SeasonMapKarlovy Vary weather in September
Czechia
September in Karlovy Vary: nice, a little rain, with clean air — an excellent time to visit.
#4 of 12 months in Karlovy Vary · #553 of 1383 destinations to visit in September · comfort 84/100 (tier A)
Updated September 2026 · climate normals from ERA5 reanalysis
Traveller notes on Karlovy Vary in September
Notes from nearby Prague (111 km away)
Karlovy Vary doesn't have its own notes for September yet — these are about Prague, close enough to share the season.
Prague's September, per the forum: sunny and bright, still warm by day without being roasting — highs near 21°C — but chilly at night once lows drop to about 12, and variable enough that some days arrive cloudy and wet. The real reason regulars pick it is the crowd curve, not the thermometer: the peak tourist season is over by early autumn and late September into October is noticeably calmer, though nobody pretends Prague is ever tourist-free. September also carries a dense run of music, dance, food and art festivals.
Add your own note from Karlovy Vary's card on the map.
Karlovy Vary climate normals — September
| Daytime high | 19°C / 67°F | 😎 nice |
|---|---|---|
| Nighttime low | 11°C / 51°F | |
| Rainfall | 61 mm / 2.4 in | 🌦 some rain |
| Rainy days | 10 days | |
| Humidity | 78% | 💦 very humid |
| Dew point | 11°C / 52°F | |
| Sunshine | 8.6 h/day | |
| Daylight | 12.6 h | |
| Wind | 13 km/h / 8 mph | |
| Air quality (US AQI) | 40 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Karlovy Vary in September
How busy the place itself is — school and mass holidays, the months an editor tagged, and how sought-after the weather makes them. Never part of the comfort score.
Shoulder seasonschool holidays in 3 of the markets that fill it, an ordinary month(estimated)
Peak crowdsBusyShoulder seasonQuiet
Best months for Karlovy Vary's weather
Ranked by this destination's own climate comfort score across the year — a different thing from how busy it gets (see Crowds above).
Fair weatherKarlovy Vary's weather peaks June–August, best around July.
Best weatherFair weatherToughest weather
What's on in Karlovy Vary in September
Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.
- Festival
Dvorak Autumn
5–30 Sep · usuallyMajor festivalA month of classical concerts in September, alongside a jazz week and a folklore weekend. September is the quietly good month here: the valley in colour and no festival crush. Source ↗
Nearby, and something's on
Within 300 km of Karlovy Vary — a day trip or a short hop — with something on this month. Never part of the comfort score.
Where is Karlovy Vary?
Karlovy Vary in September — FAQ
- Is September a good time to visit Karlovy Vary?
- September in Karlovy Vary: nice, a little rain, with clean air — an excellent time to visit. It ranks #4 of 12 months for Karlovy Vary on SeasonMap's comfort score (84/100).
- What is the weather like in Karlovy Vary in September?
- In September, Karlovy Vary averages a daily high of 19.4°C and a low of 10.7°C, with about 60.6 mm of rain over roughly 9.8 rainy days.
- What is the air quality in Karlovy Vary in September?
- Karlovy Vary has a mean US Air Quality Index of about 40 in September.
Other months in Karlovy Vary
Warmer or cooler than Karlovy Vary in September
Similar destinations in Central Europe — September
Within 300 km: Prague's Mushroom season around 1 Aug – 31 Oct, and Munich's Oktoberfest on 19 Sep – 4 Oct.