– Lat/Long: 48.71° N 121.99° W
South Twin Sister 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
3 South Twin Sister Elevations: 3 Forecast Elevations: Days 1–3 Weather SummaryA moderate fall of snow, heaviest on Fri night. Freeze-thaw conditions (max 3°C on Sun night, min -3°C on Fri night). Winds decreasing (strong winds from the S on Fri morning, calm by Sat night). | Days 4–6 Weather SummaryA moderate fall of snow, heaviest on Mon night. Freeze-thaw conditions (max 2°C on Mon morning, min -3°C on Wed night). Winds increasing (light winds from the W on Mon morning, strong winds from the SW by Mon night). | |||||||||||||||||
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 | |
 | |  |  | |  | |  | | | |  | | | | | |  | |
light snow | light snow | snow shwrs | some clouds | some clouds | some clouds | some clouds | clear | some clouds | clear | some clouds | light snow | light snow | light snow | snow shwrs | clear | clear | clear | |
Cloud base (m) | 650 | 600 | 700 | 750 | 1600 | 6350 | 5250 | 6650 | 3250 | 600 | 600 | 550 | 5100 | 850 | 1650 | 1900 | ||
km/h | ||||||||||||||||||
 |  |  |  |  |  | |||||||||||||
 cm | 3 | 3 | 8 | — | — | — | — | — | — | — | — | 5 | 3 | 2 | 3 | — | — | — |
mm | — | — | — | — | — | — | — | — | — | — | — | 0.6 | — | — | — | — | — | — |
max °C | 2 | 0 | -2 | -2 | 0 | 2 | 1 | 2 | 3 | 2 | 2 | 2 | 1 | 2 | 1 | -1 | -1 | -2 |
min °C | 0 | -1 | -3 | -3 | 0 | 1 | 1 | 2 | 2 | 1 | 2 | 1 | 1 | 1 | -1 | -2 | -2 | -3 |
chill °C | -7 | -7 | -10 | -8 | -4 | 1 | -1 | 0 | -1 | -3 | -2 | -5 | -4 | -4 | -6 | -7 | -7 | -9 |
Freezing level m | 2200 | 2050 | 1600 | 1650 | 2200 | 2450 | 2450 | 2550 | 2550 | 2450 | 2400 | 2700 | 2400 | 2400 | 2150 | 1850 | 1900 | 1800 |
 | 6:58 | — | — | 6:58 | — | — | 7:01 | — | — | 7:01 | — | — | 7:03 | — | — | 7:05 | — | — |
 | — | 7:00 | — | — | 6:58 | — | — | 6:54 | — | — | 6:52 | — | — | 6:51 | — | — | 6:49 | — |
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South Twin Sister Weather (Days 0-3):
The weather forecast for South Twin Sister is: A moderate fall of snow, heaviest on Fri night. Freeze-thaw conditions (max 3°C on Sun night, min -3°C on Fri night). Winds decreasing (strong winds from the S on Fri morning, calm by Sat night).
South Twin Sister Weather (Days 3-6):
A moderate fall of snow, heaviest on Mon night. Freeze-thaw conditions (max 2°C on Mon morning, min -3°C on Wed night). Winds increasing (light winds from the W on Mon morning, strong winds from the SW 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.
| Weather Station | Temp. | Weather | Wind | Gusts | Cloud / Visibility |
|---|---|---|---|---|---|
SHIP12511 | |||||
Skagit Burlingto / t Vernon Airport |  | ||||
Bellingham Airport | | ||||
SHIP11316 | |||||
Skagit Burlingto / t Vernon Airport | | ||||
Bellingham Airport | | ||||
* 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.