Weather is only one factor, but it can really affect your travel plans, especially if you are planning a longer stay in Naj' Hammadi. The hottest months are usually August and July, with an average temperature of 33°C, while the coldest months are January and December, with an average of 18°C. Between January and March, the daytime average is 29°C and the night-time average is 9°C. Between April and June, temperatures average 41°C during the day and 19°C at night. Between July and September, the temperature averages 41°C during the day and 25°C at night. Between October and December, the average temperature is 35°C during the day and 11°C at night.