The best months to visit Guinea-Bissau are December and November. See monthly temperatures, rainfall and rain days (1991–2020 averages) to plan your trip.
Average daytime high and monthly rainfall in Guinea-Bissau: January 35°C / 0mm; February 38°C / 1mm; March 39°C / 0mm; April 39°C / 0mm; May 38°C / 6mm; June 34°C / 86mm; July 30°C / 345mm; August 29°C / 446mm; September 29°C / 306mm; October 31°C / 141mm; November 33°C / 23mm; December 32°C / 2mm.