55.0Bright
65.0Bright
75.0Bright
84.9Bright
94.9Bright
104.8Bright
114.8Bright
124.7Bright
134.7Bright
144.7Bright
154.6Bright
164.6Bright
174.5Bright
184.5Bright
194.4Bright
204.4Bright
214.3Bright
224.3Bright
234.3Bright
244.2Bright
254.2Bright
264.1Bright
274.1Bright
284.1Bright
294.0Bright
304.0Moderate
314.0Moderate
Planning a trip in August

Is August a good time to visit Horsham?

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

6.4
Sightseeing
1st-best month of the year
3.8
Beach & pool
2nd-best month of the year

August is a reasonable time to visit Horsham for sightseeing.

What to pack for Horsham in August

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

In August, Horsham sees daytime highs around 21°C and nights near 14°C. Worth packing: rain gear and sun protection. About 10 days see rain.

rain gearsun protection

Sea temperature near Horsham 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 49 km away) is warmest in August at about 17°C and coldest in March near 8°C.

The water stays below 20°C all year — cool enough that most swimmers want a wetsuit.

5°10°15°20°JanFebMarAprMayJunJulAugSepOctNovDecbracingcool
Sea temperature (°C)Comfort
Jan10Bracing
Feb8Bracing
Mar8Bracing
Apr9Bracing
May11Bracing
Jun14Bracing
Jul16Cool
Aug17Cool
Sep17Cool
Oct16Cool
Nov14Bracing
Dec11Bracing

UV index in Horsham in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August 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 Horsham peaks around July 24 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.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighModerateLowJul 24UV 6Jan 1UV 1
UV index (midday)Level
Jan1Low
Feb1Low
Mar3Moderate
Apr4Moderate
May6High
Jun6High
Jul6High
Aug6High
Sep4Moderate
Oct2Moderate
Nov1Low
Dec1Low
Location & terrain

Where is Horsham?

Horsham sits at 51.1°N, 0.3°W, 52 m above sea level, in United Kingdom. The nearest listed city is Crawley, 12 km away.

Topography around Horsham

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

Within 3 km, the terrain around Horsham has only modest variations in elevation — a maximum elevation change of 83 m around an average of 58 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 298 m; within 80 km, significant variations in elevation — a maximum elevation change of 301 m.

The land around Horsham is covered by trees (43%) and grassland (33%) within 3 km, grassland (45%) and trees (40%) within 16 km, and trees (26%), grassland (26%) and water (25%) within 80 km.

3 km
83 m
16 km
298 m
80 km
301 m
treesgrasslandcroplandartificial surfaceswater
August weather nearby: Crawley 12 km · Horley 17 km · Haywards Heath 17 km · Burgess Hill 18 km · Dorking 19 km · Reigate 21 km · Redhill 23 km · East Grinstead 23 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 Horsham (51.0631°, -0.3276°, elevation 52 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).