| NWS Forecast for: Middle Chehalis River Valley Issued by: National Weather Service Seattle, WA Last Update: 237 PM PDT Mon May 18 2026 | |
| Tonight: Partly cloudy in the evening then becoming mostly cloudy. Patchy fog late in the night. Lows in the 40s. West wind 10 to 15 mph decreasing to 10 mph or less after midnight. Gusts to 25 mph. Tuesday: Mostly cloudy. Patchy fog in the morning. Highs in the 60s to lower 70s. Light wind becoming west to 10 mph with gusts to 20 mph in the afternoon. Tuesday Night: Mostly cloudy. Lows in the mid to upper 40s. West wind to 10 mph. Gusts to 20 mph in the evening. Wednesday: Mostly cloudy in the morning then becoming mostly sunny. Highs in the upper 60s to mid 70s. Light wind. Wednesday Night: Partly cloudy. Patchy fog after midnight. Lows in the lower to mid 40s. West wind around 10 mph in the evening becoming light. Thursday: Mostly sunny. Highs near 80. Thursday Night: Partly cloudy. Lows in the upper 40s. Friday: Partly sunny. Highs in the mid to upper 70s. Friday Night: Partly cloudy. Lows in the upper 40s. Saturday: Partly sunny. Highs in the lower to mid 70s. Saturday Night: Partly cloudy. Lows in the mid 40s. Sunday: Partly sunny. Highs in the mid to upper 60s. Sunday Night: Mostly cloudy with a chance of rain. Lows in the lower to mid 40s. Memorial Day: Mostly cloudy with a chance of rain. Highs in the mid 60s. | |
| Zone Forecast: Middle Chehalis River Valley | |
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