The best months to visit British Indian Ocean Territory are August and July. See monthly temperatures, rainfall and rain days (1991–2020 averages) to plan your trip.
Average daytime high and monthly rainfall in British Indian Ocean Territory: January 29°C / 338mm; February 29°C / 259mm; March 29°C / 213mm; April 29°C / 160mm; May 29°C / 139mm; June 28°C / 108mm; July 28°C / 109mm; August 28°C / 99mm; September 28°C / 200mm; October 28°C / 232mm; November 28°C / 226mm; December 28°C / 275mm.