BEIRUT—Syrian Kurdish forces defending Kobani were again repelling a wave of Islamic State attacks Sunday as the besieged city awaited reinforcements from Iraqi Kurdistan.

Islamic State launched a fresh round of assaults to the south and the east of Kobani on Saturday night after a short period of calm Friday, according to a local government official and the Syrian Observatory for Human Rights, a monitoring group.

The two sides were still clashing Sunday morning as Islamic State called on reinforcements from cities surrounding Kobani to shore up its attack, according to Idris Nassan, the deputy foreign minister of the Kobani regional government.

“They’ve been trying their hardest to make progress,” Mr. Nassan said by phone on Sunday.

A deployment of 150 Iraqi Kurdistan forces, known as the Peshmerga, will travel to Kobani on Monday with heavy weaponry and ammunition to reinforce the city, Kurdish news agency Rudaw reported.