With a population of around 21,500, El Jem sits in Mahdia Governorate, Tunisia. The city operates in the Africa/Tunis time zone.
In 2025, El Jem recorded an average annual temperature of 69°F. The hottest temperatures reached 116°F in July; the coolest were 40°F in December. Total precipitation for the year was 13 inches, with the wettest month being April.
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