– Lat/Long: 47.51° N 121.74° W
Mount Si Weather Forecast
Cascade Range · United StatesIssued: 4 am Mon 21 Sep Local Time
Updates in:
Update imminent hr min s
Issued: 4 am Mon 21 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 19°C on Mon morning, min 10°C on Tue night). Wind will be generally light. | Days 4–6 Weather SummaryHeavy rain (total 31mm), heaviest during Thu night. Very mild (max 16°C on Sat afternoon, min 6°C on Fri morning). Wind will be generally light. | |||||||||||||||||
Monday 21 | Tuesday 22 | Wednesday 23 | Thursday 24 | Friday 25 | Saturday 26 | |||||||||||||
AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | |
 |  |  |  |  | |  | | | |  |  | | |  | | |  | |
clear | some clouds | some clouds | light rain | rain shwrs | some clouds | cloudy | some clouds | some clouds | light rain | mod. rain | heavy rain | rain shwrs | rain shwrs | rain shwrs | clear | some clouds | light rain | |
Cloud base (m) | 9350 | 6250 | 450 | 9100 | 2400 | 2500 | 6700 | 2700 | 500 | 400 | 450 | 750 | 2000 | 9150 | 7050 | 2400 | ||
km/h | ||||||||||||||||||
 |  |  |  |  |  | |||||||||||||
 cm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
mm | — | — | — | 0.1 | 0.2 | — | — | — | — | 0.2 | 7 | 15 | 7 | 2 | 0.4 | — | — | 0.1 |
max °C | 19 | 18 | 14 | 12 | 16 | 12 | 14 | 16 | 12 | 12 | 11 | 10 | 9 | 12 | 10 | 13 | 16 | 12 |
min °C | 15 | 18 | 11 | 11 | 14 | 10 | 11 | 16 | 11 | 12 | 10 | 7 | 6 | 11 | 6 | 7 | 15 | 10 |
chill °C | 15 | 18 | 11 | 11 | 14 | 10 | 11 | 16 | 11 | 12 | 10 | 6 | 5 | 10 | 5 | 6 | 15 | 10 |
Freezing level m | 3850 | 3750 | 3600 | 3300 | 3000 | 2800 | 2850 | 2950 | 3200 | 2750 | 2850 | 2050 | 1700 | 2050 | 2250 | 2750 | 2900 | 2450 |
 | 6:50 | — | — | 6:52 | — | — | 6:54 | — | — | 6:54 | — | — | 6:56 | — | — | 6:58 | — | — |
 | — | 7:07 | — | — | 7:05 | — | — | 7:02 | — | — | 7:00 | — | — | 6:59 | — | — | 6:57 | — |
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Mount Si Weather (Days 0-3):
The weather forecast for Mount Si is: Mostly dry. Very mild (max 19°C on Mon morning, min 10°C on Tue night). Wind will be generally light.
Mount Si Weather (Days 3-6):
Heavy rain (total 31mm), heaviest during Thu night. Very mild (max 16°C on Sat afternoon, min 6°C on Fri 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 |
|---|---|---|---|---|---|
Renton Airport |  | ||||
Stampede Pass Airport | | ||||
SHIP4412 | |||||
SHIP9353 | |||||
SHIP6271 | |||||
SHIP5615 | |||||
SHIP7259 | |||||
SHIP7850 |
* 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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