The maximum temperature in Hamadan is on average 18°C over the year, with values generally ranging between 4°C in January and 33°C in July. Rains remain limited, with about 367 mm of precipitation per year. The driest month receives 1 mm in September, versus 66 mm in March for the wettest.
The weather is pleasant to stay to Hamadan in: May, June, July, August and September. However, the period when the weather is truly ideal is June, July, August and September.
For winter sports and snow, the best months are January, February and December.
For hiking and trekking, the best months are April, May and September.
In terms of crowd levels, the quietest periods are in February, while crowding is high in April, May, June, September, December, July and August.