Alerts warning flooding is possible have been issued for the Severn/Vyrnwy confluence on the Shropshire border and for both rivers over the border in Wales.
It comes after the Met Office issued a warning for rain over the weekend for the west of the UK, including parts of Powys where flood waters drain into the upper Severn and Vyrnwy.
High river levels could caused flooding across the Welsh/English border into Shropshire around Llanymynech, Maesbrook and Melverley.
However any flooding is expected to be minor in comparison to the disruption seen throughout Shropshire last month.
A flood alert is also in place for the Upper Teme around the Ludlow, Church Stretton and Bishop's Castle areas, but none have yet been issued for the Severn from Shrewsbury down to Ironbridge and Bridgnorth.
Heavy rain was forecast in the UK until Sunday evening, although the worst of the downpours in Shropshire were expected to have finished by Saturday night.
Emergency response workers from Natural Resources Wales are at key sites, checking defences are in good working order and making sure any drainage grids and screens are clear to reduce the risk to people and their homes.
The agency urged anyone leaving home for an essential journey on the weekend to be careful if they encounter floodwater.
In total, six Met Office weather warnings covering mostly western areas from Scotland south to Plymouth are in place this weekend.
Rail services reported disruption on Saturday, mainly in Wales, as parts of the UK were hit by more than a month's worth of rain in a 26-hour period.
Natural Resources Wales had 23 flood warnings in place on Saturday, which advise immediate action, across the south of the country, on top of 41 flood alerts including those in Mid Wales.
The Environment Agency had issued 11 flood warnings and 96 flood alerts across England.
Senior meteorologist Marco Petagna said that, Sunday into Monday, the north and west of the country would see a “quieter spell” but there was more wet and windy weather to come in those regions on Tuesday and Wednesday, with some further weather warnings likely.