– Lat/Long: 47.51° N 121.74° W

Mount Si
Weather Forecast, United States
Issued: 3 am Sat 21 Dec Local Time
Updates in:
hr min s
Update imminent

Issued: 3 am Sat 21 Dec Local Time

Updates in:

hr min s

Update imminent

2 Mount Si Elevations: 2 Forecast Elevations:

	Days 1–3 Weather Summary Moderate rain (total 15mm), heaviest on Sun afternoon giving way to a moderate fall of snow, heaviest on Mon night. Freeze-thaw conditions (max 6°C on Mon afternoon, min 0°C on Sat afternoon). Mainly strong winds.									Days 4–6 Weather Summary A heavy fall of snow, heaviest during Wed night. Freeze-thaw conditions (max 1°C on Thu morning, min -3°C on Tue night). Winds increasing (light winds from the WSW on Tue morning, strong winds from the SW by Thu night).
	Saturday 21			Sunday 22			Monday 23			Tuesday 24			Wednesday 25			Thursday 26
	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night

	light snow	snow shwrs	some clouds	light snow	mod. rain	snow shwrs	clear	some clouds	mod. snow	light snow	light snow	light snow	cloudy	light snow	mod. snow	mod. snow	light snow	mod. snow
km/h	SSE	WSW	SW	SE	S	SW	SW	SE	SE	WSW	N	SW	SSW	ESE	ESE	SW	SW	SSW
See all weather maps
cm	3	2.0	—	1.0	—	2.0	—	—	6	1.0	2.0	1.0	—	1.0	10	7	2.0	7
mm	0.4	—	—	0.1	10	4	—	—	0.7	—	—	—	—	—	—	—	—	—
max°C	3	1	0	2	3	2	4	6	5	0	-1	-1	0	-1	0	1	1	1
min°C	1	0	0	2	2	0	1	6	0	0	-2	-3	-1	-2	-1	0	1	0
chill°C	-6	-6	-5	-2	-4	-7	-1	2	-4	-3	-6	-8	-6	-8	-8	-7	-6	-6

Freezing level (m)	1850	1400	1300	1650	1950	1500	1400	2750	2150	1350	1100	900	1050	950	1200	1150	1450	1500
Cloud base (m)	2400	450	1500	800	700	400	700		1850	400	450	450	650	1800	400	400	400	350

	7:52	—	—	7:52	—	—	7:52	—	—	7:52	—	—	7:52	—	—	7:54	—	—
	—	4:17	—	—	4:19	—	—	4:20	—	—	4:20	—	—	4:21	—	—	4:22	—

Mount Si Weather (Days 0-3):

The weather forecast for Mount Si is: Moderate rain (total 15mm), heaviest on Sun afternoon giving way to a moderate fall of snow, heaviest on Mon night. Freeze-thaw conditions (max 6°C on Mon afternoon, min 0°C on Sat afternoon). Mainly strong winds.

Mount Si Weather (Days 3-6):

A heavy fall of snow, heaviest during Wed night. Freeze-thaw conditions (max 1°C on Thu morning, min -3°C on Tue night). Winds increasing (light winds from the WSW on Tue morning, strong winds from the SW by Thu night).

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. 44 minutes ago	8° C	Dry	Calm (0 kph at 12).
Black Diamond 32 km SSW 192m alt. 2 hours ago	14° C	Dry	Calm (5 kph at 106).
Renton Airport 36 km WSW 218m alt. 2 hours ago	8° C	Dry and cloudy.	Light winds from the S (11 kph at 190).	16 km Low: few Mid: broken High: overcast
Auburn 39 km SW 119m alt. 2 hours ago	-2° C	-	Calm (0 kph at 76).
Stampede Pass Airport 40 km SE 628m alt. 2 hours ago	1° C	Fog -.	Light winds from the E (7 kph at 80).	1 km Low: scattered Mid: broken High: overcast
Seattl / oeing Airport 44 km WSW 218m alt. 2 hours ago	8° C	Dry and cloudy.	Calm (0 kph at 0).	16 km Low: few Mid: broken High: overcast
Seattle Tacoma International Airport 44 km WSW 218m alt. 2 hours ago	9° C	Dry and cloudy.	Light winds from the S (11 kph at 180).	16 km Low: broken Mid: overcast
Seattle 49 km WSW 100m alt. 1 hour ago	6° C	-	Light winds from the N (10 kph at 355).
BUOY-WPOW1 55 km W 3m alt. 56 minutes ago	11° C		Moderate winds from the S (28 kph at 170).
Puyallup 57 km SSW 160m alt. 45 minutes ago	7° C	Dry	Calm (0 kph at 154).

* 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.