Sudbury weather in September

In September, Sudbury sees average daytime highs of 18°C and overnight lows near 11°C, with 48 mm of rain across 9.2 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 15% 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 Sudbury's 5th-clearest and 9th-windiest month. For the whole year in context, see Sudbury's year-round climate.

Daytime high
18°
4th warmest
Overnight low
11°
10th coldest
Rainfall
48 mm
9.2 wet days
Daylight
12 h 24 min
5:40 AM – 6:03 PM
Cloud cover
69%
5th clearest
Wind
15 km/h
9th windiest
Solar energy
3.11 kWh/m²
Travel score
5.8
out of 10

Sudbury is town in Babergh, Suffolk, England.

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 Sudbury 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 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
22012
32012
41912
51912
61912
71912
81912
91912
101912
111912
121912
131912
141812
151811
161811
171811
181811
191811
201811
211811
221811
231711
241711
251711
261711
271711
281711
291710
301710

How September really feels in Sudbury

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.

Sudbury 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 / 5011.318.10.9
Feb / 419.41.29.61.0
Mar10° / 409.90.611.52.1
Apr13° / 4511013.63.3
May16° / 5210.2015.44.7
Jun19° / 11°5611016.45.7
Jul21° / 14°5611.70166.2
Aug21° / 14°6110.5014.46.3
Sep18° / 11°489.2012.45.8
Oct14° / 5710.6010.44.1
Nov10° / 5510.20.18.52.3
Dec / 5410.80.97.61.1

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 15% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 20% of September, with mostly cloudy or overcast conditions the remaining 65%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
13664
23664
33763
43763
53862
63862
73862
83862
93862
103862
113763
123763
133664
143664
153565
163664
173565
183466
193367
203367
213367
223367
233367
243367
253268
263268
273268
283367
293268
303268

Chance of precipitation in September

Any precipitation

Sudbury gets around 48 mm of rain over 9.2 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 31% and peaks near 37% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%50%151015202530
Rain chance (%)
129
228
328
428
528
628
728
829
929
1029
1129
1229
1329
1429
1529
1630
1730
1830
1931
2032
2132
2233
2333
2434
2534
2635
2736
2836
2937
3037

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 73% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
165305
265305
366295
466295
567285
667285
768275
868275
969265
1069265
1170255
1271245
1371245
1473234
1573234
1673234
1775223
1875223
1976222
2076222
2175232
2276231
2377221
2477221
2577221
2679210
2780200
2880200
2981190
3082180

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
1016light breeze
1116light breeze
1216light breeze
1316light breeze
1416light breeze
1516light breeze
1616light breeze
1716light breeze
1816light breeze
1916light breeze
2016light breeze
2116light breeze
2216light breeze
2316light breeze
2416light 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 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 5:14 AM to 6:03 AM, and sunset from 6:39 PM to 5:29 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.45:146:39
213.45:166:37
313.35:186:35
413.25:196:32
513.15:216:30
613.15:236:27
713.05:246:25
812.95:266:23
912.95:286:20
1012.85:296:18
1112.75:316:15
1212.75:336:13
1312.65:346:11
1412.55:366:08
1512.55:386:06
1612.45:406:03
1712.35:416:01
1812.35:435:58
1912.25:455:56
2012.15:465:54
2112.15:485:51
2212.05:505:49
2311.95:515:46
2411.85:535:44
2511.85:555:41
2611.75:575:39
2711.65:585:37
2811.66:005:34
2911.56:025:32
3011.46:035:29

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.11 kWh/m².

For context, solar energy here swings from a low near 0.63 kWh/m² to a high of 5.42 kWh/m² in June across the year — September's 3.11 kWh/m² falls in the middle.

01234151015202530
Solar energy (kWh/m²)Level
13.7Moderate
23.7Moderate
33.6Moderate
43.6Moderate
53.6Moderate
63.5Moderate
73.5Moderate
83.4Moderate
93.4Moderate
103.4Moderate
113.3Moderate
123.3Moderate
133.2Moderate
143.2Moderate
153.1Moderate
163.1Moderate
173.0Moderate
183.0Moderate
192.9Moderate
202.9Moderate
212.9Moderate
222.8Moderate
232.8Moderate
242.7Moderate
252.7Moderate
262.6Moderate
272.6Moderate
282.5Moderate
292.5Moderate
302.5Moderate
Planning a trip in September

Is September a good time to visit Sudbury?

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

5.8
Sightseeing
3rd-best month of the year
2.1
Beach & pool
4th-best month of the year

September is a reasonable time to visit Sudbury for sightseeing.

What to pack for Sudbury in September

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

In September, Sudbury sees daytime highs around 18°C and nights near 11°C. Worth packing: rain gear. About 9 days see rain.

rain gear

Sea temperature near Sudbury 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 48 km away) is warmest in August at about 18°C and coldest in February near 6°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
Jan7Bracing
Feb6Bracing
Mar7Bracing
Apr9Bracing
May12Bracing
Jun15Bracing
Jul17Cool
Aug18Cool
Sep17Cool
Oct15Bracing
Nov12Bracing
Dec9Bracing

UV index in Sudbury 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 Sudbury peaks around June 23 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.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighModerateLowJun 23UV 6Jan 1UV 1
UV index (midday)Level
Jan1Low
Feb1Low
Mar3Moderate
Apr3Moderate
May6High
Jun6High
Jul6High
Aug6High
Sep4Moderate
Oct2Moderate
Nov1Low
Dec1Low
Location & terrain

Where is Sudbury?

Sudbury sits at 52.0°N, 0.7°E, 36 m above sea level, in United Kingdom. The nearest listed city is Colchester, 20 km away.

Topography around Sudbury

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

Within 3 km, the terrain around Sudbury has only modest variations in elevation — a maximum elevation change of 83 m around an average of 49 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 123 m; within 80 km, only modest variations in elevation — a maximum elevation change of 217 m.

The land around Sudbury is covered by cropland (44%), grassland (23%) and trees (22%) within 3 km, cropland (62%) and grassland (20%) within 16 km, and cropland (45%) and water (20%) within 80 km.

3 km
83 m
16 km
123 m
80 km
217 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Colchester 20 km · Haverhill 21 km · Braintree 22 km · Bury St Edmunds 23 km · Stowmarket 25 km · Witham 27 km · Ipswich 29 km · Newmarket 32 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 Sudbury (52.0389°, 0.7312°, elevation 36 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).