– Lat/Long: 47.51° N 121.74° W

Mount Si
Weather Forecast, United States
Issued: 10 pm Thu 14 May Local Time
Updates in:
hr min s
Update imminent

Issued: 10 pm Thu 14 May Local Time

Updates in:

hr min s

Update imminent

2 Mount Si Elevations: 2 Forecast Elevations:

	Days 1–4 Weather Summary A heavy fall of snow, heaviest during Sat morning. Freeze-thaw conditions (max 3°C on Sun afternoon, min -1°C on Fri morning). Winds decreasing (strong winds from the SW on Thu night, calm by Sun afternoon).										Days 5–7 Weather Summary Light rain (total 9mm), mostly falling on Tue morning. Mild temperatures (max 9°C on Wed afternoon, min 2°C on Sun night). Wind will be generally light.
		Friday 15			Saturday 16			Sunday 17			Monday 18			Tuesday 19			Wednesday 20
	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night

	snow shwrs	light snow	light snow	light snow	mod. snow	snow shwrs	some clouds	some clouds	some clouds	cloudy	some clouds	light rain	light rain	rain shwrs	rain shwrs	rain shwrs	some clouds	some clouds	rain shwrs
km/h	SW	SW	SW	WSW	NW	NNW	N	N	WNW	NW	NW	WNW	WSW	WNW	NW	NNW	NNW	NW	SW
See all weather maps
cm	2	1	5	4	6	2	—	—	—	—	—	—	—	—	—	—	—	—	—
mm	—	—	—	—	—	—	—	—	—	—	—	0.1	2	4	1.8	0.3	—	—	0.2
max °C	2	0	0	0	-1	1	0	0	3	3	3	7	5	4	6	6	6	9	9
min °C	0	-1	0	-1	-1	0	-1	-1	2	2	2	6	3	3	5	4	5	7	6
chill °C	-7	-8	-7	-8	-6	-3	-6	-5	2	0	0	4	0	0	3	2	3	5	2

Freezing level m	1300	1200	1300	1250	1150	1400	1150	1250	1750	1850	1750	2200	1850	1900	2200	2450	2800	2800	2500
Cloud base (m)	550	550	400	400	450	600	800	550	850	5750	1600	2200	550	450	950	900	650	2050	1650

	—	5:30	—	—	5:28	—	—	5:26	—	—	5:26	—	—	5:24	—	—	5:24	—	—
	—	—	—	8:37	—	—	8:37	—	—	8:38	—	—	8:39	—	—	8:42	—	—	8:43

Mount Si Weather (Days 0-3):

The weather forecast for Mount Si is: A heavy fall of snow, heaviest during Sat morning. Freeze-thaw conditions (max 3°C on Sun afternoon, min -1°C on Fri morning). Winds decreasing (strong winds from the SW on Thu night, calm by Sun afternoon).

Mount Si Weather (Days 3-6):

Light rain (total 9mm), mostly falling on Tue morning. Mild temperatures (max 9°C on Wed afternoon, min 2°C on Sun night). Wind will be generally light.

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. 28 minutes ago	8° C	Dry	Calm (0 kph at 18).
Snoqualmie Pass 30 km ESE 824m alt. 31 minutes ago	5° C	-	Calm (0 kph at 174).
Renton 30 km WSW 160m alt. 48 minutes ago	8° C	Dry	Calm (3 kph at 243).
Black Diamond 32 km SSW 192m alt. 1 hour ago		-	Calm (2 kph at 0).
Grotto wx 35 km NE 321m alt. 3 hours ago	8° C	Dry	Calm (0 kph at 142).
Renton Airport 36 km WSW 218m alt. 1 hour ago	10° C	Dry and partly cloudy.	Light winds from the S (13 kph at 180).	16 km Low: broken
Grotto wx 39 km NE 1101m alt. 1 hour ago	2° C	-	Wind obs. (8 kph from 84 degs) was rejected.
Auburn 39 km SW 119m alt. 45 minutes ago	17° C	Dry	Calm (0 kph at 147).
Stampede Pass Airport 40 km SE 628m alt. 2 hours ago	1° C	Light rain .	Light winds from the W.(Wind varies from 240 to 320 degs) (19 kph at 280).	8 km Mid: overcast
Woodinville 43 km WNW 137.2m alt. 2 hours ago	7° C	Dry	Wind obs. (8 kph from 324 degs) was rejected.

* 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.