Flémalle-Haute weather in September

In September, Flémalle-Haute sees average daytime highs of 18°C and overnight lows near 10°C, with 67 mm of rain across 11.6 wet days and about 12.4 hours of daylight. It is the 4th-warmest and 10th-wettest month of the year here.

Highs ease over the month, from about 20°C in the first days to 16°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 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 Flémalle-Haute's 3rd-clearest and 8th-windiest month. For the whole year in context, see Flémalle-Haute's year-round climate.

Daytime high
18°
4th warmest
Overnight low
10°
9th coldest
Rainfall
67 mm
11.6 wet days
Daylight
12 h 24 min
6:21 AM – 6:44 PM
Cloud cover
66%
3rd clearest
Wind
13 km/h
8th windiest
Solar energy
3.14 kWh/m²
Travel score
5.5
out of 10

Flémalle-Haute is section of Flémalle, 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 20°C in the first days to 16°C by the end.

A typical September day in Flémalle-Haute reaches about 18°C in the afternoon and slips back to 10°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 14°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)
12012
22012
32011
42011
51911
61911
71911
81911
91911
101911
111911
121911
131911
141811
151810
161810
171810
181810
191810
201810
211810
221710
231710
241710
251710
261710
27179
28179
29169
30169

How September really feels in Flémalle-Haute

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.

Flémalle-Haute weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 10th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 8113.92.88.30.0
Feb / 7212.33.89.70.3
Mar10° / 7314.12.111.51.9
Apr13° / 5812.10.313.53.6
May17° / 6713015.25.0
Jun20° / 11°7512.8016.25.7
Jul22° / 13°7913.1015.86.2
Aug22° / 13°8112.7014.36.2
Sep18° / 10°6711.6012.45.5
Oct14° / 6712.4010.43.6
Nov / 7413.71.28.71.4
Dec / 9315.23.47.80.2

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 13% of September, with mostly cloudy or overcast conditions the remaining 67%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
13565
23565
33565
43466
53466
63466
73565
83466
93466
103367
113466
123466
133367
143466
153466
163466
173367
183367
193367
203466
213367
223367
233367
243268
253268
263169
272971
282773
292773
302773

Chance of precipitation in September

Any precipitation

Flémalle-Haute gets around 67 mm of rain over 11.6 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 40% and peaks near 44% on the wettest days.

0%10%20%30%40%50%151015202530
Rain chance (%)
139
239
339
439
539
639
739
839
939
1039
1139
1239
1339
1439
1538
1638
1738
1838
1938
2038
2139
2239
2339
2440
2540
2641
2742
2843
2944
3044

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 80% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
1652771
2672760
3682660
4702550
5702550
6712450
7722440
8732340
9742240
10752140
11762040
12771940
13791830
14801730
15811630
16821530
17831430
18851320
19851320
20861220
21861220
22871210
23871210
24871210
25871210
26871210
27871210
28881200
29871300
30881200

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 14 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202530
Wind speed (km/h)Feels
112light breeze
212light breeze
313light breeze
413light breeze
513light 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
2814light breeze
2914light breeze
3014light 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 5:58 AM to 6:44 AM, and sunset from 7:18 PM to 6:11 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.35:587:18
213.35:597:16
313.26:017:14
413.26:027:12
513.16:047:09
613.06:057:07
713.06:077:05
812.96:097:02
912.86:107:00
1012.86:126:58
1112.76:136:55
1212.66:156:53
1312.66:166:51
1412.56:186:48
1512.46:206:46
1612.46:216:44
1712.36:236:42
1812.26:246:39
1912.26:266:37
2012.16:286:34
2112.06:296:32
2212.06:316:30
2311.96:326:28
2411.96:346:25
2511.86:366:23
2611.76:376:21
2711.76:396:18
2811.66:406:16
2911.56:426:14
3011.56:446:11

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.14 kWh/m².

For context, solar energy here swings from a low near 0.64 kWh/m² to a high of 5.31 kWh/m² in June across the year — September's 3.14 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
133.2Moderate
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 Flémalle-Haute?

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

5.5
Sightseeing
4th-best month of the year
1.9
Beach & pool
4th-best month of the year

September is a reasonable time to visit Flémalle-Haute for sightseeing.

What to pack for Flémalle-Haute in September

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

In September, Flémalle-Haute sees daytime highs around 18°C and nights near 10°C. Worth packing: rain gear. About 12 days see rain.

rain gear

UV index in Flémalle-Haute 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 Flémalle-Haute peaks around July 15 at about 7 (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 15UV 7Jan 1UV 1
UV index (midday)Level
Jan1Low
Feb1Low
Mar3Moderate
Apr4Moderate
May6High
Jun6High
Jul7High
Aug6High
Sep4Moderate
Oct3Moderate
Nov1Low
Dec1Low

Air quality in Flémalle-Haute 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 Flémalle-Haute is worst in April — around 18 µg/m³ PM2.5 (moderate), about 1.7× the cleanest month (December, 11 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodApr 1218 µg/m³Dec 1011 µg/m³
PM2.5 (µg/m³)Level
Jan14Moderate
Feb13Moderate
Mar17Moderate
Apr18Moderate
May15Moderate
Jun15Moderate
Jul13Moderate
Aug14Moderate
Sep14Moderate
Oct12Good
Nov11Good
Dec11Good
Location & terrain

Where is Flémalle-Haute?

Flémalle-Haute sits at 50.6°N, 5.4°E, 175 m above sea level, in Belgium. The nearest listed city is Seraing, 4.0 km away.

Fléron

Topography around Flémalle-Haute

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

Within 3 km, the terrain around Flémalle-Haute has only modest variations in elevation — a maximum elevation change of 183 m around an average of 135 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 278 m; within 80 km, large variations in elevation — a maximum elevation change of 754 m.

The land around Flémalle-Haute is covered by trees (50%) and artificial surfaces (22%) within 3 km, trees (35%) and cropland (35%) within 16 km, and trees (43%), grassland (26%) and cropland (24%) within 80 km.

3 km
183 m
16 km
278 m
80 km
754 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Seraing 4.0 km · Saint-Nicolas 7.0 km · Ans 9.0 km · Liège 9.0 km · Grivegnée 12 km · Chaudfontaine 14 km · Herstal 14 km · Fléron 17 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 Flémalle-Haute (50.5999°, 5.4447°, elevation 175 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).