– Lat/Long: 47.51° N 121.74° W

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

Issued: 4 pm Sun 12 Apr Local Time

Updates in:

hr min s

Update imminent

2 Mount Si Elevations: 2 Forecast Elevations:

	Days 1–4 Weather Summary Mild at first with light rain (total 2mm) on Sun night followed by colder weather and light fall of snow, heaviest on Tue night. Freeze-thaw conditions (max 4°C on Sun afternoon, min -5°C on Tue night). Winds increasing (light winds from the WNW on Sun afternoon, gales from the SSW by Tue night).											Days 5–7 Weather Summary A moderate fall of snow, heaviest on Wed night. Freeze-thaw conditions (max 2°C on Sat morning, min -5°C on Wed night). Wind will be generally light.
	Sun 12		Monday 13			Tuesday 14			Wednesday 15			Thursday 16			Friday 17
	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night

	rain shwrs	light snow	light snow	light snow	cloudy	cloudy	light snow	light snow	snow shwrs	snow shwrs	snow shwrs	snow shwrs	cloudy	light snow	cloudy	some clouds	some clouds
km/h	NW	SW	SW	WSW	SW	SSW	SSW	SW	WSW	SSW	NNW	W	W	WSW	SW	W	W
See all weather maps
cm	—	2	1	1	—	—	2	4	1	5	7	1	—	3	—	—	—
mm	0.2	2	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—
max °C	4	4	-1	0	-1	-1	-1	0	-4	-4	-4	-4	-2	-1	-2	-1	-1
min °C	4	0	-1	0	-2	-2	-1	-5	-5	-4	-5	-4	-2	-3	-3	-1	-1
chill °C	2	-6	-8	-6	-9	-9	-9	-13	-13	-11	-11	-8	-6	-8	-5	-1	-1

Freezing level m	1950	1450	1200	1300	1000	1100	1200	600	750	800	600	850	1050	850	950	1150	1000
Cloud base (m)	750	400	450	400	550	600	400	400	450	450	450	450	650	450	450	650	750

	—	—	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 2mm) on Sun night followed by colder weather and light fall of snow, heaviest on Tue night. Freeze-thaw conditions (max 4°C on Sun afternoon, min -5°C on Tue night). Winds increasing (light winds from the WNW on Sun afternoon, gales from the SSW by Tue night).

Mount Si Weather (Days 3-6):

A moderate fall of snow, heaviest on Wed night. Freeze-thaw conditions (max 2°C on Sat morning, min -5°C on Wed night). Wind will be generally light.

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	13° C	Dry	Calm (0 kph at 347).
Snoqualmie Pass 30 km ESE 824m alt. 1 hour ago	7° C	-	Calm (0 kph at 175).
Renton 30 km WSW 160m alt. 55 minutes ago	11° C	Dry	Calm (0 kph at 254).
Black Diamond 32 km SSW 192m alt. 1 hour ago		-	Calm (5 kph at 0).
Grotto wx 35 km NE 321m alt. 2 hours ago	12° C	Dry	Light winds from the W (11 kph at 265).
Renton Airport 36 km WSW 218m alt. 3 hours ago	14° C	Dry and cloudy.	Light winds from the N (7 kph at 1).	16 km Low: few Mid: overcast
Grotto wx 39 km NE 1101m alt. 44 minutes ago	5° C	Dry	Calm (0 kph at 49).
Auburn 39 km SW 119m alt. 1 hour ago	21° C	Dry	Wind obs. (10 kph from 299 degs) was rejected.
Stampede Pass Airport 40 km SE 628m alt. 2 hours ago	4° C	Dry and cloudy.	Wind obs. (9 kph from 1 degs) was rejected.	16 km Low: few Mid: scattered High: overcast
Woodinville 43 km WNW 137.2m alt. 1 hour ago	11° C	Dry	Light winds from the WSW (11 kph at 242).

* 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.