Two conservation authorities have now issued water safety advisories.
The Ausable Bayfield and Maitland Valley Conservation Authorities are warning about rainfalls and snow melting contributing to higher water levels in rivers and streams.
The advisory stretches along the coastline from Lambton Shores to Amberley, and inland between Arkona, Lucan, and Teviotdale.
Officials say weather conditions could lead to high stream flows in area waterways, with the largest rivers peaking in depth late Friday and into Saturday.
At this point, no major flooding is expected, but low-lying areas could see more water than others.
Advisories from both conservation authorities will expire Monday morning.