Sunday in Seattle was warm, but far from record-breaking — the temperature reached 23°C. That contrasts with the historic heat wave in April 2016, when thermometers climbed to 32°C. Forecasters predict Monday will be nearly identical, with a high around 22°C.
However, by Tuesday, in classic Seattle fashion, temperatures are expected to drop to 15–16°C with a chance of showers that could continue into Wednesday. By Thursday the situation should improve again: dry and sunny weather with comfortable temperatures around 19–20°C is expected through the end of the week. Overall, residents can expect a fairly moderate and changeable week typical for this time of year.
Based on: Seattle weather: Showers coming, with more sunshine on the horizon