Chomutov weather in September

In September, Chomutov sees average daytime highs of 18°C and overnight lows near 9°C, with 53 mm of rain across 9.6 wet days and about 12.4 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 22% of the time in September, and the air most often feels dry.

Daylight stretches from about 13 h 18 min at the start of September to 11 h 30 min by month's end. Set against the rest of the year, September is Chomutov's 4th-clearest and 9th-windiest month. For the whole year in context, see Chomutov's year-round climate.

Daytime high
18°
4th warmest
Overnight low
9th coldest
Rainfall
53 mm
9.6 wet days
Daylight
12 h 24 min
5:49 AM – 6:12 PM
Cloud cover
64%
4th clearest
Wind
9 km/h
9th windiest
Solar energy
3.14 kWh/m²
Travel score
5.6
out of 10

Chomutov is town in Czechia.

Air quality
Good
PM10 19.3 µg/m³ · 2019
Density
1,599/km²
people per km²
Founded
1252

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 Chomutov 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 12°C and 24°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
42010
51910
61910
71910
81910
91910
101910
111810
12189
13189
14189
15189
16189
17179
18178
19178
20178
21178
22178
23168
24168
25168
26167
27167
28167
29157
30157

How September really feels in Chomutov

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.

Chomutov 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°4310.67.18.30.0
Feb / -3°338.65.49.70.0
Mar / -0°45114.311.50.9
Apr13° / 399.91.313.53.4
May17° / 6012.5015.25.2
Jun21° / 11°7113016.15.8
Jul23° / 13°8113.5015.86.2
Aug23° / 13°7112.2014.36.5
Sep18° / 539.6012.45.6
Oct12° / 4710.30.510.42.9
Nov / 439.12.78.80.5
Dec / -2°4410.167.90.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 22% 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 62%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14060
24060
33961
44060
53961
63961
74159
84159
94159
104159
114159
124159
134159
144060
154060
164060
174060
184060
193862
203862
213763
223763
233664
243565
253565
263466
273367
283367
293268
303268

Chance of precipitation in September

Any precipitation

Chomutov gets around 53 mm of rain over 9.6 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 37% on the wettest days.

0%10%20%30%40%50%151015202530
Rain chance (%)
137
237
337
436
536
636
735
835
935
1034
1133
1233
1332
1432
1531
1631
1731
1831
1930
2030
2130
2230
2330
2430
2531
2631
2732
2833
2934
3034

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 91% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
178193
279183
381172
482162
583152
685141
785141
886131
987121
1087121
1188111
1289101
139091
149280
159280
169370
179460
189460
199550
209550
219640
229640
239730
249730
259730
269820
279820
289820
299820
309820

Wind in September

Winds average 9 km/h in September.

Across September, daily wind ranges from about 9 km/h on the calmest days to 10 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
110calm
210calm
310calm
410calm
510calm
610calm
710calm
810calm
910calm
1010calm
1110calm
1210calm
1310calm
1410calm
1510calm
169calm
179calm
189calm
199calm
209calm
219calm
229calm
239calm
249calm
259calm
269calm
279calm
289calm
299calm
3010calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 13 h 18 min at the start of September to 11 h 30 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 108 minutes over September. Sunrise moves from 5:26 AM to 6:12 AM, and sunset from 6:46 PM to 5:40 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.35:266:46
213.35:276:44
313.25:296:42
413.15:316:39
513.15:326:37
613.05:346:35
713.05:356:33
812.95:376:30
912.85:386:28
1012.85:406:26
1112.75:426:23
1212.65:436:21
1312.65:456:19
1412.55:466:17
1512.45:486:14
1612.45:496:12
1712.35:516:10
1812.25:536:07
1912.25:546:05
2012.15:566:03
2112.05:576:00
2212.05:595:58
2311.96:015:56
2411.96:025:53
2511.86:045:51
2611.76:055:49
2711.76:075:46
2811.66:095:44
2911.56:105:42
3011.56:125:40

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.14 kWh/m².

For context, solar energy here swings from a low near 0.7 kWh/m² to a high of 5.37 kWh/m² in June across the year — September's 3.14 kWh/m² falls in the middle.

01234151015202530
Solar energy (kWh/m²)Level
13.8Moderate
23.7Moderate
33.7Moderate
43.6Moderate
53.6Moderate
63.6Moderate
73.5Moderate
83.5Moderate
93.4Moderate
103.4Moderate
113.4Moderate
123.3Moderate
133.3Moderate
143.2Moderate
153.2Moderate
163.1Moderate
173.1Moderate
183.0Moderate
193.0Moderate
203.0Moderate
212.9Moderate
222.9Moderate
232.8Moderate
242.8Moderate
252.7Moderate
262.7Moderate
272.6Moderate
282.6Moderate
292.5Moderate
302.5Moderate
Planning a trip in September

Is September a good time to visit Chomutov?

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

5.6
Sightseeing
4th-best month of the year
1.7
Beach & pool
4th-best month of the year

September is a reasonable time to visit Chomutov for sightseeing.

What to pack for Chomutov in September

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

In September, Chomutov sees daytime highs around 18°C and nights near 9°C. Worth packing: rain gear. About 10 days see rain.

rain gear

UV index in Chomutov 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 Chomutov peaks around June 21 at about 7 (very high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near December 22 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 7 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highHighModerateLowJun 21UV 7Dec 22UV 1
UV index (midday)Level
Jan1Low
Feb2Low
Mar4Moderate
Apr4Moderate
May6High
Jun7Very high
Jul7High
Aug6High
Sep4Moderate
Oct2Moderate
Nov1Low
Dec1Low

Air quality in Chomutov 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 Chomutov is worst in April — around 21 µg/m³ PM2.5 (moderate), and holds fairly steady the rest of the year.

Modeled monthly averages (CAMS reanalysis, 2015–2024).

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateApr 1321 µg/m³Dec 1414 µg/m³
PM2.5 (µg/m³)Level
Jan16Moderate
Feb16Moderate
Mar20Moderate
Apr21Moderate
May18Moderate
Jun20Moderate
Jul18Moderate
Aug19Moderate
Sep18Moderate
Oct16Moderate
Nov15Moderate
Dec13Moderate
Location & terrain

Where is Chomutov?

Chomutov sits at 50.5°N, 13.4°E, 340 m above sea level, in Czechia. The nearest listed city is Jirkov, 5.0 km away.

MarienbergLounyAnnaberg-Buchholz

Topography around Chomutov

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

Within 3 km, the terrain around Chomutov has only modest variations in elevation — a maximum elevation change of 243 m around an average of 352 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 864 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,205 m.

The land around Chomutov is covered by trees (39%) and artificial surfaces (26%) within 3 km, trees (41%), cropland (29%) and grassland (22%) within 16 km, and trees (46%) and cropland (32%) within 80 km.

3 km
243 m
16 km
864 m
80 km
1,205 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Jirkov 5.0 km · Kadaň 14 km · Most 16 km · Žatec 17 km · Litvínov 21 km · Marienberg 28 km · Louny 29 km · Annaberg-Buchholz 32 km

Czechia travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type C / E
230 V · 50 Hz
Prices
≈ 59% of US
price level, 2025
GDP per capita
$35,917
2025
Happiness
6.8 / 10
World Happiness, 2025
Safe drinking water
98%
of population, 2024
Homicide rate
0.8
per 100k, 2023
Road deaths
5.9
per 100k/yr, 2019
Income group
High
World Bank
English
High
EF EPI 582
Religion
none 48%believers unaffiliated with a religious society 9%Roman Catholic 7%other believers belonging to a church or religious society 6%

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 Chomutov (50.4605°, 13.4178°, elevation 340 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).