– Lat/Long: 47.51° N 121.74° W

Mount Si
Weather Forecast, United States
Issued: 9 pm Sat 22 Nov Local Time
Updates in:
hr min s
Update imminent

Issued: 9 pm Sat 22 Nov Local Time

Updates in:

hr min s

Update imminent

2 Mount Si Elevations: 2 Forecast Elevations:

	Days 1–4 Weather Summary Moderate rain (total 18mm) heaviest on Sun morning, then becoming colder with a dusting of snow on Sun afternoon. Freeze-thaw conditions (max 4°C on Sat night, min -3°C on Sun night). Winds decreasing (fresh winds from the SW on Sun morning, calm by Mon night).										Days 5–7 Weather Summary A heavy fall of snow, heaviest during Tue night. Becoming milder with heavy rain (total 32mm) on Wed night. Freeze-thaw conditions (max 3°C on Tue night, min -1°C on Thu afternoon). Mainly strong winds.
		Sunday 23			Monday 24			Tuesday 25			Wednesday 26			Thursday 27			Friday 28
	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night

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

Freezing level (m)	1950	1750	1600	950	900	950	850	1250	1100	1650	2150	2050	1550	1700	1200	1100	1100	1150	1050
Cloud base (m)	400	400	400	750	500	700	450	500	2500	400	400	400	400	450	450	450	450	650	450

	—	7:22	—	—	7:24	—	—	7:26	—	—	7:26	—	—	7:28	—	—	7:30	—	—
	—	—	4:22	—	—	4:22	—	—	4:21	—	—	4:20	—	—	4:20	—	—	4:19	—

Mount Si Weather (Days 0-3):

The weather forecast for Mount Si is: Moderate rain (total 18mm) heaviest on Sun morning, then becoming colder with a dusting of snow on Sun afternoon. Freeze-thaw conditions (max 4°C on Sat night, min -3°C on Sun night). Winds decreasing (fresh winds from the SW on Sun morning, calm by Mon night).

Mount Si Weather (Days 3-6):

A heavy fall of snow, heaviest during Tue night. Becoming milder with heavy rain (total 32mm) on Wed night. Freeze-thaw conditions (max 3°C on Tue night, min -1°C on Thu afternoon). Mainly strong winds.

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. 2 hours ago	11° C	Dry	Calm (0 kph at 80).
Black Diamond 32 km SSW 192m alt. 2 hours ago	10° C	Dry	Calm (3 kph at 0).
Renton Airport 36 km WSW 218m alt. 2 hours ago	12° C	Light rain .	Light winds from the SSE (9 kph at 160).	16 km Low: few Mid: overcast
Stampede Pass Airport 40 km SE 628m alt. 2 hours ago	4° C	Fog -.	Wind obs. (6 kph from 1 degs) was rejected.	1 km
SHIP465 42 km WSW -m alt. 2 hours ago	11° C	-	Light winds from the SSE (13 kph at 150).
SHIP7749 42 km WSW 15m alt. 3 hours ago				- km
SHIP7292 42 km WSW 15m alt. 2 hours ago				- km
SHIP3382 42 km WSW 15m alt. 2 hours ago				- km
SHIP1738 42 km WSW 15m alt. 3 hours ago				- km
SHIP3740 42 km WSW 15m alt. 3 hours ago			Light winds from the SSE (15 kph at 160).	- 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.