– Lat/Long: 47.51° N 121.74° W
Mount Si Weather Forecast
Cascade Range · United StatesIssued: 4 am Fri 25 Sep Local Time
Updates in:
Update imminent hr min s
Issued: 4 am Fri 25 Sep Local Time
Updates in:
Update imminent hr min s
2 Mount Si Elevations: 2 Forecast Elevations: Days 1–3 Weather SummaryHeavy rain (total 29mm), heaviest during Fri afternoon. Mild temperatures (max 9°C on Fri morning, min 2°C on Fri night). Winds decreasing (near gales from the WSW on Fri afternoon, calm by Sat morning). | Days 4–6 Weather SummaryModerate rain (total 18mm), heaviest on Tue morning. Mild temperatures (max 8°C on Mon afternoon, min 3°C on Wed night). Winds increasing (calm on Mon morning, strong winds from the WSW by Tue morning). | |||||||||||||||||
Friday 25 | Saturday 26 | Sunday 27 | Monday 28 | Tuesday 29 | Wednesday 30 | |||||||||||||
AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | |
 |  |  | |  |  |  | |  | | |  | |  |  | | | | |
rain shwrs | heavy rain | mod. rain | rain shwrs | some clouds | some clouds | clear | clear | clear | clear | clear | light rain | heavy rain | light rain | rain shwrs | clear | rain shwrs | rain shwrs | |
Cloud base (m) | 2150 | 650 | 750 | 8800 | 6150 | 5300 | 6050 | 750 | 400 | 500 | 500 | 1900 | 950 | 1950 | ||||
km/h | ||||||||||||||||||
 |  |  |  |  |  | |||||||||||||
 cm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
mm | 4 | 18 | 8 | 0.1 | — | — | — | — | — | — | — | 1.8 | 12 | 1.3 | 3 | — | 0.5 | 0.3 |
max °C | 9 | 5 | 3 | 4 | 6 | 7 | 7 | 8 | 7 | 7 | 8 | 7 | 7 | 8 | 7 | 4 | 5 | 4 |
min °C | 5 | 4 | 2 | 2 | 6 | 6 | 6 | 7 | 6 | 6 | 8 | 6 | 7 | 8 | 4 | 4 | 5 | 3 |
chill °C | -1 | -3 | -3 | 2 | 4 | 5 | 6 | 6 | 4 | 5 | 8 | 1 | 2 | 4 | 2 | 2 | 3 | 1 |
Freezing level m | 2150 | 2000 | 1600 | 2000 | 2400 | 2600 | 2550 | 2650 | 2750 | 2850 | 2900 | 3100 | 2600 | 2600 | 2350 | 2100 | 2000 | 1850 |
 | 6:56 | — | — | 6:58 | — | — | 6:58 | — | — | 7:01 | — | — | 7:01 | — | — | 7:03 | — | — |
 | — | 6:59 | — | — | 6:57 | — | — | 6:54 | — | — | 6:52 | — | — | 6:51 | — | — | 6:49 | — |
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Mount Si Weather (Days 0-3):
The weather forecast for Mount Si is: Heavy rain (total 29mm), heaviest during Fri afternoon. Mild temperatures (max 9°C on Fri morning, min 2°C on Fri night). Winds decreasing (near gales from the WSW on Fri afternoon, calm by Sat morning).
Mount Si Weather (Days 3-6):
Moderate rain (total 18mm), heaviest on Tue morning. Mild temperatures (max 8°C on Mon afternoon, min 3°C on Wed night). Winds increasing (calm on Mon morning, strong winds from the WSW by Tue morning).
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.
* 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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