The Czech Republic, of course, is not Siberia, but it will be cold in November. In the negative, the thermometer's column most likely will not crawl during the day, but piercing winds and general chilliness will reach the bones, so dress warmer. Saving can only be a proven pile of "Becherovka" (exclusively for health), along with a hot knee boar. A portion of a half a kilogram is able to throw the "firebox" in the body for at least 6 hours, checked.
November weather can turn into a complete trick: here you and ice, and frost, and snow, and heavy rain. But all this, as the weather forecasters say, "with a certain probability", so it's not worth much frightening. A pair of warm sweaters, a robust jacket, high-soled shoes and a charge of optimism are able to cope not with such vagaries of nature.
As for the temperature, in the daytime the column will be stable in the 0 ... + 6 ° С, at night still crawling to -3 ° C.