(Portland, OR) -- The National Weather Service has an Excessive Heat Watch posted Saturday through Monday from the Puget Sound through the Willamette Valley and along the coasts. Inland temperatures are expected to be in the low to mid 90s. It's rare to have a three day stretch of hot weather this early in the year. First responders are warning people heading to rivers and lakes to cool off that water temperatures remain very cold and river levels are high with spring run off. Swimmers should wear lifejackets and swim in pairs.