Heavy rain slowed across Nepal on Saturday night after causing widespread flooding and landslides. (AP PHOTO)

The death toll from flooding and landslides in Nepal has reached at least 100, with dozens of people still missing.

Police warned the death toll was expected to rise further as reports come in from villages across the mountainous country.

The weather in Nepal was improved on Sunday and rescue, recovery and clean-up efforts were under way.

Rescuer workers recovered 14 bodies overnight from two buses headed to Kathmandu that were buried in a landslide on a highway near the capital city.

At least one other bus and other vehicles remained buried at the same spot, and rescuer workers were digging through rocks and mud trying to find people.

Kathmandu remained cut off on Sunday as the main highways out of the city were blocked by landslides.

Three highways, including the key Prithvi highway that connects Kathmandu to the rest of the country, have been blocked by landslides.

Residents in the southern part of Kathmandu were cleaning up their houses as water levels began to recede.

At least 34 people were killed in Kathmandu, which was the hardest hit by Saturday’s flooding.

Police officers and soldiers were assisting with rescue efforts, while heavy equipment was used to clear the landslides from the roads.

The government closed schools and colleges across Nepal for the next three days.

The heavy rain, which started on Friday, slowed on Saturday night but was expected to continue through the weekend.

The government last week issued flood warnings across the Himalayan nation warning of massive rainfall.

Buses were banned from travelling at night on highways and people were discouraged from driving cars.

The monsoon season began in June and usually ends by mid-September.