– Lat/Long: 47.51° N 121.74° W

Mount Si
Weather Forecast, United States
Issued: 9 pm Sun 04 Jan Local Time
Updates in:
hr min s
Update imminent

Issued: 9 pm Sun 04 Jan Local Time

Updates in:

hr min s

Update imminent

2 Mount Si Elevations: 2 Forecast Elevations:

	Days 1–4 Weather Summary A heavy fall of snow, heaviest during Wed morning. Temperatures will be below freezing (max -1°C on Sun night, min -5°C on Tue night). Winds increasing (light winds from the SW on Mon morning, near gales from the SW by Tue afternoon).										Days 5–7 Weather Summary A heavy fall of snow, heaviest during Thu afternoon. Freeze-thaw conditions (max 5°C on Sat morning, min -5°C on Wed night). Winds decreasing (near gales from the WSW on Thu morning, light winds from the WSW by Fri night).
		Monday 5			Tuesday 6			Wednesday 7			Thursday 8			Friday 9			Saturday 10
	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night

	light snow	snow shwrs	cloudy	light snow	light snow	mod. snow	light snow	mod. snow	light snow	light snow	light snow	light snow	light snow	light snow	light snow	some clouds	some clouds	cloudy	cloudy
km/h	SSW	SW	WSW	SW	SSW	SW	WSW	SSW	SW	WSW	WSW	WSW	WSW	WSW	WSW	SW	SW	SW	SSW
See all weather maps
cm	3	2	—	2	4	6	4	6	4	5	3	4	4	3	1	—	—	—	—
mm	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—
max °C	-1	-3	-3	-3	-1	-2	-3	-4	-4	-5	-4	-5	-2	0	1	2	5	4	3
min °C	-2	-3	-3	-4	-3	-2	-5	-4	-5	-5	-5	-5	-4	-1	0	0	4	3	0
chill °C	-10	-10	-9	-12	-12	-11	-14	-13	-14	-13	-14	-14	-12	-8	-6	-4	1	-2	-6

Freezing level m	950	850	900	750	850	950	750	750	600	500	600	650	700	1000	1400	1500	2350	2200	1350
Cloud base (m)	700	450	450	550	400	400	450	500	450	400	400	450	650	450	450	650	9200	5600	2300

	—	7:54	—	—	7:54	—	—	7:52	—	—	7:52	—	—	7:52	—	—	7:52	—	—
	—	—	4:30	—	—	4:31	—	—	4:32	—	—	4:34	—	—	4:35	—	—	4:36	—

Mount Si Weather (Days 0-3):

The weather forecast for Mount Si is: A heavy fall of snow, heaviest during Wed morning. Temperatures will be below freezing (max -1°C on Sun night, min -5°C on Tue night). Winds increasing (light winds from the SW on Mon morning, near gales from the SW by Tue afternoon).

Mount Si Weather (Days 3-6):

A heavy fall of snow, heaviest during Thu afternoon. Freeze-thaw conditions (max 5°C on Sat morning, min -5°C on Wed night). Winds decreasing (near gales from the WSW on Thu morning, light winds from the WSW by Fri 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. 34 minutes ago	5° C	Dry	Calm (0 kph at 3).
Black Diamond 32 km SSW 192m alt. 1 hour ago		-	Calm (0 kph at 0).
Renton Airport 36 km WSW 218m alt. 2 hours ago	6° C	Light rain .	Calm (0 kph at 0).	10 km Mid: scattered High: broken
Auburn 39 km SW 119m alt. 24 minutes ago	-4° C	-	Calm (0 kph at 186).
Stampede Pass Airport 40 km SE 628m alt. 2 hours ago	-1° C	Moderate rain .	Calm (0 kph at 0).	10 km
SHIP7747 43 km W 15m alt. 2 hours ago			Light winds from the SSW (10 kph at 200).	- km
SHIP7075 43 km W 3m alt. 3 hours ago	7° C		Light winds from the SW (8 kph at 230).
SHIP9729 43 km W 15m alt. 3 hours ago			Light winds from the SW (8 kph at 230).	- km
SHIP9078 43 km W 15m alt. 3 hours ago			Light winds from the SW (8 kph at 230).	- km
SHIP469 43 km W -m alt. 2 hours ago	7° C	-	Light winds from the SSW (9 kph at 200).

* 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.