Bartoszyce weather in September

In September, Bartoszyce sees average daytime highs of 17°C and overnight lows near 9°C, with 56 mm of rain across 9.7 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 20°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 Bartoszyce's 6th-clearest and 7th-windiest month. For the whole year in context, see Bartoszyce's year-round climate.

Daytime high
17°
4th warmest
Overnight low
9th coldest
Rainfall
56 mm
9.7 wet days
Daylight
12 h 24 min
5:18 AM – 5:44 PM
Cloud cover
65%
6th clearest
Wind
13 km/h
7th windiest
Solar energy
2.86 kWh/m²
Travel score
5.5
out of 10

Bartoszyce is city and urban gmina of Poland.

Density
2,135/km²
people per km²
Founded
1240

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 15°C by the end.

A typical September day in Bartoszyce 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 5°C cooler than August and about 6°C warmer than October.

10°20°30°151015202530
Avg high (°C)Avg low (°C)
12011
22011
32011
41911
51911
61911
71910
81910
91910
101810
111810
121810
131810
14189
15189
16179
17179
18179
19179
20179
21178
22168
23168
24168
25168
26168
27168
28158
29157
30157

How September really feels in Bartoszyce

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.

Bartoszyce 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 / -4°45116.77.70.0
Feb / -4°389.65.69.30.0
Mar / -1°4410.2411.50.4
Apr12° / 4310.21.313.73.2
May17° / 6111.30.115.75.4
Jun20° / 11°7312.6016.85.8
Jul22° / 13°8413.1016.46.3
Aug22° / 13°7012014.76.4
Sep17° / 569.7012.55.5
Oct11° / 5410.60.310.22.8
Nov / 45102.48.20.4
Dec / -2°4510.45.47.20.0

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 17% of September, with mostly cloudy or overcast conditions the remaining 63%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14159
24159
34060
44060
53961
63961
73961
83862
93763
103763
113664
123664
133664
143664
153664
163565
173565
183664
193664
203664
213664
223763
233763
243763
253763
263763
273862
283763
293664
303664

Chance of precipitation in September

Any precipitation

Bartoszyce gets around 56 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 40% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%40%50%151015202530
Rain chance (%)
140
240
340
439
539
638
738
837
937
1036
1135
1234
1333
1432
1531
1631
1730
1829
1928
2028
2128
2228
2328
2428
2528
2629
2729
2830
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 84% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
167294
268284
369283
470273
571263
673243
774233
876222
977212
1079192
1180182
1281172
1382162
1483152
1584142
1686122
1788111
1888111
1989101
209091
219181
229280
239370
249370
259460
269460
279460
289550
299550
309550

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 14 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202530
Wind speed (km/h)Feels
112calm
212calm
312calm
412light breeze
512light breeze
612light breeze
712light breeze
812light breeze
912light breeze
1012light breeze
1112light breeze
1212light breeze
1312light breeze
1413light breeze
1513light 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
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 4:50 AM to 5:45 AM, and sunset from 6:23 PM to 5:08 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.54:506:23
213.54:526:20
313.44:546:18
413.34:566:15
513.24:586:12
613.25:006:10
713.15:016:07
813.05:036:05
913.05:056:02
1012.95:076:00
1112.85:095:57
1212.75:115:54
1312.75:135:52
1412.65:145:49
1512.55:165:47
1612.45:185:44
1712.45:205:41
1812.35:225:39
1912.25:245:36
2012.15:265:34
2112.15:285:31
2212.05:295:28
2311.95:315:26
2411.85:335:23
2511.85:355:21
2611.75:375:18
2711.65:395:15
2811.55:415:13
2911.55:435:10
3011.45:455:08

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 2.86 kWh/m².

For context, solar energy here swings from a low near 0.42 kWh/m² to a high of 5.42 kWh/m² in June across the year — September's 2.86 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
83.1Moderate
93.1Moderate
103.1Moderate
113.0Moderate
123.0Moderate
132.9Moderate
142.9Moderate
152.9Moderate
162.8Moderate
172.8Moderate
182.8Moderate
192.7Moderate
202.7Moderate
212.6Moderate
222.6Moderate
232.6Moderate
242.5Moderate
252.5Moderate
262.5Moderate
272.4Moderate
282.4Moderate
292.3Moderate
302.3Moderate
Planning a trip in September

Is September a good time to visit Bartoszyce?

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

5.5
Sightseeing
4th-best month of the year
1.6
Beach & pool
4th-best month of the year

September is a reasonable time to visit Bartoszyce for sightseeing.

What to pack for Bartoszyce in September

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

In September, Bartoszyce sees daytime highs around 17°C and nights near 9°C. Worth packing: rain gear. About 10 days see rain.

rain gear

Sea temperature near Bartoszyce 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 69 km away) is warmest in August at about 19°C and coldest in February near 2°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
Feb2Bracing
Mar3Bracing
Apr6Bracing
May10Bracing
Jun15Bracing
Jul18Cool
Aug19Cool
Sep16Cool
Oct12Bracing
Nov9Bracing
Dec6Bracing

UV index in Bartoszyce 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 Bartoszyce peaks around July 14 at about 6 (high) — a little sun protection helps at midday. 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.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighModerateLowJul 14UV 6Dec 20UV 0
UV index (midday)Level
Jan1Low
Feb1Low
Mar2Moderate
Apr4Moderate
May5Moderate
Jun6High
Jul6High
Aug5High
Sep4Moderate
Oct2Low
Nov1Low
Dec0Low
Location & terrain

Where is Bartoszyce?

Bartoszyce sits at 54.3°N, 20.8°E, 41 m above sea level, in Poland. The nearest listed city is Lidzbark Warmiński, 21 km away.

KętrzynGierłożKaliningradMrągowoOlsztynSvetlyyBraniewo

Topography around Bartoszyce

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

Within 3 km, the terrain around Bartoszyce has only modest variations in elevation — a maximum elevation change of 48 m around an average of 58 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 132 m; within 80 km, only modest variations in elevation — a maximum elevation change of 237 m.

The land around Bartoszyce is covered by cropland (41%), grassland (26%) and trees (20%) within 3 km, cropland (49%), trees (29%) and grassland (21%) within 16 km, and trees (37%), grassland (29%) and cropland (24%) within 80 km.

3 km
48 m
16 km
132 m
80 km
237 m
treesgrasslandcroplandartificial surfaceswaterwetland
September weather nearby: Lidzbark Warmiński 21 km · Kętrzyn 42 km · Gierłoż 49 km · Kaliningrad 54 km · Mrągowo 54 km · Olsztyn 56 km · Svetlyy 64 km · Braniewo 66 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 Bartoszyce (54.2535°, 20.8082°, elevation 41 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).