– Lat/Long: 47.51° N 121.74° W

Mount Si
Weather Forecast, United States
Issued: 10 am Sat 28 Mar Local Time
Updates in:
hr min s
Update imminent

Issued: 10 am Sat 28 Mar Local Time

Updates in:

hr min s

Update imminent

2 Mount Si Elevations: 2 Forecast Elevations:

	Days 1–3 Weather Summary A moderate fall of snow, heaviest on Sun night. Freeze-thaw conditions (max 2°C on Sat afternoon, min -7°C on Mon morning). Winds decreasing (strong winds from the WSW on Sun afternoon, calm by Mon afternoon).									Days 4–6 Weather Summary A moderate fall of snow, heaviest on Wed morning. Freeze-thaw conditions (max 1°C on Tue morning, min -4°C on Wed night). Winds increasing (calm on Tue afternoon, fresh winds from the SSW by Wed afternoon).
	Saturday 28			Sunday 29			Monday 30			Tuesday 31			Wednesday 1			Thursday 2
	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night

	some clouds	cloudy	some clouds	cloudy	light snow	heavy snow	snow shwrs	some clouds	some clouds	cloudy	cloudy	some clouds	light snow	light snow	snow shwrs	light snow	light snow	some clouds
km/h	NW	WSW	SW	SW	WSW	NW	NW	NNW	ESE	SE	WSW	SE	SSE	SW	WSW	NW	NW	NNW
See all weather maps
cm	—	—	—	—	4	11	1	—	—	—	—	—	4	5	3	2	2	—
mm	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—
max °C	1	2	0	-2	-2	-4	-6	-3	0	1	1	1	0	-1	-3	-3	-2	-2
min °C	1	1	-2	-2	-2	-6	-7	-4	-3	0	1	-2	-1	-3	-4	-4	-2	-2
chill °C	-2	-3	-8	-8	-9	-13	-10	-7	-5	-3	0	-8	-7	-11	-10	-9	-7	-7

Freezing level m	1350	1400	900	1050	950	200	600	900	800	1350	1350	1300	1250	900	750	800	1050	850
Cloud base (m)	800	900	800	1500	450	550	450	550	400	3600	800	2400	400	400	400	450	450	600

	6:54	—	—	6:52	—	—	6:50	—	—	6:48	—	—	6:46	—	—	6:43	—	—
	—	7:30	—	—	7:31	—	—	7:32	—	—	7:34	—	—	7:36	—	—	7:37	—

Mount Si Weather (Days 0-3):

The weather forecast for Mount Si is: A moderate fall of snow, heaviest on Sun night. Freeze-thaw conditions (max 2°C on Sat afternoon, min -7°C on Mon morning). Winds decreasing (strong winds from the WSW on Sun afternoon, calm by Mon afternoon).

Mount Si Weather (Days 3-6):

A moderate fall of snow, heaviest on Wed morning. Freeze-thaw conditions (max 1°C on Tue morning, min -4°C on Wed night). Winds increasing (calm on Tue afternoon, fresh winds from the SSW by Wed afternoon).

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 10 closest weather stations

Weather Station	Temp.	Weather	Wind	Cloud Visibility Cloud / Visibility
Harman Heights wx 6 km SSW 251m alt. 1 hour ago	10° C	Dry	Calm (0 kph at 198).
Renton 30 km WSW 160m alt. 1 hour ago	11° C	-	Calm (2 kph at 287).
Renton Airport 36 km WSW 218m alt. 3 hours ago	9° C	Dry and partly cloudy.	Light winds from the N (7 kph at 350).	16 km Low: broken
Auburn 39 km SW 119m alt. 2 hours ago	16° C	Dry	Calm (0 kph at 211).
Stampede Pass Airport 40 km SE 628m alt. 3 hours ago	1° C	Dry and cloudy.	Light winds from the N (7 kph at 1).	16 km Low: few Mid: overcast
Seattl / oeing Airport 44 km WSW 218m alt. 3 hours ago	9° C	Dry and partly cloudy.	Light winds from the N (6 kph at 1).	16 km Low: broken Mid: broken
Seattle Tacoma International Airport 44 km WSW 218m alt. 2 hours ago	8° C	Dry and partly cloudy.	Light winds from the NNE (11 kph at 20).	16 km Low: broken
Snohomish 49 km NW 196m alt. 2 hours ago	8° C	Dry	Wind obs. (8 kph from 187 degs) was rejected.
Seattle 49 km WSW 100m alt. 1 hour ago		-	Wind obs. (10 kph from 343 degs) was rejected.
BUOY-WPOW1 55 km W 3m alt. 2 hours ago	9° C		Light winds from the NE (13 kph at 40).

* 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.