Aid agencies have reiterated calls for Israel to allow more tents and urgently needed supplies into Gaza after the first heavy winter rainfall, saying more than a quarter of a million families need emergency help with shelters.
We are going to lose lives this winter. Children, families will perish, says Jan Egeland, Secretary General of the Norwegian Refugee Council (NRC).
It's actually so frustrating that we've now lost so many crucial weeks since the adoption of the Trump peace plan, which said humanitarian aid would flow and the Palestinians would not needlessly continue to suffer.
With a majority of the population displaced by two years of a devastating war, most Gazans now live in tents - many of them makeshift.
They have been clearing up after widespread flooding due to a winter storm that began on Friday.
There are fears that diseases could spread as rainwater has mixed with sewage water.
My children are already sick and look at what happened to our tent, said Fatima Hamdona, crying in the rain over the weekend, as she showed a BBC freelance journalist the ankle-deep puddle inside her temporary home in Gaza City.
We don't have food - the flour got all wet. We're people who've been destroyed. Where do we go? There's no shelter for us to go to now.
The story was the same in the southern city of Khan Younis.
Our clothes, mattresses and blankets were flooded, said Nihad Shabat, as she tried to dry out her possessions there on Monday.
Her family has been sleeping inside a shelter made of sheets and blankets.
According to the NRC, about 260,000 Palestinian families, or about 1.5 million people, are in need of emergency shelter assistance, lacking the basics to get through winter.
They say they have been able to get only about 19,000 tents into Gaza since the US-brokered Israel-Hamas ceasefire took effect on 10 October.
Jan Egeland blames what he calls a bureaucratic, military, politicised quagmire running counter to all humanitarian principles for the hold-up.
Many tents have become available on the black market in Gaza, where prices have dropped significantly, yet accessibility remains a critical issue for the most vulnerable families, leading to urgent pleas for more international assistance.
