– Lat/Long: 47.51° N 121.74° W

Mount Si
Weather Forecast, United States
Issued: 9 pm Thu 20 Nov Local Time
Updates in:
hr min s
Update imminent

Issued: 9 pm Thu 20 Nov Local Time

Updates in:

hr min s

Update imminent

2 Mount Si Elevations: 2 Forecast Elevations:

	Days 1–4 Weather Summary A moderate fall of snow, heaviest on Sun afternoon. Freeze-thaw conditions (max 5°C on Sat morning, min -3°C on Sun afternoon). Winds increasing (light winds from the S on Thu night, strong winds from the SW by Sun morning).										Days 5–7 Weather Summary A heavy fall of snow, heaviest during Tue night. Becoming milder with light rain (total 9mm) on Wed afternoon. Freeze-thaw conditions (max 4°C on Wed afternoon, min -4°C on Mon night). Winds increasing (calm on Tue morning, strong winds from the SW by Wed afternoon).
		Friday 21			Saturday 22			Sunday 23			Monday 24			Tuesday 25			Wednesday 26
	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night

	some clouds	some clouds	some clouds	cloudy	cloudy	cloudy	light snow	mod. snow	mod. snow	heavy snow	snow shwrs	snow shwrs	some clouds	cloudy	cloudy	mod. snow	light snow	mod. rain	heavy rain
km/h	W	WSW	SSW	SW	SW	SW	SW	SSW	WSW	WSW	W	NW	WNW	E	SE	SSE	SSW	SW	SW
See all weather maps
cm	—	—	—	—	—	—	1	6	9	11	2	1	—	—	—	9	5	—	—
mm	—	—	—	—	—	—	0.2	—	—	—	—	—	—	—	—	—	—	9	31
max°C	3	3	4	4	5	4	3	2	-1	-3	-3	-3	-3	-2	-1	0	2	4	5
min°C	1	2	3	4	4	4	2	1	-3	-3	-3	-3	-4	-2	-1	-2	1	3	4
chill°C	-1	-1	0	0	1	-1	-4	-6	-10	-10	-7	-7	-4	-2	-4	-6	-5	-3	-2

Freezing level (m)	1700	2000	2000	2300	2250	2300	1950	1550	1100	850	800	800	650	900	1050	950	1750	2200	2350
Cloud base (m)	9200	3000	2350	700	750	800	1750	400	400	450	450	500	600	550	1700	500	400	400	400

	—	7:20	—	—	7:22	—	—	7:22	—	—	7:24	—	—	7:26	—	—	7:26	—	—
	—	—	4:23	—	—	4:22	—	—	4:22	—	—	4:22	—	—	4:21	—	—	4:20	—

Mount Si Weather (Days 0-3):

The weather forecast for Mount Si is: A moderate fall of snow, heaviest on Sun afternoon. Freeze-thaw conditions (max 5°C on Sat morning, min -3°C on Sun afternoon). Winds increasing (light winds from the S on Thu night, strong winds from the SW by Sun morning).

Mount Si Weather (Days 3-6):

A heavy fall of snow, heaviest during Tue night. Becoming milder with light rain (total 9mm) on Wed afternoon. Freeze-thaw conditions (max 4°C on Wed afternoon, min -4°C on Mon night). Winds increasing (calm on Tue morning, strong winds from the SW 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 5 closest weather stations

Weather Station	Temp.	Weather	Wind	Cloud Visibility Cloud / Visibility
Harman Heights wx 6 km SSW 251m alt. 1 hour ago	3° C	Dry	Calm (0 kph at 229).
Renton Airport 36 km WSW 218m alt. 2 hours ago	4° C	Clear	Light winds from the SSE (6 kph at 150).	16 km
Auburn 39 km SW 119m alt. 1 hour ago	0° C	-	Calm (0 kph at 196).
Stampede Pass Airport 40 km SE 628m alt. 2 hours ago	0° C	Clear	Calm (0 kph at 0).	16 km
SHIP4815 42 km WSW 3m alt. 3 hours ago	6° C		Calm (4 kph at 200).
SHIP3237 42 km WSW 15m alt. 2 hours ago			Calm (6 kph at 150).	- km
SHIP1190 42 km WSW -m alt. 46 minutes ago	6° C	-	Calm (4 kph at 150).
SHIP5817 42 km WSW 15m alt. 3 hours ago			Calm (6 kph at 180).	- km
SHIP7415 42 km WSW 3m alt. 3 hours ago	6° C		Calm (5 kph at 180).
SHIP9263 42 km WSW 15m alt. 3 hours ago			Light winds from the SSE (10 kph at 160).	- 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.