Janov nad Nisou Weather in September
With daytime temperatures of 18°C (64°F) and nighttime lows of 8°C (46°F), September in Janov nad Nisou brings moderate temperatures during the day. Do keep in mind that quite a bit of rainfall is typical. Around 90 mm (3.5 in) falls on average.
Rainfall in Janov nad Nisou in September
On average, there are about 13 days with rain during this month, averaging 90 mm (3.5 in). Expect a fairly normal spread of rainfall this month, with no particular pattern of very heavy or very persistent showers.
Temperature in Janov nad Nisou in September
Temperatures in Janov nad Nisou in September top out at 18°C (64°F) and drop to 8°C (46°F) overnight. Even when the weather is stable, mornings and evenings can still feel distinctly cool. With overnight lows of 8°C (46°F), nights are cold. The cold air does make for deep, comfortable sleep if you have enough blankets.So this is a great month to visit if you prefer dry days with pleasant temperatures.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Czech Republic, check out our Janov nad Nisou's climate page.
Janov nad Nisou Temperature in September
Min Temperature
8°C (46°F)
Max Temperature
18°C (64°F)
Chance of Rain
44%
Precipitation
90 mm (3.5 in)
Rainy days
13 days
Humidity
75% *
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Janov nad Nisou typically drop from around 19°C (66°F) at the start of September to approximately 16°C (61°F) by the end. Nights are cool, with lows typically ranging from 6°C (43°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 for Janov nad Nisou in September
Browse day-by-day weather records for Janov nad Nisou spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Janov nad Nisou historical weather extremes in September
Based on weather observations in Janov nad Nisou between 1976 and 2025, these are the recorded extremes during September.
- Janov nad Nisou recorded its highest September temperature of 31°C (88°F) on September 4, 2024.
- Janov nad Nisou experienced its chilliest September day on September 16, 2008, reaching only 7°C (45°F).
- The coldest night in September in Janov nad Nisou was on September 24, 2002, with a minimum of -3°C (27°F).
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
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What to Wear in Janov nad Nisou in September
For Janov nad Nisou in September, you'll want flexible clothing. It's wise to pack cotton shirts, comfortable shorts, and a pair of jeans for cooler evenings. A light sweater or jacket is useful for air-conditioned spaces (like buses) or unexpected cool moments. High rain levels are expected, so pack waterproof gear and an umbrella or poncho.What To Do in Janov nad Nisou in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Czech Republic, check out our Janov nad Nisou's climate page.
See the full Janov nad Nisou climate overview or explore weather in Czech Republic.
