Sosnowiec weather in September

In September, Sosnowiec sees average daytime highs of 19°C and overnight lows near 10°C, with 71 mm of rain across 11.1 wet days and about 12.4 hours of daylight. It is the 4th-warmest and 5th-wettest month of the year here.

Highs ease over the month, from about 21°C in the first days to 17°C by the end. The sky is clear or mostly clear about 26% 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 Sosnowiec's 3rd-clearest and 8th-windiest month. For the whole year in context, see Sosnowiec's year-round climate.

Daytime high
19°
4th warmest
Overnight low
10°
9th coldest
Rainfall
71 mm
11.1 wet days
Daylight
12 h 24 min
5:27 AM – 5:49 PM
Cloud cover
62%
3rd clearest
Wind
12 km/h
8th windiest
Solar energy
3.11 kWh/m²
Travel score
5.9
out of 10

Sosnowiec is city in the Dąbrowa Basin (the Lesser Poland part of the Silesian Voivodeship), Poland.

Air quality
Good
PM10 29.4 µg/m³ · 2019
Density
2,496/km²
people per km²
Founded
1902

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 17°C by the end.

A typical September day in Sosnowiec reaches about 19°C in the afternoon and slips back to 10°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 13°C and 25°C. Set against its neighbours, September runs about 5°C cooler than August and about 6°C warmer than October.

10°20°30°151015202530
Avg high (°C)Avg low (°C)
12212
22112
32112
42112
52111
62111
72111
82011
92011
102011
112011
122010
132010
141910
151910
161910
171910
181910
19189
20189
21189
22189
23189
24189
25179
26179
27178
28178
29178
30178

How September really feels in Sosnowiec

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.

Sosnowiec weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 5th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -4°4611.47.18.30.0
Feb / -3°4310.36.29.70.0
Mar / 5211.83.811.51.2
Apr14° / 5010.11.313.54.1
May19° / 8014015.25.5
Jun22° / 12°8213.2016.16.1
Jul24° / 14°9814015.76.3
Aug24° / 14°7111.3014.36.7
Sep19° / 10°7111.1012.45.9
Oct14° / 54100.410.53.8
Nov / 5010.12.78.81.1
Dec / -2°4510.75.27.90.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 26% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 16% of September, with mostly cloudy or overcast conditions the remaining 58%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14753
24654
34555
44555
54654
64555
74456
84456
94456
104456
114357
124357
134258
144258
154258
164159
174159
184060
194060
204060
213961
223961
233961
243862
253862
263862
273862
283862
293862
303862

Chance of precipitation in September

Any precipitation

Sosnowiec gets around 71 mm of rain over 11.1 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 39% on the wettest days.

0%10%20%30%40%50%151015202530
Rain chance (%)
138
238
339
439
539
639
739
839
939
1038
1138
1237
1337
1436
1536
1635
1735
1835
1935
2035
2135
2234
2334
2434
2534
2635
2735
2835
2935
3035

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 (%)
162308
264297
366286
467276
569265
669265
771254
872244
973234
1074233
1175223
1276213
1378202
1479192
1580182
1681172
1783161
1884151
1985141
2086131
2187121
2289110
2390100
249190
259190
269280
279280
289280
299370
309370

Wind in September

Winds average 12 km/h in September.

Across September, daily wind ranges from about 11 km/h on the calmest days to 12 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
111calm
211calm
312calm
412calm
512calm
612calm
712calm
812calm
912calm
1012calm
1112calm
1212calm
1312calm
1412calm
1512calm
1612calm
1712calm
1812calm
1912calm
2012calm
2112calm
2212calm
2312calm
2412calm
2512light breeze
2612light breeze
2712light breeze
2812light breeze
2912light breeze
3012light 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 5:03 AM to 5:49 AM, and sunset from 6:23 PM to 5:17 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.35:036:23
213.35:056:21
313.25:066:19
413.15:086:17
513.15:106:14
613.05:116:12
713.05:136:10
812.95:146:07
912.85:166:05
1012.85:176:03
1112.75:196:01
1212.65:205:58
1312.65:225:56
1412.55:245:54
1512.45:255:51
1612.45:275:49
1712.35:285:47
1812.25:305:44
1912.25:315:42
2012.15:335:40
2112.05:355:38
2212.05:365:35
2311.95:385:33
2411.95:395:31
2511.85:415:28
2611.75:435:26
2711.75:445:24
2811.65:465:21
2911.55:475:19
3011.55:495:17

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.11 kWh/m².

For context, solar energy here swings from a low near 0.73 kWh/m² to a high of 5.32 kWh/m² in June across the year — September's 3.11 kWh/m² falls in the middle.

01234151015202530
Solar energy (kWh/m²)Level
13.8Moderate
23.7Moderate
33.7Moderate
43.6Moderate
53.6Moderate
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
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 Sosnowiec?

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

5.9
Sightseeing
4th-best month of the year
2.6
Beach & pool
4th-best month of the year

September is a reasonable time to visit Sosnowiec for sightseeing.

What to pack for Sosnowiec in September

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

In September, Sosnowiec sees daytime highs around 19°C and nights near 10°C. Worth packing: rain gear. About 11 days see rain.

rain gear

UV index in Sosnowiec 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 Sosnowiec peaks around June 21 at about 7 (high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near December 18 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 7 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighModerateLowJun 21UV 7Dec 18UV 1
UV index (midday)Level
Jan1Low
Feb1Low
Mar4Moderate
Apr5Moderate
May6High
Jun7High
Jul7High
Aug6High
Sep4Moderate
Oct2Moderate
Nov1Low
Dec1Low

Air quality in Sosnowiec 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 Sosnowiec is worst in June — around 25 µg/m³ PM2.5 (moderate), and holds fairly steady the rest of the year.

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateJun 1625 µg/m³Dec 1618 µg/m³
PM2.5 (µg/m³)Level
Jan20Moderate
Feb20Moderate
Mar24Moderate
Apr23Moderate
May24Moderate
Jun25Moderate
Jul24Moderate
Aug24Moderate
Sep23Moderate
Oct20Moderate
Nov20Moderate
Dec18Moderate
Location & terrain

Where is Sosnowiec?

Sosnowiec sits at 50.3°N, 19.1°E, 256 m above sea level, in Poland. The nearest listed city is Czeladź, 4.0 km away.

Topography around Sosnowiec

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

Within 3 km, the terrain around Sosnowiec has only modest variations in elevation — a maximum elevation change of 65 m around an average of 264 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 174 m; within 80 km, large variations in elevation — a maximum elevation change of 1,190 m.

The land around Sosnowiec is covered by trees (44%) and artificial surfaces (41%) within 3 km, trees (52%) and artificial surfaces (23%) within 16 km, and trees (49%) and cropland (29%) within 80 km.

3 km
65 m
16 km
174 m
80 km
1,190 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Czeladź 4.0 km · Będzin 5.0 km · Katowice 7.0 km · Siemianowice Śląskie 7.0 km · Dąbrowa Górnicza 9.0 km · Chorzów 9.0 km · Mysłowice 10 km · Świętochłowice 13 km

Poland travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type C / E
230 V · 50 Hz
Prices
≈ 52% of US
price level, 2025
GDP per capita
$28,420
2025
Happiness
6.8 / 10
World Happiness, 2025
Safe drinking water
89%
of population, 2024
Homicide rate
0.8
per 100k, 2023
Road deaths
9.4
per 100k/yr, 2019
Income group
High
World Bank
English
Very high
EF EPI 600
Religion
Roman Catholic 71%refused to answer 21%no religion 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 Sosnowiec (50.2868°, 19.1039°, elevation 256 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).