Brandýs nad Labem-Stará Boleslav weather in September

In September, Brandýs nad Labem-Stará Boleslav sees average daytime highs of 20°C and overnight lows near 10°C, with 55 mm of rain across 8.8 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 22°C in the first days to 17°C by the end. The sky is clear or mostly clear about 25% 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 Brandýs nad Labem-Stará Boleslav's 4th-clearest and 9th-windiest month. For the whole year in context, see Brandýs nad Labem-Stará Boleslav's year-round climate.

Daytime high
20°
4th warmest
Overnight low
10°
9th coldest
Rainfall
55 mm
8.8 wet days
Daylight
12 h 24 min
5:45 AM – 6:07 PM
Cloud cover
62%
4th clearest
Wind
10 km/h
9th windiest
Solar energy
3.2 kWh/m²
Travel score
6.3
out of 10

Brandýs nad Labem-Stará Boleslav is town in the Czech Republic.

Air quality
Good
PM10 21.1 µg/m³ · 2019
Density
897/km²
people per km²
Founded
1960

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 22°C in the first days to 17°C by the end.

A typical September day in Brandýs nad Labem-Stará Boleslav reaches about 20°C in the afternoon and slips back to 10°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 14°C and 26°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)
12213
22212
32212
42212
52212
62112
72112
82112
92111
102111
112111
122011
132011
142011
152010
162010
171910
181910
191910
201910
211910
22199
23189
24189
25189
26189
27189
28179
29179
30179

How September really feels in Brandýs nad Labem-Stará Boleslav

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.

Brandýs nad Labem-Stará Boleslav 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 / -2°3810.14.38.30.0
Feb / -2°318.23.29.70.1
Mar / 4210.12.211.51.7
Apr15° / 358.90.413.54.4
May19° / 6111.4015.25.9
Jun23° / 13°7211.6016.16.4
Jul25° / 15°7612.4015.76.5
Aug25° / 14°6810.1014.36.8
Sep20° / 10°558.8012.46.3
Oct14° / 439.20.110.53.8
Nov / 409.21.28.81.0
Dec / -1°419.53.77.90.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 25% 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 59%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14555
24555
34456
44357
54456
64357
74357
84357
94258
104258
114258
124357
134258
144258
154258
164159
174159
184159
194159
204159
214159
224060
234060
244159
254060
263961
273961
283862
293763
303664

Chance of precipitation in September

Any precipitation

Brandýs nad Labem-Stará Boleslav gets around 55 mm of rain over 8.8 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 29% and peaks near 32% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
130
230
330
430
530
630
730
830
930
1029
1129
1229
1328
1428
1528
1628
1728
1828
1928
2028
2128
2228
2328
2429
2529
2630
2730
2831
2932
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 85% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
171227
272217
374206
474206
576195
677185
778184
878184
980173
1081163
1181163
1282153
1384142
1484142
1585132
1686122
1788111
1888111
1989101
209091
219091
229181
239370
249370
259460
269460
279550
289550
299550
309550

Wind in September

Winds average 10 km/h in September.

Across September, daily wind ranges from about 10 km/h on the calmest days to 11 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
1610calm
1710calm
1810calm
1910calm
2010calm
2110calm
2210calm
2310calm
2410calm
2510calm
2610calm
2710calm
2810calm
2910calm
3011calm

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 5:21 AM to 6:07 AM, and sunset from 6:41 PM to 5:35 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.35:216:41
213.35:236:39
313.25:246:36
413.15:266:34
513.15:276:32
613.05:296:30
712.95:316:27
812.95:326:25
912.85:346:23
1012.85:356:21
1112.75:376:18
1212.65:386:16
1312.65:406:14
1412.55:416:11
1512.45:436:09
1612.45:456:07
1712.35:466:04
1812.25:486:02
1912.25:496:00
2012.15:515:58
2112.05:525:55
2212.05:545:53
2311.95:565:51
2411.95:575:48
2511.85:595:46
2611.76:005:44
2711.76:025:42
2811.66:035:39
2911.56:055:37
3011.56:075:35

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.2 kWh/m².

For context, solar energy here swings from a low near 0.72 kWh/m² to a high of 5.46 kWh/m² in June across the year — September's 3.2 kWh/m² falls in the middle.

01234151015202530
Solar energy (kWh/m²)Level
13.9Moderate
23.8Moderate
33.8Moderate
43.7Moderate
53.7Moderate
63.6Moderate
73.6Moderate
83.5Moderate
93.5Moderate
103.5Moderate
113.4Moderate
123.4Moderate
133.3Moderate
143.3Moderate
153.3Moderate
163.2Moderate
173.2Moderate
183.1Moderate
193.1Moderate
203.0Moderate
213.0Moderate
222.9Moderate
232.9Moderate
242.9Moderate
252.8Moderate
262.8Moderate
272.7Moderate
282.7Moderate
292.6Moderate
302.6Moderate
Planning a trip in September

Is September a good time to visit Brandýs nad Labem-Stará Boleslav?

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

6.3
Sightseeing
4th-best month of the year
3.1
Beach & pool
4th-best month of the year

September is a reasonable time to visit Brandýs nad Labem-Stará Boleslav for sightseeing.

What to pack for Brandýs nad Labem-Stará Boleslav in September

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

In September, Brandýs nad Labem-Stará Boleslav sees daytime highs around 20°C and nights near 10°C. Worth packing: rain gear. About 9 days see rain.

rain gear

UV index in Brandýs nad Labem-Stará Boleslav in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 5 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Brandýs nad Labem-Stará Boleslav 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.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighHighModerateLowJun 21UV 7Dec 22UV 1
UV index (midday)Level
Jan1Low
Feb2Low
Mar4Moderate
Apr4Moderate
May6High
Jun7Very high
Jul7High
Aug6High
Sep5Moderate
Oct2Moderate
Nov1Low
Dec1Low

Air quality in Brandýs nad Labem-Stará Boleslav 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 Brandýs nad Labem-Stará Boleslav is worst in March — around 20 µg/m³ PM2.5 (moderate), and holds fairly steady the rest of the year.

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateMar 2320 µg/m³Dec 1113 µg/m³
PM2.5 (µg/m³)Level
Jan15Moderate
Feb16Moderate
Mar20Moderate
Apr20Moderate
May18Moderate
Jun19Moderate
Jul17Moderate
Aug18Moderate
Sep16Moderate
Oct14Moderate
Nov13Moderate
Dec13Moderate
Location & terrain

Where is Brandýs nad Labem-Stará Boleslav?

Brandýs nad Labem-Stará Boleslav sits at 50.2°N, 14.7°E, 186 m above sea level, in Czechia. The nearest listed city is Černý Most, 11 km away.

Topography around Brandýs nad Labem-Stará Boleslav

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Brandýs nad Labem-Stará Boleslav.

Within 3 km, the terrain around Brandýs nad Labem-Stará Boleslav has only modest variations in elevation — a maximum elevation change of 76 m around an average of 192 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 208 m; within 80 km, large variations in elevation — a maximum elevation change of 1,001 m.

The land around Brandýs nad Labem-Stará Boleslav is covered by cropland (45%) and trees (22%) within 3 km, cropland (53%) and trees (25%) within 16 km, and trees (40%) and cropland (40%) within 80 km.

3 km
76 m
16 km
208 m
80 km
1,001 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Černý Most 11 km · Letňany 12 km · Neratovice 13 km · Vysočany 14 km · Prosek 14 km · Střížkov 14 km · Libeň 16 km · Staré Strašnice 16 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 Brandýs nad Labem-Stará Boleslav (50.1871°, 14.6633°, elevation 186 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).