– Lat/Long: 47.51° N 121.74° W

Mount Si
Weather Forecast, United States
Issued: 10 am Sun 15 Mar Local Time
Updates in:
hr min s
Update imminent

Issued: 10 am Sun 15 Mar Local Time

Updates in:

hr min s

Update imminent

2 Mount Si Elevations: 2 Forecast Elevations:

	Days 1–3 Weather Summary A dusting of snow. Milder later with heavy rain (total 47mm) on Tue night. Freeze-thaw conditions (max 7°C on Tue night, min -2°C on Sun morning). Winds increasing (calm on Sun morning, strong winds from the SW by Sun night).									Days 4–6 Weather Summary Heavy rain (total 58mm), mostly on Thu night. Becoming colder with a light covering of snow, mostly falling on Fri morning. Freeze-thaw conditions (max 7°C on Wed afternoon, min -5°C on Fri night). Winds decreasing (strong winds from the SW on Wed night, light winds from the WSW by Fri night).
	Sunday 15			Monday 16			Tuesday 17			Wednesday 18			Thursday 19			Friday 20
	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night

	cloudy	light snow	light snow	mod. rain	rain shwrs	rain shwrs	light rain	heavy rain	heavy rain	heavy rain	heavy rain	light rain	light rain	light rain	heavy rain	light snow	snow shwrs	light snow
km/h	SSE	SW	SW	SW	WSW	SW	SW	SW	SW	SW	SW	SSW	SW	SSW	WSW	SW	WSW	NW
See all weather maps
cm	—	2	1	—	—	—	—	—	—	—	—	—	—	—	—	2	1	3
mm	—	—	4	5	3	1.7	3	11	20	12	11	3	0.2	3	22	7	0.4	—
max °C	0	-1	4	4	6	6	6	6	7	6	7	7	7	6	7	2	2	0
min °C	-2	-1	1	4	6	4	5	6	6	5	6	6	6	5	3	2	2	-5
chill °C	-4	-4	-5	-2	1	-2	0	2	3	-1	1	1	0	-1	-3	-4	-4	-12

Freezing level m	1250	1050	2450	3100	2900	2650	2500	2650	2600	2600	2650	2650	3050	3050	2500	1550	1500	650
Cloud base (m)	2550	800	450	450	450	2400	550	500	400	400	400	1850	900	500	400	450	500	450

	7:20	—	—	7:18	—	—	7:16	—	—	7:13	—	—	7:11	—	—	7:09	—	—
	—	7:12	—	—	7:13	—	—	7:14	—	—	7:15	—	—	7:16	—	—	7:19	—

Mount Si Weather (Days 0-3):

The weather forecast for Mount Si is: A dusting of snow. Milder later with heavy rain (total 47mm) on Tue night. Freeze-thaw conditions (max 7°C on Tue night, min -2°C on Sun morning). Winds increasing (calm on Sun morning, strong winds from the SW by Sun night).

Mount Si Weather (Days 3-6):

Heavy rain (total 58mm), mostly on Thu night. Becoming colder with a light covering of snow, mostly falling on Fri morning. Freeze-thaw conditions (max 7°C on Wed afternoon, min -5°C on Fri night). Winds decreasing (strong winds from the SW on Wed night, light winds from the WSW 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 13).
Snoqualmie Pass 30 km ESE 824m alt. 23 minutes ago	4° C	-	Calm (0 kph at 60).
Black Diamond 32 km SSW 192m alt. 1 hour ago		-	Wind obs. (13 kph from 283 degs) was rejected.
Grotto wx 35 km NE 321m alt. 1 hour ago	6° C	Dry	Calm (3 kph at 30).
Baring wx 35 km NE 220m alt. 53 minutes ago	6° C	Dry	Light winds from the ESE (6 kph at 107).
Renton Airport 36 km WSW 218m alt. 2 hours ago	8° C	Dry and partly cloudy.	Wind obs. (13 kph from 360 degs) was rejected.	16 km Low: few Mid: scattered
Grotto wx 39 km NE 1101m alt. 54 minutes ago	1° C	-	Calm (0 kph at 341).
Auburn 39 km SW 119m alt. 50 minutes ago		-	Wind obs. (14 kph from 24 degs) was rejected.
Stampede Pass Airport 40 km SE 628m alt. 2 hours ago	-3° C	Dry and cloudy.	Calm (0 kph at 0).	16 km Low: overcast
Woodinville 43 km WNW 137.2m alt. 1 hour ago	3° C	Dry	Calm (5 kph at 110).

* 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.