Karlovy Vary Weather in September
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.
Rainfall in Karlovy Vary in September
Past climate data indicates that roughly 14 days will see rain, totalling around 67 mm (2.6 in) for the month. Expect a fairly normal spread of rainfall this month, with no particular pattern of very heavy or very persistent showers.
Temperature in Karlovy Vary in September
In September, expect moderate temperatures in Karlovy Vary, with highs of 18°C (64°F) and lows of 8°C (46°F) at night. Even when the weather is stable, mornings and evenings can still feel distinctly cool. With lows around 8°C (46°F), nights are cold. The upside is that cool, crisp nights are often the best for a deep sleep.
Sunshine in Karlovy Vary in September
The month experiences a moderate amount of sunlight, with 139 hours of sunshine. This provides a nice balance between sunshine and clouds.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.
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 Karlovy Vary's climate page.
Karlovy Vary Temperature in September
Min Temperature
8°C (46°F)
Max Temperature
18°C (64°F)
Chance of Rain
46%
Precipitation
67 mm (2.6 in)
Rainy days
14 days
Humidity
78% *
Sunshine
139 hours *
Percentage Sunshine
*
Daily Historical Temperatures
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).
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 Karlovy Vary in September
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.
Karlovy Vary historical weather extremes in September
The extremes listed below come from historical weather data collected in Karlovy Vary from 1976 through 2025.
- The warmest day in September was on September 1, 2009, with a maximum of 29°C (84°F).
- Nighttime temperatures dropped to -3°C (27°F) on September 18, 2008, 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
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What to Wear in Karlovy Vary in September
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.What To Do in Karlovy Vary 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 Karlovy Vary's climate page.
Temperature Rainfall Sunshine Humidity
See the full Karlovy Vary climate overview or explore weather in Czech Republic.
