– Lat/Long: 48.71° N 121.99° W
South Twin Sister Weather Forecast
Cascade Range · United StatesIssued: 4 pm Sat 19 Sep Local Time
Updates in:
Update imminent hr min s
Issued: 4 pm Sat 19 Sep Local Time
Updates in:
Update imminent hr min s
3 South Twin Sister Elevations: 3 Forecast Elevations: Days 1–4 Weather SummaryMostly dry. Very mild (max 11°C on Sat night, min 3°C on Tue morning). Wind will be generally light. | Days 5–7 Weather SummaryA light covering of new snow mostly falling on Fri morning. Freeze-thaw conditions (max 4°C on Tue afternoon, min -3°C on Fri morning). Wind will be generally light. | ||||||||||||||||
Sat 19 | Sunday 20 | Monday 21 | Tuesday 22 | Wednesday 23 | Thursday 24 | ||||||||||||
PM | night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | |
 |  |  | | | | |  | | |  | |  | |  | |  | |
some clouds | clear | clear | clear | clear | clear | clear | some clouds | some clouds | clear | snow shwrs | some clouds | snow shwrs | some clouds | cloudy | cloudy | cloudy | |
Cloud base (m) | 9250 | 9450 | 7700 | 7050 | 5750 | 4600 | 750 | 1900 | 900 | 950 | 5750 | 5250 | 2250 | ||||
km/h | |||||||||||||||||
 |  |  |  |  |  | ||||||||||||
 cm | — | — | — | — | — | — | — | — | — | — | 1 | — | 1 | — | — | — | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
max °C | 10 | 11 | 10 | 11 | 11 | 8 | 7 | 7 | 4 | 4 | 2 | 0 | 1 | 1 | 1 | 3 | 3 |
min °C | 9 | 10 | 10 | 10 | 9 | 7 | 7 | 5 | 3 | 3 | 0 | 0 | 0 | 1 | 1 | 2 | -1 |
chill °C | 8 | 9 | 9 | 8 | 6 | 4 | 4 | 2 | 0 | 0 | -5 | -4 | -4 | -3 | -1 | 0 | -1 |
Freezing level m | 3750 | 3950 | 3950 | 4000 | 3850 | 3600 | 3450 | 3400 | 2950 | 2650 | 2300 | 2100 | 2250 | 2250 | 2300 | 2600 | 2150 |
 | — | — | 6:50 | — | — | 6:52 | — | — | 6:54 | — | — | 6:54 | — | — | 6:56 | — | — |
 | 7:12 | — | — | 7:09 | — | — | 7:07 | — | — | 7:06 | — | — | 7:04 | — | — | 7:01 | — |
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South Twin Sister Weather (Days 0-3):
The weather forecast for South Twin Sister is: Mostly dry. Very mild (max 11°C on Sat night, min 3°C on Tue morning). Wind will be generally light.
South Twin Sister Weather (Days 3-6):
A light covering of new snow mostly falling on Fri morning. Freeze-thaw conditions (max 4°C on Tue afternoon, min -3°C on Fri morning). Wind will be generally light.
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.