Swanscombe weather in September

In September, Swanscombe sees average daytime highs of 18°C and overnight lows near 12°C, with 45 mm of rain across 8.7 wet days and about 12.4 hours of daylight. It is the 4th-warmest and 10th-wettest month of the year here.

Highs ease over the month, from about 20°C in the first days to 17°C by the end. The sky is clear or mostly clear about 16% 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 24 min by month's end. Set against the rest of the year, September is Swanscombe's 4th-clearest and 9th-windiest month. For the whole year in context, see Swanscombe's year-round climate.

Daytime high
18°
4th warmest
Overnight low
12°
9th coldest
Rainfall
45 mm
8.7 wet days
Daylight
12 h 24 min
5:41 AM – 6:05 PM
Cloud cover
68%
4th clearest
Wind
14 km/h
9th windiest
Solar energy
3.17 kWh/m²
Travel score
5.9
out of 10

Swanscombe is small town in the Dartford Borough of Kent, England, United Kingdom.

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 20°C in the first days to 17°C by the end.

A typical September day in Swanscombe reaches about 18°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 15°C and 22°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)
12013
22013
32012
42012
52012
61912
71912
81912
91912
101912
111912
121912
131912
141912
151912
161811
171811
181811
191811
201811
211811
221811
231811
241811
251711
261711
271711
281711
291710
301710

How September really feels in Swanscombe

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.

Swanscombe weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 10th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 5110.80.78.11.0
Feb / 439.219.61.2
Mar10° / 409.70.611.52.3
Apr13° / 4610.80.113.53.5
May16° / 5010015.34.9
Jun19° / 12°539.7016.36.0
Jul21° / 14°5310.2015.96.4
Aug21° / 14°609.9014.46.4
Sep18° / 12°458.7012.45.9
Oct15° / 5610.5010.44.2
Nov11° / 5810.70.18.62.4
Dec / 56110.87.71.2

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 16% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 18% of September, with mostly cloudy or overcast conditions the remaining 67%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
13565
23565
33565
43565
53664
63664
73664
83664
93664
103664
113664
123664
133565
143466
153466
163367
173367
183268
193268
203268
213268
223070
233169
243169
253169
263070
273070
283169
293169
303169

Chance of precipitation in September

Any precipitation

Swanscombe gets around 45 mm of rain over 8.7 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 29% and peaks near 36% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%50%151015202530
Rain chance (%)
126
225
325
425
525
625
726
826
926
1027
1127
1227
1327
1428
1528
1628
1729
1829
1930
2031
2131
2232
2332
2433
2534
2634
2735
2836
2936
3036

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 70% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
161327
262317
364306
465296
565287
665287
766277
867267
967267
1068257
1169256
1270246
1370246
1472235
1572235
1673234
1773234
1873243
1973243
2074242
2173252
2274251
2374251
2474251
2574251
2675250
2775250
2876240
2977230
3078220

Wind in September

Winds average 14 km/h in September.

Across September, daily wind ranges from about 13 km/h on the calmest days to 15 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202530
Wind speed (km/h)Feels
113light 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
2915light breeze
3015light breeze

Sunrise & sunset in September

DaylightNight

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

Days shrink by about 120 minutes over September. Sunrise moves from 5:17 AM to 6:05 AM, and sunset from 6:40 PM to 5:31 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.45:176:40
213.35:186:38
313.35:206:35
413.25:226:33
513.15:236:31
613.15:256:28
713.05:276:26
812.95:286:24
912.95:306:21
1012.85:326:19
1112.75:336:17
1212.75:356:14
1312.65:376:12
1412.55:386:10
1512.55:406:07
1612.45:416:05
1712.35:436:02
1812.35:456:00
1912.25:465:58
2012.15:485:55
2112.15:505:53
2212.05:515:50
2311.95:535:48
2411.85:555:46
2511.85:565:43
2611.75:585:41
2711.66:005:38
2811.66:015:36
2911.56:035:34
3011.46:055:31

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.17 kWh/m².

For context, solar energy here swings from a low near 0.66 kWh/m² to a high of 5.47 kWh/m² in June across the year — September's 3.17 kWh/m² falls in the middle.

01234151015202530
Solar energy (kWh/m²)Level
13.8Moderate
23.8Moderate
33.7Moderate
43.7Moderate
53.6Moderate
63.6Moderate
73.5Moderate
83.5Moderate
93.5Moderate
103.4Moderate
113.4Moderate
123.3Moderate
133.3Moderate
143.2Moderate
153.2Moderate
163.1Moderate
173.1Moderate
183.0Moderate
193.0Moderate
203.0Moderate
212.9Moderate
222.9Moderate
232.8Moderate
242.8Moderate
252.7Moderate
262.7Moderate
272.6Moderate
282.6Moderate
292.5Moderate
302.5Moderate
Planning a trip in September

Is September a good time to visit Swanscombe?

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

5.9
Sightseeing
4th-best month of the year
2.2
Beach & pool
4th-best month of the year

September is a reasonable time to visit Swanscombe for sightseeing.

What to pack for Swanscombe in September

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

In September, Swanscombe sees daytime highs around 18°C and nights near 12°C. Worth packing: rain gear. About 9 days see rain.

rain gear

Sea temperature near Swanscombe 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 57 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
Jun15Bracing
Jul17Cool
Aug18Cool
Sep17Cool
Oct15Bracing
Nov12Bracing
Dec9Bracing

UV index in Swanscombe 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 Swanscombe peaks around August 10 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 10UV 6Jan 1UV 1
UV index (midday)Level
Jan1Low
Feb1Low
Mar3Moderate
Apr3Moderate
May6High
Jun6High
Jul6High
Aug6High
Sep4Moderate
Oct2Moderate
Nov1Low
Dec1Low
Location & terrain

Where is Swanscombe?

Swanscombe sits at 51.4°N, 0.3°E, 30 m above sea level, in United Kingdom. The nearest listed city is Grays, 3.0 km away.

Topography around Swanscombe

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

Within 3 km, the terrain around Swanscombe has only modest variations in elevation — a maximum elevation change of 98 m around an average of 17 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 249 m; within 80 km, significant variations in elevation — a maximum elevation change of 303 m.

The land around Swanscombe is covered by artificial surfaces (32%), water (24%) and trees (20%) within 3 km, grassland (27%), trees (26%) and cropland (20%) within 16 km, and cropland (26%), grassland (25%) and trees (23%) within 80 km.

3 km
98 m
16 km
249 m
80 km
303 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Grays 3.0 km · Gravesend 4.0 km · Longfield 6.0 km · Dartford 7.0 km · Hartley 7.0 km · South Ockendon 7.0 km · Swanley 11 km · Bexley 11 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 Swanscombe (51.4471°, 0.3103°, elevation 30 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).