– Lat/Long: 48.71° N 121.99° W
South Twin Sister Weather Forecast
Cascade Range · United StatesIssued: 10 am Wed 14 Oct Local Time
Updates in:
Update imminent hr min s
Issued: 10 am Wed 14 Oct Local Time
Updates in:
Update imminent hr min s
3 South Twin Sister Elevations: 3 Forecast Elevations: Days 1–3 Weather SummaryLight rain (total 2mm), mostly falling on Fri night. Very mild (max 11°C on Thu afternoon, min 3°C on Fri night). Winds increasing (calm on Wed night, strong winds from the SSW by Fri night). | Days 4–6 Weather SummaryA light covering of new snow mostly falling on Sat morning. Freeze-thaw conditions (max 2°C on Sun afternoon, min -4°C on Mon night). Winds decreasing (fresh winds from the SW on Sat morning, calm by Mon night). | |||||||||||||||||
Wednesday 14 | Thursday 15 | Friday 16 | Saturday 17 | Sunday 18 | Monday 19 | |||||||||||||
AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | |
 | |  |  | | | | |  |  |  | |  | |  | | |  | |
rain shwrs | rain shwrs | clear | clear | clear | clear | clear | clear | rain shwrs | light snow | snow shwrs | clear | cloudy | cloudy | cloudy | cloudy | light snow | snow shwrs | |
Cloud base (m) | 800 | 1650 | 9400 | 8300 | 3050 | 600 | 950 | 6400 | 5300 | 1500 | 600 | 650 | ||||||
km/h | ||||||||||||||||||
 |  |  |  |  |  | |||||||||||||
 cm | — | — | — | — | — | — | — | — | — | 5 | 1 | — | — | — | — | — | 2 | 1 |
mm | 0.1 | 0.1 | — | — | — | — | — | — | 2 | — | — | — | — | — | — | — | — | — |
max °C | 5 | 6 | 9 | 10 | 11 | 11 | 11 | 10 | 8 | 1 | -3 | -1 | 1 | 2 | 2 | -2 | -3 | -3 |
min °C | 4 | 5 | 6 | 10 | 10 | 11 | 11 | 9 | 3 | -2 | -3 | -2 | 0 | 1 | 0 | -3 | -3 | -4 |
chill °C | 0 | 2 | 4 | 9 | 8 | 9 | 8 | 5 | -3 | -9 | -10 | -8 | -2 | -2 | -5 | -8 | -6 | -4 |
Freezing level m | 3400 | 3600 | 3900 | 3900 | 3950 | 3850 | 3800 | 3600 | 2900 | 1700 | 1700 | 1750 | 2300 | 2500 | 2150 | 1500 | 1500 | 1500 |
 | 7:26 | — | — | 7:26 | — | — | 7:28 | — | — | 7:30 | — | — | 7:31 | — | — | 7:33 | — | — |
 | — | 6:21 | — | — | 6:19 | — | — | 6:16 | — | — | 6:15 | — | — | 6:13 | — | — | 6:10 | — |
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South Twin Sister Weather (Days 0-3):
The weather forecast for South Twin Sister is: Light rain (total 2mm), mostly falling on Fri night. Very mild (max 11°C on Thu afternoon, min 3°C on Fri night). Winds increasing (calm on Wed night, strong winds from the SSW by Fri night).
South Twin Sister Weather (Days 3-6):
A light covering of new snow mostly falling on Sat morning. Freeze-thaw conditions (max 2°C on Sun afternoon, min -4°C on Mon night). Winds decreasing (fresh winds from the SW on Sat morning, calm by Mon night).
This table gives the weather forecast for South Twin Sister at the specific elevation of 2134 m. Our advanced weather models allow us to provide distinct weather forecasts for several elevations of South Twin Sister. 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.