Displaced Palestinians are reeling after heavy rains flooded their tents in makeshift displacement camps in Gaza City, as the United Nations warns that Israeli restrictions on aid have left hundreds of thousands of families without adequate shelter.

Abdulrahman Asaliyah, a displaced Palestinian man, told Al Jazeera on Friday that residents’ mattresses, clothes and other belongings were soaked in the flooding.

“We are calling for help, for new tents that can at least protect people from the winter cold,” he said, explaining that nearly two dozen people had been working for hours to get the water to drain from the area.

“This winter rain is a blessing from God, but there are families who no longer wish for it to fall, fearing for the lives of their children and their own survival,” Asaliyah said.

Gaza’s civil defence agency said Friday’s flooding primarily affected Palestinians in the north of the Strip, where hundreds of thousands of people have returned following last month’s ceasefire agreement between Israel and Hamas.

Flooding was also reported in central Gaza’s Deir el-Balah, said the rescue agency, which urged the international community to do more to “address the suffering” of Palestinians whose homes were destroyed in Israel’s two-year war on the enclave.

“We urge the swift delivery of homes, caravans, and tents to these displaced families to help alleviate their suffering, especially as we are at the beginning of winter,” it said in a statement.

While the October 10 ceasefire has allowed more aid to get into the Gaza Strip, the UN and other humanitarian groups say Palestinians still lack adequate food, medicine and other critical supplies, including shelter.

Aid groups working to provide shelter assistance in the occupied Palestinian territory said in early November that about 260,000 Palestinian families, totalling almost 1.5 million people, were vulnerable as the cold winter months approached.

The UN agency for Palestinian refugees (UNRWA) said this week that it has enough shelter supplies to help as many as 1.3 million Palestinians.

But UNRWA said Israel continues to block its efforts to bring aid into Gaza despite the ceasefire deal, which stipulated that humanitarian assistance must be delivered to Palestinians in need.

“We have a very short chance to protect families from the winter rains and cold,” Angelita Caredda, Middle East and North Africa director at the Norwegian Refugee Council (NRC), said in a statement on November 5.

Reporting from Deir el-Balah on Friday, Al Jazeera’s Hind Khoudary said Palestinians across Gaza have been voicing fears that this winter would be particularly difficult due to the lack of safe shelter.

“It only rained for a couple of minutes – 30 minutes or so … [and] they were completely flooded,” she said. “Their tents are very fragile and worn-out; they have been using them for the past two years.”

She added that most Palestinians do not have any other options but to remain in tent camps or overcrowded shelters, despite the difficulties.

“We’re already seeing Palestinian children walking barefoot. They do not have winter clothes. They do not have blankets. And at the same time, the aid that is coming in … is being restricted,” Khoudary said.

Back in Gaza City, another displaced Palestinian man affected by the heavy rains, Abu Ghassan, said he and his family “no longer have a normal life”.

“I’m lifting the mattresses so the children don’t get soaked,” he told Al Jazeera. “But the little ones were already drenched here. We don’t even have proper tents.”