Crowborough weather in September

In September, Crowborough sees average daytime highs of 18°C and overnight lows near 11°C, with 51 mm of rain across 9.7 wet days and about 12.4 hours of daylight. It is the 4th-warmest and 9th-wettest month of the year here.

Highs ease over the month, from about 19°C in the first days to 17°C by the end. The sky is clear or mostly clear about 19% of the time in September, and the air most often feels dry.

Daylight stretches from about 13 h 24 min at the start of September to 11 h 30 min by month's end. Set against the rest of the year, September is Crowborough's 4th-clearest and 9th-windiest month. For the whole year in context, see Crowborough's year-round climate.

Daytime high
18°
4th warmest
Overnight low
11°
10th coldest
Rainfall
51 mm
9.7 wet days
Daylight
12 h 24 min
5:42 AM – 6:05 PM
Cloud cover
66%
4th clearest
Wind
15 km/h
9th windiest
Solar energy
3.39 kWh/m²
Travel score
5.8
out of 10

Crowborough is town in the Wealden district of East Sussex, England.

Density
1,595/km²
people per km²

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

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 19°C in the first days to 17°C by the end.

A typical September day in Crowborough reaches about 18°C in the afternoon and slips back to 11°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 15°C and 21°C. Set against its neighbours, September runs about 3°C cooler than August and about 4°C warmer than October.

10°15°20°25°151015202530
Avg high (°C)Avg low (°C)
12012
22012
32012
41912
51912
61912
71912
81912
91912
101912
111912
121912
131912
141812
151811
161811
171811
181811
191811
201811
211811
221811
231811
241711
251711
261711
271711
281711
291710
301710

How September really feels in Crowborough

Once humidity and wind are folded in, September 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

September sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Crowborough weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 9th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 6511.80.78.21.0
Feb / 519.70.89.61.1
Mar10° / 45100.411.52.2
Apr13° / 5010.50.113.53.4
May16° / 5410.3015.34.8
Jun19° / 11°529.4016.25.9
Jul21° / 13°5310.3015.96.4
Aug21° / 14°6410.2014.46.3
Sep18° / 11°519.7012.45.8
Oct15° / 7111.4010.44.1
Nov11° / 7311.90.18.72.3
Dec / 7211.70.77.81.3

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 19% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 16% of September, with mostly cloudy or overcast conditions the remaining 65%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
13565
23664
33664
43565
53664
63664
73763
83664
93763
103763
113763
123763
133763
143763
153763
163763
173763
183664
193565
203565
213565
223466
233565
243565
253367
263367
273367
283367
293268
303268

Chance of precipitation in September

Any precipitation

Crowborough gets around 51 mm of rain over 9.7 wet days in September. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 33% and peaks near 40% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%50%151015202530
Rain chance (%)
128
228
328
428
528
628
728
829
929
1030
1130
1230
1331
1431
1532
1632
1733
1833
1934
2035
2135
2236
2336
2437
2538
2638
2739
2839
2940
3040

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the dry band about 68% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
160337
261327
363307
463307
564297
665287
766277
866277
967267
1067267
1167267
1269256
1369256
1469256
1570255
1670255
1771254
1870264
1971263
2070273
2171272
2270282
2370282
2471281
2571281
2671281
2772271
2872271
2973261
3074251

Wind in September

Winds average 15 km/h in September.

Across September, daily wind ranges from about 15 km/h on the calmest days to 16 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202530
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
2516light breeze
2616light breeze
2716light breeze
2816light breeze
2916light breeze
3016light breeze

Sunrise & sunset in September

DaylightNight

Daylight runs from about 13 h 24 min at the start of September to 11 h 30 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 114 minutes over September. Sunrise moves from 5:18 AM to 6:05 AM, and sunset from 6:40 PM to 5:32 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.45:186:40
213.35:206:38
313.25:216:36
413.25:236:33
513.15:246:31
613.05:266:29
713.05:286:26
812.95:296:24
912.85:316:22
1012.85:326:19
1112.75:346:17
1212.65:366:15
1312.65:376:12
1412.55:396:10
1512.45:416:08
1612.45:426:05
1712.35:446:03
1812.25:456:00
1912.25:475:58
2012.15:495:56
2112.05:505:53
2212.05:525:51
2311.95:545:49
2411.95:555:46
2511.85:575:44
2611.75:595:42
2711.76:005:39
2811.66:025:37
2911.56:035:35
3011.56:055:32

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.39 kWh/m².

For context, solar energy here swings from a low near 0.71 kWh/m² to a high of 5.84 kWh/m² in June across the year — September's 3.39 kWh/m² falls in the middle.

012345151015202530
Solar energy (kWh/m²)Level
14.0Bright
24.0Bright
34.0Moderate
43.9Moderate
53.9Moderate
63.8Moderate
73.8Moderate
83.7Moderate
93.7Moderate
103.6Moderate
113.6Moderate
123.5Moderate
133.5Moderate
143.5Moderate
153.4Moderate
163.4Moderate
173.3Moderate
183.3Moderate
193.2Moderate
203.2Moderate
213.1Moderate
223.1Moderate
233.0Moderate
243.0Moderate
252.9Moderate
262.9Moderate
272.8Moderate
282.8Moderate
292.7Moderate
302.7Moderate
Planning a trip in September

Is September a good time to visit Crowborough?

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

5.8
Sightseeing
4th-best month of the year
2.1
Beach & pool
4th-best month of the year

September is a reasonable time to visit Crowborough for sightseeing.

What to pack for Crowborough in September

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

In September, Crowborough sees daytime highs around 18°C and nights near 11°C. Worth packing: rain gear. About 10 days see rain.

rain gear

Sea temperature near Crowborough in September

The nearest coast averages about 17°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 38 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
Jan9Bracing
Feb8Bracing
Mar8Bracing
Apr9Bracing
May11Bracing
Jun13Bracing
Jul16Cool
Aug17Cool
Sep17Cool
Oct16Cool
Nov14Bracing
Dec11Bracing

UV index in Crowborough in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 4 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Crowborough 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 Crowborough?

Crowborough sits at 51.1°N, 0.2°E, 201 m above sea level, in United Kingdom. The nearest listed city is Royal Tunbridge Wells, 11 km away.

Topography around Crowborough

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

Within 3 km, the terrain around Crowborough has only modest variations in elevation — a maximum elevation change of 184 m around an average of 146 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 239 m; within 80 km, significant variations in elevation — a maximum elevation change of 303 m.

The land around Crowborough is covered by trees (66%) and grassland (25%) within 3 km, trees (48%) and grassland (41%) within 16 km, and water (31%), grassland (24%) and trees (23%) within 80 km.

3 km
184 m
16 km
239 m
80 km
303 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Royal Tunbridge Wells 11 km · Uckfield 11 km · East Grinstead 14 km · Tonbridge 17 km · Haywards Heath 20 km · Hailsham 23 km · Lewes 23 km · Sevenoaks 24 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 Crowborough (51.061°, 0.1634°, elevation 201 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).