Hasselt weather in September

In September, Hasselt sees average daytime highs of 19°C and overnight lows near 11°C, with 58 mm of rain across 10.5 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 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 Hasselt's 3rd-clearest and 8th-windiest month. For the whole year in context, see Hasselt's year-round climate.

Daytime high
19°
4th warmest
Overnight low
11°
9th coldest
Rainfall
58 mm
10.5 wet days
Daylight
12 h 24 min
6:22 AM – 6:44 PM
Cloud cover
66%
3rd clearest
Wind
12 km/h
8th windiest
Solar energy
3.1 kWh/m²
Travel score
5.9
out of 10

Hasselt is town in Hasselt municipality, Belgium.

Air quality
Moderate
PM2.5 13 µg/m³ · 2016

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 Hasselt 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 25°C. Set against its neighbours, September runs about 4°C cooler than August and about 5°C warmer than October.

10°15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
12113
22112
32112
42112
52112
62012
72012
82012
92012
102012
112012
122012
132011
142011
151911
161911
171911
181911
191911
201911
211911
221911
231811
241811
251810
261810
271810
281810
291710
301710

How September really feels in Hasselt

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.

Hasselt 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 / 6612.11.28.20.3
Feb / 6011.31.89.70.7
Mar11° / 6012.50.911.52.3
Apr15° / 4810.9013.54.2
May18° / 6012.1015.35.5
Jun21° / 12°6912.4016.25.9
Jul23° / 14°7512.7015.86.4
Aug23° / 14°7512.2014.36.4
Sep19° / 11°5810.5012.45.9
Oct15° / 6111.3010.44.1
Nov10° / 6412.10.38.71.9
Dec / 7713.61.77.80.6

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 17% of September, with mostly cloudy or overcast conditions the remaining 64%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
13565
23565
33565
43763
53763
63664
73664
83664
93763
103763
113763
123763
133763
143862
153862
163862
173862
183763
193961
203862
213862
223664
233664
243565
253565
263466
273268
283268
293169
303070

Chance of precipitation in September

Any precipitation

Hasselt gets around 58 mm of rain over 10.5 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 40% on the wettest days.

0%10%20%30%40%50%151015202530
Rain chance (%)
134
234
334
434
534
634
734
834
934
1034
1135
1235
1335
1435
1535
1635
1736
1836
1936
2036
2136
2236
2337
2437
2537
2638
2739
2839
2940
3040

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 (%)Muggy (%)
15929111
26029101
36228100
46327100
5642790
6652690
7662590
8662590
9672490
10692380
11702280
12712180
13732070
14741970
15751960
16761860
17771850
18781750
19791740
20801730
21801730
22791830
23801820
24801820
25801820
26811810
27801910
28801910
29801910
30811810

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
112calm
212calm
312calm
412calm
512calm
612calm
712calm
812calm
912calm
1012light breeze
1112light breeze
1212light breeze
1312light breeze
1412light breeze
1512light breeze
1612light breeze
1712light breeze
1812light breeze
1912light breeze
2012light breeze
2112light breeze
2212light breeze
2312light breeze
2412light breeze
2512light breeze
2612light breeze
2712light breeze
2812light 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 5:57 AM to 6:44 AM, and sunset from 7:19 PM to 6:12 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.45:577:19
213.35:597:17
313.26:017:15
413.26:027:12
513.16:047:10
613.06:057:08
713.06:077:05
812.96:097:03
912.86:107:01
1012.86:126:58
1112.76:146:56
1212.66:156:54
1312.66:176:51
1412.56:186:49
1512.46:206:47
1612.46:226:44
1712.36:236:42
1812.26:256:40
1912.26:266:37
2012.16:286:35
2112.06:306:33
2212.06:316:30
2311.96:336:28
2411.96:356:26
2511.86:366:23
2611.76:386:21
2711.76:396:19
2811.66:416:16
2911.56:436:14
3011.56:446:12

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.1 kWh/m².

For context, solar energy here swings from a low near 0.62 kWh/m² to a high of 5.25 kWh/m² in June across the year — September's 3.1 kWh/m² falls in the middle.

01234151015202530
Solar energy (kWh/m²)Level
13.6Moderate
23.6Moderate
33.6Moderate
43.5Moderate
53.5Moderate
63.5Moderate
73.4Moderate
83.4Moderate
93.4Moderate
103.3Moderate
113.3Moderate
123.2Moderate
133.2Moderate
143.2Moderate
153.1Moderate
163.1Moderate
173.0Moderate
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 Hasselt?

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

5.9
Sightseeing
3rd-best month of the year
2.7
Beach & pool
4th-best month of the year

September is a reasonable time to visit Hasselt for sightseeing.

What to pack for Hasselt in September

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

In September, Hasselt 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 Hasselt 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 Hasselt 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 Hasselt 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 Hasselt is worst in April — around 16 µg/m³ PM2.5 (moderate), and holds fairly steady the rest of the year.

Seasonal pattern from CAMS reanalysis, scaled to Hasselt's WHO annual average of 13 µg/m³.

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodApr 1216 µg/m³Dec 1310 µg/m³
PM2.5 (µg/m³)Level
Jan12Good
Feb12Moderate
Mar16Moderate
Apr16Moderate
May14Moderate
Jun14Moderate
Jul13Moderate
Aug14Moderate
Sep13Moderate
Oct11Good
Nov11Good
Dec10Good
Location & terrain

Where is Hasselt?

Hasselt sits at 50.9°N, 5.3°E, 42 m above sea level, in Belgium. The nearest listed city is Diepenbeek, 6.0 km away.

Topography around Hasselt

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

Within 3 km, the terrain around Hasselt has only modest variations in elevation — a maximum elevation change of 38 m around an average of 38 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 149 m; within 80 km, large variations in elevation — a maximum elevation change of 746 m.

The land around Hasselt is covered by artificial surfaces (44%), trees (27%) and grassland (23%) within 3 km, trees (40%) and grassland (29%) within 16 km, and trees (37%), cropland (28%) and grassland (24%) within 80 km.

3 km
38 m
16 km
149 m
80 km
746 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Diepenbeek 6.0 km · Zonhoven 7.0 km · Zolder 11 km · Houthalen 12 km · Genk 12 km · Heusden 12 km · Bilzen 14 km · Helchteren 14 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 Hasselt (50.9311°, 5.3378°, elevation 42 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).