– Lat/Long: 47.51° N 121.74° W

Mount Si
Weather Forecast, United States
Issued: 10 pm Sat 21 Mar Local Time
Updates in:
hr min s
Update imminent

Issued: 10 pm Sat 21 Mar Local Time

Updates in:

hr min s

Update imminent

2 Mount Si Elevations: 2 Forecast Elevations:

	Days 1–4 Weather Summary A dusting of snow giving way to moderate rain (total 18mm) heaviest on Tue afternoon. Freeze-thaw conditions (max 4°C on Mon night, min -3°C on Sat night). Winds increasing (calm on Sun night, strong winds from the SW by Tue afternoon).										Days 5–7 Weather Summary Mild at first with light rain (total 3mm) on Tue night followed by colder weather and light fall of snow, heaviest on Tue night. Freeze-thaw conditions (max 6°C on Fri afternoon, min -5°C on Tue night). Winds decreasing (near gales from the SW on Tue night, calm by Thu afternoon).
		Sunday 22			Monday 23			Tuesday 24			Wednesday 25			Thursday 26			Friday 27
	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night

	some clouds	clear	some clouds	some clouds	clear	some clouds	cloudy	light snow	heavy rain	mod. snow	light snow	light snow	light snow	snow shwrs	some clouds	clear	some clouds	some clouds	some clouds
km/h	SW	SW	WSW	WSW	SW	SW	SW	SSW	SW	WSW	WSW	WSW	WSW	SW	NNW	E	ESE	ESE	ESE
See all weather maps
cm	—	—	—	—	—	—	—	1	—	7	3	4	3	2	—	—	—	—	—
mm	—	—	—	—	—	—	—	0.4	17	3	—	—	—	—	—	—	—	—	—
max °C	-2	-2	1	2	3	3	4	2	3	2	-4	-3	-4	-4	-2	0	4	6	7
min °C	-3	-3	0	1	2	3	1	1	3	-5	-5	-4	-5	-5	-3	-2	2	5	6
chill °C	-7	-7	-2	1	2	3	-5	-5	-3	-15	-14	-12	-13	-12	-6	-4	-2	2	2

Freezing level m	650	1100	1350	1900	1950	1800	1700	1800	1900	650	700	850	600	750	1100	0	2200	2850	3150
Cloud base (m)	850	650	850	650	550	800	3000	1700	400	450	450	450	450	500	700	450	6550	6200	5300

	—	7:05	—	—	7:03	—	—	7:01	—	—	7:00	—	—	6:58	—	—	6:56	—	—
	—	—	7:22	—	—	7:22	—	—	7:23	—	—	7:25	—	—	7:27	—	—	7:29	—

Mount Si Weather (Days 0-3):

The weather forecast for Mount Si is: A dusting of snow giving way to moderate rain (total 18mm) heaviest on Tue afternoon. Freeze-thaw conditions (max 4°C on Mon night, min -3°C on Sat night). Winds increasing (calm on Sun night, strong winds from the SW by Tue afternoon).

Mount Si Weather (Days 3-6):

Mild at first with light rain (total 3mm) on Tue night followed by colder weather and light fall of snow, heaviest on Tue night. Freeze-thaw conditions (max 6°C on Fri afternoon, min -5°C on Tue night). Winds decreasing (near gales from the SW on Tue night, calm by Thu afternoon).

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. 47 minutes ago	3° C	Dry	Calm (0 kph at 353).
Renton Airport 36 km WSW 218m alt. 2 hours ago	8° C	Clear	Light winds from the SSW (11 kph at 200).	16 km
Auburn 39 km SW 119m alt. 32 minutes ago	9° C	Dry	Calm (0 kph at 205).
Stampede Pass Airport 40 km SE 628m alt. 2 hours ago	-2° C	Dry and partly cloudy.	Light winds from the N (7 kph at 1).	16 km Low: few Mid: broken
Seattl / oeing Airport 44 km WSW 218m alt. 2 hours ago	8° C	Clear	Light winds from the N (9 kph at 1).	16 km
Seattle Tacoma International Airport 44 km WSW 218m alt. 2 hours ago	7° C	Clear	Light winds from the WSW (11 kph at 250).	16 km
Snohomish 49 km NW 196m alt. 31 minutes ago	7° C	Dry	Calm (2 kph at 131).
SHIP8156 54 km SSW 15m alt. 3 hours ago				- km
SHIP4662 54 km SSW 3m alt. 1 hour ago
SHIP6820 54 km SSW 15m alt. 3 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.