The best months to visit Guatemala are February and January. See monthly temperatures, rainfall and rain days (1991–2020 averages) to plan your trip.
Average daytime high and monthly rainfall in Guatemala: January 22°C / 5mm; February 22°C / 4mm; March 26°C / 9mm; April 26°C / 28mm; May 30°C / 84mm; June 26°C / 146mm; July 24°C / 76mm; August 24°C / 88mm; September 25°C / 139mm; October 22°C / 110mm; November 21°C / 29mm; December 20°C / 8mm.