Yes
you do need a jacket based on the weather in Mount St. Helens National Volcanic Monument, 3029 Spirit Lake Hwy, Castle Rock, WA 98611, USA 1 second ago
Why? Because sorry, it's too cool for just a hoodie!
55°F13°C & Partly Cloudy
Wind is 5 mph8 km/h from the West, gusting to 9 mph14 km/h
| September 18 | ||||
| 1am | 54°F12°C | 5 mph9 km/h West | Mostly Cloudy | |
| 2am | 54°F12°C | 5 mph8 km/h West | Mostly Cloudy | |
| 3am | 53°F12°C | 5 mph7 km/h Northwest | Cloudy | |
| 4am | 53°F12°C | 5 mph7 km/h West | Cloudy | |
| 5am | 53°F11°C | 4 mph7 km/h West | Mostly Cloudy | |
| 6am | 52°F11°C | 5 mph7 km/h Southwest | Mostly Cloudy | |
| 7am | 52°F11°C | 4 mph7 km/h Northwest | Mostly Cloudy | |
| 8am | 52°F11°C | 4 mph7 km/h Northwest | Partly Cloudy | |
| 9am | 51°F11°C | 4 mph7 km/h Northwest | Partly Cloudy | |
| 10am | 51°F10°C | 5 mph8 km/h Northwest | Partly Cloudy | |
| 11am | 52°F11°C | 5 mph8 km/h Northwest | Mostly Clear | |
| 12pm | 54°F12°C | 5 mph8 km/h Northwest | Mostly Clear | |
| Date | Low | High | Wind | Day | Night |
|---|---|---|---|---|---|
| September 17 | 53°F12°C | 68°F20°C | 5 mph8 km/h from West | Clear | Mostly Cloudy |
| September 18 | 51°F10°C | 65°F19°C | 5 mph9 km/h from Northwest | Mostly Clear | Clear |
| September 19 | 54°F12°C | 73°F23°C | 3 mph5 km/h from Northwest | Clear | Clear |
| September 20 | 50°F10°C | 67°F19°C | 4 mph7 km/h from West | Mostly Clear | Rain |
| September 21 | 49°F10°C | 57°F14°C | 5 mph8 km/h from West | Rain | Partly Cloudy |
| September 22 | 47°F8°C | 66°F19°C | 2 mph4 km/h from Southwest | Mostly Clear | Clear |
| September 23 | 54°F12°C | 74°F23°C | 4 mph6 km/h from Southeast | Clear | Partly Cloudy |
Yes
Low of 51°F11°C, High of 65°F19°CWind: 5 mph9 km/h
Precipitation: None