The best months to visit Latvia are May and September. See monthly temperatures, rainfall and rain days (1991–2020 averages) to plan your trip.
Average daytime high and monthly rainfall in Latvia: January -4°C / 46mm; February 2°C / 39mm; March 7°C / 39mm; April 12°C / 42mm; May 19°C / 52mm; June 21°C / 73mm; July 23°C / 71mm; August 22°C / 80mm; September 21°C / 68mm; October 11°C / 80mm; November 5°C / 58mm; December 3°C / 49mm.