Parts of Scotland remain at risk of flooding despite the rain easing off.
River levels are continuing to rise and the ground is saturated, increasing the risk.
A Met Office yellow warning of rain was in place until 19:00 on Sunday and a further yellow warning has been issued for parts of western Scotland for Tuesday.
Two severe flood warnings were still in place on Sunday evening for parts of Perth and Aviemore.
The warning covered the North Inch area of Perth and the Dalfaber area of Aviemore.
The Scottish Environment Protection Agency (Sepa) says properties in basements and low-lying areas of North Inch are being flooded.
The Aviemore warning covers Dalfaber Road, Inverdruie, The Old Bridge Inn, Speyside Leisure Park and the sewage treatment works.
The railway line at Easter Kinakyle is also affected.
Apart from the two severe weather warnings, Sepa had 51 flood warnings and 11 flood alerts still in place on Sunday evening.
A Met Office Amber rain warning for some parts of the Highlands and north east of Scotland expired at 14:00.
Hours of heavy and persistent rain on Friday and Saturday caused major disruption around the country with some areas continuing to experience problems on Sunday.
Work has begun to clear the A83 after seven landslips blocked the vital road to Argyll and the Inner Hebrides on Saturday.
About 2,000 tonnes of debris fell on the road.
Ten people had to be airlifted from their vehicles on the A83 at the height of the bad weather.
The area around the Rest and Be Thankful saw a month's worth of rainfall, about 160mm (6in) fall over 36 hours. Bear Scotland said the catch pits and fences it installed had ensured that only a small amount of debris reached the road itself.
Road closures are in place between Inveraray and Tarbet due to landslides both sides of Dunoon junction. The diversion via A819/A85/A82 at A85 Dalmally is open.
The Western Ferries route from Gourock to Dunoon is running.
The Met Office said Tyndrum, west Perthshire, experienced the most rainfall on Saturday, with 112.6mm (4.4in) falling on the small village.
Police said on Saturday there had been no reports of injuries but they were treating the persistent heavy rain in parts of the west of Scotland as a "major incident".
In Aberfoyle, a warning was issued by NHS Forth Valley after a lorry overturned, spilling kerosene/diesel into the watercourse. It said kerosene had also leaked into the general floodwater which poses a potential threat to public health.
Health protection experts urged people to be extra careful if floodwater had entered their homes as there could be "significant health risks" to certain groups such as pregnant women, children, the elderly and those living with heart and lung conditions.
There following trunk roads are closed:
- The A84 between Kilmahog and Strathyre
- A92 at Letham
- A83 between Tarbet and Inveraray
- A828 between Connel and Ballachulish
- A85 at Loch Awe
ScotRail said disruption was continuing on Sunday with the following routes completely closed:
- West Highland Line between Glasgow and Oban/Fort William
- All services between Edinburgh and Perth, Dundee, Aberdeen, and Inverness
- All services between Glasgow and Perth, Dundee, Aberdeen, and Inverness
- All services between Kyle of Lochalsh and Inverness
ScotRail is advising customers not to travel as no rail replacement travel is available. Some other routes remain affected by speed restrictions as a safety precaution, meaning services may be subject to delay or cancellation.
The rail operator said the greatest risk to a normal restart on Monday was on the Highland Main Line and the Perthshire areas where floodwaters remain high. Passengers whose Monday journey runs between Perth and Inverness or Perth and Stirling are urged check before leaving home.
David Simpson, ScotRail service delivery director, said: "The weather we have seen over the weekend has been extreme and in some parts of the country we are continuing to see dangerous levels of rainfall and flooding.
"We appreciate that weather-related disruption like this can be frustrating, but our first priority has to be the safety of the public and our colleagues.
"Our staff across the country, alongside colleagues at Network Rail, are working hard to get services back to normal as quickly and safely as possible, with the priority being getting things back to normal for Monday morning.
"Customers are advised that they should check their journey before travelling, and keep an eye on our website, app, or social media feeds for live updates."
Ruth Ellis, Sepa's flood duty manager, said: "Today the focus turned to communities across the north, with a particular concern for severe flood impacts to communities along the Spey and Tay rivers.
"I want to be clear that communities in these areas should stay alert over the evening as some rivers will continue to rise over the course of the evening. The risk to life remains.
"It's been a difficult weekend across Scotland, with severe weather causing widespread travel disruption to road and rail networks and impacts in communities all over Scotland. Across many areas of the country there is still some deep standing water and it's really important people understand the danger.
"Hazards can be hidden, so please don't walk or drive into flood water. Remember that not only is flood water likely to be dirty, 30cm of fast flowing water can move an average family sized car, and just 15cm of fast-flowing water could be enough to knock you off your feet.
"We'll be continuing to issue further updates across the evening to communities across northern Scotland and our advice remains for people to keep up to date with information from sepa.org.uk and follow guidance from emergency services."
Following a meeting of the Scottish government's Resilience Room on Sunday, Home Affairs Secretary Angela Constance said: "The rainfall we have seen over Scotland this weekend has been extreme, causing significant disruption -particularly in the west and north of the country.
"These impacts are ongoing, and I want to put on record my thanks to all the staff and volunteers responding across the country.
"The flooding risk remains a key concern over the next few hours and days, with extremely high river levels and saturated ground."
She added: "Our multi-agency response teams stand ready and prepared to respond to any flooding incidents. Some local councils have also set up rest centres in their areas.
"The priority is now to restore normality as far as possible by Monday morning. I would, however, urge anyone planning to travel over the next few days to do so with caution."
On Saturday no cross border trains ran and ScotRail cancelled dozens of services and also cut short its scheduled timetable.
Ian Stewart, Bear Scotland's north west representative, said: "This extreme weather has caused widespread disruption, with Argyll significantly affected.
"Our teams are beginning clear-up operations to return full access to residents of Argyll, but conditions are still difficult, and we need to ensure that those on site are safe. As such, it is unlikely the A83 will reopen today.
"We are also continuing to work as part of the Argyll and Bute Resilience Partnership to assess road closures and incidents in the area."
The A83 has proved to be especially vulnerable to landslips and closures and in recent years calls have grown for a permanent solution to make the road more resilient to bad weather.
At almost 100 miles (161km) long, the road connects the Mull of Kintyre and southern Argyll to the shores of Loch Lomond. About 1.3 million vehicles use the route every year.
The closures can leave motorists facing long detours while the route is cleared.
Transport Scotland is planning to build a mile-long open-sided tunnel on the road, on the mountain pass known as the Rest and Be Thankful. The project is expected to cost up to £470m.
Posting on X, the social media site formerly known as Twitter, the former Argyll MSP Michael Russell said: "The amount and rate of rainfall here in Argyll & Bute in the last 24 hours has been astonishing.
"However, that aside it is concerning that slips are on this stretch which is not the area where most of the major problems have previously occurred."
An Argyll and Bute Council spokeswoman said: "We are working with our partner agencies, including Police Scotland, the HSCP (Health and Social Care Partnership) and others, to respond to the impact of this weekend's weather in Argyll and Bute.
"We have well established partnership arrangements for supporting vulnerable people and have put them into action. Actions have included for example preparing a rest centre yesterday in Lochgilphead for people potentially stranded because of road closures, although this ultimately was not needed.
"There are road closures across the area because of landslips, flooding or other impacts, and advice remains to not travel in Argyll and Bute.
"We have road crews out across the area to continue work today to clear debris on the road network where possible and to assess the impact of weather conditions, and the recovery work needed.
"Many people in our communities also took action to help and we would like to thank everyone involved for their efforts."
In the south of the UK, sunshine and highs of about 25C (77F) were forecast by the Met Office for Sunday.
Tom Morgan, a Met Office meteorologist, said the contrasting weather was caused by warm weather travelling up from France meeting cold weather coming from the north with the temperature contrast leading to the heavy rain in Scotland.
The warm weather in southern parts was expected to last until Tuesday.