– Lat/Long: 47.51° N 121.74° W
Mount Si Weather Forecast
Cascade Range · United StatesIssued: 10 pm Sun 20 Sep Local Time
Updates in:
Update imminent hr min s
Issued: 10 pm Sun 20 Sep Local Time
Updates in:
Update imminent hr min s
2 Mount Si Elevations: 2 Forecast Elevations: Days 1–4 Weather SummaryMostly dry. Very mild (max 18°C on Mon morning, min 9°C on Tue night). Wind will be generally light. | Days 5–7 Weather SummaryHeavy rain (total 37mm), heaviest during Thu night. Very mild (max 15°C on Thu morning, min 7°C on Thu night). Wind will be generally light. | |||||||||||||||
Monday 21 | Tuesday 22 | Wednesday 23 | Thursday 24 | Friday 25 | ||||||||||||
night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | |
 |  |  |  |  | | | | | |  |  |  | | |  | |
clear | clear | some clouds | some clouds | rain shwrs | rain shwrs | some clouds | some clouds | some clouds | some clouds | cloudy | light rain | heavy rain | rain shwrs | rain shwrs | rain shwrs | |
Cloud base (m) | 9400 | 6150 | 450 | 650 | 6850 | 2400 | 8450 | 4050 | 2600 | 1850 | 400 | 600 | 550 | 1800 | ||
km/h | ||||||||||||||||
 |  |  |  |  |  | |||||||||||
 cm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
mm | — | — | — | — | 0.2 | 0.2 | — | — | — | — | — | 4 | 28 | 3 | 2 | 0.5 |
max °C | 17 | 18 | 18 | 14 | 12 | 15 | 12 | 14 | 16 | 12 | 15 | 13 | 10 | 9 | 12 | 10 |
min °C | 15 | 15 | 18 | 11 | 11 | 14 | 9 | 10 | 15 | 11 | 13 | 11 | 7 | 7 | 11 | 8 |
chill °C | 15 | 15 | 18 | 11 | 11 | 14 | 9 | 10 | 15 | 11 | 13 | 10 | 6 | 6 | 10 | 8 |
Freezing level m | 4050 | 3850 | 3750 | 3550 | 3300 | 2900 | 2650 | 2850 | 3050 | 3250 | 2850 | 2800 | 1900 | 1750 | 2050 | 2500 |
 | — | 6:50 | — | — | 6:52 | — | — | 6:54 | — | — | 6:54 | — | — | 6:56 | — | — |
 | — | — | 7:07 | — | — | 7:05 | — | — | 7:02 | — | — | 7:00 | — | — | 6:59 | — |
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Mount Si Weather (Days 0-3):
The weather forecast for Mount Si is: Mostly dry. Very mild (max 18°C on Mon morning, min 9°C on Tue night). Wind will be generally light.
Mount Si Weather (Days 3-6):
Heavy rain (total 37mm), heaviest during Thu night. Very mild (max 15°C on Thu morning, min 7°C on Thu night). 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 |
|---|---|---|---|---|---|
 | |||||
| |||||
SHIP10859 | |||||
SHIP10373 | |||||
SHIP13808 | |||||
SHIP14191 | |||||
SHIP3761 | |||||
SHIP13319 |
* 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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