– Lat/Long: 47.51° N 121.74° W

Mount Si
Weather Forecast, United States
Issued: 3 am Wed 04 Mar Local Time
Updates in:
hr min s
Update imminent

Issued: 3 am Wed 04 Mar Local Time

Updates in:

hr min s

Update imminent

2 Mount Si Elevations: 2 Forecast Elevations:

	Days 1–3 Weather Summary A light fall of snow, heaviest on Wed afternoon. Turning milder with light rain (total 2mm) on Fri night. Freeze-thaw conditions (max 3°C on Fri night, min -3°C on Wed night). Wind will be generally light.									Days 4–6 Weather Summary Heavy rain (total 25mm) on Sat night. Becoming colder with heavy fall of snow, heaviest during Mon night. Freeze-thaw conditions (max 4°C on Sat night, min -6°C on Mon night). Winds decreasing (gales from the WSW on Sun afternoon, light winds from the NW by Mon afternoon).
	Wednesday 4			Thursday 5			Friday 6			Saturday 7			Sunday 8			Monday 9
	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night

	light snow	snow shwrs	light snow	light snow	cloudy	light snow	some clouds	some clouds	light rain	light rain	light rain	heavy rain	mod. rain	light snow	mod. snow	light snow	mod. snow	heavy snow
km/h	WSW	NW	SW	WSW	W	WSW	WNW	NW	SW	SW	WSW	WSW	WSW	WSW	SW	SW	W	WSW
See all weather maps
cm	2	4	4	2	—	2	—	—	—	—	—	—	—	2	7	4	9	15
mm	—	—	—	—	—	—	—	—	2	1.7	2	14	7	—	—	—	—	—
max °C	1	1	1	-2	-1	-1	1	2	3	3	3	4	3	1	-3	-4	-4	-6
min °C	1	0	-3	-3	-2	-2	0	2	2	3	3	3	2	-2	-5	-5	-5	-6
chill °C	-4	-4	-10	-9	-6	-8	-2	1	2	-1	-2	-4	-6	-11	-13	-13	-8	-15

Freezing level m	1400	1350	1050	900	1050	950	1250	1450	1950	2550	2250	2300	1900	1450	700	550	650	400
Cloud base (m)	400	400	450	550	450	450	500	650	2000	450	450	500	400	400	400	400	400	450

	6:41	—	—	6:39	—	—	6:37	—	—	6:35	—	—	7:33	—	—	6:31	—	—
	—	5:55	—	—	5:58	—	—	5:59	—	—	6:00	—	—	7:01	—	—	6:02	—

Mount Si Weather (Days 0-3):

The weather forecast for Mount Si is: A light fall of snow, heaviest on Wed afternoon. Turning milder with light rain (total 2mm) on Fri night. Freeze-thaw conditions (max 3°C on Fri night, min -3°C on Wed night). Wind will be generally light.

Mount Si Weather (Days 3-6):

Heavy rain (total 25mm) on Sat night. Becoming colder with heavy fall of snow, heaviest during Mon night. Freeze-thaw conditions (max 4°C on Sat night, min -6°C on Mon night). Winds decreasing (gales from the WSW on Sun afternoon, light winds from the NW by Mon 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 10 closest weather stations

Weather Station	Temp.	Weather	Wind	Cloud Visibility Cloud / Visibility
Harman Heights wx 6 km SSW 251m alt. 2 hours ago	9° C	Light rain.	Calm (0 kph at 355).
Black Diamond 32 km SSW 192m alt. 55 minutes ago	9° C	Dry	Calm (0 kph at 260).
Renton Airport 36 km WSW 218m alt. 3 hours ago	9° C	Light rain .	Calm (0 kph at 0).	14 km Low: few Mid: overcast
Auburn 39 km SW 119m alt. 49 minutes ago	-1° C	-	Calm (0 kph at 82).
Stampede Pass Airport 40 km SE 628m alt. 2 hours ago	2° C	Light rain .	Calm (0 kph at 0).	16 km Low: scattered Mid: overcast
SHIP3191 42 km WSW 15m alt. 2 hours ago			Light winds from the SSE (10 kph at 160).	- km
SHIP4256 42 km WSW 3m alt. 2 hours ago	10° C		Light winds from the SSE (9 kph at 160).
SHIP7134 42 km WSW 3m alt. 2 hours ago	10° C		Light winds from the SSE (9 kph at 160).
SHIP6185 42 km WSW 15m alt. 2 hours ago			Light winds from the SSE (10 kph at 160).	- km
SHIP7936 42 km WSW 15m alt. 1 hour ago			Calm (6 kph at 140).	- 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.