Kartuzy weather in September

In September, Kartuzy sees average daytime highs of 17°C and overnight lows near 9°C, with 57 mm of rain across 10.6 wet days and about 12.5 hours of daylight. It is the 4th-warmest and 5th-wettest month of the year here.

Highs ease over the month, from about 19°C in the first days to 15°C by the end. The sky is clear or mostly clear about 20% of the time in September, and the air most often feels dry.

Daylight stretches from about 13 h 30 min at the start of September to 11 h 24 min by month's end. Set against the rest of the year, September is Kartuzy's 6th-clearest and 7th-windiest month. For the whole year in context, see Kartuzy's year-round climate.

Daytime high
17°
4th warmest
Overnight low
9th coldest
Rainfall
57 mm
10.6 wet days
Daylight
12 h 24 min
5:29 AM – 5:54 PM
Cloud cover
66%
6th clearest
Wind
14 km/h
7th windiest
Solar energy
2.88 kWh/m²
Travel score
5.2
out of 10

Kartuzy is city in Pomeranian Voivodeship, Poland.

Density
2,408/km²
people per km²
Founded
1391

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 19°C in the first days to 15°C by the end.

A typical September day in Kartuzy reaches about 17°C in the afternoon and slips back to 9°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 13°C and 22°C. Set against its neighbours, September runs about 4°C cooler than August and about 6°C warmer than October.

10°15°20°25°151015202530
Avg high (°C)Avg low (°C)
11911
21911
31911
41911
51910
61810
71810
81810
91810
101810
111810
121810
13179
14179
15179
16179
17179
18179
19179
20168
21168
22168
23168
24168
25168
26158
27158
28157
29157
30157

How September really feels in Kartuzy

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.

Kartuzy 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°4210.46.17.70.0
Feb / -3°3595.99.30.0
Mar / -1°4310.74.511.50.4
Apr11° / 4310.11.413.72.9
May16° / 6912.1015.75.0
Jun19° / 10°7913.2016.85.6
Jul21° / 13°9914.1016.45.9
Aug21° / 13°8013.2014.76.0
Sep17° / 5710.6012.55.2
Oct11° / 4910.80.310.22.8
Nov / 389.32.28.20.4
Dec / -2°4410.34.87.20.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 20% 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 64%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
13961
23862
33862
43763
53664
63565
73565
83565
93565
103565
113565
123565
133565
143565
153565
163664
173664
183664
193763
203763
213763
223763
233862
243862
253862
263763
273763
283763
293763
303565

Chance of precipitation in September

Any precipitation

Kartuzy gets around 57 mm of rain over 10.6 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 47% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
147
247
346
446
545
645
744
843
942
1040
1139
1238
1337
1436
1534
1633
1732
1831
1930
2029
2129
2229
2329
2429
2529
2630
2730
2831
2931
3032

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 86% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
170264
271254
373243
473243
574233
675223
777212
878202
979192
1080182
1182171
1284151
1385141
1486131
1587121
1688111
1789101
189091
199280
209280
219370
229460
239460
249550
259550
269550
279550
289550
299550
309550

Wind in September

Winds average 14 km/h in September.

Across September, daily wind ranges from about 14 km/h on the calmest days to 15 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202530
Wind speed (km/h)Feels
114light breeze
214light breeze
314light breeze
414light breeze
514light breeze
614light breeze
714light breeze
814light breeze
914light breeze
1014light breeze
1114light breeze
1214light breeze
1314light breeze
1414light breeze
1514light breeze
1614light breeze
1715light breeze
1815light breeze
1915light breeze
2015light breeze
2115light breeze
2215light breeze
2315light breeze
2415light breeze
2515light breeze
2615light breeze
2715light breeze
2815light breeze
2915light breeze
3015light breeze

Sunrise & sunset in September

DaylightNight

Daylight runs from about 13 h 30 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 126 minutes over September. Sunrise moves from 5:01 AM to 5:55 AM, and sunset from 6:33 PM to 5:18 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.55:016:33
213.55:026:31
313.45:046:28
413.35:066:26
513.25:086:23
613.25:106:20
713.15:126:18
813.05:146:15
913.05:166:13
1012.95:176:10
1112.85:196:08
1212.75:216:05
1312.75:236:02
1412.65:256:00
1512.55:275:57
1612.45:295:54
1712.45:305:52
1812.35:325:49
1912.25:345:47
2012.15:365:44
2112.15:385:41
2212.05:405:39
2311.95:425:36
2411.85:445:34
2511.85:465:31
2611.75:475:28
2711.65:495:26
2811.55:515:23
2911.55:535:21
3011.45:555:18

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 2.88 kWh/m².

For context, solar energy here swings from a low near 0.44 kWh/m² to a high of 5.5 kWh/m² in June across the year — September's 2.88 kWh/m² falls in the middle.

01234151015202530
Solar energy (kWh/m²)Level
13.5Moderate
23.5Moderate
33.4Moderate
43.4Moderate
53.3Moderate
63.3Moderate
73.2Moderate
83.2Moderate
93.1Moderate
103.1Moderate
113.0Moderate
123.0Moderate
133.0Moderate
142.9Moderate
152.9Moderate
162.9Moderate
172.8Moderate
182.8Moderate
192.8Moderate
202.7Moderate
212.7Moderate
222.6Moderate
232.6Moderate
242.6Moderate
252.5Moderate
262.5Moderate
272.4Moderate
282.4Moderate
292.3Moderate
302.3Moderate
Planning a trip in September

Is September a good time to visit Kartuzy?

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

5.2
Sightseeing
4th-best month of the year
1.3
Beach & pool
4th-best month of the year

September is a reasonable time to visit Kartuzy for sightseeing.

What to pack for Kartuzy in September

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

In September, Kartuzy sees daytime highs around 17°C and nights near 9°C. Worth packing: rain gear. About 11 days see rain.

rain gear

Sea temperature near Kartuzy in September

The nearest coast averages about 16°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 43 km away) is warmest in August at about 19°C and coldest in February near 3°C.

The water stays below 20°C all year — cool enough that most swimmers want a wetsuit.

0°5°10°15°20°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshing
Sea temperature (°C)Comfort
Jan4Bracing
Feb3Bracing
Mar3Bracing
Apr5Bracing
May9Bracing
Jun14Bracing
Jul17Cool
Aug19Cool
Sep16Cool
Oct13Bracing
Nov9Bracing
Dec6Bracing

UV index in Kartuzy 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 Kartuzy peaks around June 18 at about 6 (high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near December 20 at about 0 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 6 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighModerateLowJun 18UV 6Dec 20UV 0
UV index (midday)Level
Jan1Low
Feb1Low
Mar3Moderate
Apr4Moderate
May5Moderate
Jun6High
Jul6High
Aug5Moderate
Sep4Moderate
Oct2Low
Nov1Low
Dec0Low
Location & terrain

Where is Kartuzy?

Kartuzy sits at 54.3°N, 18.2°E, 210 m above sea level, in Poland. The nearest listed city is Osowa, 21 km away.

Topography around Kartuzy

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

Within 3 km, the terrain around Kartuzy has only modest variations in elevation — a maximum elevation change of 114 m around an average of 222 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 235 m; within 80 km, significant variations in elevation — a maximum elevation change of 339 m.

The land around Kartuzy is covered by trees (72%) within 3 km, trees (43%), grassland (26%) and cropland (24%) within 16 km, and trees (35%), water (27%) and cropland (25%) within 80 km.

3 km
114 m
16 km
235 m
80 km
339 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Osowa 21 km · Piecki-Migowo 25 km · Wrzeszcz Górny 26 km · Ujeścisko-Łostowice 26 km · Sopot 26 km · Wrzeszcz 27 km · Orunia Górna-Gdańsk Południe 27 km · Chełm 27 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 Kartuzy (54.3342°, 18.1974°, elevation 210 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. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).