Hajnówka weather in September

In September, Hajnówka sees average daytime highs of 18°C and overnight lows near 9°C, with 59 mm of rain across 9.4 wet days and about 12.4 hours of daylight. It is the 5th-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 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 Hajnówka's 6th-clearest and 8th-windiest month. For the whole year in context, see Hajnówka's year-round climate.

Daytime high
18°
5th warmest
Overnight low
9th coldest
Rainfall
59 mm
9.4 wet days
Daylight
12 h 24 min
5:08 AM – 5:32 PM
Cloud cover
65%
6th clearest
Wind
13 km/h
8th windiest
Solar energy
2.93 kWh/m²
Travel score
5.6
out of 10

Hajnówka is city and urban gmina of Poland.

Air quality
Elevated
PM2.5 21.8 µg/m³ · 2016
Density
1,041/km²
people per km²
Founded
1650

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 Hajnówka reaches about 18°C in the afternoon and slips back to 9°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 6°C cooler than August and about 6°C warmer than October.

10°20°30°151015202530
Avg high (°C)Avg low (°C)
12111
22011
32010
42010
52010
62010
71910
81910
91910
10199
11199
12189
13189
14189
15189
16188
17178
18178
19178
20178
21178
22178
23167
24167
25167
26167
27167
28157
29157
30157

How September really feels in Hajnówka

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.

Hajnówka weather by month

How September compares with the rest of the year at a glance. September is the 5th-warmest and 5th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan-1° / -5°39107.27.90.0
Feb / -5°369.36.79.50.0
Mar / -2°4110.24.211.50.5
Apr13° / 489.81.313.63.5
May19° / 7011.90.115.55.7
Jun22° / 11°7112016.56.2
Jul24° / 14°8213.1016.16.4
Aug23° / 13°6710.6014.56.7
Sep18° / 599.4012.45.6
Oct11° / 489.80.610.32.9
Nov / 399.33.38.50.3
Dec / -3°42105.87.50.0

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 18% of September, with mostly cloudy or overcast conditions the remaining 61%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14060
24060
34060
43961
53961
64060
74060
83961
93961
103961
113961
123961
133961
143961
153961
163961
173961
183961
194060
203961
213961
223862
233862
243862
253763
263763
273763
283664
293664
303664

Chance of precipitation in September

Any precipitation

Hajnówka gets around 59 mm of rain over 9.4 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 34% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
134
234
334
433
533
633
733
833
932
1032
1132
1231
1331
1431
1530
1630
1730
1829
1929
2029
2129
2228
2328
2428
2528
2629
2729
2829
2929
3029

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 87% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
173234
275223
376213
477203
578193
680182
780182
881172
982162
1083152
1184142
1285132
1386122
1487112
1588102
1688102
178992
189082
199181
209271
219361
229361
239361
249451
259451
269550
279550
289550
299550
309640

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.

05101520151015202530
Wind speed (km/h)Feels
112calm
212calm
312light breeze
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
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 4:42 AM to 5:32 AM, and sunset from 6:09 PM to 4:58 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.54:426:09
213.44:436:07
313.34:456:04
413.24:476:02
513.24:495:59
613.14:505:57
713.04:525:54
813.04:545:52
912.94:565:50
1012.84:575:47
1112.84:595:45
1212.75:015:42
1312.65:035:40
1412.55:045:37
1512.55:065:35
1612.45:085:32
1712.35:105:30
1812.35:115:27
1912.25:135:25
2012.15:155:22
2112.15:175:20
2212.05:185:17
2311.95:205:15
2411.85:225:12
2511.85:245:10
2611.75:255:07
2711.65:275:05
2811.65:295:02
2911.55:315:00
3011.45:324:58

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 0.48 kWh/m² to a high of 5.49 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
23.6Moderate
33.5Moderate
43.5Moderate
53.4Moderate
63.4Moderate
73.3Moderate
83.3Moderate
93.2Moderate
103.2Moderate
113.1Moderate
123.1Moderate
133.1Moderate
143.0Moderate
153.0Moderate
162.9Moderate
172.9Moderate
182.8Moderate
192.8Moderate
202.7Moderate
212.7Moderate
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 Hajnówka?

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

5.6
Sightseeing
5th-best month of the year
1.8
Beach & pool
5th-best month of the year

September is a reasonable time to visit Hajnówka for sightseeing.

What to pack for Hajnówka in September

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

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

rain gear

UV index in Hajnówka 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 Hajnówka peaks around June 22 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 1 (low).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighModerateLowJun 22UV 6Dec 19UV 1
UV index (midday)Level
Jan1Low
Feb1Low
Mar3Moderate
Apr4Moderate
May5High
Jun6High
Jul6High
Aug6High
Sep4Moderate
Oct2Low
Nov1Low
Dec1Low

Air quality in Hajnówka 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 Hajnówka is worst in July — around 28 µg/m³ PM2.5 (moderate), about 2.0× the cleanest month (December, 14 µg/m³).

Seasonal pattern from CAMS reanalysis, scaled to Hajnówka's WHO annual average of 21.8 µg/m³.

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateJul 1227 µg/m³Dec 1614 µg/m³
PM2.5 (µg/m³)Level
Jan16Moderate
Feb20Moderate
Mar27Moderate
Apr27Moderate
May25Moderate
Jun27Moderate
Jul28Moderate
Aug25Moderate
Sep21Moderate
Oct17Moderate
Nov16Moderate
Dec14Moderate
Location & terrain

Where is Hajnówka?

Hajnówka sits at 52.7°N, 23.6°E, 162 m above sea level, in Poland. The nearest listed city is Bielsk Podlaski, 27 km away.

BiałystokŁapySiemiatyczePruzhanyBrestSokółkaVaukavysk

Topography around Hajnówka

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

Within 3 km, the terrain around Hajnówka has only modest variations in elevation — a maximum elevation change of 43 m around an average of 169 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 81 m; within 80 km, only modest variations in elevation — a maximum elevation change of 163 m.

The land around Hajnówka is covered by trees (36%), cropland (26%) and grassland (22%) within 3 km, trees (58%) and cropland (29%) within 16 km, and trees (42%) and cropland (38%) within 80 km.

3 km
43 m
16 km
81 m
80 km
163 m
treesgrasslandcroplandartificial surfaces
September weather nearby: Bielsk Podlaski 27 km · Białystok 52 km · Łapy 54 km · Siemiatycze 60 km · Pruzhany 63 km · Brest 71 km · Sokółka 74 km · Vaukavysk 74 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 Hajnówka (52.7433°, 23.5812°, elevation 162 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).