– Lat/Long: 47.51° N 121.74° W

Mount Si
Weather Forecast, United States
Issued: 10 pm Mon 09 Mar Local Time
Updates in:
hr min s
Update imminent

Issued: 10 pm Mon 09 Mar Local Time

Updates in:

hr min s

Update imminent

2 Mount Si Elevations: 2 Forecast Elevations:

	Days 1–4 Weather Summary Moderate rain (total 13mm) on Wed night. Becoming colder with heavy fall of snow, heaviest during Thu afternoon. Freeze-thaw conditions (max 3°C on Wed night, min -7°C on Mon night). Winds increasing (light winds from the SW on Tue morning, stormy winds from the SW by Wed night).										Days 5–7 Weather Summary A heavy fall of snow, heaviest during Thu night. Becoming milder with heavy rain (total 42mm) on Thu night. Freeze-thaw conditions (max 3°C on Thu night, min -7°C on Sat morning). Winds decreasing (severe gales from the SW on Thu night, calm by Sun morning).
		Tuesday 10			Wednesday 11			Thursday 12			Friday 13			Saturday 14			Sunday 15
	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night

	mod. snow	snow shwrs	light snow	light snow	mod. snow	mod. snow	light snow	light snow	mod. snow	heavy snow	mod. snow	light snow	mod. snow	snow shwrs	snow shwrs	some clouds	some clouds	some clouds	cloudy
km/h	WSW	SW	SW	WSW	SW	SW	WSW	WSW	WSW	SW	WSW	WSW	NNW	WNW	NNW	N	SE	SSW	WSW
See all weather maps
cm	9	1	2	5	7	7	3	5	10	11	6	3	10	3	1	—	—	—	—
mm	—	—	—	—	—	—	13	—	—	28	14	—	—	—	—	—	—	—	—
max °C	-6	-6	-4	-3	-2	1	3	-3	-2	3	3	-2	-4	-7	-5	-5	-2	0	2
min °C	-7	-7	-5	-4	-3	-1	-2	-3	-3	-1	0	-3	-6	-7	-6	-6	-3	0	0
chill °C	-16	-14	-14	-13	-10	-10	-11	-12	-11	-8	-8	-8	-11	-13	-12	-12	-5	-3	-3

Freezing level m	350	550	600	700	900	1500	1250	850	800	1800	1200	700	350	450	600	0	950	1350	1850
Cloud base (m)	550	450	700	450	450	400	450	450	400	400	400	400	400	500	550	450	2400	2300	2400

	—	7:30	—	—	7:28	—	—	7:26	—	—	7:24	—	—	7:22	—	—	7:20	—	—
	—	—	7:04	—	—	7:06	—	—	7:07	—	—	7:08	—	—	7:09	—	—	7:12	—

Mount Si Weather (Days 0-3):

The weather forecast for Mount Si is: Moderate rain (total 13mm) on Wed night. Becoming colder with heavy fall of snow, heaviest during Thu afternoon. Freeze-thaw conditions (max 3°C on Wed night, min -7°C on Mon night). Winds increasing (light winds from the SW on Tue morning, stormy winds from the SW by Wed night).

Mount Si Weather (Days 3-6):

A heavy fall of snow, heaviest during Thu night. Becoming milder with heavy rain (total 42mm) on Thu night. Freeze-thaw conditions (max 3°C on Thu night, min -7°C on Sat morning). Winds decreasing (severe gales from the SW on Thu night, calm by Sun morning).

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. 3 hours ago	1° C	-	Calm (0 kph at 351).
Snoqualmie Pass 30 km ESE 824m alt. 49 minutes ago	-2° C	-	Calm (0 kph at 60).
Black Diamond 32 km SSW 192m alt. 3 hours ago	12° C	Dry	Calm (2 kph at 227).
Renton Airport 36 km WSW 218m alt. 2 hours ago	4° C	Dry and cloudy.	Light winds from the S (13 kph at 190).	16 km Low: broken Mid: broken High: overcast
Grotto wx 39 km NE 1101m alt. 3 hours ago	-5° C	-	Calm (0 kph at 42).
Auburn 39 km SW 119m alt. 57 minutes ago	9° C	Dry	Calm (0 kph at 193).
Stampede Pass Airport 40 km SE 628m alt. 1 hour ago	-6° C	Moderate rain .	Light winds from the N (7 kph at 1).	13 km Low: scattered Mid: broken High: overcast
SHIP8535 42 km WSW 3m alt. 2 hours ago
SHIP8149 42 km WSW 3m alt. 3 hours ago
SHIP6061 42 km WSW 3m alt. 3 hours ago

* 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.