– Lat/Long: 47.51° N 121.74° W

Mount Si
Weather Forecast, United States
Issued: 4 am Mon 09 Mar Local Time
Updates in:
hr min s
Update imminent

Issued: 4 am Mon 09 Mar 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 Wed morning. Becoming milder with moderate rain (total 16mm) on Wed night. Freeze-thaw conditions (max 3°C on Wed night, min -8°C on Mon night). Winds increasing (moderate winds from the WSW on Tue morning, stormy winds from the SW by Wed night).									Days 4–6 Weather Summary A heavy fall of snow, heaviest during Thu night. Freeze-thaw conditions (max 1°C on Thu night, min -6°C on Sat morning). Winds decreasing (near gales from the WSW on Thu night, calm by Sat night).
	Monday 9			Tuesday 10			Wednesday 11			Thursday 12			Friday 13			Saturday 14
	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night

	light snow	light snow	light snow	snow shwrs	light snow	mod. snow	mod. snow	light snow	light snow	light snow	mod. snow	heavy snow	heavy snow	heavy snow	mod. snow	light snow	snow shwrs	some clouds
km/h	WSW	WSW	WSW	WSW	SW	WSW	SW	SW	WSW	WSW	SW	SW	WSW	SW	WSW	NW	NNW	N
See all weather maps
cm	4	4	5	2	3	6	7	4	2	2	10	30	11	12	7	3	1	—
mm	—	—	—	—	—	—	—	—	16	—	—	—	—	—	—	—	—	—
max °C	-6	-5	-6	-6	-4	-3	-1	2	3	-3	-3	1	0	-2	-3	-6	-4	-2
min °C	-7	-5	-8	-8	-5	-4	-2	1	-3	-3	-3	-2	-1	-2	-5	-6	-5	-4
chill °C	-15	-14	-17	-16	-12	-12	-10	-8	-12	-12	-11	-8	-9	-9	-11	-11	-9	-8

Freezing level m	500	600	300	500	550	700	1000	1550	1100	850	800	1700	1000	750	500	450	650	0
Cloud base (m)	400	450	400	450	750	450	400	400	450	500	400	400	400	400	400	450	450	450

	7:31	—	—	7:30	—	—	7:28	—	—	7:26	—	—	7:24	—	—	7:22	—	—
	—	7:02	—	—	7:04	—	—	7:06	—	—	7:07	—	—	7:08	—	—	7:09	—

Mount Si Weather (Days 0-3):

The weather forecast for Mount Si is: A heavy fall of snow, heaviest during Wed morning. Becoming milder with moderate rain (total 16mm) on Wed night. Freeze-thaw conditions (max 3°C on Wed night, min -8°C on Mon night). Winds increasing (moderate winds from the WSW on Tue morning, stormy winds from the SW by Wed night).

Mount Si Weather (Days 3-6):

A heavy fall of snow, heaviest during Thu night. Freeze-thaw conditions (max 1°C on Thu night, min -6°C on Sat morning). Winds decreasing (near gales from the WSW on Thu night, calm by Sat 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 10 closest weather stations

Weather Station	Temp.	Weather	Wind	Cloud Visibility Cloud / Visibility
Harman Heights wx 6 km SSW 251m alt. 1 hour ago	2° C	-	Calm (0 kph at 355).
Snoqualmie Pass 30 km ESE 824m alt. 24 minutes ago	-1° C	-	Calm (0 kph at 163).
Black Diamond 32 km SSW 192m alt. 1 hour ago	13° C	Dry	Calm (0 kph at 0).
Grotto wx 35 km NE 321m alt. 38 minutes ago	0° C	-	Calm (0 kph at 355).
Renton Airport 36 km WSW 218m alt. 2 hours ago	4° C	Clear	Light winds from the N (6 kph at 1).	16 km
Auburn 39 km SW 119m alt. 1 hour ago	-4° C	-	Calm (0 kph at 95).
Stampede Pass Airport 40 km SE 628m alt. 1 hour ago	-5° C	Light snow.	Light winds from the W.(Wind varies from 210 to 050 degs) (13 kph at 260).	5 km Mid: broken High: broken
Seattl / oeing Airport 44 km WSW 218m alt. 2 hours ago	4° C	Dry and partly cloudy.	Calm (0 kph at 0).	16 km Low: broken Mid: broken
Seattle Tacoma International Airport 44 km WSW 218m alt. 2 hours ago	3° C	Dry and partly cloudy.	Light winds from the SSW (19 kph at 200).	16 km Low: broken Mid: broken
Snohomish 49 km NW 196m alt. 1 hour ago	1° C	-	Calm (3 kph at 128).

* 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.