– Lat/Long: 47.51° N 121.74° W

Mount Si
Weather Forecast, United States
Issued: 10 am Mon 20 May Local Time
Updates in:
hr min s
Update imminent

Issued: 10 am Mon 20 May Local Time

Updates in:

hr min s

Update imminent

2 Mount Si Elevations: 2 Forecast Elevations:

	Days 1–3 Weather Summary Heavy rain (total 45mm), mostly on Tue afternoon. Becoming colder with a light covering of snow ,mostly falling on Tue night. Freeze-thaw conditions (max 5°C on Mon night, min -1°C on Tue night). Winds increasing (light winds from the W on Mon night, strong winds from the SW by Tue afternoon).									Days 4–6 Weather Summary Mild with light rain (total 5mm) on Fri morning Becoming colder with a light covering of snow, mostly falling on Sat morning. Freeze-thaw conditions (max 5°C on Thu afternoon, min -2°C on Fri night). Winds increasing (light winds from the W on Thu morning, fresh winds from the SW by Fri afternoon).
	Monday 20			Tuesday 21			Wednesday 22			Thursday 23			Friday 24			Saturday 25
	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night

	light rain	rain shwrs	rain shwrs	light rain	heavy rain	light snow	light snow	cloudy	light rain	some clouds	rain shwrs	light rain	light rain	rain shwrs	snow shwrs	light snow	snow shwrs	rain shwrs
km/h	NNW	NW	W	SW	SW	SW	WNW	NW	WSW	W	W	SW	SW	SW	SW	WNW	WNW	SW
Wave Height Map See all maps
cm	—	—	—	—	—	3	3	—	—	—	—	—	—	—	2.0	3	1.0	—
mm	0.2	0.3	0.1	4	26	13	—	—	0.4	—	0.2	0.1	3	2	—	—	—	0.1
max°C	2	4	5	4	4	4	-1	2	2	3	5	5	3	3	1	-1	2	2
min°C	2	4	3	3	4	-1	-1	0	2	2	4	3	2	2	-2	-2	0	1
chill°C	-1	2	0	-2	-2	-9	-8	-3	-1	0	3	-1	-3	-4	-9	-7	-4	-3

Freezing level (m)	1600	1900	1900	2100	2100	1550	1150	1600	1800	1850	2200	2200	1950	1600	1050	1100	1550	1650
Cloud base (m)	750	850	950	500	400	400	500	400	750	650	900	800	650	400	700	400	500	700

	5:22	—	—	5:22	—	—	5:20	—	—	5:20	—	—	5:18	—	—	5:18	—	—
	—	—	8:44	—	—	8:45	—	—	8:45	—	—	8:46	—	—	8:49	—	—	8:50

Mount Si Weather (Days 0-3):

The weather forecast for Mount Si is: Heavy rain (total 45mm), mostly on Tue afternoon. Becoming colder with a light covering of snow ,mostly falling on Tue night. Freeze-thaw conditions (max 5°C on Mon night, min -1°C on Tue night). Winds increasing (light winds from the W on Mon night, strong winds from the SW by Tue afternoon).

Mount Si Weather (Days 3-6):

Mild with light rain (total 5mm) on Fri morning Becoming colder with a light covering of snow, mostly falling on Sat morning. Freeze-thaw conditions (max 5°C on Thu afternoon, min -2°C on Fri night). Winds increasing (light winds from the W on Thu morning, fresh winds from the SW by Fri 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 5 closest weather stations

Weather Station	Temp.	Weather	Wind	Cloud Visibility Cloud / Visibility
Snoqualmie Pass 30 km ESE 824m alt. 41 minutes ago	12° C	-	Calm (0 kph at 178).
Renton Airport 36 km WSW 218m alt. 2 hours ago	12° C	Clear	Light winds from the N (6 kph at 1).	11 km
Auburn 39 km SW 119m alt. 1 hour ago		-	Calm (0 kph at 269).
Grotto wx 39 km NE 1101m alt. 1 hour ago	6° C	Dry	Calm (2 kph at 228).
Stampede Pass Airport 40 km SE 628m alt. 2 hours ago	4° C	Dry and cloudy.	Light winds from the N (7 kph at 1).	16 km Low: scattered Mid: overcast

* 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.