Piaseczno weather in September

In September, Piaseczno sees average daytime highs of 19°C and overnight lows near 9°C, with 58 mm of rain across 9.7 wet days and about 12.4 hours of daylight. It is the 5th-warmest and 5th-wettest month of the year here.

Highs ease over the month, from about 21°C in the first days to 16°C by the end. The sky is clear or mostly clear about 24% 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 Piaseczno's 6th-clearest and 8th-windiest month. For the whole year in context, see Piaseczno's year-round climate.

Daytime high
19°
5th warmest
Overnight low
9th coldest
Rainfall
58 mm
9.7 wet days
Daylight
12 h 24 min
5:18 AM – 5:42 PM
Cloud cover
64%
6th clearest
Wind
12 km/h
8th windiest
Solar energy
3.01 kWh/m²
Travel score
5.8
out of 10

Piaseczno is city of Poland.

Air quality
Elevated
PM2.5 16.5 µg/m³ · 2019
Density
2,222/km²
people per km²
Founded
1250

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 16°C by the end.

A typical September day in Piaseczno reaches about 19°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 13°C and 24°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)
12112
22111
32111
42111
52111
62011
72011
82011
92010
102010
111910
121910
131910
141910
151910
16199
17189
18189
19189
20189
21189
22178
23178
24178
25178
26178
27178
28168
29168
30168

How September really feels in Piaseczno

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.

Piaseczno weather by month

How September compares with the rest of the year at a glance. September is the 5th-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°399.95.780.0
Feb / -3°379.85.59.60.0
Mar / -0°4310.42.911.50.9
Apr14° / 479.70.813.64.0
May19° / 6912.40.115.45.8
Jun22° / 12°6911.8016.46.3
Jul24° / 14°8412.90166.5
Aug24° / 14°6710.4014.46.8
Sep19° / 589.7012.45.8
Oct13° / 459.60.210.43.4
Nov / 409.22.48.50.7
Dec / -2°419.84.57.60.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 24% 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 61%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14555
24555
34456
44258
54258
64159
74159
84060
93961
103961
113862
123862
133862
143862
153763
163763
173763
183961
193862
203862
213961
223961
233961
243961
253961
263862
273862
283862
293763
303763

Chance of precipitation in September

Any precipitation

Piaseczno gets around 58 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 33% and peaks near 36% on the wettest days.

0%10%20%30%40%50%151015202530
Rain chance (%)
135
235
336
436
536
636
735
835
935
1035
1134
1234
1333
1432
1532
1631
1731
1831
1930
2030
2130
2230
2330
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 82% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
169247
270246
370246
471245
572235
673234
773234
874224
975214
1076204
1177203
1278193
1379183
1480173
1582162
1683152
1784142
1885132
1986122
2088111
2188111
2289101
239091
249190
259280
269280
279370
289370
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
311calm
411calm
512calm
612calm
712calm
812calm
912calm
1012calm
1112calm
1212calm
1312calm
1412calm
1512calm
1612calm
1712calm
1812calm
1912calm
2012calm
2112calm
2212calm
2312calm
2412calm
2512calm
2612light breeze
2712light breeze
2812light breeze
2912light breeze
3012light 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 4:53 AM to 5:42 AM, and sunset from 6:18 PM to 5:08 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.44:536:18
213.44:556:16
313.34:566:14
413.24:586:11
513.25:006:09
613.15:016:06
713.05:036:04
812.95:056:02
912.95:065:59
1012.85:085:57
1112.75:105:54
1212.75:125:52
1312.65:135:49
1412.55:155:47
1512.55:175:45
1612.45:185:42
1712.35:205:40
1812.35:225:37
1912.25:235:35
2012.15:255:32
2112.15:275:30
2212.05:295:27
2311.95:305:25
2411.85:325:23
2511.85:345:20
2611.75:355:18
2711.65:375:15
2811.65:395:13
2911.55:415:11
3011.45:425:08

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.01 kWh/m².

For context, solar energy here swings from a low near 0.55 kWh/m² to a high of 5.51 kWh/m² in June across the year — September's 3.01 kWh/m² falls in the middle.

01234151015202530
Solar energy (kWh/m²)Level
13.7Moderate
23.6Moderate
33.6Moderate
43.5Moderate
53.5Moderate
63.4Moderate
73.4Moderate
83.4Moderate
93.3Moderate
103.3Moderate
113.2Moderate
123.2Moderate
133.1Moderate
143.1Moderate
153.0Moderate
163.0Moderate
173.0Moderate
182.9Moderate
192.9Moderate
202.8Moderate
212.8Moderate
222.8Moderate
232.7Moderate
242.7Moderate
252.6Moderate
262.6Moderate
272.5Moderate
282.5Moderate
292.5Moderate
302.4Moderate
Planning a trip in September

Is September a good time to visit Piaseczno?

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

5.8
Sightseeing
4th-best month of the year
2.4
Beach & pool
5th-best month of the year

September is a reasonable time to visit Piaseczno for sightseeing.

What to pack for Piaseczno in September

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

In September, Piaseczno sees daytime highs around 19°C and nights near 9°C. Worth packing: rain gear. About 10 days see rain.

rain gear

UV index in Piaseczno 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 Piaseczno peaks around June 20 at about 6 (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 20UV 6Dec 19UV 1
UV index (midday)Level
Jan1Low
Feb1Low
Mar3Moderate
Apr4Moderate
May5High
Jun6High
Jul6High
Aug6High
Sep4Moderate
Oct2Low
Nov1Low
Dec1Low

Air quality in Piaseczno 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 Piaseczno is worst in June — around 20 µg/m³ PM2.5 (moderate), about 1.8× the cleanest month (December, 11 µg/m³).

Seasonal pattern from CAMS reanalysis, scaled to Piaseczno's WHO annual average of 16.5 µg/m³.

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodJun 1820 µg/m³Dec 1712 µg/m³
PM2.5 (µg/m³)Level
Jan13Moderate
Feb15Moderate
Mar19Moderate
Apr19Moderate
May19Moderate
Jun20Moderate
Jul19Moderate
Aug18Moderate
Sep16Moderate
Oct14Moderate
Nov13Moderate
Dec11Good
Location & terrain

Where is Piaseczno?

Piaseczno sits at 52.1°N, 21.0°E, 108 m above sea level, in Poland. The nearest listed city is Konstancin-Jeziorna, 7.0 km away.

Topography around Piaseczno

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

Within 3 km, the terrain around Piaseczno has only modest variations in elevation — a maximum elevation change of 35 m around an average of 109 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 93 m; within 80 km, only modest variations in elevation — a maximum elevation change of 176 m.

The land around Piaseczno is covered by trees (40%) and artificial surfaces (35%) within 3 km, trees (48%) and grassland (22%) within 16 km, and trees (42%), cropland (30%) and grassland (24%) within 80 km.

3 km
35 m
16 km
93 m
80 km
176 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Konstancin-Jeziorna 7.0 km · Kabaty 7.0 km · Ursynów 8.0 km · Włochy 12 km · Mokotów 12 km · Józefów 16 km · Ochota 16 km · Ursus 16 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 Piaseczno (52.0814°, 21.024°, elevation 108 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).