– Lat/Long: 47.51° N 121.74° W

Mount Si
Weather Forecast, United States
Issued: 3 pm Mon 15 Dec Local Time
Updates in:
hr min s
Update imminent

Issued: 3 pm Mon 15 Dec Local Time

Updates in:

hr min s

Update imminent

2 Mount Si Elevations: 2 Forecast Elevations:

	Days 1–4 Weather Summary Mild with heavy rain (total 46mm), heaviest during Tue night. Becoming colder with a moderate fall of snow heaviest on Tue night. Freeze-thaw conditions (max 5°C on Tue night, min -4°C on Tue night). Winds decreasing (severe gales from the WSW on Mon afternoon, light winds from the S by Wed night).											Days 5–7 Weather Summary A light fall of snow, heaviest on Fri afternoon. Turning milder with light rain (total 3mm) on Sun morning. Freeze-thaw conditions (max 3°C on Sun morning, min -5°C on Thu night). Winds decreasing (gales from the WSW on Thu afternoon, calm by Sat afternoon).
	Mon 15		Tuesday 16			Wednesday 17			Thursday 18			Friday 19			Saturday 20
	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night

	snow shwrs	light snow	mod. rain	heavy rain	light snow	light snow	light snow	light snow	light snow	light snow	snow shwrs	snow shwrs	light snow	light snow	light snow	clear	some clouds
km/h	WSW	SW	SW	SSW	WSW	WSW	WSW	SW	S	WSW	WSW	WSW	WSW	WSW	SW	SSW	SE
See all weather maps
cm	1	2	—	—	3	2	1	1	2	1	4	2	3	4	1	—	—
mm	4	—	8	11	20	—	—	—	4	—	—	—	—	—	—	—	—
max°C	4	1	4	4	5	-3	-2	-1	3	0	-3	-4	-4	-3	-3	-2	1
min°C	1	0	3	3	-4	-4	-3	-2	0	0	-5	-4	-4	-4	-3	-3	-2
chill°C	-7	-8	-4	-4	-14	-14	-12	-9	-7	-9	-14	-12	-12	-13	-9	-6	-5

Freezing level (m)	1850	1200	1850	1850	1900	800	900	1000	1350	1300	700	700	750	700	800	850	0
Cloud base (m)	450	400	500	350	350	450	500	400	450	350	450	550	450	450	450	500	400

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

Mount Si Weather (Days 0-3):

The weather forecast for Mount Si is: Mild with heavy rain (total 46mm), heaviest during Tue night. Becoming colder with a moderate fall of snow heaviest on Tue night. Freeze-thaw conditions (max 5°C on Tue night, min -4°C on Tue night). Winds decreasing (severe gales from the WSW on Mon afternoon, light winds from the S by Wed night).

Mount Si Weather (Days 3-6):

A light fall of snow, heaviest on Fri afternoon. Turning milder with light rain (total 3mm) on Sun morning. Freeze-thaw conditions (max 3°C on Sun morning, min -5°C on Thu night). Winds decreasing (gales from the WSW on Thu afternoon, calm by Sat 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 5 closest weather stations

Weather Station	Temp.	Weather	Wind	Cloud Visibility Cloud / Visibility
Harman Heights wx 6 km SSW 251m alt. 54 minutes ago	8° C	Dry	Calm (0 kph at 3).
Black Diamond 32 km SSW 192m alt. 49 minutes ago	12° C	Dry	Calm (0 kph at 0).
Renton Airport 36 km WSW 218m alt. 2 hours ago	11° C	Dry and cloudy.	Moderate winds from the S (22 kph at 190).	16 km Low: few Mid: scattered High: overcast
Auburn 39 km SW 119m alt. 1 hour ago	-2° C	-	Calm (0 kph at 103).
Stampede Pass Airport 40 km SE 628m alt. 2 hours ago	3° C	Dry and cloudy.	Light winds from the W (15 kph at 260).	13 km Low: broken Mid: overcast
Seattl / oeing Airport 44 km WSW 218m alt. 3 hours ago	11° C	-	Moderate winds from the S (22 kph at 190).	16 km Low: few Mid: few
Seattle Tacoma International Airport 44 km WSW 218m alt. 2 hours ago	10° C	Dry and cloudy.	Moderate winds from the S (22 kph at 190).	16 km Low: scattered Mid: overcast
Snohomish 49 km NW 196m alt. 2 hours ago	9° C	Dry	Light winds from the SW (8 kph at 225).
Seattle 49 km WSW 100m alt. 1 hour ago	2° C	-
SHIP5876 54 km W 15m alt. 3 hours ago			Moderate winds from the S (23 kph at 170).	- km

* 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.