Chehalis Weather Forecast
- 51
- 66
Rain
- 47
- 70
Mostly Cloudy
- 47
- 71
Partly Sunny
- 49
- 79
Sunny
- 52
- 83
Mostly Sunny
- 52
- 85
Mostly Sunny
Today 13 Sep Lowlands of Lewis and Southern Thurston Counties
Becoming partly sunny late in the afternoon. Rain in the Morning, then a chance of rain early in the afternoon. A slight chance of rain late in the afternoon. Rainfall Amounts a quarter to a half inch possible. Highs in the 60s. South wind to 10 Mph becoming southwest around 10 Mph with Gusts to 20 Mph in the afternoon.
Tonight 13 Sep Lowlands of Lewis and Southern Thurston Counties
Mostly cloudy. Lows near 50. Southwest wind to 10 Mph becoming south after midnight. Gusts to 20 Mph.
Chehalis Temperature Statistics
September Temperature
Chehalis-Centralia Airport (1.2 miles)
Lowest 5 September, 2026
46.4 °FAverage September
59.9 °FHighest 9 September, 2026
82.4 °F
Climate (2021–2026)
Chehalis-Centralia Airport (1.2 miles)
Average Low 2021–2026
43.7 °FAverage 2021–2026
52 °FAverage High 2021–2026
61.3 °F