Thetford weather in September

In September, Thetford sees average daytime highs of 18°C and overnight lows near 11°C, with 54 mm of rain across 9.7 wet days and about 12.4 hours of daylight. It is the 4th-warmest and 7th-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 13% 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 Thetford's 5th-clearest and 9th-windiest month. For the whole year in context, see Thetford's year-round climate.

Daytime high
18°
4th warmest
Overnight low
11°
9th coldest
Rainfall
54 mm
9.7 wet days
Daylight
12 h 24 min
5:39 AM – 6:03 PM
Cloud cover
70%
5th clearest
Wind
14 km/h
9th windiest
Solar energy
3 kWh/m²
Travel score
5.6
out of 10

Thetford is town in Norfolk, England.

Density
840/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 Thetford 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)
12012
21912
31912
41912
51912
61912
71912
81911
91911
101911
111911
121811
131811
141811
151811
161811
171811
181811
191811
201811
211711
221711
231710
241710
251710
261710
271710
281710
291710
301610

How September really feels in Thetford

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.

Thetford weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 7th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 51120.980.8
Feb / 41101.39.51.0
Mar10° / 4510.50.811.52.1
Apr13° / 4810.7013.63.4
May16° / 5410.4015.44.8
Jun19° / 11°6211.1016.55.7
Jul21° / 13°6011.9016.16.1
Aug21° / 13°6511.2014.56.1
Sep18° / 11°549.7012.45.6
Oct14° / 5911.1010.34.0
Nov10° / 5411.10.28.52.2
Dec / 5411.10.97.51.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 13% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 19% of September, with mostly cloudy or overcast conditions the remaining 68%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
13565
23664
33664
43664
53664
63664
73664
83565
93565
103565
113367
123367
133268
143268
153169
163169
173169
183169
193169
203070
212971
222971
232971
242971
252971
262971
272971
282971
293070
303070

Chance of precipitation in September

Any precipitation

Thetford gets around 54 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 37% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%50%151015202530
Rain chance (%)
131
230
330
430
530
630
730
831
931
1032
1132
1232
1332
1433
1533
1633
1733
1834
1934
2034
2134
2234
2335
2435
2535
2636
2736
2836
2936
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 75% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
167294
268284
369274
469274
570264
670264
771254
871254
972244
1073234
1173234
1274224
1375214
1475214
1577203
1677203
1777203
1878202
1978202
2078202
2179201
2279201
2379201
2479201
2579201
2681190
2781190
2882180
2983170
3084160

Wind in September

Winds average 14 km/h in September.

Across September, daily wind ranges from about 14 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
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
1715light breeze
1815light breeze
1915light breeze
2015light breeze
2115light breeze
2215light breeze
2315light breeze
2415light breeze
2515light breeze
2615light breeze
2715light breeze
2815light 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 5:14 AM to 6:04 AM, and sunset from 6:40 PM to 5:29 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.45:146:40
213.45:156:37
313.35:176:35
413.25:196:33
513.25:206:30
613.15:226:28
713.05:246:25
813.05:266:23
912.95:276:21
1012.85:296:18
1112.75:316:16
1212.75:326:13
1312.65:346:11
1412.55:366:08
1512.55:386:06
1612.45:396:03
1712.35:416:01
1812.35:435:58
1912.25:445:56
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
2711.65:585:36
2811.66:005:34
2911.56:025:31
3011.46:045:29

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3 kWh/m².

For context, solar energy here swings from a low near 0.6 kWh/m² to a high of 5.3 kWh/m² in June across the year — September's 3 kWh/m² falls in the middle.

01234151015202530
Solar energy (kWh/m²)Level
13.6Moderate
23.6Moderate
33.5Moderate
43.5Moderate
53.5Moderate
63.4Moderate
73.4Moderate
83.3Moderate
93.3Moderate
103.2Moderate
113.2Moderate
123.1Moderate
133.1Moderate
143.1Moderate
153.0Moderate
163.0Moderate
172.9Moderate
182.9Moderate
192.8Moderate
202.8Moderate
212.8Moderate
222.7Moderate
232.7Moderate
242.6Moderate
252.6Moderate
262.5Moderate
272.5Moderate
282.5Moderate
292.4Moderate
302.4Moderate
Planning a trip in September

Is September a good time to visit Thetford?

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

5.6
Sightseeing
4th-best month of the year
1.9
Beach & pool
4th-best month of the year

September is a reasonable time to visit Thetford for sightseeing.

What to pack for Thetford in September

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

In September, Thetford 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 Thetford in September

The nearest coast averages about 16°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 5°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
Jan6Bracing
Feb5Bracing
Mar6Bracing
Apr8Bracing
May11Bracing
Jun14Bracing
Jul17Cool
Aug18Cool
Sep16Cool
Oct13Bracing
Nov10Bracing
Dec7Bracing

UV index in Thetford 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 Thetford 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 December 21 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 6Dec 21UV 1
UV index (midday)Level
Jan1Low
Feb1Low
Mar3Moderate
Apr3Moderate
May6High
Jun6High
Jul6High
Aug6High
Sep4Moderate
Oct2Moderate
Nov1Low
Dec1Low
Location & terrain

Where is Thetford?

Thetford sits at 52.4°N, 0.8°E, 24 m above sea level, in United Kingdom. The nearest listed city is Bury St Edmunds, 19 km away.

Topography around Thetford

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

Within 3 km, the terrain around Thetford has only modest variations in elevation — a maximum elevation change of 59 m around an average of 29 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 81 m; within 80 km, only modest variations in elevation — a maximum elevation change of 190 m.

The land around Thetford is covered by trees (38%), grassland (27%) and cropland (20%) within 3 km, cropland (37%), trees (34%) and grassland (25%) within 16 km, and cropland (52%) and water (20%) within 80 km.

3 km
59 m
16 km
81 m
80 km
190 m
treesgrasslandcroplandartificial surfaceswaterwetland
September weather nearby: Bury St Edmunds 19 km · Newmarket 30 km · Stowmarket 30 km · East Dereham 32 km · Ely 33 km · Bowthorpe 40 km · Sudbury 42 km · Haverhill 43 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 Thetford (52.4167°, 0.75°, elevation 24 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).