– Lat/Long: 47.51° N 121.74° W

Mount Si Weather Forecast

Cascade Range · United States

Issued: 10 pm Mon 05 Oct Local Time

Updates in:

hr min s

Update imminent

Issued: 10 pm Mon 05 Oct Local Time

Updates in:

hr min s

Update imminent

2 Mount Si Elevations: 2 Forecast Elevations:

	Days 1–4 Weather Summary Mostly dry. Very mild (max 17°C on Wed afternoon, min 12°C on Mon night). Wind will be generally light.										Days 5–7 Weather Summary Light rain (total 8mm) at first, then becoming colder with a dusting of snow on Fri night. Freeze-thaw conditions (max 14°C on Thu night, min 0°C on Sat morning). Winds decreasing (strong winds from the WSW on Fri morning, calm by Sat afternoon).
		Tuesday 6			Wednesday 7			Thursday 8			Friday 9			Saturday 10
	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night

	clear	some clouds	clear	clear	clear	clear	clear	clear	clear	some clouds	light rain	light rain	light snow	some clouds	some clouds	some clouds
Cloud base (m)	9550		8500	9400				9650	9150	8500	650	400	400	450	550	2000
km/h	N	N	N	N	N	N	N	NNW	NNW	SW	WSW	WNW	SW	SSW	N	ENE
See all weather maps
cm	—	—	—	—	—	—	—	—	—	—	—	—	1	—	—	—
mm	—	—	—	—	—	—	—	—	—	—	0.4	4	3	—	—	—
max °C	12	14	15	15	16	17	16	16	17	14	7	6	3	0	2	2
min °C	12	12	15	14	15	17	15	15	16	8	7	5	1	0	1	2
chill °C	12	10	15	13	15	16	14	14	16	5	2	2	-4	-6	1	1

Freezing level m	4100	4050	4100	4200	4050	4050	4100	4150	4100	3950	2700	2100	1500	1350	1500	1650

	—	7:11	—	—	7:13	—	—	7:15	—	—	7:16	—	—	7:16	—	—
	—	—	6:37	—	—	6:35	—	—	6:32	—	—	6:30	—	—	6:29	—

Mount Si Weather (Days 0-3):

The weather forecast for Mount Si is: Mostly dry. Very mild (max 17°C on Wed afternoon, min 12°C on Mon night). Wind will be generally light.

Mount Si Weather (Days 3-6):

Light rain (total 8mm) at first, then becoming colder with a dusting of snow on Fri night. Freeze-thaw conditions (max 14°C on Thu night, min 0°C on Sat morning). Winds decreasing (strong winds from the WSW on Fri morning, calm by Sat 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
Black Diamond 32 km SSW 192m alt. 53 minutes ago		-	Calm (5 kph at 0).
Renton Airport 36 km WSW 218m alt. 2 hours ago	14°C	Clear	Calm (0 kph at 0).	16 km
Auburn 39 km SW 119m alt. 50 minutes ago	11°C	Dry	Calm (0 kph at 207).
Stampede Pass Airport 40 km SE 628m alt. 2 hours ago	10°C	Fog -.	Wind obs. (7 kph from 200 degs) was rejected.	1 km
Monroe 44 km NW 80m alt. 51 minutes ago	8°C	Dry	Calm (0 kph at 28).
Seattl / oeing Airport 44 km WSW 218m alt. 2 hours ago	14°C	Clear	Calm (0 kph at 0).	16 km
Seattle Tacoma International Airport 44 km WSW 218m alt. 2 hours ago	16°C	-	Light winds from the NNE (13 kph at 30).	16 km Low: few
BUOY-EBSW1 46 km W 3m alt. 1 hour ago
Snohomish 49 km NW 196m alt. 3 hours ago	12°C	Dry	Calm (0 kph at 109).
Seattle 49 km WSW 100m alt. 2 hours ago	22°C	-

* 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.