– Lat/Long: 47.51° N 121.74° W

Mount Si
Weather Forecast, United States
Issued: 4 am Sat 21 Mar Local Time
Updates in:
hr min s
Update imminent

Issued: 4 am Sat 21 Mar Local Time

Updates in:

hr min s

Update imminent

2 Mount Si Elevations: 2 Forecast Elevations:

	Days 1–3 Weather Summary Mostly dry. Freeze-thaw conditions (max 4°C on Mon night, min -3°C on Sat morning). Wind will be generally light.									Days 4–6 Weather Summary A moderate fall of snow, heaviest on Tue morning. Turning milder with moderate rain (total 16mm), heaviest on Tue afternoon. Freeze-thaw conditions (max 3°C on Tue afternoon, min -5°C on Tue night). Winds decreasing (gales from the SW on Tue night, calm by Thu night).
	Saturday 21			Sunday 22			Monday 23			Tuesday 24			Wednesday 25			Thursday 26
	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night

	some clouds	some clouds	some clouds	some clouds	clear	cloudy	clear	some clouds	cloudy	light snow	rain shwrs	snow shwrs	light snow	light snow	snow shwrs	cloudy	some clouds	clear
km/h	WSW	WSW	SW	SW	W	NW	SW	SSW	SSW	S	SW	SW	WSW	WSW	SW	SW	SW	E
See all weather maps
cm	—	—	—	—	—	—	—	—	—	2	—	4	2	3	2	—	—	—
mm	—	—	—	—	—	—	—	—	—	6	9	—	—	—	—	—	—	—
max °C	-3	-2	-2	-3	0	2	3	3	4	2	3	0	-5	-3	-4	-4	-1	1
min °C	-3	-3	-3	-3	-1	1	2	3	1	0	2	-5	-5	-4	-5	-4	-2	-2
chill °C	-6	-6	-8	-7	-3	1	2	3	-5	-5	-6	-16	-14	-12	-11	-10	-6	-2

Freezing level m	800	1000	550	950	1250	1900	1900	1950	1900	2000	1650	800	700	900	550	800	1150	850
Cloud base (m)	450	550	500	600	600	600	500	6100	2650	450	400	500	450	650	650	650	700	550

	7:07	—	—	7:05	—	—	7:03	—	—	7:01	—	—	7:00	—	—	6:58	—	—
	—	7:20	—	—	7:22	—	—	7:22	—	—	7:23	—	—	7:25	—	—	7:27	—

Mount Si Weather (Days 0-3):

The weather forecast for Mount Si is: Mostly dry. Freeze-thaw conditions (max 4°C on Mon night, min -3°C on Sat morning). Wind will be generally light.

Mount Si Weather (Days 3-6):

A moderate fall of snow, heaviest on Tue morning. Turning milder with moderate rain (total 16mm), heaviest on Tue afternoon. Freeze-thaw conditions (max 3°C on Tue afternoon, min -5°C on Tue night). Winds decreasing (gales from the SW on Tue night, calm by Thu 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 10 closest weather stations

Weather Station	Temp.	Weather	Wind	Cloud Visibility Cloud / Visibility
Harman Heights wx 6 km SSW 251m alt. 1 hour ago	8° C	Dry	Calm (0 kph at 332).
Snoqualmie Pass 30 km ESE 824m alt. 39 minutes ago	4° C	-	Calm (0 kph at 345).
Black Diamond 32 km SSW 192m alt. 1 hour ago		-	Calm (3 kph at 109).
Grotto wx 35 km NE 321m alt. 1 hour ago	5° C	Dry	Light winds from the WSW (8 kph at 250).
Renton Airport 36 km WSW 218m alt. 2 hours ago	7° C	Dry and cloudy.	Light winds from the N (13 kph at 10).	16 km Low: few Mid: broken High: overcast
Grotto wx 39 km NE 1101m alt. 2 hours ago	0° C	-	Calm (0 kph at 76).
Auburn 39 km SW 119m alt. 2 hours ago		-	Calm (0 kph at 96).
Stampede Pass Airport 40 km SE 628m alt. 1 hour ago	-1° C	Moderate rain .	Light winds from the N (7 kph at 1).	14 km Low: few Mid: few High: broken
SHIP3143 43 km W 15m alt. 3 hours ago				- km
SHIP8501 43 km W 15m alt. 2 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.