– Lat/Long: 48.71° N 121.99° W
South Twin Sister
Weather Forecast, United StatesIssued: 10 am Sun 30 Aug Local TimeUpdates in: hr min sUpdate imminent
Issued: 10 am Sun 30 Aug Local Time
Updates in:
Update imminent hr min s
Issued: 10 am Sun 30 Aug Local Time
Updates in:
Update imminent hr min s
3 South Twin Sister Elevations: 3 Forecast Elevations: Days 1–3 Weather SummaryMostly dry. Very mild (max 11°C on Mon afternoon, min 2°C on Sun morning). Wind will be generally light. | Days 4–6 Weather SummaryMild with light rain (total 10mm) on Wed night Becoming colder with a light covering of snow, mostly falling on Wed night. Freeze-thaw conditions (max 4°C on Wed morning, min -1°C on Thu morning). Winds decreasing (strong winds from the SSE on Wed night, calm by Fri afternoon). | |||||||||||||||||
Sunday 30 | Monday 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | Friday 4 | |||||||||||||
AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | |
 |  |  |  |  |  | | | | | |  |  |  |  | | | | |
light rain | rain shwrs | rain shwrs | some clouds | clear | some clouds | clear | clear | some clouds | rain shwrs | light rain | mod. snow | light snow | cloudy | light snow | cloudy | cloudy | some clouds | |
Cloud base (m) | 800 | 1750 | 4600 | 4600 | 6950 | 5100 | 5200 | 2000 | 1750 | 850 | 550 | 600 | 800 | 1850 | 2000 | 750 | 2400 | |
km/h | ||||||||||||||||||
 |  |  |  |  |  | |||||||||||||
 cm | — | — | — | — | — | — | — | — | — | — | — | 7 | 1 | — | 1 | — | — | — |
mm | 0.1 | 0.2 | 0.1 | — | — | — | — | — | — | 0.1 | 1.1 | 8 | — | — | — | — | — | — |
max °C | 3 | 4 | 7 | 8 | 11 | 11 | 9 | 9 | 7 | 4 | 3 | 2 | -1 | -1 | 0 | 0 | 1 | 2 |
min °C | 2 | 4 | 5 | 7 | 10 | 9 | 8 | 8 | 4 | 3 | 3 | 0 | -1 | -1 | -1 | 0 | 0 | 1 |
chill °C | -2 | 0 | 3 | 5 | 8 | 6 | 5 | 5 | -1 | -3 | -3 | -5 | -6 | -5 | -5 | -3 | 0 | -1 |
Freezing level m | 2950 | 3100 | 3450 | 3700 | 3750 | 3700 | 3700 | 3550 | 3150 | 2800 | 2600 | 2450 | 1950 | 2050 | 2050 | 2100 | 2250 | 2350 |
 | 6:20 | — | — | 6:22 | — | — | 6:24 | — | — | 6:24 | — | — | 6:26 | — | — | 6:28 | — | — |
 | — | 7:53 | — | — | 7:52 | — | — | 7:50 | — | — | 7:47 | — | — | 7:45 | — | — | 7:44 | — |
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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 Mon afternoon, min 2°C on Sun morning). Wind will be generally light.
South Twin Sister Weather (Days 3-6):
Mild with light rain (total 10mm) on Wed night Becoming colder with a light covering of snow, mostly falling on Wed night. Freeze-thaw conditions (max 4°C on Wed morning, min -1°C on Thu morning). Winds decreasing (strong winds from the SSE on Wed night, calm by Fri afternoon).
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 |
|---|---|---|---|---|---|
 | |||||
Bellingham Airport | | ||||
SHIP5341 | |||||
* 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.