Grudziądz weather in September

In September, Grudziądz sees average daytime highs of 18°C and overnight lows near 10°C, with 52 mm of rain across 9 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 20°C in the first days to 16°C by the end. The sky is clear or mostly clear about 21% 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 Grudziądz's 6th-clearest and 8th-windiest month. For the whole year in context, see Grudziądz's year-round climate.

Daytime high
18°
4th warmest
Overnight low
10°
9th coldest
Rainfall
52 mm
9 wet days
Daylight
12 h 24 min
5:27 AM – 5:52 PM
Cloud cover
66%
6th clearest
Wind
13 km/h
8th windiest
Solar energy
2.88 kWh/m²
Travel score
5.8
out of 10

Grudziądz is city with powiat rights of Poland.

Air quality
Elevated
PM2.5 19.6 µg/m³ · 2019
Density
1,602/km²
people per km²
Founded
1291

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 Grudziądz reaches about 18°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 23°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
22011
32011
42011
52011
62011
72011
81911
91911
101910
111910
121910
131910
141810
151810
16189
17189
18189
19189
20179
21179
22179
23179
24178
25178
26168
27168
28168
29168
30168

How September really feels in Grudziądz

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.

Grudziądz 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°389.85.37.80.0
Feb / -3°328.74.39.40.0
Mar / -1°399.82.911.50.7
Apr13° / 389.30.613.73.6
May18° / 6211.6015.65.5
Jun21° / 11°6711.7016.76.0
Jul23° / 14°8512.6016.26.4
Aug23° / 13°6410.6014.66.7
Sep18° / 10°529012.55.8
Oct12° / 459.20.210.33.3
Nov / 379.21.78.30.6
Dec / -2°429.94.37.30.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 21% 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 63%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
13961
23961
33862
43961
53862
63862
73763
83862
93862
103763
113763
123763
133763
143763
153664
163664
173664
183664
193664
203664
213664
223763
233763
243763
253763
263565
273565
283565
293565
303565

Chance of precipitation in September

Any precipitation

Grudziądz gets around 52 mm of rain over 9 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 31% and peaks near 36% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%40%50%151015202530
Rain chance (%)
136
236
336
435
535
635
735
834
933
1033
1132
1231
1330
1430
1529
1628
1727
1827
1927
2026
2126
2227
2327
2427
2528
2628
2729
2829
2930
3030

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 83% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
167276
268266
370255
471245
571245
672235
774224
875214
976204
1077194
1179183
1281163
1382153
1483143
1584142
1685132
1786122
1887112
1989101
2089101
219091
229181
239181
249280
259370
269370
279370
289370
299370
309370

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 14 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
2214light breeze
2314light breeze
2414light breeze
2514light breeze
2614light breeze
2714light breeze
2814light breeze
2914light breeze
3014light 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 5:00 AM to 5:52 AM, and sunset from 6:30 PM to 5:16 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.55:006:30
213.45:026:27
313.45:036:25
413.35:056:22
513.25:076:20
613.15:096:17
713.15:116:15
813.05:126:12
912.95:146:10
1012.95:166:07
1112.85:186:05
1212.75:206:02
1312.65:215:59
1412.65:235:57
1512.55:255:54
1612.45:275:52
1712.35:295:49
1812.35:305:47
1912.25:325:44
2012.15:345:42
2112.15:365:39
2212.05:385:37
2311.95:395:34
2411.85:415:31
2511.85:435:29
2611.75:455:26
2711.65:475:24
2811.55:495:21
2911.55:505:19
3011.45:525:16

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 0.47 kWh/m² to a high of 5.39 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
292.4Moderate
302.3Moderate
Planning a trip in September

Is September a good time to visit Grudziądz?

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
2.0
Beach & pool
4th-best month of the year

September is a reasonable time to visit Grudziądz for sightseeing.

What to pack for Grudziądz in September

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

In September, Grudziądz sees daytime highs around 18°C and nights near 10°C. Worth packing: rain gear. About 9 days see rain.

rain gear

UV index in Grudziądz 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 Grudziądz peaks around June 19 at about 6 (high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near December 21 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 19UV 6Dec 21UV 0
UV index (midday)Level
Jan1Low
Feb1Low
Mar3Moderate
Apr4Moderate
May5High
Jun6High
Jul6High
Aug5High
Sep4Moderate
Oct2Low
Nov1Low
Dec0Low

Air quality in Grudziądz 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 Grudziądz is worst in April — around 24 µg/m³ PM2.5 (moderate), about 1.9× the cleanest month (December, 13 µg/m³).

Seasonal pattern from CAMS reanalysis, scaled to Grudziądz's WHO annual average of 19.6 µg/m³.

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateApr 1024 µg/m³Dec 1613 µg/m³
PM2.5 (µg/m³)Level
Jan16Moderate
Feb18Moderate
Mar24Moderate
Apr24Moderate
May22Moderate
Jun24Moderate
Jul22Moderate
Aug21Moderate
Sep19Moderate
Oct16Moderate
Nov15Moderate
Dec13Moderate
Location & terrain

Where is Grudziądz?

Grudziądz sits at 53.5°N, 18.8°E, 22 m above sea level, in Poland. The nearest listed city is Świecie, 22 km away.

BrodnicaTorunFordonIława

Topography around Grudziądz

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

Within 3 km, the terrain around Grudziądz has only modest variations in elevation — a maximum elevation change of 84 m around an average of 28 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 123 m; within 80 km, significant variations in elevation — a maximum elevation change of 325 m.

The land around Grudziądz is covered by trees (30%) and artificial surfaces (27%) within 3 km, cropland (45%) and trees (35%) within 16 km, and cropland (50%) and trees (36%) within 80 km.

3 km
84 m
16 km
123 m
80 km
325 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Świecie 22 km · Chełmno 26 km · Kwidzyn 29 km · Chełmża 35 km · Brodnica 49 km · Torun 53 km · Fordon 54 km · Iława 55 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 Grudziądz (53.4841°, 18.7537°, elevation 22 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).