– Lat/Long: 47.51° N 121.74° W

Mount Si
Weather Forecast, United States
Issued: 9 am Thu 11 Dec Local Time
Updates in:
hr min s
Update imminent

Issued: 9 am Thu 11 Dec Local Time

Updates in:

hr min s

Update imminent

2 Mount Si Elevations: 2 Forecast Elevations:

	Days 1–3 Weather Summary Heavy rain (total 27mm), heaviest during Thu morning. Very mild (max 11°C on Sat morning, min 2°C on Thu morning). Winds decreasing (strong winds from the WSW on Thu night, light winds from the SSW by Fri night).									Days 4–6 Weather Summary Heavy rain (total 46mm) on Mon morning. Becoming colder with heavy fall of snow, heaviest during Tue afternoon. Freeze-thaw conditions (max 8°C on Sun night, min -4°C on Tue night). Mainly severe gales.
	Thursday 11			Friday 12			Saturday 13			Sunday 14			Monday 15			Tuesday 16
	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night

	mod. rain	mod. rain	mod. rain	light rain	light rain	rain shwrs	clear	some clouds	some clouds	light rain	light rain	heavy rain	heavy rain	mod. rain	light snow	light snow	heavy snow	mod. snow
km/h	SW	SW	WSW	WSW	WSW	SW	SW	SW	SW	SW	SSW	SSW	SW	SW	SW	SSW	SW	WSW
See all weather maps
cm	—	—	—	—	—	—	—	—	—	—	—	—	—	—	2	2	12	7
mm	9	6	9	1.4	0.9	0.6	—	—	—	0.1	0.6	12	16	5	3	8	—	—
max°C	3	5	6	6	5	7	11	10	9	7	7	8	7	7	3	3	1	-3
min°C	2	4	6	5	5	4	9	10	6	6	6	6	7	6	-1	0	1	-4
chill°C	-3	-1	0	0	0	0	6	7	2	1	2	1	1	-1	-7	-8	-6	-15

Freezing level (m)	2050	2650	2600	2950	3100	3400	3200	3100	2850	2500	2700	2550	2650	2450	1300	1350	1500	700
Cloud base (m)	450	450	450	450	550	550	8900	8800	5600	2350	1750	1950	400	400	400	450	350	400

	7:43	—	—	7:45	—	—	7:46	—	—	7:47	—	—	7:48	—	—	7:48	—	—
	—	4:15	—	—	4:15	—	—	4:15	—	—	4:15	—	—	4:15	—	—	4:15	—

Mount Si Weather (Days 0-3):

The weather forecast for Mount Si is: Heavy rain (total 27mm), heaviest during Thu morning. Very mild (max 11°C on Sat morning, min 2°C on Thu morning). Winds decreasing (strong winds from the WSW on Thu night, light winds from the SSW by Fri night).

Mount Si Weather (Days 3-6):

Heavy rain (total 46mm) on Mon morning. Becoming colder with heavy fall of snow, heaviest during Tue afternoon. Freeze-thaw conditions (max 8°C on Sun night, min -4°C on Tue night). Mainly severe gales.

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 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 178).
Black Diamond 32 km SSW 192m alt. 1 hour ago	22° C	Dry	Calm (3 kph at 69).
Renton Airport 36 km WSW 218m alt. 2 hours ago	9° C	Dry and cloudy.	Calm (0 kph at 0).	16 km Low: overcast
Auburn 39 km SW 119m alt. 2 hours ago	12° C	Dry	Calm (0 kph at 254).
Stampede Pass Airport 40 km SE 628m alt. 2 hours ago	2° C	Fog -.	Light winds from the N (6 kph at 1).	0 km
Seattl / oeing Airport 44 km WSW 218m alt. 2 hours ago	9° C	Dry and cloudy.	Light winds from the E (6 kph at 80).	14 km Low: overcast
Seattle Tacoma International Airport 44 km WSW 218m alt. 2 hours ago	8° C	Dry and cloudy.	Moderate winds from the ENE (20 kph at 70).	16 km Low: broken Mid: overcast
Snohomish 49 km NW 196m alt. 1 hour ago	9° C	Dry	Calm (2 kph at 211).
Seattle 49 km WSW 100m alt. 1 hour ago	13° C	-	Wind obs. (10 kph from 180 degs) was rejected.
SHIP8601 51 km W 15m alt. 3 hours ago			Calm (6 kph at 80).	- 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.