April to May and September to October are the best months to visit Uzbekistan. Temperatures at these times of year are very pleasant, and rainfall minimal. You’ll be able to breakfast on a sunny terrace under clear blue skies in the mornings and walk around comfortably in mid-afternoon. Night times can be chilly in the desert regions by October, but an extra blanket will always be available.
From mid-June through August, the thermometer frequently climbs to well above 40 degrees in the daytime – think Spain at the height of summer. The heat can be particularly intense in Bukhara, and tends to be humid in Tashkent.