– Lat/Long: 47.51° N 121.74° W

Mount Si
Weather Forecast, United States
Issued: 3 am Wed 17 Dec Local Time
Updates in:
hr min s
Update imminent

Issued: 3 am Wed 17 Dec Local Time

Updates in:

hr min s

Update imminent

2 Mount Si Elevations: 2 Forecast Elevations:

	Days 1–3 Weather Summary Heavy rain (total 23mm), heaviest during Thu afternoon. Later becoming colder with a dusting of snow on Thu night. Mild temperatures (max 7°C on Thu afternoon, min 1°C on Thu night). Winds increasing (light winds from the SW on Wed night, strong winds from the SW by Thu afternoon).									Days 4–6 Weather Summary A moderate fall of snow, heaviest on Sun morning. Turning milder with moderate rain (total 20mm), heaviest on Sun night. Freeze-thaw conditions (max 3°C on Sun afternoon, min 0°C on Mon night). Wind will be generally light.
	Wednesday 17			Thursday 18			Friday 19			Saturday 20			Sunday 21			Monday 22
	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night

	light rain	light rain	mod. rain	light rain	mod. rain	light snow	cloudy	light snow	snow shwrs	light rain	rain shwrs	light snow	light snow	light rain	mod. rain	light rain	light snow	mod. snow
km/h	WSW	SW	SSW	SE	SSW	WSW	SW	SW	WSW	SW	S	SSE	S	SSW	SSW	SSW	SW	SW
See all weather maps
cm	—	—	—	—	—	1	—	1	1	—	—	1	3	—	—	—	2	7
mm	3	2	6	4	6	2	—	—	—	1.8	1.3	—	3	4	6	4	—	—
max°C	3	3	3	3	7	5	2	2	2	2	2	1	2	3	2	3	2	1
min°C	2	3	3	3	6	1	1	2	1	2	1	1	1	2	1	2	1	0
chill°C	-4	-2	1	0	1	-4	-4	-3	-4	-2	-2	-2	-3	0	-2	-3	-2	-5

Freezing level (m)	800	900	1050	1050	2300	900	700	700	700	800	850	800	850	950	750	900	750	650
Cloud base (m)	450	450	400	400	300	500	400	400	550	400	400	850	500	400	500	450	400	400

	7:48	—	—	7:50	—	—	7:50	—	—	7:50	—	—	7:50	—	—	7:52	—	—
	—	4:15	—	—	4:16	—	—	4:16	—	—	4:16	—	—	4:17	—	—	4:17	—

Mount Si Weather (Days 0-3):

The weather forecast for Mount Si is: Heavy rain (total 23mm), heaviest during Thu afternoon. Later becoming colder with a dusting of snow on Thu night. Mild temperatures (max 7°C on Thu afternoon, min 1°C on Thu night). Winds increasing (light winds from the SW on Wed night, strong winds from the SW by Thu afternoon).

Mount Si Weather (Days 3-6):

A moderate fall of snow, heaviest on Sun morning. Turning milder with moderate rain (total 20mm), heaviest on Sun night. Freeze-thaw conditions (max 3°C on Sun afternoon, min 0°C on Mon night). Wind will be generally light.

This table gives the weather forecast for Mount Si at the specific elevation of 500 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
Black Diamond 32 km SSW 192m alt. 2 hours ago	9° C	Dry	Calm (0 kph at 0).
Renton Airport 36 km WSW 218m alt. 2 hours ago	8° C	Clear	Light winds from the SW.(Wind varies from 180 to 250 degs) (15 kph at 220).	16 km
Auburn 39 km SW 119m alt. 1 hour ago	-6° C	-	Calm (0 kph at 46).
Stampede Pass Airport 40 km SE 628m alt. 1 hour ago	-3° C	Light snow.	Moderate winds from the W.(Wind varies from 220 to 310 degs) (22 kph at 270).	3 km Mid: broken High: overcast
Seattl / oeing Airport 44 km WSW 218m alt. 2 hours ago	7° C	-	Light winds from the W (13 kph at 260).	16 km Low: few
Seattle Tacoma International Airport 44 km WSW 218m alt. 2 hours ago	7° C	-	Fresh winds from the SW (30 kph at 230).	16 km Low: few
Snohomish 49 km NW 196m alt. 1 hour ago	7° C	Dry	Light winds from the SW (14 kph at 227).
Seattle 49 km WSW 100m alt. 56 minutes ago	12° C	-	Calm (2 kph at 73).
BUOY-WPOW1 55 km W 3m alt. 1 hour ago	7° C		Moderate winds from the SW (26 kph at 230).
BUOY-TCNW1 57 km SW 3m alt. 1 hour ago

* 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.