– Lat/Long: 47.51° N 121.74° W

Mount Si
Weather Forecast, United States
Issued: 3 pm Mon 15 Dec Local Time
Updates in:
hr min s
Update imminent

Issued: 3 pm Mon 15 Dec Local Time

Updates in:

hr min s

Update imminent

2 Mount Si Elevations: 2 Forecast Elevations:

	Days 1–4 Weather Summary Heavy rain (total 65mm), heaviest during Tue night. Very mild (max 10°C on Tue night, min 2°C on Tue night). Winds increasing (light winds from the S on Mon night, strong winds from the WSW by Tue night).											Days 5–7 Weather Summary A light covering of new snow mostly falling on Thu night. Becoming milder with moderate rain (total 11mm) heaviest on Sun morning. Freeze-thaw conditions (max 6°C on Thu afternoon, min -1°C on Sat night). Winds decreasing (fresh winds from the WSW on Thu afternoon, calm by Sat afternoon).
	Mon 15		Tuesday 16			Wednesday 17			Thursday 18			Friday 19			Saturday 20
	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night

	rain shwrs	light rain	mod. rain	heavy rain	heavy rain	light rain	light rain	light rain	mod. rain	light rain	snow shwrs	snow shwrs	light snow	light snow	light snow	rain shwrs	some clouds
km/h	WSW	SW	SSW	SSW	WSW	WSW	SW	SSW	SSE	WSW	WSW	SW	SW	SW	SSW	SE	ESE
See all weather maps
cm	—	—	—	—	—	—	—	—	—	—	1	1	2	1	1	—	—
mm	6	4	8	11	22	2	2	2	7	3	0.8	1.4	—	—	—	0.1	—
max°C	9	5	9	9	10	3	3	3	5	6	2	2	2	2	3	2	2
min°C	6	5	6	8	2	2	3	3	4	5	0	1	2	1	2	0	-1
chill°C	2	1	2	4	-5	-4	-2	0	0	0	-4	-3	-2	-3	0	-2	-4

Freezing level (m)	1850	1200	1850	1850	1900	800	900	1000	1350	1300	700	700	750	700	800	850	0
Cloud base (m)	450	400	500	350	350	450	500	400	450	350	450	550	450	450	450	500	400

	—	—	7:48	—	—	7:48	—	—	7:50	—	—	7:50	—	—	7:50	—	—
	4:15	—	—	4:15	—	—	4:15	—	—	4:16	—	—	4:16	—	—	4:16	—

Mount Si Weather (Days 0-3):

The weather forecast for Mount Si is: Heavy rain (total 65mm), heaviest during Tue night. Very mild (max 10°C on Tue night, min 2°C on Tue night). Winds increasing (light winds from the S on Mon night, strong winds from the WSW by Tue night).

Mount Si Weather (Days 3-6):

A light covering of new snow mostly falling on Thu night. Becoming milder with moderate rain (total 11mm) heaviest on Sun morning. Freeze-thaw conditions (max 6°C on Thu afternoon, min -1°C on Sat night). Winds decreasing (fresh winds from the WSW on Thu afternoon, calm by Sat afternoon).

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 5 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 66).
Black Diamond 32 km SSW 192m alt. 1 hour ago	18° C	Dry	Calm (5 kph at 0).
Renton Airport 36 km WSW 218m alt. 3 hours ago	11° C	Dry and cloudy.	Moderate winds from the S (22 kph at 190).	16 km Low: overcast
Auburn 39 km SW 119m alt. 1 hour ago	1° C	-	Calm (0 kph at 103).
Stampede Pass Airport 40 km SE 628m alt. 3 hours ago	3° C	Dry and cloudy.	Light winds from the W.(Wind varies from 200 to 340 degs) (17 kph at 270).	16 km Low: broken Mid: broken High: overcast
Seattl / oeing Airport 44 km WSW 218m alt. 3 hours ago	11° C	Dry and partly cloudy.	Light winds from the S (19 kph at 180).	16 km Low: broken
Seattle Tacoma International Airport 44 km WSW 218m alt. 3 hours ago	10° C	Dry and partly cloudy.	Light winds from the SSW (19 kph at 200).	16 km Low: few Mid: scattered High: broken
Snohomish 49 km NW 196m alt. 48 minutes ago	9° C	Dry	Light winds from the SW (8 kph at 225).
Seattle 49 km WSW 100m alt. 1 hour ago	3° C	-
SHIP6500 54 km W 15m alt. 4 hours ago			Moderate winds from the SSE (23 kph at 160).	- km

* 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.