Overview: PärnuPärnu (Estonia) is a place with a mild continental climate. Temperatures during the day are in the range from -1 °C (29 °F) in February to 23 °C (73 °F) in July. Temperatures during the night go from -7 °C (19 °F) in February to 14 °C (57 °F) in July. The least rainy month in Pärnu is April with its 8 days of rain, the rainiest month is December, when it rains 13 days.