Chełm weather in September

In September, Chełm sees average daytime highs of 18°C and overnight lows near 9°C, with 54 mm of rain across 10.4 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 16°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 Chełm's 6th-clearest and 7th-windiest month. For the whole year in context, see Chełm's year-round climate.

Daytime high
18°
4th warmest
Overnight low
9th coldest
Rainfall
54 mm
10.4 wet days
Daylight
12 h 24 min
5:27 AM – 5:53 PM
Cloud cover
65%
6th clearest
Wind
15 km/h
7th windiest
Solar energy
2.93 kWh/m²
Travel score
5.4
out of 10

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 16°C by the end.

A typical September day in Chełm reaches about 18°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)
12011
22011
31911
41911
51911
61911
71911
81911
91810
101810
111810
121810
131810
141810
151810
16179
17179
18179
19179
20179
21179
22179
23168
24168
25168
26168
27168
28168
29158
30158

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 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°3810.25.77.70.0
Feb / -3°328.65.59.30.0
Mar / -1°4010.53.911.50.5
Apr12° / 429.8113.73.1
May17° / 6611.9015.75.1
Jun20° / 11°7513.1016.85.7
Jul22° / 13°9314016.46.1
Aug22° / 13°7712.5014.76.2
Sep18° / 5410.4012.55.4
Oct12° / 4710.20.210.23.0
Nov / 379.11.88.20.5
Dec / -2°4110.14.47.20.0

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 17% of September, with mostly cloudy or overcast conditions the remaining 62%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14159
24060
34060
43961
53862
63763
73763
83664
93664
103664
113664
123664
133664
143763
153763
163763
173763
183862
193862
203862
213862
223961
233862
243862
253862
263862
273862
283862
293763
303763

Chance of precipitation in September

Any precipitation

Chełm gets around 54 mm of rain over 10.4 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 35% and peaks near 45% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
145
245
345
445
544
644
743
842
941
1040
1139
1237
1336
1435
1533
1632
1731
1830
1929
2028
2128
2228
2328
2428
2528
2628
2729
2829
2930
3030

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 (%)
168275
270264
370264
471254
572244
674233
775223
876213
978202
1079192
1180182
1282162
1383152
1484142
1585132
1687121
1788111
1889101
199091
209181
219271
229271
239460
249460
259460
269460
279550
289550
299550
309550

Wind in September

Winds average 15 km/h in September.

Across September, daily wind ranges from about 14 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
114light breeze
214light breeze
314light breeze
414light breeze
514light breeze
614light breeze
714light breeze
814light breeze
914light breeze
1014light breeze
1114light breeze
1215light breeze
1315light breeze
1415light breeze
1515light breeze
1615light breeze
1715light breeze
1815light breeze
1915light breeze
2015light breeze
2115light breeze
2215light breeze
2315light breeze
2415light breeze
2515light breeze
2615light 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 4:59 AM to 5:53 AM, and sunset from 6:32 PM to 5:16 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.54:596:32
213.55:016:29
313.45:036:26
413.35:056:24
513.25:066:21
613.25:086:19
713.15:106:16
813.05:126:14
913.05:146:11
1012.95:166:08
1112.85:186:06
1212.75:196:03
1312.75:216:01
1412.65:235:58
1512.55:255:55
1612.45:275:53
1712.45:295:50
1812.35:315:48
1912.25:335:45
2012.15:345:42
2112.15:365:40
2212.05:385:37
2311.95:405:34
2411.85:425:32
2511.85:445:29
2611.75:465:27
2711.65:485:24
2811.55:505:21
2911.55:515:19
3011.45:535:16

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 0.44 kWh/m² to a high of 5.59 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
123.0Moderate
133.0Moderate
143.0Moderate
152.9Moderate
162.9Moderate
172.9Moderate
182.8Moderate
192.8Moderate
202.8Moderate
212.7Moderate
222.7Moderate
232.6Moderate
242.6Moderate
252.5Moderate
262.5Moderate
272.5Moderate
282.4Moderate
292.4Moderate
302.3Moderate
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).

5.4
Sightseeing
4th-best month of the year
1.6
Beach & pool
4th-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 18°C and nights near 9°C. Worth packing: rain gear. About 10 days see rain.

rain gear

Sea temperature near Chełm in September

The nearest coast averages about 17°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 17 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
May10Bracing
Jun14Bracing
Jul18Cool
Aug19Cool
Sep17Cool
Oct13Bracing
Nov9Bracing
Dec6Bracing

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 June 20 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.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighModerateLowJun 20UV 6Dec 20UV 0
UV index (midday)Level
Jan1Low
Feb1Low
Mar3Moderate
Apr4Moderate
May5Moderate
Jun6High
Jul6High
Aug5High
Sep4Moderate
Oct2Low
Nov1Low
Dec0Low
Location & terrain

Where is Chełm?

Chełm sits at 54.3°N, 18.6°E, 63 m above sea level, in Poland. The nearest listed city is Orunia Górna-Gdańsk Południe, 2.0 km away.

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 118 m around an average of 44 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 222 m; within 80 km, significant variations in elevation — a maximum elevation change of 339 m.

The land around Chełm is covered by artificial surfaces (45%) and trees (41%) within 3 km, trees (27%), cropland (24%) and water (20%) within 16 km, and trees (30%), water (29%) and cropland (27%) within 80 km.

3 km
118 m
16 km
222 m
80 km
339 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Orunia Górna-Gdańsk Południe 2.0 km · Ujeścisko-Łostowice 2.0 km · Gdansk 2.0 km · Środmieście 3.0 km · Piecki-Migowo 3.0 km · Wrzeszcz 4.0 km · Wrzeszcz Górny 5.0 km · Wrzeszcz Dolny 5.0 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 (54.3405°, 18.6193°, elevation 63 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).