– Lat/Long: 47.51° N 121.74° W

Mount Si
Weather Forecast, United States
Issued: 3 pm Sat 20 Dec Local Time
Updates in:
hr min s
Update imminent

Issued: 3 pm Sat 20 Dec Local Time

Updates in:

hr min s

Update imminent

2 Mount Si Elevations: 2 Forecast Elevations:

	Days 1–4 Weather Summary A heavy fall of snow, heaviest during Mon night. Temperatures will be below freezing (max 0°C on Sun morning, min -4°C on Sun night). Winds decreasing (strong winds from the SW on Sat afternoon, light winds from the SSE by Tue morning).											Days 5–7 Weather Summary A dusting of new snow. Freeze-thaw conditions (max 3°C on Thu afternoon, min -2°C on Tue afternoon). Winds increasing (calm on Wed afternoon, fresh winds from the ESE by Wed night).
	Sat 20		Sunday 21			Monday 22			Tuesday 23			Wednesday 24			Thursday 25
	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night

	light snow	light snow	cloudy	snow shwrs	snow shwrs	cloudy	cloudy	heavy snow	light snow	light snow	cloudy	cloudy	some clouds	some clouds	cloudy	some clouds	snow shwrs
km/h	SW	SSW	S	SSW	SW	SSW	S	SW	SSE	SW	E	E	N	E	ESE	SE	SSW
See all weather maps
cm	3	3	—	2	9	—	—	12	2	1	—	—	—	—	—	—	2
mm	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—
max °C	-1	-1	0	0	-2	-1	0	-2	-2	-2	-1	0	1	2	2	3	2
min °C	-2	-2	-1	-1	-4	-2	-1	-3	-2	-2	-2	-1	0	1	2	2	1
chill °C	-11	-10	-7	-6	-12	-9	-8	-11	-5	-7	-4	-1	0	-2	-4	-3	-3

Freezing level m	1050	1000	1150	1200	800	1000	1100	800	950	850	1000	1350	1200	1700	1600	1600	1450
Cloud base (m)	400	450	400	500	400	700	850	400	400	400	500	500	400	450	1750	1700	400

	—	—	7:50	—	—	7:52	—	—	7:52	—	—	7:52	—	—	7:52	—	—
	4:16	—	—	4:17	—	—	4:17	—	—	4:19	—	—	4:20	—	—	4:20	—

Mount Si Weather (Days 0-3):

The weather forecast for Mount Si is: A heavy fall of snow, heaviest during Mon night. Temperatures will be below freezing (max 0°C on Sun morning, min -4°C on Sun night). Winds decreasing (strong winds from the SW on Sat afternoon, light winds from the SSE by Tue morning).

Mount Si Weather (Days 3-6):

A dusting of new snow. Freeze-thaw conditions (max 3°C on Thu afternoon, min -2°C on Tue afternoon). Winds increasing (calm on Wed afternoon, fresh winds from the ESE by Wed night).

This table gives the weather forecast for Mount Si at the specific elevation of 1270 m. Our advanced weather models allow us to provide distinct weather forecasts for several elevations of Mount Si. 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.

Live conditions reported by 5 closest weather stations

Weather Station	Temp.	Weather	Wind	Cloud Visibility Cloud / Visibility
Harman Heights wx 6 km SSW 251m alt. 31 minutes ago	6° C	Dry	Calm (3 kph at 103).
Black Diamond 32 km SSW 192m alt. 1 hour ago	17° C	Dry	Calm (0 kph at 0).
Renton Airport 36 km WSW 218m alt. 1 hour ago	7° C	Light rain .	Light winds from the SSE (7 kph at 150).	13 km Low: few Mid: broken High: overcast
Auburn 39 km SW 119m alt. 20 minutes ago	5° C	Dry	Calm (0 kph at 139).
Stampede Pass Airport 40 km SE 628m alt. 1 hour ago	-1° C	Light snow.	Calm (0 kph at 0).	2 km
Seattl / oeing Airport 44 km WSW 218m alt. 2 hours ago	7° C	Light rain .	Light winds from the S (17 kph at 190).	8 km Mid: broken High: overcast
Seattle Tacoma International Airport 44 km WSW 218m alt. 2 hours ago	6° C	Light rain .	Light winds from the S (13 kph at 170).	14 km Low: scattered Mid: broken High: overcast
Snohomish 49 km NW 196m alt. 54 minutes ago	6° C	Dry	Light winds from the S (6 kph at 182).
Seattle 49 km WSW 100m alt. 2 hours ago		-
BUOY-WPOW1 55 km W 3m alt. 37 minutes ago	8° C		Fresh winds from the S (37 kph at 190).

* 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.