The best months to visit Finland are July and August. See monthly temperatures, rainfall and rain days (1991–2020 averages) to plan your trip.
Average daytime high and monthly rainfall in Finland: January -2°C / 50mm; February -3°C / 42mm; March 1°C / 37mm; April 7°C / 37mm; May 13°C / 44mm; June 17°C / 71mm; July 21°C / 75mm; August 20°C / 76mm; September 15°C / 58mm; October 8°C / 63mm; November 3°C / 63mm; December 0°C / 57mm.