Karlovy Vary: The Timeless Elegance of a Premier Spa Town
Karlovy Vary, a historic spa town in Bohemia known for its elegant 19th-century architecture, famous hot springs, and rich cultural heritage.
September in Karlovy Vary brings moderate temperatures around 18°C (64°F) during the day, dropping to 8°C (46°F) at night, with quite a bit of rainfall expected, averaging around 67 mm (2.6 in) for the month.
Should you favor a climate that's both dry and comfortably warm, June, July and August typically offer the most agreeable circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.
Pick a month to see the average temperature, rainfall and sunshine in Karlovy Vary - and find the best time to visit.
50-year average (1976-2025)
Based on our historical records, temperatures in Karlovy Vary typically drop from around 18°C (64°F) at the start of September to approximately 14°C (57°F) by the end. Nights are cold, with lows typically ranging from 5°C (41°F) to 9°C (48°F).
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Browse day-by-day weather records for Karlovy Vary spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
The extremes listed below come from historical weather data collected in Karlovy Vary from 1976 through 2026.
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 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).
Pleasant temperatures in September mean you can pack light but flexibel pieces. Think cotton t-shirts, comfortable walking shorts, and one warmer layer for evenings. A light sweater or denim jacket works well. Rain gear is recommended, you can expect wet weather on multiple days. Sunglasses could come in handy during the sunnier parts of your trip.
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Temperature Rainfall Sunshine Humidity
See the full Karlovy Vary climate overview or explore weather in Czech Republic.
Where to go in September - average daytime high across popular destinations.
Need travel inspiration? Check out our bucket list articles and be inspired.
Karlovy Vary: The Timeless Elegance of a Premier Spa Town
Karlovy Vary, a historic spa town in Bohemia known for its elegant 19th-century architecture, famous hot springs, and rich cultural heritage.
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