– Lat/Long: 47.51° N 121.74° W

Mount Si
Weather Forecast, United States
Issued: 4 pm Fri 18 Apr Local Time
Updates in:
hr min s
Update imminent

Issued: 4 pm Fri 18 Apr 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 night. Freeze-thaw conditions (max 10°C on Fri afternoon, min -3°C on Sun night). Winds increasing (calm on Fri night, fresh winds from the WSW by Sun afternoon).											Days 5–7 Weather Summary Mostly dry. Freeze-thaw conditions (max 8°C on Thu morning, min -2°C on Mon afternoon). Winds increasing (calm on Wed morning, fresh winds from the ESE by Thu morning).
	Fri 18		Saturday 19			Sunday 20			Monday 21			Tuesday 22			Wednesday 23
	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night

	some clouds	cloudy	light rain	some clouds	cloudy	light snow	light snow	heavy snow	light snow	some clouds	some clouds	some clouds	some clouds	clear	clear	clear	some clouds
km/h	W	WSW	SW	WSW	SW	WSW	WSW	SW	SW	W	NNW	NNW	NW	NW	N	N	ESE
See all weather maps
cm	—	—	—	—	—	2.0	2.0	11	1.0	—	—	—	—	—	—	—	—
mm	—	—	0.3	—	—	—	—	—	—	—	—	—	—	—	—	—	—
max°C	10	9	2	4	1	-1	0	0	-2	0	0	-1	1	1	2	6	7
min°C	10	2	1	1	-1	-1	0	-3	-3	-2	-2	-2	0	0	1	5	6
chill°C	9	1	-3	-4	-5	-7	-6	-9	-7	-6	-5	-5	-2	-3	-2	4	4

Freezing level (m)	3050	2400	1500	1850	1100	1100	1300	850	1000	1250	1100	1200	1400	1450	1450	2250	2500
Cloud base (m)		2950	450	750	450	450	400	450	450	650	600	650	800	8150	800	1700

	—	—	6:11	—	—	6:09	—	—	6:07	—	—	6:05	—	—	6:03	—	—
	—	8:00	—	—	8:00	—	—	8:02	—	—	8:04	—	—	8:05	—	—	8:07

Mount Si Weather (Days 0-3):

The weather forecast for Mount Si is: A moderate fall of snow, heaviest on Sun night. Freeze-thaw conditions (max 10°C on Fri afternoon, min -3°C on Sun night). Winds increasing (calm on Fri night, fresh winds from the WSW by Sun afternoon).

Mount Si Weather (Days 3-6):

Mostly dry. Freeze-thaw conditions (max 8°C on Thu morning, min -2°C on Mon afternoon). Winds increasing (calm on Wed morning, fresh winds from the ESE by Thu morning).

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. 41 minutes ago	16° C	Dry	Calm (0 kph at 174).
Black Diamond 32 km SSW 192m alt. 58 minutes ago		-	Wind obs. (13 kph from 360 degs) was rejected.
Renton Airport 36 km WSW 218m alt. 2 hours ago	23° C	Clear	Light winds from the SW (7 kph at 220).	16 km
Auburn 39 km SW 119m alt. 56 minutes ago	8° C	Dry	Calm (2 kph at 51).
Stampede Pass Airport 40 km SE 628m alt. 2 hours ago	13° C	Clear	Wind obs. (11 kph from 1 degs) was rejected.	16 km
Seattl / oeing Airport 44 km WSW 218m alt. 2 hours ago	22° C	-	Wind obs. (9 kph from 170 degs) was rejected.	16 km Low: few
Seattle Tacoma International Airport 44 km WSW 218m alt. 2 hours ago	22° C	-	Light winds from the WSW (15 kph at 250).	16 km Low: few
Seattle 49 km WSW 100m alt. 1 hour ago	22° C	-	Wind obs. (8 kph from 146 degs) was rejected.
BUOY-WPOW1 55 km W 3m alt. 1 hour ago	13° C		Light winds from the NNE (18 kph at 30).
Puyallup 57 km SSW 160m alt. 32 minutes ago	18° C	Dry	Calm (0 kph at 325).

* 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.