– Lat/Long: 47.51° N 121.74° W

Mount Si
Weather Forecast, United States
Issued: 9 am Fri 19 Dec Local Time
Updates in:
hr min s
Update imminent

Issued: 9 am Fri 19 Dec Local Time

Updates in:

hr min s

Update imminent

2 Mount Si Elevations: 2 Forecast Elevations:

	Days 1–3 Weather Summary A heavy fall of snow, heaviest during Sun afternoon. Temperatures will be below freezing (max -1°C on Sun morning, min -4°C on Fri morning). Winds decreasing (near gales from the WSW on Fri afternoon, moderate winds from the SSW by Sat night).									Days 4–6 Weather Summary A moderate fall of snow, heaviest on Mon night. Freeze-thaw conditions (max 3°C on Wed night, min -3°C on Mon morning). Mainly strong winds.
	Friday 19			Saturday 20			Sunday 21			Monday 22			Tuesday 23			Wednesday 24
	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night

	light snow	snow shwrs	mod. snow	light snow	light snow	light snow	some clouds	mod. snow	mod. snow	light snow	light snow	mod. snow	cloudy	some clouds	cloudy	cloudy	light snow	some clouds
km/h	WSW	WSW	WSW	SW	SW	SSW	SSW	SW	WSW	SSW	SSW	SW	S	S	ESE	SE	SW	SE
See all weather maps
cm	2	2	8	3	3	1	—	9	6	2	2	10	—	—	—	—	4	—
mm	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—
max°C	-3	-3	-3	-2	-2	-2	-1	-2	-3	-2	-2	-2	-1	0	1	1	-2	3
min°C	-4	-4	-4	-3	-2	-2	-1	-2	-3	-3	-2	-3	-3	0	-1	0	-2	-2
chill°C	-13	-14	-13	-11	-11	-10	-7	-10	-10	-12	-10	-10	-8	-5	-7	-5	-10	-5

Freezing level (m)	750	750	750	850	950	1000	1150	1000	800	850	950	800	850	1200	1400	1600	900	1500
Cloud base (m)	400	400	400	400	400	400	500	700	400	400	450	400	400	550	2450	600	400	450

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

Mount Si Weather (Days 0-3):

The weather forecast for Mount Si is: A heavy fall of snow, heaviest during Sun afternoon. Temperatures will be below freezing (max -1°C on Sun morning, min -4°C on Fri morning). Winds decreasing (near gales from the WSW on Fri afternoon, moderate winds from the SSW by Sat night).

Mount Si Weather (Days 3-6):

A moderate fall of snow, heaviest on Mon night. Freeze-thaw conditions (max 3°C on Wed night, min -3°C on Mon morning). Mainly strong winds.

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. 2 hours ago	3° C	Dry	Calm (0 kph at 225).
Black Diamond 32 km SSW 192m alt. 1 hour ago		-	Calm (3 kph at 0).
Renton Airport 36 km WSW 218m alt. 1 hour ago	6° C	Dry and partly cloudy.	Moderate winds from the S (22 kph at 190).	16 km Low: few Mid: scattered
Auburn 39 km SW 119m alt. 1 hour ago	13° C	Dry	Calm (0 kph at 113).
Stampede Pass Airport 40 km SE 628m alt. 36 minutes ago	-3° C	Moderate snow.	Light winds from the N (11 kph at 1).	0 km
Seattl / oeing Airport 44 km WSW 218m alt. 2 hours ago	6° C	Dry and partly cloudy.	Light winds from the SSW (19 kph at 200).	16 km Low: broken
Seattle Tacoma International Airport 44 km WSW 218m alt. 2 hours ago	4° C	Dry and partly cloudy.	Light winds from the S (17 kph at 170).	16 km Low: scattered Mid: broken High: broken
Snohomish 49 km NW 196m alt. 1 hour ago	4° C	Dry	Light winds from the S (8 kph at 181).
Seattle 49 km WSW 100m alt. 58 minutes ago		-	Wind obs. (13 kph from 298 degs) was rejected.
BUOY-WPOW1 55 km W 3m alt. 45 minutes ago	6° C		Strong winds from the SSW (48 kph at 200).

* 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.