– Lat/Long: 47.51° N 121.74° W

Mount Si
Weather Forecast, United States
Issued: 3 am Sun 14 Dec Local Time
Updates in:
hr min s
Update imminent

Issued: 3 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 Mild with heavy rain (total 52mm), heaviest during Sun night. Becoming colder with a moderate fall of snow heaviest on Tue night. Freeze-thaw conditions (max 8°C on Sun night, min -4°C on Tue night). Winds increasing (fresh winds from the SW on Sun morning, stormy winds from the SW by Mon afternoon).									Days 4–6 Weather Summary A heavy fall of snow, heaviest during Thu morning. Freeze-thaw conditions (max 1°C on Thu morning, min -4°C on Wed morning). 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	light snow	light snow	mod. rain	mod. snow	light snow	light snow	cloudy	light snow	light snow	light snow	light snow	snow shwrs	light snow
km/h	SSW	SW	SSW	SW	SW	SW	SW	SW	W	WSW	WSW	SW	SSE	SW	WSW	SW	WSW	WSW
See all weather maps
cm	—	—	—	—	1	3	1	—	9	3	2	—	5	1	4	2	3	4
mm	0.6	—	18	11	4	—	5	5	8	—	—	—	—	—	—	—	—	—
max°C	5	6	8	8	6	0	3	3	4	-3	-3	-1	1	0	-2	-4	-4	-4
min°C	4	6	7	8	1	-1	2	2	-4	-4	-3	-2	-1	-2	-4	-4	-4	-4
chill°C	-2	1	2	2	-7	-10	-5	-5	-15	-14	-12	-9	-8	-11	-12	-11	-12	-12

Freezing level (m)	2250	2400	2700	2850	2150	1150	1700	1600	1600	800	850	950	1050	1250	850	700	750	700
Cloud base (m)	2000	900	750	400	400	500	400	400	350	450	500	400	450	350	350	500	400	550

	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: Mild with heavy rain (total 52mm), heaviest during Sun night. Becoming colder with a moderate fall of snow heaviest on Tue night. Freeze-thaw conditions (max 8°C on Sun night, min -4°C on Tue night). Winds increasing (fresh winds from the SW on Sun morning, stormy winds from the SW by Mon afternoon).

Mount Si Weather (Days 3-6):

A heavy fall of snow, heaviest during Thu morning. Freeze-thaw conditions (max 1°C on Thu morning, min -4°C on Wed morning). 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. 56 minutes ago	10° C	Dry	Calm (0 kph at 29).
Black Diamond 32 km SSW 192m alt. 46 minutes ago	11° C	Dry	Calm (2 kph at 0).
Renton Airport 36 km WSW 218m alt. 2 hours ago	7° C	Dry and partly cloudy.	Light winds from the SSE (6 kph at 150).	16 km Low: scattered
Auburn 39 km SW 119m alt. 1 hour ago	-4° C	-	Calm (0 kph at 138).
Stampede Pass Airport 40 km SE 628m alt. 2 hours ago	8° C	Dry and partly cloudy.	Calm (0 kph at 0).	16 km Low: scattered
Seattl / oeing Airport 44 km WSW 218m alt. 2 hours ago	8° C	Dry and partly cloudy.	Light winds from the SSE (11 kph at 150).	16 km Low: broken
Seattle Tacoma International Airport 44 km WSW 218m alt. 2 hours ago	8° C	Dry and partly cloudy.	Light winds from the SSE (9 kph at 160).	16 km Low: broken
Snohomish 49 km NW 196m alt. 36 minutes ago	9° C	Dry	Calm (2 kph at 40).
Seattle 49 km WSW 100m alt. 44 minutes ago	14° C	-
BUOY-WPOW1 55 km W 3m alt. 1 hour ago	11° C		Fresh winds from the S (30 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.