Jablonec nad Nisou weather in September

In September, Jablonec nad Nisou sees average daytime highs of 16°C and overnight lows near 8°C, with 86 mm of rain across 12.4 wet days and about 12.4 hours of daylight. It is the 4th-warmest and 6th-wettest month of the year here.

Highs ease over the month, from about 18°C in the first days to 14°C by the end. The sky is clear or mostly clear about 21% 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 Jablonec nad Nisou's 4th-clearest and 9th-windiest month. For the whole year in context, see Jablonec nad Nisou's year-round climate.

Daytime high
16°
4th warmest
Overnight low
9th coldest
Rainfall
86 mm
12.4 wet days
Daylight
12 h 24 min
5:42 AM – 6:05 PM
Cloud cover
65%
4th clearest
Wind
10 km/h
9th windiest
Solar energy
3.08 kWh/m²
Travel score
4.6
out of 10

Jablonec nad Nisou is city in Czechia.

Air quality
Good
PM10 15.8 µg/m³ · 2019
Density
1,472/km²
people per km²
Founded
1356

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 18°C in the first days to 14°C by the end.

A typical September day in Jablonec nad Nisou reaches about 16°C in the afternoon and slips back to 8°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 11°C and 22°C. Set against its neighbours, September runs about 5°C cooler than August and about 6°C warmer than October.

10°15°20°25°151015202530
Avg high (°C)Avg low (°C)
11810
21810
31810
41810
5189
6189
7179
8179
9179
10179
11179
12179
13178
14168
15168
16168
17168
18168
19167
20157
21157
22157
23157
24157
25157
26147
27147
28146
29146
30146

How September really feels in Jablonec nad Nisou

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.

Jablonec nad Nisou weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 6th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan-0° / -5°8814.511.98.20.0
Feb / -4°6912.19.29.70.0
Mar / -2°8114.18.411.50.3
Apr11° / 5912.42.913.52.6
May16° / 9315.20.215.24.4
Jun19° / 10°10515.6016.25.2
Jul21° / 12°12916.5015.85.5
Aug21° / 12°10514.4014.35.8
Sep16° / 8612.4012.44.6
Oct11° / 74121.110.42.3
Nov / 7312.25.68.70.2
Dec / -4°8114.211.37.80.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 21% 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 65%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
13763
23763
33763
43862
53664
63664
73763
83664
93664
103664
113664
123763
133763
143763
153763
163664
173664
183664
193664
203565
213565
223565
233565
243466
253367
263268
273268
283169
293169
303169

Chance of precipitation in September

Any precipitation

Jablonec nad Nisou gets around 86 mm of rain over 12.4 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 42% and peaks near 48% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
148
248
348
447
547
646
746
845
944
1044
1143
1242
1341
1441
1540
1639
1739
1839
1939
2038
2138
2238
2338
2439
2539
2639
2740
2841
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 91% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
179183
280173
382162
483152
584142
685141
786131
886131
988120
1089110
1189110
1290100
1390100
149190
159190
169280
179370
189370
199460
209550
219550
229640
239640
249730
259730
269820
279820
289820
299910
309910

Wind in September

Winds average 10 km/h in September.

Across September, daily wind ranges from about 10 km/h on the calmest days to 11 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
110calm
210calm
310calm
410calm
510calm
610calm
710calm
810calm
910calm
1010calm
1110calm
1210calm
1310calm
1410calm
1510calm
1610calm
1710calm
1810calm
1910calm
2010calm
2110calm
2210calm
2310calm
2410calm
2510calm
2610calm
2710calm
2810calm
2910calm
3011calm

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 5:18 AM to 6:05 AM, and sunset from 6:40 PM to 5:32 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.45:186:40
213.35:206:37
313.25:226:35
413.25:236:33
513.15:256:31
613.05:266:28
713.05:286:26
812.95:306:24
912.85:316:21
1012.85:336:19
1112.75:346:17
1212.65:366:14
1312.65:386:12
1412.55:396:10
1512.45:416:07
1612.45:426:05
1712.35:446:03
1812.25:456:00
1912.25:475:58
2012.15:495:56
2112.05:505:53
2212.05:525:51
2311.95:545:49
2411.95:555:46
2511.85:575:44
2611.75:585:42
2711.76:005:39
2811.66:025:37
2911.56:035:35
3011.56:055:32

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.08 kWh/m².

For context, solar energy here swings from a low near 0.7 kWh/m² to a high of 5.3 kWh/m² in June across the year — September's 3.08 kWh/m² falls in the middle.

01234151015202530
Solar energy (kWh/m²)Level
13.7Moderate
23.7Moderate
33.6Moderate
43.6Moderate
53.5Moderate
63.5Moderate
73.4Moderate
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
242.8Moderate
252.7Moderate
262.7Moderate
272.6Moderate
282.6Moderate
292.5Moderate
302.5Moderate
Planning a trip in September

Is September a good time to visit Jablonec nad Nisou?

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

4.6
Sightseeing
4th-best month of the year
0.8
Beach & pool
4th-best month of the year

September is a reasonable time to visit Jablonec nad Nisou for sightseeing.

What to pack for Jablonec nad Nisou in September

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

In September, Jablonec nad Nisou sees daytime highs around 16°C and nights near 8°C. Worth packing: a warm layer and rain gear. About 12 days see rain.

a warm layerrain gear

UV index in Jablonec nad Nisou in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 5 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Jablonec nad Nisou peaks around June 20 at about 7 (very 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.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighHighModerateLowJun 20UV 7Dec 22UV 1
UV index (midday)Level
Jan1Low
Feb2Low
Mar4Moderate
Apr4Moderate
May6High
Jun7Very high
Jul7High
Aug6High
Sep5Moderate
Oct2Moderate
Nov1Low
Dec1Low

Air quality in Jablonec nad Nisou 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 Jablonec nad Nisou is worst in June — around 18 µg/m³ PM2.5 (moderate), and holds fairly steady the rest of the year.

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

01020JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodJun 1617 µg/m³Dec 1112 µg/m³
PM2.5 (µg/m³)Level
Jan14Moderate
Feb14Moderate
Mar17Moderate
Apr17Moderate
May16Moderate
Jun18Moderate
Jul16Moderate
Aug17Moderate
Sep15Moderate
Oct13Moderate
Nov12Good
Dec12Good
Location & terrain

Where is Jablonec nad Nisou?

Jablonec nad Nisou sits at 50.7°N, 15.2°E, 475 m above sea level, in Czechia. The nearest listed city is Liberec, 9.0 km away.

ZittauJičínMladá BoleslavJelenia GóraLubańČeská Lípa

Topography around Jablonec nad Nisou

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

Within 3 km, the terrain around Jablonec nad Nisou has significant variations in elevation — a maximum elevation change of 362 m around an average of 552 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 860 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,572 m.

The land around Jablonec nad Nisou is covered by trees (69%) within 3 km, trees (69%) within 16 km, and trees (45%) and cropland (34%) within 80 km.

3 km
362 m
16 km
860 m
80 km
1,572 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Liberec 9.0 km · Bogatynia 25 km · Zittau 32 km · Jičín 34 km · Mladá Boleslav 40 km · Jelenia Góra 44 km · Lubań 45 km · Česká Lípa 45 km

Czechia travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type C / E
230 V · 50 Hz
Prices
≈ 59% of US
price level, 2025
GDP per capita
$35,917
2025
Happiness
6.8 / 10
World Happiness, 2025
Safe drinking water
98%
of population, 2024
Homicide rate
0.8
per 100k, 2023
Road deaths
5.9
per 100k/yr, 2019
Income group
High
World Bank
English
High
EF EPI 582
Religion
none 48%believers unaffiliated with a religious society 9%Roman Catholic 7%other believers belonging to a church or religious society 6%

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 Jablonec nad Nisou (50.7243°, 15.1711°, elevation 475 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).