Bydgoszcz weather in September

In September, Bydgoszcz sees average daytime highs of 18°C and overnight lows near 10°C, with 50 mm of rain across 8.7 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 20°C in the first days to 16°C by the end. The sky is clear or mostly clear about 22% 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 Bydgoszcz's 6th-clearest and 8th-windiest month. For the whole year in context, see Bydgoszcz's year-round climate.

Daytime high
18°
4th warmest
Overnight low
10°
9th coldest
Rainfall
50 mm
8.7 wet days
Daylight
12 h 24 min
5:30 AM – 5:55 PM
Cloud cover
66%
6th clearest
Wind
13 km/h
8th windiest
Solar energy
2.93 kWh/m²
Travel score
5.9
out of 10

Bydgoszcz is city in the Kuyavian-Pomeranian Voivodeship in north-central Poland.

Air quality
Elevated
PM2.5 18.1 µg/m³ · 2019
Density
1,875/km²
people per km²
Founded
1038

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 Bydgoszcz 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 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
22112
32011
42011
52011
62011
72011
82011
91911
101910
111910
121910
131910
141910
151810
161810
17189
18189
19189
20189
21179
22179
23179
24179
25178
26178
27168
28168
29168
30168

How September really feels in Bydgoszcz

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.

Bydgoszcz 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°3810.14.77.90.0
Feb / -2°318.14.39.50.0
Mar / 43102.411.50.9
Apr13° / 358.80.513.63.8
May18° / 5810.8015.55.8
Jun21° / 12°6311.3016.66.2
Jul23° / 14°8311.6016.26.6
Aug23° / 14°6210.4014.56.8
Sep18° / 10°508.7012.45.9
Oct12° / 439.20.110.33.4
Nov / 368.91.68.40.7
Dec / -1°399.33.57.40.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 22% 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
43862
53862
63862
73862
83862
93862
103763
113763
123763
133862
143862
153862
163862
173862
183862
193763
203763
213763
223763
233763
243664
253664
263664
273664
283664
293664
303664

Chance of precipitation in September

Any precipitation

Bydgoszcz gets around 50 mm of rain over 8.7 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 30% and peaks near 35% on the wettest days.

0%10%20%30%40%50%151015202530
Rain chance (%)
135
235
335
434
534
634
733
833
932
1032
1131
1230
1329
1429
1528
1627
1726
1826
1926
2025
2125
2226
2326
2426
2527
2628
2728
2829
2930
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 83% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
168257
269256
370246
471236
573225
673225
775214
876204
978193
1079183
1180173
1280173
1382162
1483152
1584142
1685132
1787121
1888111
1988111
2089101
219190
229190
239280
249280
259280
269370
279370
289370
299370
309370

Wind in September

Winds average 13 km/h in September.

Across September, daily wind ranges from about 12 km/h on the calmest days to 13 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
112light breeze
212light breeze
312light breeze
412light breeze
512light breeze
612light breeze
712light breeze
812light breeze
912light breeze
1012light breeze
1112light breeze
1212light breeze
1312light breeze
1412light breeze
1512light 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 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 5:03 AM to 5:55 AM, and sunset from 6:32 PM to 5:20 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.55:036:32
213.45:056:30
313.35:076:27
413.35:096:25
513.25:106:22
613.15:126:20
713.15:146:17
813.05:166:15
912.95:186:12
1012.85:196:10
1112.85:216:07
1212.75:236:05
1312.65:256:02
1412.65:266:00
1512.55:285:57
1612.45:305:55
1712.35:325:52
1812.35:335:50
1912.25:355:47
2012.15:375:45
2112.15:395:42
2212.05:415:40
2311.95:425:37
2411.85:445:35
2511.85:465:32
2611.75:485:30
2711.65:505:27
2811.65:515:25
2911.55:535:22
3011.45:555:20

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 2.93 kWh/m².

For context, solar energy here swings from a low near 0.49 kWh/m² to a high of 5.39 kWh/m² in June across the year — September's 2.93 kWh/m² falls in the middle.

01234151015202530
Solar energy (kWh/m²)Level
13.6Moderate
23.5Moderate
33.5Moderate
43.4Moderate
53.4Moderate
63.3Moderate
73.3Moderate
83.2Moderate
93.2Moderate
103.1Moderate
113.1Moderate
123.1Moderate
133.0Moderate
143.0Moderate
153.0Moderate
162.9Moderate
172.9Moderate
182.9Moderate
192.8Moderate
202.8Moderate
212.7Moderate
222.7Moderate
232.7Moderate
242.6Moderate
252.6Moderate
262.5Moderate
272.5Moderate
282.4Moderate
292.4Moderate
302.3Moderate
Planning a trip in September

Is September a good time to visit Bydgoszcz?

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

5.9
Sightseeing
4th-best month of the year
2.2
Beach & pool
4th-best month of the year

September is a reasonable time to visit Bydgoszcz for sightseeing.

What to pack for Bydgoszcz in September

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

In September, Bydgoszcz 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 Bydgoszcz 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 Bydgoszcz 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 19 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 19UV 0
UV index (midday)Level
Jan1Low
Feb1Low
Mar3Moderate
Apr4Moderate
May5High
Jun6High
Jul6High
Aug5High
Sep4Moderate
Oct2Low
Nov1Low
Dec0Low

Air quality in Bydgoszcz 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 Bydgoszcz is worst in April — around 23 µg/m³ PM2.5 (moderate), about 1.9× the cleanest month (December, 12 µg/m³).

Seasonal pattern from CAMS reanalysis, scaled to Bydgoszcz's WHO annual average of 18.1 µg/m³.

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateApr 1222 µg/m³Dec 1512 µg/m³
PM2.5 (µg/m³)Level
Jan14Moderate
Feb17Moderate
Mar22Moderate
Apr23Moderate
May21Moderate
Jun22Moderate
Jul21Moderate
Aug20Moderate
Sep17Moderate
Oct15Moderate
Nov14Moderate
Dec12Good
Location & terrain

Where is Bydgoszcz?

Bydgoszcz sits at 53.1°N, 18.0°E, 37 m above sea level, in Poland. The nearest listed city is Fordon, 11 km away.

InowrocławChełmżaTorunŚwiecie

Topography around Bydgoszcz

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

Within 3 km, the terrain around Bydgoszcz has only modest variations in elevation — a maximum elevation change of 55 m around an average of 59 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 101 m; within 80 km, only modest variations in elevation — a maximum elevation change of 215 m.

The land around Bydgoszcz is covered by artificial surfaces (60%) and trees (28%) within 3 km, trees (55%) within 16 km, and cropland (55%) and trees (32%) within 80 km.

3 km
55 m
16 km
101 m
80 km
215 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Fordon 11 km · Solec Kujawski 15 km · Nakło nad Notecią 27 km · Chełmno 37 km · Inowrocław 40 km · Chełmża 40 km · Torun 41 km · Świecie 43 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 Bydgoszcz (53.1235°, 18.0076°, elevation 37 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).