Cesky Krumlov weather by month
Cesky Krumlov runs from about 0°C in January to 21°C in August, with September the wettest month at 217 mm.
warmest month
August
21°C
coolest month
January
0°C
wettest month
September
217 mm
worst air month
December
14 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 0°C | 100 mm | 140 h | 14 |
| February | 6°C | 55 mm | 141 h | 12 |
| March | 8°C | 38 mm | 254 h | 14 |
| April | 11°C | 44 mm | 295 h | 9 |
| May | 15°C | 120 mm | 310 h | 6 |
| June | 18°C | 77 mm | 355 h | 5 |
| July | 20°C | 101 mm | 369 h | 4 |
| August | 21°C | 73 mm | 353 h | 6 |
| September | 15°C | 217 mm | 231 h | 5 |
| October | 11°C | 49 mm | 201 h | 6 |
| November | 4°C | 40 mm | 150 h | 9 |
| December | 2°C | 55 mm | 143 h | 14 |
About 2,942 hours of sun a year. Roughly 98 rainy days a year.
These are long-run climate normals, not a forecast. A given year can sit well outside them. PM2.5 is a global model: near the coast it counts sea salt as fine particulate and reads high against ground stations, sometimes by a factor of two. Use the shape of the year, not the absolute number.
where these numbers come from
- · Temperature, rainfall and sunshine: ECMWF ERA5 reanalysis climate normals via Open-Meteo (CC BY 4.0), fetched once and stored.
- · PM2.5: Copernicus CAMS reanalysis, monthly means. Modelled, not station readings; near coasts CAMS counts sea salt as PM2.5 and reads high.
Last reviewed 2026-05-25. Full method, licences and the list of sources we rejected are on the methodology page.