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Mladá Boleslav Weather in September
September in Mladá Boleslav sees daytime temperatures around 20°C (68°F) and lows of 10°C (50°F) at night. With around 63 mm (2.5 in) of rainfall expected, it's worth packing a rain jacket.
Rainfall in Mladá Boleslav in September
This month experiences about 12 days of rain according to historical data, averaging 63 mm (2.5 in). Neither particularly heavy nor particularly frequent, the rain this month is about average. A light jacket should be enough on most wet days.
Temperature in Mladá Boleslav in September
If you're visiting Mladá Boleslav in September, expect excellent temperatures with highs of 20°C (68°F) and overnight lows of 10°C (50°F). A light jacket or extra layer can be useful, especially outside the warmest hours of the day. Nights cool down to 10°C (50°F), so a light jacket or extra layer is useful once the sun goes down. On the plus side, the cooler nights make for comfortable sleeping conditions.Our weather planner can help you find worldwide destinations with pleasant weather during this period. May, June, July, August and September typically offer the best weather for Mladá Boleslav.
Mladá Boleslav Temperature in September
Min Temperature
10°C (50°F)
Max Temperature
20°C (68°F)
Chance of Rain
40%
Precipitation
63 mm (2.5 in)
Rainy days
12 days
Humidity
75% *
* Data from: Liberec, Czech Republic (41 KM, 25 Miles).
Mladá Boleslav Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Mladá Boleslav - and find the best time to visit.
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Mladá Boleslav typically drop from around 20°C (68°F) at the start of September to approximately 17°C (63°F) by the end. Nights are cool, with lows typically ranging from 7°C (45°F) to 11°C (52°F).
Average temperatures in September
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather records for Mladá Boleslav in September
Browse day-by-day weather records for Mladá Boleslav spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Mladá Boleslav historical weather extremes in September
Based on 50 years of weather observations (1976-2026), these are the most extreme conditions recorded in Mladá Boleslav.
- The hottest September day on record in Mladá Boleslav reached 33°C (91°F) (September 4, 2024).
- The coldest September day was on September 19, 1977, with a maximum of 7°C (45°F).
- Nighttime temperatures dropped to 0°C (32°F) on September 26, 1977, marking the coldest September night on record.
Best Places in Czech Republic in September
Find out more about the weather in Czech Republic and which places have the best travel conditions in this month. See all of Czech Republic in September →
perfect weather
pleasant
tolerable
unpleasant
poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
What to Wear in Mladá Boleslav in September
Comfortable temperatures call for an easy wardrobe in September. Pack summer basics like t-shirts and shorts, but include a light jacket for cooler moments. A pair of comfortable walking shoes is essential. Wet weather is likely, so pack waterproof gear for multiple rainy days.
What To Do in Mladá Boleslav in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Cycling10/10 -
Walking10/10 -
Camping8/10 -
Outdoor sports10/10
Mladá Boleslav 3-Day Forecast
More climate data for Mladá Boleslav
See the full Mladá Boleslav climate overview or explore weather in Czech Republic.
Popular in September
Where to go in September - average daytime high across popular destinations.
Prague
20°C (68°F) Brno21°C (70°F) Mariánské Lázně
19°C (66°F) Český Krumlov18°C (64°F) Karlovy Vary
18°C (64°F) Harrachov17°C (63°F) Rokytnice nad Jizerou17°C (63°F) Špindlerův Mlýn17°C (63°F) Bucket list
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