Duffel weather in September

In September, Duffel sees average daytime highs of 19°C and overnight lows near 11°C, with 52 mm of rain across 10.2 wet days and about 12.4 hours of daylight. It is the 4th-warmest and 11th-wettest month of the year here.

Highs ease over the month, from about 21°C in the first days to 18°C by the end. The sky is clear or mostly clear about 18% 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 Duffel's 3rd-clearest and 9th-windiest month. For the whole year in context, see Duffel's year-round climate.

Daytime high
19°
4th warmest
Overnight low
11°
9th coldest
Rainfall
52 mm
10.2 wet days
Daylight
12 h 24 min
6:25 AM – 6:48 PM
Cloud cover
66%
3rd clearest
Wind
12 km/h
9th windiest
Solar energy
3.12 kWh/m²
Travel score
6.0
out of 10

Duffel is town in Duffel municipality, Belgium.

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 21°C in the first days to 18°C by the end.

A typical September day in Duffel reaches about 19°C in the afternoon and slips back to 11°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 15°C and 24°C. Set against its neighbours, September runs about 3°C cooler than August and about 4°C warmer than October.

10°15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
12113
22113
32113
42112
52112
62012
72012
82012
92012
102012
112012
122012
132012
142012
151911
161911
171911
181911
191911
201911
211911
221911
231811
241811
251811
261811
271811
281810
291810
301710

How September really feels in Duffel

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.

Duffel weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 11th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 6111.60.98.20.5
Feb / 5510.91.49.60.8
Mar11° / 5311.40.711.52.4
Apr15° / 4510.9013.54.1
May18° / 5911.7015.35.5
Jun21° / 12°6511.4016.26.0
Jul23° / 14°7112.3015.96.4
Aug23° / 14°7212014.46.4
Sep19° / 11°5210.2012.46.0
Oct15° / 5711010.44.2
Nov10° / 6011.70.38.72.0
Dec / 7012.91.27.80.7

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 18% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 17% of September, with mostly cloudy or overcast conditions the remaining 64%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
13565
23565
33565
43565
53664
63565
73565
83664
93664
103664
113763
123664
133664
143862
153862
163862
173862
183961
193961
203862
213763
223763
233763
243664
253565
263565
273466
283268
293070
303070

Chance of precipitation in September

Any precipitation

Duffel gets around 52 mm of rain over 10.2 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 35% and peaks near 37% on the wettest days.

0%10%20%30%40%50%151015202530
Rain chance (%)
135
234
334
434
534
634
734
834
934
1034
1134
1234
1334
1434
1534
1634
1734
1834
1934
2034
2134
2235
2335
2435
2535
2636
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 71% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
15731111
25830111
35929111
46128101
56128101
66227101
76327100
86426100
9662590
10662590
11672490
12692380
13702280
14712270
15732160
16742060
17752050
18761950
19771940
20781930
21781930
22782020
23782020
24782020
25792010
26792010
27792010
28792010
29801910
30801910

Wind in September

Winds average 12 km/h in September.

Across September, daily wind ranges from about 12 km/h on the calmest days to 13 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
112light breeze
212light breeze
312light breeze
412light breeze
512light breeze
612light breeze
712light breeze
812light breeze
912light breeze
1012light breeze
1112light breeze
1212light breeze
1312light breeze
1412light breeze
1512light breeze
1612light breeze
1712light breeze
1812light breeze
1912light breeze
2013light breeze
2113light breeze
2213light breeze
2313light breeze
2413light breeze
2513light breeze
2613light breeze
2713light breeze
2813light breeze
2913light breeze
3013light 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 6:01 AM to 6:48 AM, and sunset from 7:23 PM to 6:15 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.46:017:23
213.36:027:21
313.26:047:18
413.26:057:16
513.16:077:14
613.06:097:11
713.06:107:09
812.96:127:07
912.86:137:04
1012.86:157:02
1112.76:177:00
1212.66:186:57
1312.66:206:55
1412.56:226:53
1512.46:236:50
1612.46:256:48
1712.36:266:45
1812.26:286:43
1912.26:306:41
2012.16:316:38
2112.06:336:36
2212.06:356:34
2311.96:366:31
2411.96:386:29
2511.86:396:26
2611.76:416:24
2711.76:436:22
2811.66:446:19
2911.56:466:17
3011.56:486:15

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.12 kWh/m².

For context, solar energy here swings from a low near 0.63 kWh/m² to a high of 5.29 kWh/m² in June across the year — September's 3.12 kWh/m² falls in the middle.

01234151015202530
Solar energy (kWh/m²)Level
13.7Moderate
23.6Moderate
33.6Moderate
43.6Moderate
53.5Moderate
63.5Moderate
73.4Moderate
83.4Moderate
93.4Moderate
103.3Moderate
113.3Moderate
123.3Moderate
133.2Moderate
143.2Moderate
153.1Moderate
163.1Moderate
173.1Moderate
183.0Moderate
193.0Moderate
202.9Moderate
212.9Moderate
222.8Moderate
232.8Moderate
242.7Moderate
252.7Moderate
262.6Moderate
272.6Moderate
282.5Moderate
292.5Moderate
302.4Moderate
Planning a trip in September

Is September a good time to visit Duffel?

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

6.0
Sightseeing
3rd-best month of the year
2.7
Beach & pool
4th-best month of the year

September is a reasonable time to visit Duffel for sightseeing.

What to pack for Duffel in September

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

In September, Duffel sees daytime highs around 19°C and nights near 11°C. Worth packing: rain gear. About 10 days see rain.

rain gear

UV index in Duffel 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 Duffel 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
Apr4Moderate
May6High
Jun6High
Jul6High
Aug6High
Sep4Moderate
Oct2Moderate
Nov1Low
Dec1Low

Air quality in Duffel in September

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where September falls, not just the annual average.

Air quality in Duffel is worst in April — around 18 µg/m³ PM2.5 (moderate), and holds fairly steady the rest of the year.

Modeled monthly averages (CAMS reanalysis, 2015–2024).

01020JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodApr 1317 µg/m³Dec 1511 µg/m³
PM2.5 (µg/m³)Level
Jan13Moderate
Feb13Moderate
Mar17Moderate
Apr18Moderate
May16Moderate
Jun15Moderate
Jul14Moderate
Aug15Moderate
Sep15Moderate
Oct13Moderate
Nov12Moderate
Dec11Good
Location & terrain

Where is Duffel?

Duffel sits at 51.1°N, 4.5°E, 5 m above sea level, in Belgium. The nearest listed city is Sint-Katelijne-Waver, 4.0 km away.

Topography around Duffel

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

Within 3 km, the terrain around Duffel has only modest variations in elevation — a maximum elevation change of 25 m around an average of 8 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 74 m; within 80 km, significant variations in elevation — a maximum elevation change of 375 m.

The land around Duffel is covered by grassland (44%), trees (25%) and artificial surfaces (20%) within 3 km, trees (32%), grassland (31%) and artificial surfaces (23%) within 16 km, and cropland (34%), trees (25%) and grassland (24%) within 80 km.

3 km
25 m
16 km
74 m
80 km
375 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Sint-Katelijne-Waver 4.0 km · Lier 6.0 km · Kontich 6.0 km · Mechelen 8.0 km · Edegem 8.0 km · Mortsel 9.0 km · Boom 10 km · Putte 10 km

Belgium travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type C / E
230 V · 50 Hz
Prices
≈ 81% of US
price level, 2025
GDP per capita
$60,750
2025
Happiness
6.9 / 10
World Happiness, 2025
Safe drinking water
100%
of population, 2024
Homicide rate
1.1
per 100k, 2021
Road deaths
5.8
per 100k/yr, 2019
Income group
High
World Bank
English
Very high
EF EPI 608
Religion
Roman Catholic 57%nonbeliever/agnostic 20%atheist 9%Muslim 7%

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 Duffel (51.0955°, 4.509°, elevation 5 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. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).