– Lat/Long: 47.51° N 121.74° W

Mount Si
Weather Forecast, United States
Issued: 3 am Sat 20 Dec Local Time
Updates in:
hr min s
Update imminent

Issued: 3 am Sat 20 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 Mon afternoon. Temperatures will be below freezing (max 0°C on Sun morning, min -4°C on Sun night). Winds increasing (light winds from the SSW on Sun morning, strong winds from the SSW by Mon afternoon).									Days 4–6 Weather Summary A light covering of new snow mostly falling on Thu night. Freeze-thaw conditions (max 3°C on Thu morning, min -2°C on Tue morning). Mainly fresh winds.
	Saturday 20			Sunday 21			Monday 22			Tuesday 23			Wednesday 24			Thursday 25
	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night

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

Freezing level (m)	850	950	1050	1350	1200	800	850	1000	800	900	900	1300	1250	1050	1250	1850	1600	1600
Cloud base (m)	400	400	400	550	650	400	450	450	400	400	400	750	1500	550	450	400	1750	1950

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

Mount Si Weather (Days 0-3):

The weather forecast for Mount Si is: A heavy fall of snow, heaviest during Mon afternoon. Temperatures will be below freezing (max 0°C on Sun morning, min -4°C on Sun night). Winds increasing (light winds from the SSW on Sun morning, strong winds from the SSW by Mon afternoon).

Mount Si Weather (Days 3-6):

A light covering of new snow mostly falling on Thu night. Freeze-thaw conditions (max 3°C on Thu morning, min -2°C on Tue morning). Mainly fresh 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. 57 minutes ago	4° C	Dry	Calm (2 kph at 43).
Black Diamond 32 km SSW 192m alt. 1 hour ago	9° C	Dry	Calm (2 kph at 196).
Renton Airport 36 km WSW 218m alt. 2 hours ago	6° C	Light rain .	Light winds from the SSE (11 kph at 160).	16 km Low: broken Mid: broken High: overcast
Auburn 39 km SW 119m alt. 46 minutes ago	3° C	Dry	Calm (0 kph at 201).
Stampede Pass Airport 40 km SE 628m alt. 2 hours ago	-3° C	Moderate snow.	Calm (0 kph at 0).	1 km
Seattl / oeing Airport 44 km WSW 218m alt. 2 hours ago	6° C	Light rain .	Moderate winds from the S (20 kph at 190).	13 km Low: overcast
Seattle Tacoma International Airport 44 km WSW 218m alt. 2 hours ago	5° C	Light rain .	Moderate winds from the SSW (22 kph at 200).	16 km Low: few Mid: broken High: overcast
Snohomish 49 km NW 196m alt. 2 hours ago	5° C	Dry	Light winds from the SE (14 kph at 142).
Seattle 49 km WSW 100m alt. 1 hour ago	4° C	-
SHIP6220 51 km W 3m alt. 3 hours ago	6° C

* 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.