– Lat/Long: 47.51° N 121.74° W

Mount Si
Weather Forecast, United States
Issued: 4 am Sun 12 Apr Local Time
Updates in:
hr min s
Update imminent

Issued: 4 am Sun 12 Apr Local Time

Updates in:

hr min s

Update imminent

2 Mount Si Elevations: 2 Forecast Elevations:

	Days 1–3 Weather Summary Mild at first with light rain (total 3mm) on Sun night followed by colder weather and light fall of snow, heaviest on Tue night. Freeze-thaw conditions (max 5°C on Sun afternoon, min -5°C on Tue night). Winds increasing (calm on Sun morning, gales from the SSW by Tue night).									Days 4–6 Weather Summary A moderate fall of snow, heaviest on Wed afternoon. Temperatures will be below freezing (max -1°C on Fri afternoon, min -5°C on Wed morning). Winds decreasing (fresh winds from the WSW on Wed afternoon, calm by Fri night).
	Sunday 12			Monday 13			Tuesday 14			Wednesday 15			Thursday 16			Friday 17
	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night

	clear	light rain	light snow	light snow	light snow	light snow	cloudy	light snow	mod. snow	light snow	mod. snow	snow shwrs	some clouds	some clouds	snow shwrs	some clouds	some clouds	some clouds
km/h	NW	NW	SW	SW	WSW	WSW	SW	SSW	SW	SW	WSW	NW	WNW	W	WNW	W	WNW	NNW
See all weather maps
cm	—	—	2	2	2	1	—	2	6	3	6	2	—	—	2	—	—	—
mm	—	0.2	3	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—
max °C	4	5	4	-1	0	-1	-1	-1	0	-5	-3	-4	-3	-2	-2	-2	-1	-1
min °C	4	4	0	-1	0	-2	-2	-1	-5	-5	-3	-5	-4	-2	-3	-3	-2	-2
chill °C	4	2	-7	-8	-6	-9	-10	-9	-14	-14	-10	-9	-7	-5	-7	-5	-2	-2

Freezing level m	1900	2000	1350	1150	1250	1000	1100	1150	600	700	850	550	900	1100	950	1000	1200	1000
Cloud base (m)	650	850	400	450	400	550	550	400	500	450	550	450	500	600	650	450	600	800

	6:24	—	—	6:22	—	—	6:20	—	—	6:18	—	—	6:16	—	—	6:15	—	—
	—	7:51	—	—	7:52	—	—	7:53	—	—	7:55	—	—	7:57	—	—	7:58	—

Mount Si Weather (Days 0-3):

The weather forecast for Mount Si is: Mild at first with light rain (total 3mm) on Sun night followed by colder weather and light fall of snow, heaviest on Tue night. Freeze-thaw conditions (max 5°C on Sun afternoon, min -5°C on Tue night). Winds increasing (calm on Sun morning, gales from the SSW by Tue night).

Mount Si Weather (Days 3-6):

A moderate fall of snow, heaviest on Wed afternoon. Temperatures will be below freezing (max -1°C on Fri afternoon, min -5°C on Wed morning). Winds decreasing (fresh winds from the WSW on Wed afternoon, calm by Fri 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 10 closest weather stations

Weather Station	Temp.	Weather	Wind	Cloud Visibility Cloud / Visibility
Harman Heights wx 6 km SSW 251m alt. 1 hour ago	9° C	Dry	Calm (0 kph at 327).
Snoqualmie Pass 30 km ESE 824m alt. 34 minutes ago	-2° C	-	Calm (0 kph at 46).
Renton 30 km WSW 160m alt. 2 hours ago	7° C	Dry	Calm (0 kph at 18).
Grotto wx 35 km NE 321m alt. 1 hour ago	6° C	Dry	Calm (5 kph at 78).
Renton Airport 36 km WSW 218m alt. 1 hour ago	9° C	Dry and cloudy.	Light winds from the N (7 kph at 0).	16 km Low: overcast
Grotto wx 39 km NE 1101m alt. 53 minutes ago	-1° C	-	Calm (0 kph at 352).
Auburn 39 km SW 119m alt. 2 hours ago	4° C	Dry	Calm (0 kph at 197).
Stampede Pass Airport 40 km SE 628m alt. 2 hours ago	3° C	Dry and partly cloudy.	Calm (0 kph at 0).	16 km Low: scattered
Woodinville 43 km WNW 137.2m alt. 38 minutes ago	1° C	-	Calm (2 kph at 306).
Seattl / oeing Airport 44 km WSW 218m alt. 2 hours ago	9° C	Dry and cloudy.	Calm (0 kph at 0).	11 km Low: overcast

* 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.