Chiba Prefecture Mobara has a humid subtropical climate (Köppen Cfa) characterized by warm summers and cool winters with light to no snowfall.

The town of Mobara was created during the early Meiji period establishment of the modern municipalities system on April 1, 1889 in Chōsei District.

The Bōsō Tetsudo, now the JR Sotobō Line, was established in 1897 between Ichinomiya and Ōami Station in present-day Ōamishirasato.

A base for the 252 Air Group of the Imperial Japanese Navy (IJN), a fighter aircraft unit, was established in Mobara.

[5] In 1941, by order of the IJN, 100 residences and their associated farmland, schools, town halls, police substations, temples, and shrines were forcibly confiscated without warning to build the base.

Tokubetsu kōgekitai, or kamikaze units, were sent from Mobara Airfield to the IJN Kokubu Air Corps in present-day Kirishima, Kagoshima Prefecture to attack American forces off Okinawa.

[6][7] At the end of World War II, the 113th Cavalry Regiment of the United States Army occupied the Mobara Airfield.

[6] On April 1, 1952, Mobara Town expanded by annexation of neighboring villages of Tōgō, Toyoda, Ninomiya-Hongō, Tsurue, and Gogō and was elevated to city status.

[8] Mobara has a mayor-council form of government with a directly elected mayor and a unicameral city council of 22 members.

JR East – Sotobō Line A popular annual event in Mobara is the Tanabata festival, during which a wide array of stalls and parades dominate much of the city's central shopping district.