Sieradz weather in September

In September, Sieradz sees average daytime highs of 19°C and overnight lows near 10°C, with 57 mm of rain across 9.7 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 23% 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 24 min by month's end. Set against the rest of the year, September is Sieradz's 6th-clearest and 8th-windiest month. For the whole year in context, see Sieradz's year-round climate.

Daytime high
19°
4th warmest
Overnight low
10°
9th coldest
Rainfall
57 mm
9.7 wet days
Daylight
12 h 24 min
5:28 AM – 5:51 PM
Cloud cover
64%
6th clearest
Wind
13 km/h
8th windiest
Solar energy
3.07 kWh/m²
Travel score
6.0
out of 10

Sieradz is town on the Warta river in central Poland.

Air quality
Moderate
PM10 35.1 µg/m³ · 2015
Density
868/km²
people per km²
Founded
1050

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 Sieradz reaches about 19°C in the afternoon and slips back to 10°C overnight — a 10°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
22212
32111
42111
52111
62111
72111
82111
92011
102010
112010
122010
132010
141910
151910
161910
17199
18199
19199
20189
21189
22189
23189
24188
25178
26178
27178
28178
29178
30178

How September really feels in Sieradz

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.

Sieradz 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 / -3°4110.75.58.10.0
Feb / -3°379.359.60.0
Mar / -0°4610.23.111.51.1
Apr14° / 409.20.913.64.1
May19° / 6511.70.115.35.9
Jun22° / 12°7012.5016.36.2
Jul25° / 14°8912.9015.96.4
Aug24° / 14°5910.5014.46.7
Sep19° / 10°579.7012.46.0
Oct13° / 469.10.210.43.7
Nov / 418.91.98.60.9
Dec / -2°4210.24.27.70.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 23% 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 60%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14456
24456
34456
44357
54357
64258
74357
84258
94258
104060
114060
124159
134060
144060
154060
163961
174060
183961
193961
203961
213961
223961
233961
243961
253961
263961
273862
283862
293862
303862

Chance of precipitation in September

Any precipitation

Sieradz gets around 57 mm of rain over 9.7 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 32% and peaks near 36% on the wettest days.

0%10%20%30%40%50%151015202530
Rain chance (%)
136
236
336
436
536
636
735
835
934
1034
1133
1233
1332
1431
1531
1630
1730
1830
1930
2030
2129
2229
2329
2430
2530
2630
2730
2831
2931
3031

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 85% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
171245
273234
373234
475223
575223
676213
777212
878202
979192
1079192
1180182
1282171
1383161
1484151
1585141
1686131
1786131
1887121
1988111
2090100
219190
229280
239280
249370
259370
269370
279370
289370
299460
309460

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 13 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
2513light breeze
2613light breeze
2713light breeze
2813light breeze
2913light breeze
3013light breeze

Sunrise & sunset in September

DaylightNight

Daylight runs from about 13 h 24 min at the start of September to 11 h 24 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 120 minutes over September. Sunrise moves from 5:03 AM to 5:51 AM, and sunset from 6:27 PM to 5:18 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.45:036:27
213.35:056:24
313.35:066:22
413.25:086:20
513.15:106:17
613.15:116:15
713.05:136:13
812.95:146:10
912.95:166:08
1012.85:186:05
1112.75:196:03
1212.75:216:01
1312.65:235:58
1412.55:245:56
1512.55:265:54
1612.45:285:51
1712.35:295:49
1812.35:315:46
1912.25:335:44
2012.15:345:41
2112.15:365:39
2212.05:385:37
2311.95:395:34
2411.85:415:32
2511.85:435:29
2611.75:445:27
2711.65:465:25
2811.65:485:22
2911.55:495:20
3011.45:515:18

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.07 kWh/m².

For context, solar energy here swings from a low near 0.61 kWh/m² to a high of 5.42 kWh/m² in June across the year — September's 3.07 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
143.1Moderate
153.1Moderate
163.1Moderate
173.0Moderate
183.0Moderate
193.0Moderate
202.9Moderate
212.9Moderate
222.8Moderate
232.8Moderate
242.7Moderate
252.7Moderate
262.6Moderate
272.6Moderate
282.5Moderate
292.5Moderate
302.5Moderate
Planning a trip in September

Is September a good time to visit Sieradz?

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

6.0
Sightseeing
4th-best month of the year
2.7
Beach & pool
4th-best month of the year

September is a reasonable time to visit Sieradz for sightseeing.

What to pack for Sieradz in September

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

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

rain gear

UV index in Sieradz 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 Sieradz peaks around June 19 at about 7 (high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near December 19 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 19UV 7Dec 19UV 1
UV index (midday)Level
Jan1Low
Feb1Low
Mar3Moderate
Apr4Moderate
May5High
Jun7High
Jul6High
Aug6High
Sep4Moderate
Oct2Low
Nov1Low
Dec1Low

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

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

01020JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodJun 1718 µg/m³Dec 1611 µg/m³
PM2.5 (µg/m³)Level
Jan13Moderate
Feb13Moderate
Mar17Moderate
Apr17Moderate
May16Moderate
Jun18Moderate
Jul17Moderate
Aug16Moderate
Sep15Moderate
Oct13Moderate
Nov12Moderate
Dec11Good
Location & terrain

Where is Sieradz?

Sieradz sits at 51.6°N, 18.7°E, 137 m above sea level, in Poland. The nearest listed city is Zduńska Wola, 14 km away.

WieluńPabianiceKonstantynów ŁódzkiAleksandrów ŁódzkiKaliszTurek

Topography around Sieradz

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

Within 3 km, the terrain around Sieradz has only modest variations in elevation — a maximum elevation change of 32 m around an average of 136 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 106 m; within 80 km, significant variations in elevation — a maximum elevation change of 499 m.

The land around Sieradz is covered by cropland (38%), grassland (25%) and artificial surfaces (20%) within 3 km, cropland (45%) and trees (32%) within 16 km, and cropland (51%) and trees (32%) within 80 km.

3 km
32 m
16 km
106 m
80 km
499 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Zduńska Wola 14 km · Łask 28 km · Wieluń 43 km · Pabianice 44 km · Konstantynów Łódzki 44 km · Aleksandrów Łódzki 47 km · Kalisz 48 km · Turek 49 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 Sieradz (51.5958°, 18.7302°, elevation 137 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).