Janske Lazne Weather in September
September in Janske Lazne sees daytime temperatures around 17°C (63°F) and lows of 8°C (46°F) at night. With around 82 mm (3.2 in) of rainfall expected, it's worth packing a rain jacket.
Rainfall in Janske Lazne in September
You can expect rain on around 13 days based on historical patterns, with 82 mm (3.2 in) average for the month. The rainfall pattern this month is fairly balanced. Showers tend to be moderate rather than extreme.
Temperature in Janske Lazne in September
If you're visiting Janske Lazne in September, expect highs of 17°C (63°F) and overnight lows around 8°C (46°F). A light jacket or extra layer can be useful, especially outside the warmest hours of the day. 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.
Sunshine in Janske Lazne in September
The month brings about 153 hours of sunlight, offering a comfortable mix of sun and overcast.If you prefer dry days with pleasant temperatures, June, July and August typically offer the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.
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 Janske Lazne's climate page.
Janske Lazne Temperature in September
Min Temperature
8°C (46°F)
Max Temperature
17°C (63°F)
Chance of Rain
42%
Precipitation
82 mm (3.2 in)
Rainy days
13 days
Humidity
81% *
Sunshine
153 hours *
Percentage Sunshine
*
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Janske Lazne typically drop from around 14°C (57°F) at the start of September to approximately 11°C (52°F) by the end. Nights are cold, with lows typically ranging from 4°C (39°F) to 7°C (45°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 Janske Lazne in September
Browse day-by-day weather records for Janske Lazne spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Janske Lazne historical weather extremes in September
Based on 49 years of weather observations in Janske Lazne between 1976 and 2025, these are the recorded extremes.
- On September 4, 2025, temperatures climbed to 29°C (84°F), marking the warmest September day on record.
- Janske Lazne registered its coldest September night on September 27, 1977, with temperatures dropping to -4°C (25°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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tolerable
unpleasant
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What to Wear in Janske Lazne in September
For Janske Lazne 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. Bring sunglasses since you'll have some sunny periods throughout the monthWhat To Do in Janske Lazne 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 Janske Lazne's climate page.
Temperature Rainfall Sunshine Humidity
See the full Janske Lazne climate overview or explore weather in Czech Republic.
