– Lat/Long: 47.51° N 121.74° W

Mount Si
Weather Forecast, United States
Issued: 9 pm Wed 18 Feb Local Time
Updates in:
hr min s
Update imminent

Issued: 9 pm Wed 18 Feb Local Time

Updates in:

hr min s

Update imminent

2 Mount Si Elevations: 2 Forecast Elevations:

	Days 1–4 Weather Summary A dusting of new snow. Freeze-thaw conditions (max 1°C on Sat afternoon, min -7°C on Thu afternoon). Winds increasing (calm on Thu morning, strong winds from the ESE by Sat afternoon).										Days 5–7 Weather Summary A moderate fall of snow, heaviest on Mon morning. Freeze-thaw conditions (max 2°C on Sat night, min -3°C on Tue morning). Winds decreasing (strong winds from the ESE on Sat night, light winds from the WSW by Tue afternoon).
		Thursday 19			Friday 20			Saturday 21			Sunday 22			Monday 23			Tuesday 24
	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night

	some clouds	cloudy	some clouds	some clouds	cloudy	some clouds	some clouds	light snow	light snow	some clouds	cloudy	light snow	light snow	mod. snow	light snow	snow shwrs	some clouds	snow shwrs	light snow
km/h	ENE	WSW	NNW	WSW	SW	SW	ESE	SE	ESE	ESE	SE	SE	SSW	S	SW	WSW	SW	WSW	WSW
See all weather maps
cm	—	—	—	—	—	—	—	1	1	—	—	1	3	6	1	2	—	1	5
mm	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—
max °C	-5	-6	-6	-7	-5	-4	-2	-1	1	2	1	1	0	1	0	-1	-2	-2	-2
min °C	-6	-6	-7	-7	-6	-5	-4	-2	-1	1	1	0	0	0	0	-2	-3	-2	-3
chill °C	-8	-6	-10	-10	-13	-9	-7	-10	-9	-7	-6	-6	-7	-7	-7	-7	-8	-6	-12

Freezing level m	450	200	250	0	450	700	400	1100	1100	1450	1550	1500	1250	1550	1300	1050	900	1050	900
Cloud base (m)	600	550	400	600	450	550	3200	3000	750	850	2250	1900	450	500	450	450	450	600	400

	—	7:05	—	—	7:03	—	—	7:01	—	—	6:58	—	—	6:58	—	—	6:56	—	—
	—	—	5:36	—	—	5:37	—	—	5:39	—	—	5:40	—	—	5:43	—	—	5:44	—

Mount Si Weather (Days 0-3):

The weather forecast for Mount Si is: A dusting of new snow. Freeze-thaw conditions (max 1°C on Sat afternoon, min -7°C on Thu afternoon). Winds increasing (calm on Thu morning, strong winds from the ESE by Sat afternoon).

Mount Si Weather (Days 3-6):

A moderate fall of snow, heaviest on Mon morning. Freeze-thaw conditions (max 2°C on Sat night, min -3°C on Tue morning). Winds decreasing (strong winds from the ESE on Sat night, light winds from the WSW by Tue 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 10 closest weather stations

Weather Station	Temp.	Weather	Wind	Cloud Visibility Cloud / Visibility
Harman Heights wx 6 km SSW 251m alt. 2 hours ago	-1° C	-	Calm (0 kph at 358).
Black Diamond 32 km SSW 192m alt. 1 hour ago		-	Calm (2 kph at 221).
Renton Airport 36 km WSW 218m alt. 2 hours ago	3° C	Dry and partly cloudy.	Light winds from the NNE (6 kph at 20).	16 km Low: few Mid: scattered
Auburn 39 km SW 119m alt. 1 hour ago	3° C	Dry	Calm (0 kph at 11).
Stampede Pass Airport 40 km SE 628m alt. 2 hours ago	-5° C	Dry and cloudy.	Calm (0 kph at 0).	16 km Low: scattered Mid: overcast
Seattl / oeing Airport 44 km WSW 218m alt. 2 hours ago	3° C	Dry and cloudy.	Calm (0 kph at 0).	16 km Low: scattered Mid: overcast
Seattle Tacoma International Airport 44 km WSW 218m alt. 2 hours ago	2° C	Dry and partly cloudy.	Light winds from the NNE (7 kph at 20).	13 km Low: few Mid: broken
Snohomish 49 km NW 196m alt. 1 hour ago	1° C	-	Wind obs. (16 kph from 19 degs) was rejected.
SHIP3310 54 km W 15m alt. 2 hours ago			Calm (4 kph at 80).	- km
SHIP6487 54 km W 15m alt. 3 hours ago			Light winds from the ESE (10 kph at 110).	- 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.