Chełm weather in September

In September, Chełm sees average daytime highs of 19°C and overnight lows near 9°C, with 63 mm of rain across 9.5 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 21°C in the first days to 16°C by the end. The sky is clear or mostly clear about 24% of the time in September, and the air most often feels dry.

Daylight stretches from about 13 h 24 min at the start of September to 11 h 24 min by month's end. Set against the rest of the year, September is Chełm's 6th-clearest and 8th-windiest month. For the whole year in context, see Chełm's year-round climate.

Daytime high
19°
5th warmest
Overnight low
9th coldest
Rainfall
63 mm
9.5 wet days
Daylight
12 h 24 min
5:09 AM – 5:32 PM
Cloud cover
64%
6th clearest
Wind
12 km/h
8th windiest
Solar energy
3.05 kWh/m²
Travel score
5.9
out of 10

Chełm is city with powiat rights in the Lublin Voivodeship in south-eastern Poland.

Air quality
Elevated
PM2.5 18.2 µg/m³ · 2019
Density
1,707/km²
people per km²
Founded
1237

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 21°C in the first days to 16°C by the end.

A typical September day in Chełm reaches about 19°C in the afternoon and slips back to 9°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 13°C and 25°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)
12211
22111
32111
42111
52111
62110
72010
82010
92010
102010
112010
121910
13199
14199
15199
16199
17189
18189
19188
20188
21188
22178
23178
24178
25178
26178
27167
28167
29167
30167

How September really feels in Chełm

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.

Chełm 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 / -5°369.66.38.20.0
Feb / -4°359.66.69.60.0
Mar / -1°4310.73.911.50.7
Apr14° / 479.71.113.53.9
May19° / 7212.7015.35.7
Jun22° / 12°7812.3016.26.2
Jul24° / 14°8613.1015.96.4
Aug24° / 13°669.9014.46.9
Sep19° / 639.5012.45.9
Oct13° / 479.50.410.43.4
Nov / 389.32.78.70.6
Dec / -3°389.45.87.80.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 24% 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 60%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14357
24258
34357
44357
54258
64258
74357
84357
94357
104159
114258
124258
134258
144159
154159
164060
174060
184060
193961
203862
213862
223862
233763
243565
253565
263565
273565
283565
293565
303466

Chance of precipitation in September

Any precipitation

Chełm gets around 63 mm of rain over 9.5 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 32% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
132
232
332
432
532
632
732
832
932
1032
1132
1232
1331
1431
1531
1631
1730
1830
1930
2030
2130
2230
2330
2430
2530
2630
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 84% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
171236
272226
374215
474215
576204
676204
777194
878193
979183
1080173
1181172
1282162
1383152
1483152
1585141
1686131
1786131
1887121
1987121
2088111
2189101
2289101
239190
249280
259280
269370
279370
289370
299370
309370

Wind in September

Winds average 12 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
112calm
212calm
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
1612light breeze
1712light breeze
1812light breeze
1912light 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 24 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 120 minutes over September. Sunrise moves from 4:45 AM to 5:32 AM, and sunset from 6:07 PM to 4:59 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.44:456:07
213.34:466:05
313.24:486:02
413.24:496:00
513.14:515:58
613.04:535:55
713.04:545:53
812.94:565:51
912.84:585:48
1012.84:595:46
1112.75:015:44
1212.65:025:41
1312.65:045:39
1412.55:065:37
1512.55:075:34
1612.45:095:32
1712.35:115:30
1812.35:125:27
1912.25:145:25
2012.15:155:22
2112.15:175:20
2212.05:195:18
2311.95:205:15
2411.85:225:13
2511.85:245:11
2611.75:255:08
2711.65:275:06
2811.65:295:04
2911.55:305:01
3011.45:324:59

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.05 kWh/m².

For context, solar energy here swings from a low near 0.6 kWh/m² to a high of 5.58 kWh/m² in June across the year — September's 3.05 kWh/m² falls in the middle.

01234151015202530
Solar energy (kWh/m²)Level
13.8Moderate
23.8Moderate
33.7Moderate
43.6Moderate
53.6Moderate
63.5Moderate
73.5Moderate
83.5Moderate
93.4Moderate
103.4Moderate
113.3Moderate
123.3Moderate
133.2Moderate
143.2Moderate
153.1Moderate
163.1Moderate
173.0Moderate
183.0Moderate
192.9Moderate
202.9Moderate
212.8Moderate
222.8Moderate
232.7Moderate
242.7Moderate
252.6Moderate
262.6Moderate
272.5Moderate
282.5Moderate
292.5Moderate
302.4Moderate
Planning a trip in September

Is September a good time to visit Chełm?

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
2.4
Beach & pool
5th-best month of the year

September is a reasonable time to visit Chełm for sightseeing.

What to pack for Chełm in September

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

In September, Chełm sees daytime highs around 19°C and nights near 9°C. Worth packing: rain gear. About 10 days see rain.

rain gear

UV index in Chełm 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 Chełm peaks around July 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 1 (low).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighModerateLowJul 18UV 6Dec 19UV 1
UV index (midday)Level
Jan1Low
Feb1Low
Mar3Moderate
Apr4Moderate
May5High
Jun6High
Jul7High
Aug6High
Sep4Moderate
Oct2Moderate
Nov1Low
Dec1Low

Air quality in Chełm 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 Chełm is worst in July — around 24 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (December, 11 µg/m³).

Seasonal pattern from CAMS reanalysis, scaled to Chełm's WHO annual average of 18.2 µg/m³.

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodJul 1224 µg/m³Dec 1711 µg/m³
PM2.5 (µg/m³)Level
Jan13Moderate
Feb16Moderate
Mar22Moderate
Apr21Moderate
May21Moderate
Jun23Moderate
Jul24Moderate
Aug21Moderate
Sep18Moderate
Oct14Moderate
Nov13Moderate
Dec11Good
Location & terrain

Where is Chełm?

Chełm sits at 51.1°N, 23.5°E, 177 m above sea level, in Poland. The nearest listed city is Krasnystaw, 27 km away.

ŁęcznaHrubieszówZamośćŚwidnikLublinNovovolynskVolodymyr-Volynskyi

Topography around Chełm

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

Within 3 km, the terrain around Chełm has only modest variations in elevation — a maximum elevation change of 66 m around an average of 192 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 126 m; within 80 km, significant variations in elevation — a maximum elevation change of 254 m.

The land around Chełm is covered by artificial surfaces (30%), trees (28%) and grassland (27%) within 3 km, cropland (49%) and trees (28%) within 16 km, and cropland (47%) and trees (35%) within 80 km.

3 km
66 m
16 km
126 m
80 km
254 m
treesgrasslandcroplandartificial surfaceswaterwetland
September weather nearby: Krasnystaw 27 km · Łęczna 45 km · Hrubieszów 48 km · Zamość 49 km · Świdnik 55 km · Lublin 64 km · Novovolynsk 67 km · Volodymyr-Volynskyi 68 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 Chełm (51.1431°, 23.4716°, elevation 177 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).