The seasons in Ostrava are extreme; you can basically experience very cold winters with snow but also extremely hot summers with lots of sunshine.
Spring (March, April, May)
Ostrava flourishes in spring. This begins in the second half of March when temperatures rise above freezing, the snow starts to melt, and the first flowers appear. At the beginning of March, temperatures can still sometimes drop a bit below freezing. April in the Czech Republic is quite unpredictable and can change from sunny to snowy in a matter of minutes. It can also get windy and temperatures can vary quite a bit. Finally, in May the weather becomes quite consistently sunny and warm, with average temperatures at 15 – 25°C (60 – 77°F) during the day.
Main events in spring include St. Patrick’s Day in March, the Easter Markets in April, and Czech Valentine’s Day in May.
Summer (June, July, August)
Lately, summer has been getting warmer and warmer in the Czech Republic’s capital, and you have a high chance of enjoying some very sunny and even tropical days during Ostrava’s holiday season. The average temperatures are 16°C (61°F) in June, 17°C (63°F) in July and 18.5°C (65°F) in August. These numbers of course only describe the average temperatures, the highs (during the day) are usually much higher and often exceed 25°C (77°F).
Ostrava’s main attractions in summer are long walks, and many open air festivals like Colours of Ostrava
Fall/Autumn (September, October, November)
Autumn in Ostrava is very beautiful and colourful. The weather starts to cool down in September, when summer is slowly turning into autumn. At the beginning of this season, the average temperatures start at 16°C (61°F), cooling down to 5,5°C (42°F) in October, and getting to -1°C (30°F) in November with the approach of winter.
Winter (December, January, February)
Ostrava gets quite cold during winter, but you need to be a bit lucky to find it covered in pure white snow, since the average precipitation is at its lowest during the winter months. The temperatures are usually between 2°C (36°F) and -2°C (28°F) in December. It gets colder in January, when the temperatures sometimes drop even to -10°C (14°F), and the weather is quite similar in February.
Major events in Winter include the Christmas Markets, Saint Nicholas Day, and New Year’s Celebrations in December, and Valentine’s Day in February.