Cieszyn weather in September

In September, Cieszyn sees average daytime highs of 18°C and overnight lows near 9°C, with 94 mm of rain across 12.3 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 20°C in the first days to 16°C by the end. The sky is clear or mostly clear about 25% 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 Cieszyn's 3rd-clearest and 8th-windiest month. For the whole year in context, see Cieszyn's year-round climate.

Daytime high
18°
4th warmest
Overnight low
9th coldest
Rainfall
94 mm
12.3 wet days
Daylight
12 h 24 min
5:29 AM – 5:51 PM
Cloud cover
62%
3rd clearest
Wind
10 km/h
8th windiest
Solar energy
3.11 kWh/m²
Travel score
5.4
out of 10

Cieszyn is border town in southern Poland and the administrative seat of Cieszyn County, Silesian Voivodeship.

Air quality
Good
PM10 23.9 µg/m³ · 2019
Density
1,240/km²
people per km²
Founded
1155

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 Cieszyn reaches about 18°C in the afternoon and slips back to 9°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 12°C and 24°C. Set against its neighbours, September runs about 5°C cooler than August and about 5°C warmer than October.

10°20°30°151015202530
Avg high (°C)Avg low (°C)
12111
22011
32011
42011
52011
62011
71910
81910
91910
101910
111910
121910
131910
141810
15189
16189
17189
18189
19189
20179
21179
22178
23178
24178
25178
26168
27168
28168
29168
30168

How September really feels in Cieszyn

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.

Cieszyn 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°6312.79.88.40.0
Feb / -4°6112.29.39.80.0
Mar / -1°6913.16.211.50.9
Apr13° / 6811.72.413.53.6
May18° / 11015.80.115.15.0
Jun21° / 12°115150165.6
Jul23° / 13°13415.9015.76.0
Aug23° / 13°9812.5014.26.5
Sep18° / 9412.3012.45.4
Oct13° / 7211.4110.53.4
Nov / 6411.84.38.80.9
Dec / -3°6212.18.180.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 25% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 17% of September, with mostly cloudy or overcast conditions the remaining 57%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14852
24852
34753
44654
54654
64654
74456
84456
94456
104357
114357
124357
134258
144258
154258
164258
174159
184159
194159
204060
214060
224060
234159
244159
254159
264159
274159
284159
294159
304060

Chance of precipitation in September

Any precipitation

Cieszyn gets around 94 mm of rain over 12.3 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 41% and peaks near 45% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
145
245
345
445
545
644
744
844
943
1043
1142
1241
1341
1440
1540
1639
1739
1839
1939
2039
2138
2238
2338
2438
2538
2638
2738
2838
2938
3038

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 82% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
165287
267276
369265
470264
571254
672253
773243
874242
975232
1076231
1177221
1278211
1379201
1480191
1582180
1683170
1784160
1885150
1986140
2087130
2188120
2290100
239190
249190
259280
269370
279370
289460
299460
309460

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
2011calm
2111calm
2211calm
2311calm
2411calm
2511calm
2611calm
2711calm
2811calm
2911calm
3011calm

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 5:06 AM to 5:50 AM, and sunset from 6:24 PM to 5:19 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.35:066:24
213.25:086:22
313.25:096:20
413.15:116:18
513.15:126:16
613.05:146:13
712.95:156:11
812.95:176:09
912.85:186:07
1012.75:206:04
1112.75:216:02
1212.65:236:00
1312.65:245:58
1412.55:265:55
1512.45:275:53
1612.45:295:51
1712.35:305:48
1812.25:325:46
1912.25:335:44
2012.15:355:42
2112.05:375:39
2212.05:385:37
2311.95:405:35
2411.95:415:33
2511.85:435:30
2611.75:445:28
2711.75:465:26
2811.65:475:24
2911.55:495:21
3011.55:505:19

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 0.76 kWh/m² to a high of 5.24 kWh/m² in June across the year — September's 3.11 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
133.3Moderate
143.2Moderate
153.2Moderate
163.1Moderate
173.1Moderate
183.0Moderate
193.0Moderate
203.0Moderate
212.9Moderate
222.9Moderate
232.8Moderate
242.8Moderate
252.7Moderate
262.7Moderate
272.6Moderate
282.6Moderate
292.6Moderate
302.5Moderate
Planning a trip in September

Is September a good time to visit Cieszyn?

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

5.4
Sightseeing
4th-best month of the year
1.9
Beach & pool
4th-best month of the year

September is a reasonable time to visit Cieszyn for sightseeing.

What to pack for Cieszyn in September

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

In September, Cieszyn sees daytime highs around 18°C and nights near 9°C. Worth packing: rain gear. About 12 days see rain.

rain gear

UV index in Cieszyn 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 Cieszyn peaks around June 23 at about 7 (very high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near December 20 at about 1 (low).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highHighModerateLowJun 23UV 7Dec 20UV 1
UV index (midday)Level
Jan1Low
Feb2Low
Mar4Moderate
Apr5Moderate
May6High
Jun7Very high
Jul7Very high
Aug6High
Sep4Moderate
Oct2Moderate
Nov1Low
Dec1Low

Air quality in Cieszyn 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 Cieszyn is worst in June — around 17 µg/m³ PM2.5 (moderate), about 1.7× the cleanest month (December, 10 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodJun 1717 µg/m³Dec 1310 µg/m³
PM2.5 (µg/m³)Level
Jan12Moderate
Feb13Moderate
Mar15Moderate
Apr16Moderate
May16Moderate
Jun17Moderate
Jul16Moderate
Aug16Moderate
Sep14Moderate
Oct11Good
Nov11Good
Dec10Good
Location & terrain

Where is Cieszyn?

Cieszyn sits at 49.8°N, 18.6°E, 273 m above sea level, in Poland. The nearest listed city is Český Těšín, 1.0 km away.

Topography around Cieszyn

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

Within 3 km, the terrain around Cieszyn has only modest variations in elevation — a maximum elevation change of 125 m around an average of 305 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 818 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,549 m.

The land around Cieszyn is covered by trees (45%), grassland (22%) and artificial surfaces (22%) within 3 km, trees (48%), grassland (24%) and cropland (20%) within 16 km, and trees (57%) and cropland (23%) within 80 km.

3 km
125 m
16 km
818 m
80 km
1,549 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Český Těšín 1.0 km · Třinec 9.0 km · Ustroń 13 km · Karviná 13 km · Havířov 14 km · Orlová 18 km · Frýdek-Místek 22 km · Jastrzębie Zdrój 23 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 Cieszyn (49.7513°, 18.6321°, elevation 273 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).