Bytów weather in September

In September, Bytów sees average daytime highs of 17°C and overnight lows near 9°C, with 62 mm of rain across 10.7 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 19% 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 Bytów's 6th-clearest and 8th-windiest month. For the whole year in context, see Bytów's year-round climate.

Daytime high
17°
4th warmest
Overnight low
9th coldest
Rainfall
62 mm
10.7 wet days
Daylight
12 h 24 min
5:32 AM – 5:57 PM
Cloud cover
66%
6th clearest
Wind
14 km/h
8th windiest
Solar energy
2.8 kWh/m²
Travel score
5.2
out of 10

Bytów is city of Poland.

Density
1,918/km²
people per km²
Founded
1150

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 Bytów 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
51911
61811
71810
81810
91810
101810
111810
121810
131710
14179
15179
16179
17179
18179
19179
20169
21169
22168
23168
24168
25168
26158
27158
28158
29158
30157

How September really feels in Bytów

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.

Bytów 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°5211.367.70.0
Feb / -3°4310.35.79.40.0
Mar / -1°5010.84.211.50.4
Apr12° / 419.81.213.73.0
May17° / 6711.60.115.75.1
Jun19° / 10°7913016.85.7
Jul21° / 13°9813.8016.46.0
Aug21° / 13°8013.5014.66.0
Sep17° / 6210.7012.55.2
Oct12° / 5611.50.210.22.8
Nov / 45102.28.20.5
Dec / -2°5311.65.47.20.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 19% 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 65%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
13961
23961
33862
43763
53763
63664
73565
83565
93466
103466
113466
123466
133367
143367
153367
163466
173466
183466
193466
203565
213565
223664
233664
243664
253664
263664
273664
283565
293664
303565

Chance of precipitation in September

Any precipitation

Bytów gets around 62 mm of rain over 10.7 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 36% and peaks near 46% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
146
245
345
444
544
643
742
841
940
1039
1138
1237
1336
1435
1534
1633
1732
1831
1931
2030
2130
2231
2331
2431
2532
2632
2733
2833
2934
3035

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 84% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
167285
269274
370264
471254
572244
674233
775223
876213
977203
1079192
1181172
1282162
1383152
1484142
1586131
1687121
1788111
1889101
199091
209091
219280
229370
239370
249370
259460
269460
279460
289460
299460
309550

Wind in September

Winds average 14 km/h in September.

Across September, daily wind ranges from about 13 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
113light breeze
213light breeze
313light breeze
413light 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
1714light breeze
1814light breeze
1914light breeze
2014light breeze
2114light breeze
2214light breeze
2314light breeze
2414light breeze
2514light breeze
2614light 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 5:04 AM to 5:58 AM, and sunset from 6:36 PM to 5:21 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.55:046:36
213.55:066:33
313.45:076:31
413.35:096:28
513.25:116:26
613.25:136:23
713.15:156:21
813.05:176:18
912.95:196:15
1012.95:206:13
1112.85:226:10
1212.75:246:08
1312.75:266:05
1412.65:286:02
1512.55:306:00
1612.45:325:57
1712.45:335:55
1812.35:355:52
1912.25:375:49
2012.15:395:47
2112.15:415:44
2212.05:435:42
2311.95:455:39
2411.85:465:36
2511.85:485:34
2611.75:505:31
2711.65:525:29
2811.55:545:26
2911.55:565:23
3011.45:585:21

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 2.8 kWh/m².

For context, solar energy here swings from a low near 0.42 kWh/m² to a high of 5.36 kWh/m² in June across the year — September's 2.8 kWh/m² falls in the middle.

01234151015202530
Solar energy (kWh/m²)Level
13.5Moderate
23.4Moderate
33.3Moderate
43.3Moderate
53.2Moderate
63.2Moderate
73.1Moderate
83.1Moderate
93.0Moderate
103.0Moderate
113.0Moderate
122.9Moderate
132.9Moderate
142.9Moderate
152.8Moderate
162.8Moderate
172.7Moderate
182.7Moderate
192.7Moderate
202.6Moderate
212.6Moderate
222.5Moderate
232.5Moderate
242.5Moderate
252.4Moderate
262.4Moderate
272.3Moderate
282.3Moderate
292.3Moderate
302.2Moderate
Planning a trip in September

Is September a good time to visit Bytów?

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 Bytów for sightseeing.

What to pack for Bytów in September

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

In September, Bytów 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 Bytów 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 64 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°10°20°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshing
Sea temperature (°C)Comfort
Jan4Bracing
Feb3Bracing
Mar3Bracing
Apr5Bracing
May9Bracing
Jun14Bracing
Jul17Cool
Aug19Cool
Sep16Cool
Oct13Bracing
Nov9Bracing
Dec6Bracing

UV index in Bytów 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 Bytów 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
May5High
Jun6High
Jul6High
Aug5High
Sep4Moderate
Oct2Low
Nov1Low
Dec0Low
Location & terrain

Where is Bytów?

Bytów sits at 54.2°N, 17.5°E, 122 m above sea level, in Poland. The nearest listed city is Kościerzyna, 32 km away.

LęborkSłupskKartuzyChojniceUstkaWejherowoOsowa

Topography around Bytów

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

Within 3 km, the terrain around Bytów has only modest variations in elevation — a maximum elevation change of 122 m around an average of 156 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 198 m; within 80 km, significant variations in elevation — a maximum elevation change of 339 m.

The land around Bytów is covered by trees (32%), cropland (29%) and grassland (24%) within 3 km, trees (56%) and cropland (20%) within 16 km, and trees (49%) and cropland (26%) within 80 km.

3 km
122 m
16 km
198 m
80 km
339 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Kościerzyna 32 km · Lębork 44 km · Słupsk 44 km · Kartuzy 49 km · Chojnice 53 km · Ustka 61 km · Wejherowo 68 km · Osowa 70 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 Bytów (54.1706°, 17.4919°, elevation 122 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).