– Lat/Long: 47.51° N 121.74° W
Mount Si Weather Forecast
Cascade Range · United StatesIssued: 10 am Fri 11 Sep Local Time
Updates in:
Update imminent hr min s
Issued: 10 am Fri 11 Sep Local Time
Updates in:
Update imminent hr min s
2 Mount Si Elevations: 2 Forecast Elevations: Days 1–3 Weather SummaryHeavy rain (total 22mm), heaviest during Sun morning. Very mild (max 17°C on Sat morning, min 10°C on Fri morning). Wind will be generally light. | Days 4–6 Weather SummaryMostly dry. Warm (max 22°C on Wed afternoon, min 9°C on Mon night). Wind will be generally light. | |||||||||||||||||
Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | |||||||||||||
AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | |
 |  |  | | |  |  |  |  |  | |  |  | |  | | | | |
cloudy | some clouds | cloudy | cloudy | cloudy | mod. rain | heavy rain | rain shwrs | rain shwrs | light rain | rain shwrs | some clouds | clear | clear | clear | clear | clear | clear | |
Cloud base (m) | 500 | 5800 | 4750 | 4300 | 450 | 400 | 400 | 850 | 600 | 950 | 1550 | 9000 | ||||||
km/h | ||||||||||||||||||
 |  |  |  |  |  | |||||||||||||
 cm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
mm | — | — | — | — | — | 7 | 11 | 3 | 1.5 | 0.3 | 0.1 | — | — | — | — | — | — | — |
max °C | 13 | 16 | 13 | 17 | 17 | 14 | 11 | 12 | 12 | 11 | 14 | 12 | 14 | 18 | 14 | 20 | 22 | 17 |
min °C | 10 | 16 | 13 | 14 | 17 | 10 | 10 | 11 | 10 | 10 | 13 | 9 | 10 | 17 | 12 | 14 | 22 | 15 |
chill °C | 10 | 16 | 13 | 14 | 17 | 9 | 9 | 9 | 10 | 10 | 13 | 9 | 10 | 17 | 12 | 14 | 22 | 15 |
Freezing level m | 3050 | 3000 | 2900 | 3050 | 3000 | 2500 | 2400 | 2550 | 2900 | 3300 | 3300 | 3100 | 2700 | 3150 | 3550 | 3800 | 4050 | 4100 |
 | 6:37 | — | — | 6:39 | — | — | 6:41 | — | — | 6:41 | — | — | 6:43 | — | — | 6:45 | — | — |
 | — | 7:27 | — | — | 7:24 | — | — | 7:22 | — | — | 7:21 | — | — | 7:19 | — | — | 7:16 | — |
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Mount Si Weather (Days 0-3):
The weather forecast for Mount Si is: Heavy rain (total 22mm), heaviest during Sun morning. Very mild (max 17°C on Sat morning, min 10°C on Fri morning). Wind will be generally light.
Mount Si Weather (Days 3-6):
Mostly dry. Warm (max 22°C on Wed afternoon, min 9°C on Mon 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 |
|---|---|---|---|---|---|
 | |||||
 | |||||
SHIP3519 | |||||
SHIP7299 | |||||
SHIP2427 | |||||
SHIP5931 | |||||
SHIP8713 |
* 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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