– Lat/Long: 48.71° N 121.99° W
South Twin Sister Weather Forecast
Cascade Range · United StatesIssued: 4 pm Mon 21 Sep Local Time
Updates in:
Update imminent hr min s
Issued: 4 pm Mon 21 Sep Local Time
Updates in:
Update imminent hr min s
3 South Twin Sister Elevations: 3 Forecast Elevations: Days 1–4 Weather SummaryMostly dry. Mild temperatures (max 9°C on Mon afternoon, min 1°C on Tue night). Wind will be generally light. | Days 5–7 Weather SummaryA heavy fall of snow, heaviest during Thu night. Freeze-thaw conditions (max 4°C on Sat afternoon, min -3°C on Fri morning). Wind will be generally light. | ||||||||||||||||
Mon 21 | Tuesday 22 | Wednesday 23 | Thursday 24 | Friday 25 | Saturday 26 | ||||||||||||
PM | night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | |
 |  | | |  |  |  | | |  |  |  |  | | | |  | |
clear | clear | clear | clear | some clouds | cloudy | some clouds | some clouds | cloudy | light snow | heavy snow | mod. snow | snow shwrs | clear | some clouds | some clouds | light snow | |
Cloud base (m) | 600 | 2450 | 2000 | 1550 | 1650 | 2850 | 2000 | 550 | 600 | 600 | 1850 | 8500 | 5400 | 2300 | |||
km/h | |||||||||||||||||
 |  |  |  |  |  | ||||||||||||
 cm | — | — | — | — | — | — | — | — | — | 2 | 15 | 8 | 1 | — | — | — | 1 |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
max °C | 9 | 7 | 4 | 3 | 3 | 1 | 2 | 4 | 3 | 3 | 1 | -3 | -2 | 0 | 2 | 4 | 4 |
min °C | 8 | 5 | 3 | 3 | 1 | 1 | 1 | 2 | 3 | 1 | -2 | -3 | -3 | -1 | 1 | 4 | -1 |
chill °C | 5 | 1 | 0 | 0 | -3 | -2 | -4 | -2 | -1 | -5 | -7 | -9 | -10 | -6 | 1 | 1 | -7 |
Freezing level m | 3550 | 3300 | 2850 | 2600 | 2400 | 2250 | 2500 | 2850 | 2500 | 2450 | 1950 | 1700 | 1800 | 1950 | 2550 | 2800 | 2200 |
 | — | — | 6:54 | — | — | 6:54 | — | — | 6:56 | — | — | 6:58 | — | — | 6:58 | — | — |
 | 7:07 | — | — | 7:06 | — | — | 7:04 | — | — | 7:01 | — | — | 7:00 | — | — | 6:58 | — |
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South Twin Sister Weather (Days 0-3):
The weather forecast for South Twin Sister is: Mostly dry. Mild temperatures (max 9°C on Mon afternoon, min 1°C on Tue night). Wind will be generally light.
South Twin Sister Weather (Days 3-6):
A heavy fall of snow, heaviest during Thu night. Freeze-thaw conditions (max 4°C on Sat 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.
| Weather Station | Temp. | Weather | Wind | Gusts | Cloud / Visibility |
|---|---|---|---|---|---|
SHIP5719 | |||||
 | |||||
Bellingham Airport | | ||||
SHIP8484 | |||||
SHIP3141 | |||||
SHIP4074 | |||||
SHIP7745 | |||||
* 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.