– Lat/Long: 47.51° N 121.74° W
Mount Si Weather Forecast
Cascade Range · United StatesIssued: 4 am Tue 13 Oct Local Time
Updates in:
Update imminent hr min s
Issued: 4 am Tue 13 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 15°C on Thu afternoon, min 6°C on Tue morning). Wind will be generally light. | Days 4–6 Weather SummaryModerate rain (total 18mm) heaviest on Sat morning, then becoming colder with a dusting of snow on Sun night. Very mild (max 16°C on Fri morning, min 2°C on Sun night). Winds decreasing (strong winds from the WSW on Sat morning, calm by Sat night). | |||||||||||||||||
Tuesday 13 | Wednesday 14 | Thursday 15 | Friday 16 | Saturday 17 | Sunday 18 | |||||||||||||
AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | |
 |  |  |  | |  |  | | | | |  |  |  | | | |  | |
cloudy | some clouds | cloudy | light rain | some clouds | clear | clear | clear | clear | clear | clear | rain shwrs | mod. rain | rain shwrs | rain shwrs | some clouds | some clouds | light snow | |
Cloud base (m) | 2000 | 1900 | 750 | 500 | 750 | 9000 | 450 | 700 | 1850 | 5850 | 4550 | 850 | ||||||
km/h | ||||||||||||||||||
 |  |  |  |  |  | |||||||||||||
 cm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 |
mm | — | — | — | 0.8 | — | — | — | — | — | — | — | 1.4 | 9 | 6 | 0.6 | — | — | 0.8 |
max °C | 6 | 7 | 7 | 8 | 9 | 11 | 14 | 15 | 15 | 16 | 16 | 12 | 6 | 4 | 4 | 7 | 7 | 5 |
min °C | 6 | 7 | 7 | 7 | 8 | 9 | 12 | 15 | 14 | 15 | 15 | 7 | 4 | 4 | 3 | 4 | 7 | 2 |
chill °C | 5 | 6 | 5 | 4 | 8 | 9 | 11 | 14 | 14 | 15 | 15 | 2 | -2 | -2 | -1 | 2 | 4 | -2 |
Freezing level m | 2950 | 2950 | 2950 | 3550 | 3700 | 3900 | 3900 | 3950 | 3950 | 3900 | 3650 | 3250 | 1900 | 1800 | 1850 | 2550 | 2250 | 1700 |
 | 7:22 | — | — | 7:22 | — | — | 7:24 | — | — | 7:26 | — | — | 7:28 | — | — | 7:28 | — | — |
 | — | 6:22 | — | — | 6:21 | — | — | 6:19 | — | — | 6:16 | — | — | 6:15 | — | — | 6:14 | — |
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Mount Si Weather (Days 0-3):
The weather forecast for Mount Si is: Mostly dry. Very mild (max 15°C on Thu afternoon, min 6°C on Tue morning). Wind will be generally light.
Mount Si Weather (Days 3-6):
Moderate rain (total 18mm) heaviest on Sat morning, then becoming colder with a dusting of snow on Sun night. Very mild (max 16°C on Fri morning, min 2°C on Sun night). Winds decreasing (strong winds from the WSW on Sat morning, calm by Sat night).
This table gives the weather forecast for Mount Si at the specific elevation of 1270 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 |
|---|---|---|---|---|---|
 | |||||
 | |||||
SHIP4767 | |||||
SHIP4088 | |||||
SHIP12656 | |||||
SHIP12220 | |||||
SHIP7118 | |||||
SHIP8936 | |||||
SHIP8551 |
* 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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