Sint-Truiden weather in September

In September, Sint-Truiden sees average daytime highs of 19°C and overnight lows near 11°C, with 60 mm of rain across 10.6 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 20°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 Sint-Truiden's 3rd-clearest and 8th-windiest month. For the whole year in context, see Sint-Truiden's year-round climate.

Daytime high
19°
4th warmest
Overnight low
11°
9th coldest
Rainfall
60 mm
10.6 wet days
Daylight
12 h 24 min
6:22 AM – 6:45 PM
Cloud cover
66%
3rd clearest
Wind
13 km/h
8th windiest
Solar energy
3.15 kWh/m²
Travel score
5.8
out of 10

Sint-Truiden is town in Sint-Truiden municipality, Belgium.

Founded
~601 CE

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 Sint-Truiden 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 4°C cooler than August and about 4°C warmer than October.

10°15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
12112
22012
32012
42012
52012
62012
72012
82012
92012
102011
112011
121911
131911
141911
151911
161911
171911
181911
191911
201811
211810
221810
231810
241810
251810
261810
271710
281710
291710
301710

How September really feels in Sint-Truiden

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.

Sint-Truiden 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 / 6612.41.68.20.2
Feb / 6011.42.59.70.6
Mar10° / 6112.61.111.52.2
Apr14° / 5111.30.113.53.9
May18° / 6412.7015.25.3
Jun21° / 12°7412.5016.25.8
Jul23° / 14°7813.2015.86.2
Aug23° / 14°8012.5014.36.3
Sep19° / 11°6010.6012.45.8
Oct14° / 6211.7010.44.0
Nov / 6612.60.58.71.8
Dec / 7913.72.17.80.4

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 15% of September, with mostly cloudy or overcast conditions the remaining 65%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
13565
23565
33664
43664
53664
63763
73664
83664
93664
103565
113565
123565
133565
143763
153763
163664
173664
183664
193565
203565
213565
223664
233565
243466
253367
263268
273268
283169
292971
302872

Chance of precipitation in September

Any precipitation

Sint-Truiden gets around 60 mm of rain over 10.6 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 36% and peaks near 41% on the wettest days.

0%10%20%30%40%50%151015202530
Rain chance (%)
135
235
335
434
534
634
735
835
935
1035
1136
1236
1336
1436
1536
1636
1736
1836
1936
2036
2136
2236
2337
2437
2538
2638
2739
2840
2940
3041

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 (%)Muggy (%)
16227101
2642691
3642691
4662581
5672580
6672580
7692470
8692470
9702370
10712270
11722260
12732160
13742060
14761950
15771850
16781840
17791740
18801730
19811630
20811630
21821620
22821620
23831610
24831610
25821710
26821710
27821710
28821710
29831700
30831700

Wind in September

Winds average 13 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.

05101520151015202530
Wind speed (km/h)Feels
112light breeze
212light breeze
312light breeze
412light breeze
512light breeze
613light breeze
713light breeze
813light breeze
913light breeze
1013light breeze
1113light breeze
1213light breeze
1313light breeze
1413light breeze
1513light breeze
1613light breeze
1713light breeze
1813light breeze
1913light 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 5:58 AM to 6:45 AM, and sunset from 7:20 PM to 6:12 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.45:587:20
213.36:007:17
313.26:017:15
413.26:037:13
513.16:057:11
613.06:067:08
713.06:087:06
812.96:097:04
912.86:117:01
1012.86:136:59
1112.76:146:57
1212.66:166:54
1312.66:176:52
1412.56:196:50
1512.46:216:47
1612.46:226:45
1712.36:246:43
1812.26:256:40
1912.26:276:38
2012.16:296:36
2112.06:306:33
2212.06:326:31
2311.96:336:29
2411.96:356:26
2511.86:376:24
2611.76:386:22
2711.76:406:19
2811.66:426:17
2911.56:436:15
3011.56:456:12

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.15 kWh/m².

For context, solar energy here swings from a low near 0.64 kWh/m² to a high of 5.32 kWh/m² in June across the year — September's 3.15 kWh/m² falls in the middle.

01234151015202530
Solar energy (kWh/m²)Level
13.7Moderate
23.7Moderate
33.6Moderate
43.6Moderate
53.5Moderate
63.5Moderate
73.5Moderate
83.4Moderate
93.4Moderate
103.4Moderate
113.3Moderate
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
262.6Moderate
272.6Moderate
282.5Moderate
292.5Moderate
302.4Moderate
Planning a trip in September

Is September a good time to visit Sint-Truiden?

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
2.4
Beach & pool
4th-best month of the year

September is a reasonable time to visit Sint-Truiden for sightseeing.

What to pack for Sint-Truiden in September

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

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

rain gear

UV index in Sint-Truiden 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 Sint-Truiden peaks around July 13 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 7 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighModerateLowJul 13UV 6Jan 1UV 1
UV index (midday)Level
Jan1Low
Feb1Low
Mar3Moderate
Apr4Moderate
May6High
Jun6High
Jul7High
Aug6High
Sep4Moderate
Oct2Moderate
Nov1Low
Dec1Low

Air quality in Sint-Truiden 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 Sint-Truiden is worst in April — around 16 µg/m³ PM2.5 (moderate), and holds fairly steady the rest of the year.

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

01020JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodApr 1216 µg/m³Dec 1311 µg/m³
PM2.5 (µg/m³)Level
Jan12Good
Feb12Moderate
Mar16Moderate
Apr16Moderate
May15Moderate
Jun14Moderate
Jul13Moderate
Aug14Moderate
Sep13Moderate
Oct12Good
Nov11Good
Dec11Good
Location & terrain

Where is Sint-Truiden?

Sint-Truiden sits at 50.8°N, 5.2°E, 54 m above sea level, in Belgium. The nearest listed city is Hasselt, 17 km away.

HasseltTienenDiepenbeekTongerenDiestZonhovenBilzenZolder

Topography around Sint-Truiden

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

Within 3 km, the terrain around Sint-Truiden has only modest variations in elevation — a maximum elevation change of 51 m around an average of 51 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 138 m; within 80 km, large variations in elevation — a maximum elevation change of 774 m.

The land around Sint-Truiden is covered by grassland (27%), artificial surfaces (27%) and cropland (23%) within 3 km, cropland (40%), grassland (28%) and trees (21%) within 16 km, and trees (38%), cropland (27%) and grassland (24%) within 80 km.

3 km
51 m
16 km
138 m
80 km
774 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Hasselt 17 km · Tienen 18 km · Diepenbeek 19 km · Tongeren 20 km · Diest 21 km · Zonhoven 23 km · Bilzen 24 km · Zolder 25 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 Sint-Truiden (50.8168°, 5.1865°, elevation 54 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).