– Lat/Long: 47.51° N 121.74° W

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

Issued: 9 pm Thu 11 Dec Local Time

Updates in:

hr min s

Update imminent

2 Mount Si Elevations: 2 Forecast Elevations:

	Days 1–4 Weather Summary Light rain (total 8mm), mostly falling on Thu night. Very mild (max 11°C on Sat morning, min 4°C on Fri night). Winds decreasing (strong winds from the WSW on Thu night, light winds from the SSW by Fri night).										Days 5–7 Weather Summary Heavy rain (total 78mm) on Tue afternoon. Becoming colder with heavy fall of snow, heaviest during Wed morning. Freeze-thaw conditions (max 8°C on Mon morning, min -4°C on Tue night). Winds decreasing (gales from the SW on Tue afternoon, moderate winds from the S by Wed afternoon).
		Friday 12			Saturday 13			Sunday 14			Monday 15			Tuesday 16			Wednesday 17
	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night

	mod. rain	rain shwrs	light rain	rain shwrs	clear	cloudy	rain shwrs	light rain	rain shwrs	heavy rain	heavy rain	heavy rain	light snow	heavy rain	light snow	mod. snow	light snow	light snow	heavy snow
km/h	WSW	WSW	WSW	SW	SW	SW	SW	SSW	SSW	SSW	SW	SW	SW	SW	WSW	WSW	SW	SSW	SW
See all weather maps
cm	—	—	—	—	—	—	—	—	—	—	—	—	3	—	3	6	5	4	12
mm	6	0.8	0.4	0.4	—	—	0.3	0.4	0.5	16	15	13	—	21	13	—	—	—	—
max°C	6	6	5	7	11	11	9	6	6	7	8	7	2	4	3	-3	-3	-2	-3
min°C	6	5	5	4	9	10	4	5	5	6	7	3	1	2	2	-4	-4	-2	-3
chill°C	1	0	0	0	6	8	-2	1	0	1	1	-5	-6	-5	-7	-13	-13	-10	-12

Freezing level (m)	2700	3000	3100	3400	3200	3100	2750	2350	2300	2450	2750	2550	1500	1700	1750	800	750	950	850
Cloud base (m)	450	450	550	650	9300	7100	5650	1850	850	750	400	450	700	350	350	400	400	400	350

	—	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: Light rain (total 8mm), mostly falling on Thu night. Very mild (max 11°C on Sat morning, min 4°C on Fri night). 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 78mm) on Tue afternoon. Becoming colder with heavy fall of snow, heaviest during Wed morning. Freeze-thaw conditions (max 8°C on Mon morning, min -4°C on Tue night). Winds decreasing (gales from the SW on Tue afternoon, moderate winds from the S by Wed afternoon).

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. 48 minutes ago	7° C	Dry	Calm (0 kph at 258).
Black Diamond 32 km SSW 192m alt. 40 minutes ago	9° C	Dry	Calm (0 kph at 0).
Renton Airport 36 km WSW 218m alt. 2 hours ago	9° C	Dry and cloudy.	Light winds from the S (6 kph at 180).	14 km Low: broken Mid: overcast
Auburn 39 km SW 119m alt. 52 minutes ago	-1° C	-	Calm (0 kph at 59).
Stampede Pass Airport 40 km SE 628m alt. 45 minutes ago	7° C	-	Light winds from the N (9 kph at 1).	0.0 km
Seattl / oeing Airport 44 km WSW 218m alt. 2 hours ago	8° C	Dry and cloudy.	Light winds from the S (6 kph at 170).	14 km Low: scattered Mid: broken High: overcast
Seattle Tacoma International Airport 44 km WSW 218m alt. 2 hours ago	8° C	Dry and cloudy.	Light winds from the WSW (6 kph at 240).	13 km Low: few Mid: overcast
Snohomish 49 km NW 196m alt. 29 minutes ago	7° C	Dry	Calm (0 kph at 13).
Seattle 49 km WSW 100m alt. 26 minutes ago	6° C	-
SHIP3950 51 km SW 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.