– Lat/Long: 47.51° N 121.74° W

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

Issued: 4 pm Tue 12 May Local Time

Updates in:

hr min s

Update imminent

2 Mount Si Elevations: 2 Forecast Elevations:

	Days 1–4 Weather Summary A light covering of new snow mostly falling on Wed morning will be washed away by heavy rain (total 31mm) on Wed morning. Freeze-thaw conditions (max 19°C on Tue afternoon, min -1°C on Fri morning). Winds increasing (calm on Tue night, near gales from the WSW by Wed afternoon).											Days 5–7 Weather Summary A moderate fall of snow, heaviest on Sat night. Freeze-thaw conditions (max 3°C on Sun afternoon, min -2°C on Sat night). Winds decreasing (fresh winds from the SW on Fri afternoon, calm by Sun morning).
	Tue 12		Wednesday 13			Thursday 14			Friday 15			Saturday 16			Sunday 17
	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night

	some clouds	rain shwrs	light snow	heavy rain	light rain	light rain	light rain	snow shwrs	cloudy	light snow	light snow	light snow	light snow	snow shwrs	some clouds	rain shwrs	cloudy
km/h	W	SW	WSW	WSW	WSW	WSW	WSW	SW	SW	SW	WSW	WSW	WSW	NNW	NNW	WNW	W
See all weather maps
cm	—	—	4	—	—	—	—	2	—	3	5	1	3	6	—	—	—
mm	—	8	8	11	0.7	0.8	1	1.2	—	—	—	—	—	—	—	0.1	—
max °C	19	13	2	4	3	2	5	3	0	0	0	-1	0	0	-1	3	3
min °C	16	5	2	3	1	1	3	0	-1	0	-1	-1	0	-2	-1	2	2
chill °C	16	2	-3	-4	-6	-5	-2	-7	-8	-6	-8	-7	-5	-7	-5	1	1

Freezing level m	3600	3100	1700	1950	1500	1550	1850	1500	1250	1250	1100	1150	1200	1050	1200	1700	1800
Cloud base (m)		400	400	400	450	550	600	400	500	500	450	450	450	400	550	850	1750

	—	—	5:31	—	—	5:31	—	—	5:30	—	—	5:28	—	—	5:26	—	—
	—	8:32	—	—	8:34	—	—	8:35	—	—	8:37	—	—	8:37	—	—	8:38

Mount Si Weather (Days 0-3):

The weather forecast for Mount Si is: A light covering of new snow mostly falling on Wed morning will be washed away by heavy rain (total 31mm) on Wed morning. Freeze-thaw conditions (max 19°C on Tue afternoon, min -1°C on Fri morning). Winds increasing (calm on Tue night, near gales from the WSW by Wed afternoon).

Mount Si Weather (Days 3-6):

A moderate fall of snow, heaviest on Sat night. Freeze-thaw conditions (max 3°C on Sun afternoon, min -2°C on Sat night). Winds decreasing (fresh winds from the SW on Fri afternoon, calm by Sun morning).

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	15° C	Dry	Calm (0 kph at 329).
Renton 30 km WSW 160m alt. 47 minutes ago	17° C	Dry	Wind obs. (6 kph from 227 degs) was rejected.
Black Diamond 32 km SSW 192m alt. 1 hour ago		-	Calm (5 kph at 0).
Grotto wx 35 km NE 321m alt. 42 minutes ago	21° C	Dry	Calm (3 kph at 244).
Renton Airport 36 km WSW 218m alt. 3 hours ago	21° C	Dry and partly cloudy.	Light winds from the S (9 kph at 170).	16 km Low: broken
Grotto wx 39 km NE 1101m alt. 1 hour ago	15° C	Dry	Calm (2 kph at 320).
Auburn 39 km SW 119m alt. 56 minutes ago	16° C	Dry	Calm (0 kph at 204).
Stampede Pass Airport 40 km SE 628m alt. 3 hours ago	16° C	Clear	Light winds from the N (7 kph at 1).	16 km
Woodinville 43 km WNW 137.2m alt. 1 hour ago	13° C	Dry	Calm (0 kph at 225).
Seattl / oeing Airport 44 km WSW 218m alt. 3 hours ago	21° C	Dry and partly cloudy.	Calm (0 kph at 0).	16 km Low: scattered

* 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.