– Lat/Long: 47.51° N 121.74° W

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

Issued: 10 am Tue 10 Mar Local Time

Updates in:

hr min s

Update imminent

2 Mount Si Elevations: 2 Forecast Elevations:

	Days 1–3 Weather Summary Light rain (total 7mm) on Wed night. Becoming colder with heavy fall of snow, heaviest during Thu night. Freeze-thaw conditions (max 3°C on Wed night, min -7°C on Tue morning). Winds increasing (light winds from the SW on Tue morning, severe gales from the SW by Wed night).									Days 4–6 Weather Summary A heavy fall of snow, heaviest during Fri morning. Freeze-thaw conditions (max 4°C on Sun night, min -7°C on Sat morning). Winds decreasing (strong winds from the WSW on Fri morning, calm by Sat night).
	Tuesday 10			Wednesday 11			Thursday 12			Friday 13			Saturday 14			Sunday 15
	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night

	light snow	light snow	mod. snow	light snow	light snow	light snow	light snow	mod. snow	heavy snow	heavy snow	light snow	light snow	light snow	snow shwrs	some clouds	cloudy	light snow	rain shwrs
km/h	SW	SW	WSW	SW	SW	WSW	WSW	WSW	SW	W	SW	NNW	NW	NNW	NNE	SSW	WSW	WSW
See all weather maps
cm	1	1	6	5	4	5	2	10	27	13	2	3	4	1	—	—	3	—
mm	—	—	—	—	—	7	—	—	—	—	—	—	—	—	—	—	—	0.3
max °C	-6	-4	-3	-2	1	3	-4	-3	1	0	-3	-4	-7	-5	-2	-1	1	4
min °C	-7	-4	-4	-3	-1	-3	-4	-3	-3	-2	-3	-6	-7	-6	-6	-1	-1	3
chill °C	-14	-11	-13	-9	-10	-13	-13	-11	-9	-9	-8	-13	-13	-10	-11	-4	-7	-2

Freezing level m	550	650	750	900	1550	850	750	700	1450	850	650	400	400	600	0	950	1600	2550
Cloud base (m)	450	700	450	450	400	450	450	450	400	400	400	450	450	550	450	2150	450	1700

	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: Light rain (total 7mm) on Wed night. Becoming colder with heavy fall of snow, heaviest during Thu night. Freeze-thaw conditions (max 3°C on Wed night, min -7°C on Tue morning). Winds increasing (light winds from the SW on Tue morning, severe gales from the SW by Wed night).

Mount Si Weather (Days 3-6):

A heavy fall of snow, heaviest during Fri morning. Freeze-thaw conditions (max 4°C on Sun night, min -7°C on Sat morning). Winds decreasing (strong winds from the WSW on Fri morning, calm by Sat 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. 27 minutes ago	5° C	Dry	Calm (0 kph at 305).
Snoqualmie Pass 30 km ESE 824m alt. 55 minutes ago	3° C	-	Calm (0 kph at 91).
Grotto wx 35 km NE 321m alt. 32 minutes ago	6° C	Dry	Calm (0 kph at 266).
Baring wx 35 km NE 220m alt. 34 minutes ago	6° C	Dry	Calm (2 kph at 108).
Renton Airport 36 km WSW 218m alt. 2 hours ago	10° C	Dry and cloudy.	Moderate winds from the S (22 kph at 180).	16 km Low: scattered Mid: broken High: overcast
Grotto wx 39 km NE 1101m alt. 1 hour ago	-1° C	-	Calm (0 kph at 157).
Auburn 39 km SW 119m alt. 1 hour ago		-	Calm (3 kph at 30).
Stampede Pass Airport 40 km SE 628m alt. 2 hours ago	-2° C	Moderate rain .	Light winds from the N (6 kph at 1).	16 km Low: few Mid: broken High: broken
SHIP6926 42 km WSW 3m alt. 1 hour ago
SHIP1842 42 km WSW 15m alt. 1 hour 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.