– Lat/Long: 47.51° N 121.74° W
Mount Si Weather Forecast
Cascade Range · United StatesIssued: 4 am Fri 18 Sep Local Time
Updates in:
Update imminent hr min s
Issued: 4 am Fri 18 Sep 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 Sun morning, min 11°C on Fri morning). Wind will be generally light. | Days 4–6 Weather SummaryMostly dry. Very mild (max 12°C on Mon morning, min 6°C on Wed night). Wind will be generally light. | |||||||||||||||||
Friday 18 | Saturday 19 | Sunday 20 | Monday 21 | Tuesday 22 | Wednesday 23 | |||||||||||||
AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | |
 | |  | | | | | | |  | |  |  | | | | | | |
clear | clear | clear | clear | clear | clear | clear | clear | clear | some clouds | clear | some clouds | cloudy | clear | clear | cloudy | some clouds | some clouds | |
Cloud base (m) | 9500 | 9250 | 8650 | 8700 | 8500 | 7150 | 6350 | 7400 | 5650 | 6900 | ||||||||
km/h | ||||||||||||||||||
 |  |  |  |  |  | |||||||||||||
 cm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
max °C | 12 | 13 | 12 | 13 | 14 | 14 | 15 | 15 | 15 | 12 | 11 | 10 | 9 | 9 | 8 | 9 | 10 | 8 |
min °C | 11 | 12 | 12 | 12 | 14 | 13 | 14 | 15 | 12 | 11 | 11 | 9 | 9 | 8 | 7 | 8 | 9 | 6 |
chill °C | 11 | 12 | 12 | 12 | 14 | 13 | 14 | 15 | 12 | 11 | 11 | 9 | 8 | 7 | 6 | 8 | 9 | 5 |
Freezing level m | 3800 | 3800 | 3850 | 3850 | 3900 | 4050 | 4000 | 4000 | 3900 | 3650 | 3650 | 3850 | 3500 | 3250 | 3200 | 3100 | 2800 | 3050 |
 | 6:47 | — | — | 6:48 | — | — | 6:50 | — | — | 6:50 | — | — | 6:52 | — | — | 6:54 | — | — |
 | — | 7:13 | — | — | 7:10 | — | — | 7:08 | — | — | 7:07 | — | — | 7:05 | — | — | 7:02 | — |
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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 Sun morning, min 11°C on Fri morning). Wind will be generally light.
Mount Si Weather (Days 3-6):
Mostly dry. Very mild (max 12°C on Mon morning, min 6°C on Wed night). Wind will be generally light.
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 |
|---|---|---|---|---|---|
 | |||||
| |||||
SHIP6670 | |||||
SHIP10597 | |||||
SHIP3503 |  |
* 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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