– Lat/Long: 47.51° N 121.74° W

Mount Si Weather Forecast

Cascade Range · United States

Issued: 10 am Fri 18 Sep Local Time

Updates in:

hr min s

Update imminent

Issued: 10 am Fri 18 Sep Local Time

Updates in:

hr min s

Update imminent

2 Mount Si Elevations: 2 Forecast Elevations:

	Days 1–3 Weather Summary Mostly dry. Warm (max 21°C on Sun afternoon, min 13°C on Fri morning). Wind will be generally light.									Days 4–6 Weather Summary Some drizzle, heaviest during Wed night. Very mild (max 18°C on Mon afternoon, min 10°C on Tue night). Wind will be generally light.
	Friday 18			Saturday 19			Sunday 20			Monday 21			Tuesday 22			Wednesday 23
	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night

	clear	clear	clear	clear	clear	clear	clear	clear	clear	some clouds	some clouds	some clouds	cloudy	clear	clear	cloudy	cloudy	light rain
Cloud base (m)	9500		9250	8600	8700					6950	7750		6300	8900		4900	2450	2250
km/h	WNW	WNW	E	WNW	NW	ESE	WNW	NW	ESE	WNW	WNW	E	NW	WNW	ESE	WNW	NW	N
See all weather maps
cm	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—
mm	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	1.4
max °C	17	20	15	18	20	16	19	21	16	17	18	14	13	16	12	15	16	14
min °C	13	19	13	14	20	13	14	21	13	13	18	11	11	16	10	11	15	11
chill °C	13	19	13	14	20	13	14	21	13	13	18	11	11	16	10	11	15	11

Freezing level m	3750	3800	3900	3850	3900	4000	4050	4050	4000	3800	3750	3850	3600	3450	3300	3300	3000	3200

	6:47	—	—	6:48	—	—	6:50	—	—	6:50	—	—	6:52	—	—	6:54	—	—
	—	7:13	—	—	7:10	—	—	7:08	—	—	7:07	—	—	7:05	—	—	7:02	—

Mount Si Weather (Days 0-3):

The weather forecast for Mount Si is: Mostly dry. Warm (max 21°C on Sun afternoon, min 13°C on Fri morning). Wind will be generally light.

Mount Si Weather (Days 3-6):

Some drizzle, heaviest during Wed night. Very mild (max 18°C on Mon afternoon, min 10°C on Tue night). Wind will be generally light.

This table gives the weather forecast for Mount Si at the specific elevation of 500 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. 53 minutes ago	14°C	Dry	Calm (2 kph at 117).
Black Diamond 32 km SSW 192m alt. 1 hour ago		-	Calm (5 kph at 116).
Renton Airport 36 km WSW 218m alt. 2 hours ago	16°C	Dry and cloudy.	Light winds from the S (11 kph at 190).	16 km Low: overcast
Auburn 39 km SW 119m alt. 34 minutes ago	24°C	Dry	Calm (0 kph at 329).
Stampede Pass Airport 40 km SE 628m alt. 2 hours ago	11°C	Clear	Wind obs. (9 kph from 1 degs) was rejected.	16 km
Monroe 44 km NW 80m alt. 1 hour ago	19°C	Dry	Calm (0 kph at 273).
Seattl / oeing Airport 44 km WSW 218m alt. 2 hours ago	16°C	Dry and cloudy.	Light winds from the SSE (15 kph at 160).	16 km Low: overcast
Seattle Tacoma International Airport 44 km WSW 218m alt. 1 hour ago	16°C	Dry and cloudy.	Light winds from the S (15 kph at 170).	16 km Low: overcast
BUOY-EBSW1 46 km W 3m alt. 57 minutes ago
Snohomish 49 km NW 196m alt. 1 hour ago	18°C	Dry	Calm (2 kph at 205).

* 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.