Saint-Ghislain weather in September

In September, Saint-Ghislain sees average daytime highs of 19°C and overnight lows near 11°C, with 51 mm of rain across 9.9 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 18 min at the start of September to 11 h 30 min by month's end. Set against the rest of the year, September is Saint-Ghislain's 3rd-clearest and 9th-windiest month. For the whole year in context, see Saint-Ghislain's year-round climate.

Daytime high
19°
4th warmest
Overnight low
11°
9th coldest
Rainfall
51 mm
9.9 wet days
Daylight
12 h 24 min
6:28 AM – 6:50 PM
Cloud cover
66%
3rd clearest
Wind
13 km/h
9th windiest
Solar energy
3.19 kWh/m²
Travel score
6.0
out of 10

Saint-Ghislain is municipality section and town in Saint-Ghislain 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 Saint-Ghislain 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)
12112
22112
32112
42012
52012
62012
72012
82012
92012
102012
112012
122011
132011
141911
151911
161911
171911
181911
191911
201911
211911
221811
231811
241811
251810
261810
271810
281810
291710
301710

How September really feels in Saint-Ghislain

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.

Saint-Ghislain 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 / 6612.318.30.4
Feb / 5911.21.59.70.8
Mar11° / 5811.70.711.52.4
Apr14° / 4911.5013.54.0
May18° / 6512.3015.25.3
Jun21° / 12°6210.8016.16.1
Jul23° / 14°6611.2015.86.5
Aug23° / 14°6911.3014.36.5
Sep19° / 11°519.9012.46.0
Oct15° / 6011.1010.54.2
Nov10° / 6411.90.48.82.0
Dec / 7713.41.27.90.7

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 15% of September, with mostly cloudy or overcast conditions the remaining 67%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
13664
23664
33565
43664
53565
63565
73466
83565
93466
103367
113367
123367
133367
143268
153466
163367
173367
183367
193367
203367
213367
223367
233466
243367
253268
263268
273169
283169
293070
302971

Chance of precipitation in September

Any precipitation

Saint-Ghislain gets around 51 mm of rain over 9.9 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.

0%10%20%30%40%50%151015202530
Rain chance (%)
132
232
331
431
531
631
731
832
932
1032
1132
1232
1332
1432
1532
1632
1733
1833
1933
2033
2133
2234
2334
2434
2535
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 72% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
15830111
25929111
36128101
46327100
56327100
66426100
7652690
8662590
9662590
10672490
11692380
12702280
13722170
14722170
15742060
16751960
17761950
18771940
19781840
20791830
21791830
22791920
23791920
24791920
25801910
26801910
27801910
28801910
29801910
30801910

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
612light breeze
712light 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 18 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 108 minutes over September. Sunrise moves from 6:04 AM to 6:50 AM, and sunset from 7:25 PM to 6:18 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.36:047:25
213.36:067:22
313.26:077:20
413.16:097:18
513.16:117:16
613.06:127:13
713.06:147:11
812.96:157:09
912.86:177:06
1012.86:187:04
1112.76:207:02
1212.66:227:00
1312.66:236:57
1412.56:256:55
1512.46:266:53
1612.46:286:50
1712.36:296:48
1812.26:316:46
1912.26:336:43
2012.16:346:41
2112.06:366:39
2212.06:376:36
2311.96:396:34
2411.96:416:32
2511.86:426:29
2611.76:446:27
2711.76:456:25
2811.66:476:23
2911.56:496:20
3011.56:506:18

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.19 kWh/m².

For context, solar energy here swings from a low near 0.66 kWh/m² to a high of 5.34 kWh/m² in June across the year — September's 3.19 kWh/m² falls in the middle.

01234151015202530
Solar energy (kWh/m²)Level
13.7Moderate
23.7Moderate
33.7Moderate
43.6Moderate
53.6Moderate
63.5Moderate
73.5Moderate
83.5Moderate
93.4Moderate
103.4Moderate
113.4Moderate
123.3Moderate
133.3Moderate
143.3Moderate
153.2Moderate
163.2Moderate
173.1Moderate
183.1Moderate
193.1Moderate
203.0Moderate
213.0Moderate
222.9Moderate
232.9Moderate
242.8Moderate
252.8Moderate
262.7Moderate
272.7Moderate
282.6Moderate
292.5Moderate
302.5Moderate
Planning a trip in September

Is September a good time to visit Saint-Ghislain?

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

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

September is a reasonable time to visit Saint-Ghislain for sightseeing.

What to pack for Saint-Ghislain in September

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

In September, Saint-Ghislain 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 Saint-Ghislain 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 Saint-Ghislain peaks around July 13 at about 7 (high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near December 22 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 7Dec 22UV 1
UV index (midday)Level
Jan1Low
Feb1Low
Mar3Moderate
Apr4Moderate
May6High
Jun7High
Jul7High
Aug6High
Sep4Moderate
Oct3Moderate
Nov1Low
Dec1Low

Air quality in Saint-Ghislain 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 Saint-Ghislain is worst in April — around 16 µg/m³ PM2.5 (moderate), about 1.6× the cleanest month (December, 10 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateModerateGoodApr 1316 µg/m³Dec 1010 µg/m³
PM2.5 (µg/m³)Level
Jan12Good
Feb12Good
Mar15Moderate
Apr16Moderate
May14Moderate
Jun14Moderate
Jul12Good
Aug13Moderate
Sep12Moderate
Oct11Good
Nov10Good
Dec10Good
Location & terrain

Where is Saint-Ghislain?

Saint-Ghislain sits at 50.4°N, 3.8°E, 27 m above sea level, in Belgium. The nearest listed city is Boussu, 2.0 km away.

PéruwelzAth

Topography around Saint-Ghislain

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

Within 3 km, the terrain around Saint-Ghislain has only modest variations in elevation — a maximum elevation change of 80 m around an average of 29 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 170 m; within 80 km, significant variations in elevation — a maximum elevation change of 516 m.

The land around Saint-Ghislain is covered by trees (37%), grassland (28%) and artificial surfaces (24%) within 3 km, cropland (38%), trees (31%) and grassland (21%) within 16 km, and cropland (45%), trees (25%) and grassland (21%) within 80 km.

3 km
80 m
16 km
170 m
80 km
516 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Boussu 2.0 km · Quaregnon 3.0 km · Colfontaine 5.0 km · Dour 7.0 km · Frameries 7.0 km · Mons 9.0 km · Péruwelz 17 km · Ath 20 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 Saint-Ghislain (50.4482°, 3.8189°, elevation 27 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).