– Lat/Long: 47.51° N 121.74° W

Mount Si
Weather Forecast, United States
Issued: 9 am Sun 14 Dec Local Time
Updates in:
hr min s
Update imminent

Issued: 9 am Sun 14 Dec Local Time

Updates in:

hr min s

Update imminent

2 Mount Si Elevations: 2 Forecast Elevations:

	Days 1–3 Weather Summary Heavy rain (total 80mm), mostly on Tue night. Becoming colder with a light covering of snow ,mostly falling on Tue night. Freeze-thaw conditions (max 8°C on Sun night, min -4°C on Tue night). Winds decreasing (severe gales from the SW on Mon morning, moderate winds from the SSW by Mon night).									Days 4–6 Weather Summary A heavy fall of snow, heaviest during Wed morning. Freeze-thaw conditions (max 2°C on Thu morning, min -5°C on Fri night). Mainly gales.
	Sunday 14			Monday 15			Tuesday 16			Wednesday 17			Thursday 18			Friday 19
	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night

	light rain	cloudy	heavy rain	heavy rain	light snow	snow shwrs	mod. rain	mod. rain	light snow	light snow	light snow	light snow	light snow	light snow	snow shwrs	light snow	light snow	light snow
km/h	SSW	SW	SSW	SW	WSW	SW	SW	SW	WSW	WSW	WSW	SW	S	SW	WSW	SW	SW	WSW
See all weather maps
cm	—	—	—	—	1	1	—	—	3	3	2	1	3	2	1	2	2	5
mm	1.4	—	23	12	4	—	7	5	27	—	—	—	—	—	—	—	—	—
max°C	5	6	8	8	3	-1	4	3	3	-3	-2	-1	2	0	-3	-4	-4	-4
min°C	4	6	7	6	1	-1	2	3	-4	-4	-3	-2	0	-1	-4	-4	-4	-5
chill°C	-2	1	2	-2	-7	-10	-6	-4	-15	-14	-12	-10	-6	-9	-12	-12	-12	-13

Freezing level (m)	2350	2350	2800	2900	1850	1100	1700	1800	1700	800	900	1000	1300	1300	750	700	700	650
Cloud base (m)	1850	700	750	400	400	550	450	400	350	450	450	400	350	350	400	450	400	400

	7:47	—	—	7:48	—	—	7:48	—	—	7:48	—	—	7:50	—	—	7:50	—	—
	—	4:15	—	—	4:15	—	—	4:15	—	—	4:15	—	—	4:16	—	—	4:16	—

Mount Si Weather (Days 0-3):

The weather forecast for Mount Si is: Heavy rain (total 80mm), mostly on Tue night. Becoming colder with a light covering of snow ,mostly falling on Tue night. Freeze-thaw conditions (max 8°C on Sun night, min -4°C on Tue night). Winds decreasing (severe gales from the SW on Mon morning, moderate winds from the SSW by Mon night).

Mount Si Weather (Days 3-6):

A heavy fall of snow, heaviest during Wed morning. Freeze-thaw conditions (max 2°C on Thu morning, min -5°C on Fri night). Mainly gales.

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. 40 minutes ago	12° C	Dry	Calm (0 kph at 96).
Black Diamond 32 km SSW 192m alt. 1 hour ago		-	Wind obs. (6 kph from 360 degs) was rejected.
Renton Airport 36 km WSW 218m alt. 1 hour ago	11° C	Dry and cloudy.	Calm (0 kph at 0).	16 km Low: scattered Mid: broken High: overcast
Auburn 39 km SW 119m alt. 1 hour ago	11° C	Dry	Calm (0 kph at 134).
Stampede Pass Airport 40 km SE 628m alt. 2 hours ago	7° C	Dry and cloudy.	Calm (0 kph at 0).	16 km Low: broken Mid: overcast
Seattl / oeing Airport 44 km WSW 218m alt. 2 hours ago	11° C	Dry and cloudy.	Light winds from the SSE (6 kph at 150).	16 km Low: few Mid: scattered High: overcast
Seattle Tacoma International Airport 44 km WSW 218m alt. 2 hours ago	11° C	Dry and cloudy.	Light winds from the SW (7 kph at 220).	16 km Low: overcast
Snohomish 49 km NW 196m alt. 1 hour ago	12° C	Dry	Light winds from the SE (6 kph at 146).
Seattle 49 km WSW 100m alt. 1 hour ago	12° C	-	Wind obs. (18 kph from 338 degs) was rejected.
BUOY-WPOW1 55 km W 3m alt. 45 minutes ago	10° C		Fresh winds from the S (37 kph at 180).

* 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.