– Lat/Long: 47.51° N 121.74° W
Mount Si Weather Forecast
Cascade Range · United StatesIssued: 10 am Sun 11 Oct Local Time
Updates in:
Update imminent hr min s
Issued: 10 am Sun 11 Oct Local Time
Updates in:
Update imminent hr min s
2 Mount Si Elevations: 2 Forecast Elevations: Days 1–3 Weather SummaryMostly dry. Very mild (max 12°C on Mon afternoon, min 5°C on Sun morning). Wind will be generally light. | Days 4–6 Weather SummaryMostly dry. Warm (max 23°C on Fri afternoon, min 12°C on Wed morning). Wind will be generally light. | |||||||||||||||||
Sunday 11 | Monday 12 | Tuesday 13 | Wednesday 14 | Thursday 15 | Friday 16 | |||||||||||||
AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | |
 | |  | | |  |  | |  |  | | |  | | | | | | |
clear | clear | clear | clear | clear | some clouds | cloudy | cloudy | rain shwrs | light rain | cloudy | some clouds | some clouds | clear | clear | clear | clear | clear | |
Cloud base (m) | 2800 | 1850 | 2550 | 2300 | 2100 | 800 | 500 | 700 | 850 | 7850 | 8700 | 9650 | 8650 | |||||
km/h | ||||||||||||||||||
 |  |  |  |  |  | |||||||||||||
 cm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
mm | — | — | — | — | — | — | — | — | 0.1 | 0.4 | — | — | — | — | — | — | — | — |
max °C | 10 | 11 | 7 | 10 | 12 | 8 | 11 | 12 | 11 | 13 | 14 | 13 | 17 | 20 | 15 | 20 | 23 | 17 |
min °C | 5 | 11 | 6 | 6 | 12 | 7 | 9 | 12 | 10 | 12 | 13 | 12 | 12 | 20 | 13 | 13 | 21 | 14 |
chill °C | 4 | 10 | 6 | 6 | 12 | 7 | 9 | 12 | 10 | 12 | 13 | 12 | 12 | 20 | 12 | 12 | 21 | 14 |
Freezing level m | 1800 | 1950 | 2050 | 2500 | 3050 | 3200 | 2800 | 2750 | 2750 | 2950 | 3000 | 3500 | 3750 | 3850 | 3900 | 4050 | 3950 | 3900 |
 | 7:18 | — | — | 7:20 | — | — | 7:22 | — | — | 7:22 | — | — | 7:24 | — | — | 7:26 | — | — |
 | — | 6:27 | — | — | 6:24 | — | — | 6:22 | — | — | 6:21 | — | — | 6:19 | — | — | 6:16 | — |
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Mount Si Weather (Days 0-3):
The weather forecast for Mount Si is: Mostly dry. Very mild (max 12°C on Mon afternoon, min 5°C on Sun morning). Wind will be generally light.
Mount Si Weather (Days 3-6):
Mostly dry. Warm (max 23°C on Fri afternoon, min 12°C on Wed morning). Wind will be generally light.
This table gives the weather forecast for Mount Si at the specific elevation of 500 m. Our advanced weather models allow us to provide distinct weather forecasts for several elevations of Mount Si. To see the weather forecasts for the other elevations, use the tab navigation above the table. For a wider overview of the weather, consult the Weather Map of Washington.
| Weather Station | Temp. | Weather | Wind | Gusts | Cloud / Visibility |
|---|---|---|---|---|---|
 | |||||
| |||||
SHIP4352 | |||||
SHIP2097 | |||||
SHIP5525 | |||||
SHIP7006 | |||||
SHIP6818 | |||||
SHIP2594 |
* NOTE: not all weather observatories update at the same frequency which is the reason why some locations may show data from stations that are further away than known closer ones.
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