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Startup, WA Weather Forecast
Startup, WA Weather Forecast Date: 236 AM PDT Thu Sep 03 2026
The area/counties/county of: Cascades, including the cities of: Gold Bar, Monroe, Duvall, and Index.or toggle through each period.
Today... Mostly cloudy. A slight chance of showers in the morning, then a chance of showers and a slight chance of thunderstorms in the afternoon. Highs in the 60s. Southeast wind to 10 mph in the morning becoming light.
Tonight... Mostly cloudy. A slight chance of showers in the evening. Lows in the mid 40s to lower 50s. Light wind.
Friday... Mostly sunny. A slight chance of showers early in the afternoon. A slight chance of thunderstorms late in the afternoon. Highs in the mid to upper 60s. Light wind becoming northwest to 10 mph in the afternoon.
Friday Night... Mostly cloudy. A slight chance of showers in the evening. Lows near 50. Northeast wind to 10 mph in the evening becoming light.
Saturday... Partly sunny. A slight chance of thunderstorms in the afternoon. Highs in the mid 60s to lower 70s. Light wind.
Saturday Night... Mostly cloudy in the evening then becoming partly cloudy. Lows near 50.
Sunday... Mostly sunny. Highs in the lower to mid 70s.
Sunday Night... Partly cloudy. A slight chance of showers after midnight. Lows in the lower to mid 50s.
Labor Day... Mostly sunny with a slight chance of showers. Highs in the lower to mid 70s.
Monday Night... Partly cloudy. Lows in the lower to mid 50s.
Tuesday... Partly sunny. Highs in the lower to mid 70s.
Tuesday Night... Partly cloudy. Lows in the lower to mid 50s.
POP = Probability of Precipitation
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