Jambes weather in September

In September, Jambes sees average daytime highs of 19°C and overnight lows near 11°C, with 58 mm of rain across 10.9 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 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 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 Jambes's 3rd-clearest and 8th-windiest month. For the whole year in context, see Jambes's year-round climate.

Daytime high
19°
4th warmest
Overnight low
11°
9th coldest
Rainfall
58 mm
10.9 wet days
Daylight
12 h 24 min
6:24 AM – 6:46 PM
Cloud cover
66%
3rd clearest
Wind
13 km/h
8th windiest
Solar energy
3.17 kWh/m²
Travel score
5.7
out of 10

Jambes is town in Namur municipality, Wallonia, 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 17°C by the end.

A typical September day in Jambes 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 14°C and 24°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)
12012
22012
32012
42012
52012
62012
72011
82011
91911
101911
111911
121911
131911
141911
151911
161911
171911
181810
191810
201810
211810
221810
231810
241810
251710
261710
271710
281710
291710
301710

How September really feels in Jambes

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.

Jambes 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 / 6612.51.98.30.1
Feb / 6211.62.89.70.5
Mar10° / 6112.71.311.52.1
Apr14° / 5311.80.113.53.7
May17° / 6512.8015.25.1
Jun20° / 12°7112.2016.15.8
Jul22° / 14°7512.7015.86.2
Aug22° / 13°7812.2014.36.3
Sep19° / 11°5810.9012.45.7
Oct14° / 6111.7010.43.8
Nov / 6512.30.78.81.6
Dec / 8013.92.17.90.3

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 14% of September, with mostly cloudy or overcast conditions the remaining 67%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
13565
23664
33664
43664
53565
63565
73565
83466
93466
103367
113367
123367
133367
143268
153466
163466
173367
183367
193367
203565
213565
223466
233466
243466
253367
263268
273268
283070
292971
302773

Chance of precipitation in September

Any precipitation

Jambes gets around 58 mm of rain over 10.9 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 37% and peaks near 41% on the wettest days.

0%10%20%30%40%50%151015202530
Rain chance (%)
136
236
336
436
536
636
736
836
937
1037
1137
1237
1337
1437
1537
1637
1737
1837
1937
2037
2137
2237
2337
2438
2538
2639
2740
2840
2941
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 76% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
164279
266268
367267
468257
568257
669256
770246
870246
971245
1072235
1173225
1274215
1376204
1477194
1578184
1679183
1780173
1881163
1982162
2082162
2182162
2283161
2383161
2483161
2583161
2683161
2783161
2883170
2983170
3084160

Wind in September

Winds average 13 km/h in September.

Across September, daily wind ranges from about 13 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
113light breeze
213light 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
2514light breeze
2614light breeze
2714light 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 6:00 AM to 6:46 AM, and sunset from 7:20 PM to 6:14 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.36:007:20
213.36:027:18
313.26:037:16
413.16:057:14
513.16:067:11
613.06:087:09
713.06:097:07
812.96:117:05
912.86:137:02
1012.86:147:00
1112.76:166:58
1212.66:176:55
1312.66:196:53
1412.56:206:51
1512.46:226:48
1612.46:246:46
1712.36:256:44
1812.26:276:41
1912.26:286:39
2012.16:306:37
2112.06:326:34
2212.06:336:32
2311.96:356:30
2411.96:366:27
2511.86:386:25
2611.76:396:23
2711.76:416:21
2811.66:436:18
2911.56:446:16
3011.56:466:14

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.17 kWh/m².

For context, solar energy here swings from a low near 0.65 kWh/m² to a high of 5.32 kWh/m² in June across the year — September's 3.17 kWh/m² falls in the middle.

01234151015202530
Solar energy (kWh/m²)Level
13.7Moderate
23.7Moderate
33.6Moderate
43.6Moderate
53.6Moderate
63.5Moderate
73.5Moderate
83.5Moderate
93.4Moderate
103.4Moderate
113.4Moderate
123.3Moderate
133.3Moderate
143.2Moderate
153.2Moderate
163.2Moderate
173.1Moderate
183.1Moderate
193.0Moderate
203.0Moderate
212.9Moderate
222.9Moderate
232.8Moderate
242.8Moderate
252.7Moderate
262.7Moderate
272.6Moderate
282.6Moderate
292.5Moderate
302.5Moderate
Planning a trip in September

Is September a good time to visit Jambes?

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

5.7
Sightseeing
4th-best month of the year
2.2
Beach & pool
4th-best month of the year

September is a reasonable time to visit Jambes for sightseeing.

What to pack for Jambes in September

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

In September, Jambes 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 Jambes 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 Jambes 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 Jambes 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 Jambes is worst in April — around 18 µg/m³ PM2.5 (moderate), about 1.6× the cleanest month (December, 11 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodApr 1217 µg/m³Dec 1111 µg/m³
PM2.5 (µg/m³)Level
Jan13Moderate
Feb13Moderate
Mar17Moderate
Apr18Moderate
May15Moderate
Jun14Moderate
Jul13Moderate
Aug14Moderate
Sep13Moderate
Oct12Good
Nov11Good
Dec11Good
Location & terrain

Where is Jambes?

Jambes sits at 50.5°N, 4.9°E, 84 m above sea level, in Belgium. The nearest listed city is Namur, 1.0 km away.

AndenneGemblouxDinantFleurusChâteletChâtelineauHuy

Topography around Jambes

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

Within 3 km, the terrain around Jambes has only modest variations in elevation — a maximum elevation change of 164 m around an average of 130 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 283 m; within 80 km, large variations in elevation — a maximum elevation change of 759 m.

The land around Jambes is covered by trees (48%) and artificial surfaces (31%) within 3 km, trees (38%) and cropland (36%) within 16 km, and trees (42%), grassland (26%) and cropland (25%) within 80 km.

3 km
164 m
16 km
283 m
80 km
759 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Namur 1.0 km · Andenne 16 km · Gembloux 17 km · Dinant 22 km · Fleurus 23 km · Châtelet 25 km · Châtelineau 25 km · Huy 26 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 Jambes (50.4564°, 4.8717°, elevation 84 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).