– Lat/Long: 47.51° N 121.74° W

Mount Si
Weather Forecast, United States
Issued: 4 pm Fri 10 Apr Local Time
Updates in:
hr min s
Update imminent

Issued: 4 pm Fri 10 Apr Local Time

Updates in:

hr min s

Update imminent

2 Mount Si Elevations: 2 Forecast Elevations:

	Days 1–4 Weather Summary Light rain (total 7mm) at first, then becoming colder with a dusting of snow on Sun night. Freeze-thaw conditions (max 11°C on Fri afternoon, min -2°C on Mon morning). Winds increasing (calm on Fri afternoon, strong winds from the SW by Sun night).											Days 5–7 Weather Summary A heavy fall of snow, heaviest during Tue morning. Temperatures will be below freezing (max 0°C on Mon afternoon, min -6°C on Tue night). Winds decreasing (gales from the SW on Tue afternoon, light winds from the W by Wed afternoon).
	Fri 10		Saturday 11			Sunday 12			Monday 13			Tuesday 14			Wednesday 15
	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night

	some clouds	some clouds	light rain	light rain	some clouds	rain shwrs	light rain	light snow	light snow	light snow	light snow	light snow	light snow	snow shwrs	light snow	snow shwrs	some clouds
km/h	NNW	W	SSW	SW	WSW	NNW	WNW	SW	SW	WSW	SW	SW	SW	WSW	WSW	NW	SW
See all weather maps
cm	—	—	—	—	—	—	—	1	1	1	1	4	4	7	4	2	—
mm	—	—	3	0.3	—	0.1	1.3	1.9	—	—	—	—	—	—	—	—	—
max °C	11	10	4	2	3	3	3	3	-1	0	-1	-1	-1	-2	-5	-3	-3
min °C	10	6	2	2	3	2	3	-1	-2	-1	-3	-2	-1	-6	-5	-4	-4
chill °C	9	6	-2	-3	0	2	0	-9	-10	-8	-11	-10	-10	-16	-12	-8	-8

Freezing level m	2700	2450	1750	1750	2000	1900	1850	1250	1100	1250	850	1000	1050	400	600	850	600
Cloud base (m)	3000	2700	400	400	650	750	600	400	450	400	500	400	400	450	400	500	800

	—	—	6:26	—	—	6:24	—	—	6:22	—	—	6:20	—	—	6:18	—	—
	7:49	—	—	7:50	—	—	7:51	—	—	7:52	—	—	7:53	—	—	7:55	—

Mount Si Weather (Days 0-3):

The weather forecast for Mount Si is: Light rain (total 7mm) at first, then becoming colder with a dusting of snow on Sun night. Freeze-thaw conditions (max 11°C on Fri afternoon, min -2°C on Mon morning). Winds increasing (calm on Fri afternoon, strong winds from the SW by Sun night).

Mount Si Weather (Days 3-6):

A heavy fall of snow, heaviest during Tue morning. Temperatures will be below freezing (max 0°C on Mon afternoon, min -6°C on Tue night). Winds decreasing (gales from the SW on Tue afternoon, light winds from the W by Wed 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. 45 minutes ago	16° C	Dry	Calm (0 kph at 342).
Snoqualmie Pass 30 km ESE 824m alt. 1 hour ago	9° C	-	Calm (0 kph at 236).
Renton 30 km WSW 160m alt. 2 hours ago	18° C	Dry	Calm (0 kph at 11).
Grotto wx 35 km NE 321m alt. 2 hours ago	19° C	Dry	Calm (5 kph at 252).
Renton Airport 36 km WSW 218m alt. 3 hours ago	16° C	Dry and partly cloudy.	Light winds from the N (7 kph at 0).	16 km Low: few Mid: scattered
Grotto wx 39 km NE 1101m alt. 48 minutes ago	7° C	Dry	Calm (0 kph at 277).
Stampede Pass Airport 40 km SE 628m alt. 3 hours ago	13° C	Clear	Wind obs. (6 kph from 1 degs) was rejected.	16 km
Woodinville 43 km WNW 137.2m alt. 1 hour ago	15° C	Dry	Calm (0 kph at 233).
Seattl / oeing Airport 44 km WSW 218m alt. 3 hours ago	19° C	Dry and partly cloudy.	Calm (0 kph at 0).	16 km Low: scattered Mid: broken
Seattle Tacoma International Airport 44 km WSW 218m alt. 3 hours ago	20° C	Dry and partly cloudy.	Light winds from the NNE (9 kph at 20).	16 km Low: few Mid: broken High: broken

* 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.