– Lat/Long: 47.51° N 121.74° W

Mount Si
Weather Forecast, United States
Issued: 9 am Fri 12 Dec Local Time
Updates in:
hr min s
Update imminent

Issued: 9 am Fri 12 Dec Local Time

Updates in:

hr min s

Update imminent

2 Mount Si Elevations: 2 Forecast Elevations:

	Days 1–3 Weather Summary Moderate rain (total 20mm), heaviest on Sun night. Very mild (max 10°C on Sat morning, min 4°C on Fri night). Winds increasing (light winds from the SW on Fri night, gales from the SSW by Sun night).									Days 4–6 Weather Summary Heavy rain (total 35mm) on Tue afternoon. Becoming colder with heavy fall of snow, heaviest during Tue afternoon. Freeze-thaw conditions (max 8°C on Mon morning, min -4°C on Tue night). Winds increasing (moderate winds from the SW on Mon night, gales from the WSW by Tue night).
	Friday 12			Saturday 13			Sunday 14			Monday 15			Tuesday 16			Wednesday 17
	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night

	rain shwrs	rain shwrs	rain shwrs	clear	some clouds	rain shwrs	light rain	rain shwrs	heavy rain	heavy rain	light rain	light snow	mod. rain	mod. snow	light snow	light snow	light snow	light snow
km/h	WSW	WSW	SW	SW	SW	SW	SW	SSW	SSW	SW	SW	SW	WSW	S	WSW	SW	SW	SSW
See all weather maps
cm	—	—	—	—	—	—	—	—	—	—	—	3	—	7	4	2	1	3
mm	0.7	0.6	0.6	—	—	1.7	0.6	0.2	15	14	3	1.4	7	10	—	—	—	—
max°C	5	5	7	10	10	8	5	6	8	8	3	2	3	3	-3	-3	-2	-1
min°C	5	5	4	9	9	4	5	5	6	7	1	1	2	1	-4	-3	-2	-2
chill°C	0	0	0	6	6	-2	1	0	1	1	-7	-6	-5	-7	-15	-13	-10	-10

Freezing level (m)	3000	3000	3400	3150	3000	2500	2300	2200	2550	2750	1750	1350	1700	1850	750	900	950	950
Cloud base (m)	450	650	650	9000	7100		650	650	400	400	450	400	400	350	450	450	500	600

	7:45	—	—	7:46	—	—	7:47	—	—	7:48	—	—	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: Moderate rain (total 20mm), heaviest on Sun night. Very mild (max 10°C on Sat morning, min 4°C on Fri night). Winds increasing (light winds from the SW on Fri night, gales from the SSW by Sun night).

Mount Si Weather (Days 3-6):

Heavy rain (total 35mm) on Tue afternoon. Becoming colder with heavy fall of snow, heaviest during Tue afternoon. Freeze-thaw conditions (max 8°C on Mon morning, min -4°C on Tue night). Winds increasing (moderate winds from the SW on Mon night, gales from the WSW by Tue 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 5 closest weather stations

Weather Station	Temp.	Weather	Wind	Cloud Visibility Cloud / Visibility
Harman Heights wx 6 km SSW 251m alt. 43 minutes ago	10° C	Dry	Calm (0 kph at 217).
Black Diamond 32 km SSW 192m alt. 1 hour ago	23° C	Dry	Calm (3 kph at 0).
Renton Airport 36 km WSW 218m alt. 2 hours ago	12° C	Dry and partly cloudy.	Light winds from the N (7 kph at 10).	16 km Low: scattered Mid: broken
Auburn 39 km SW 119m alt. 1 hour ago	15° C	Dry	Calm (0 kph at 143).
Stampede Pass Airport 40 km SE 628m alt. 1 hour ago	5° C	Dry and cloudy.	Light winds from the W.(Wind varies from 007 to 012 degs) (17 kph at 270).	16 km Low: overcast
Seattl / oeing Airport 44 km WSW 218m alt. 2 hours ago	12° C	Dry and cloudy.	Light winds from the S (6 kph at 190).	16 km Low: overcast
Seattle Tacoma International Airport 44 km WSW 218m alt. 2 hours ago	12° C	Dry and partly cloudy.	Calm (0 kph at 0).	11 km Low: broken Mid: broken
Snohomish 49 km NW 196m alt. 1 hour ago	8° C	Dry	Calm (0 kph at 90).
Seattle 49 km WSW 100m alt. 1 hour ago	17° C	-
SHIP4511 50 km WSW 15m alt. 3 hours ago				- 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.