– Lat/Long: 47.51° N 121.74° W

Mount Si Weather Forecast

Cascade Range · United States

Issued: 4 pm Mon 26 Oct Local Time

Updates in:

hr min s

Update imminent

Issued: 4 pm Mon 26 Oct 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 4mm) on Mon afternoon followed by colder weather and light fall of snow, heaviest on Tue night. Freeze-thaw conditions (max 3°C on Mon afternoon, min -1°C on Wed night). Winds increasing (calm on Mon afternoon, strong winds from the SW by Tue night).											Days 5–7 Weather Summary A moderate fall of snow, heaviest on Fri afternoon. Freeze-thaw conditions (max 2°C on Thu afternoon, min -1°C on Thu night). Wind will be generally light.
	Mon 26		Tuesday 27			Wednesday 28			Thursday 29			Friday 30			Saturday 31
	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night

	rain shwrs	light rain	snow shwrs	light snow	snow shwrs	light snow	light snow	clear	clear	clear	some clouds	cloudy	light snow	snow shwrs	cloudy	cloudy	mod. snow
Cloud base (m)	400	700	400	450	400	450	550	900	1600	2000	2150	650	700	800	800	850	450
km/h	WNW	W	WSW	SW	SW	SW	SSW	SSW	SE	ESE	SE	SSW	WSW	SSW	S	WSW	WSW
See all weather maps
cm	—	—	2	1	6	2	2	—	—	—	—	—	2	2	—	—	6
mm	3	0.4	—	0.8	—	—	—	—	—	—	—	—	—	—	—	—	—
max °C	3	2	2	2	1	1	1	0	1	2	1	0	0	0	0	0	-1
min °C	2	2	2	1	0	0	0	-1	0	2	-1	-1	0	-1	-1	0	-1
chill °C	2	1	-1	-6	-7	-7	-6	-5	-3	-1	-4	-5	0	-5	-4	-2	-6

Freezing level m	1750	1600	1550	1450	1400	1350	1350	1150	1450	1500	1200	1250	1200	1150	1250	1250	1100

	—	—	7:41	—	—	7:43	—	—	7:45	—	—	7:47	—	—	7:48	—	—
	5:59	—	—	5:58	—	—	5:55	—	—	5:53	—	—	5:52	—	—	5:51	—

Mount Si Weather (Days 0-3):

The weather forecast for Mount Si is: Mild at first with light rain (total 4mm) on Mon afternoon followed by colder weather and light fall of snow, heaviest on Tue night. Freeze-thaw conditions (max 3°C on Mon afternoon, min -1°C on Wed night). Winds increasing (calm on Mon afternoon, strong winds from the SW by Tue night).

Mount Si Weather (Days 3-6):

A moderate fall of snow, heaviest on Fri afternoon. Freeze-thaw conditions (max 2°C on Thu afternoon, min -1°C on Thu 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
Renton 30 km WSW 160m alt. 1 hour ago	14°C	Dry	Calm (0 kph at 278).
Renton Airport 36 km WSW 218m alt. 2 hours ago	14°C	Dry and partly cloudy.	Calm (0 kph at 0).	16 km Low: few Mid: broken
Auburn 39 km SW 119m alt. 2 hours ago	19°C	Dry	Calm (0 kph at 103).
Stampede Pass Airport 40 km SE 628m alt. 53 minutes ago	4°C	Light rain .	Calm (0 kph at 0).	10 km Mid: broken High: broken
Monroe 44 km NW 80m alt. 25 minutes ago	9°C	Dry	Calm (0 kph at 78).
Seattl / oeing Airport 44 km WSW 218m alt. 2 hours ago	14°C	Dry and partly cloudy.	Calm (0 kph at 0).	16 km Low: scattered Mid: scattered High: broken
Seattle Tacoma International Airport 44 km WSW 218m alt. 2 hours ago	13°C	Dry and partly cloudy.	Light winds from the W (7 kph at 280).	16 km Low: few Mid: broken High: broken
BUOY-EBSW1 46 km W 3m alt. 48 minutes ago
Snohomish 49 km NW 196m alt. 2 hours ago	12°C	Dry	Wind obs. (6 kph from 9 degs) was rejected.
Seattle 49 km WSW 100m alt. 35 minutes ago		-	Calm (0 kph at 40).

* 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.