– Lat/Long: 48.71° N 121.99° W
South Twin Sister
Weather Forecast, United StatesIssued: 4 am Wed 20 May Local TimeUpdates in: hr min sUpdate imminent
Issued: 4 am Wed 20 May Local Time
Updates in:
Update imminent hr min s
Issued: 4 am Wed 20 May 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 Thu afternoon, min 3°C on Wed morning). Wind will be generally light. | Days 4–6 Weather SummaryMild with light rain (total 5mm) on Sun night Becoming colder with a light covering of snow, mostly falling on Mon morning. Freeze-thaw conditions (max 9°C on Sat afternoon, min -1°C on Mon morning). Winds increasing (light winds from the SW on Sat morning, fresh winds from the S by Sun night). | |||||||||||||||||
Wednesday 20 | Thursday 21 | Friday 22 | Saturday 23 | Sunday 24 | Monday 25 | |||||||||||||
AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | |
 | |  |  | | | | |  | | | | |  |  |  | |  | |
some clouds | some clouds | some clouds | clear | some clouds | some clouds | clear | clear | clear | clear | clear | some clouds | some clouds | light rain | light snow | light snow | light snow | snow shwrs | |
km/h | ||||||||||||||||||
 |  |  |  |  |  | |||||||||||||
— | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 4 | 1 | 1 | |
— | — | — | — | — | — | — | — | — | — | — | — | — | 0.1 | 5 | — | — | — | |
max °C | 4 | 8 | 9 | 10 | 11 | 10 | 8 | 10 | 10 | 7 | 9 | 8 | 5 | 7 | 6 | 0 | 1 | 1 |
min °C | 3 | 7 | 8 | 9 | 11 | 9 | 8 | 10 | 8 | 7 | 9 | 6 | 5 | 7 | 1 | -1 | 1 | 1 |
3 | 6 | 7 | 9 | 10 | 8 | 7 | 9 | 7 | 6 | 7 | 3 | 2 | 5 | -6 | -8 | -3 | -2 | |
2600 | 2900 | 3050 | 2900 | 3000 | 2850 | 2900 | 3100 | 3200 | 2900 | 3000 | 2650 | 2450 | 2550 | 2300 | 1450 | 1650 | 1700 | |
Cloud base (m) | 900 | 1750 | 6350 | 5450 | 2700 | 7950 | 2350 | 6800 | 1600 | 7000 | 3350 | 2600 | 700 | 600 | 550 | 550 | ||
 | 5:20 | — | — | 5:18 | — | — | 5:18 | — | — | 5:16 | — | — | 5:16 | — | — | 5:15 | — | — |
 | — | — | 8:47 | — | — | 8:50 | — | — | 8:51 | — | — | 8:52 | — | — | 8:52 | — | — | 8:53 |
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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 Thu afternoon, min 3°C on Wed morning). Wind will be generally light.
South Twin Sister Weather (Days 3-6):
Mild with light rain (total 5mm) on Sun night Becoming colder with a light covering of snow, mostly falling on Mon morning. Freeze-thaw conditions (max 9°C on Sat afternoon, min -1°C on Mon morning). Winds increasing (light winds from the SW on Sat morning, fresh winds from the S by Sun night).
This table gives the weather forecast for South Twin Sister at the specific elevation of 1500 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 |  |
* 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.