– Lat/Long: 47.51° N 121.74° W

Mount Si
Weather Forecast, United States
Issued: 4 pm Wed 13 May Local Time
Updates in:
hr min s
Update imminent

Issued: 4 pm Wed 13 May Local Time

Updates in:

hr min s

Update imminent

2 Mount Si Elevations: 2 Forecast Elevations:

	Days 1–4 Weather Summary Moderate rain (total 14mm), heaviest on Wed afternoon giving way to a moderate fall of snow, heaviest on Thu night. Freeze-thaw conditions (max 5°C on Wed afternoon, min -1°C on Fri morning). Winds decreasing (near gales from the WSW on Wed afternoon, moderate winds from the WSW by Thu morning).											Days 5–7 Weather Summary A dusting of snow turning to light rain (total 6mm) on Tue morning. Freeze-thaw conditions (max 4°C on Mon afternoon, min -1°C on Sat night). Winds increasing (calm on Sun morning, fresh winds from the WSW by Tue morning).
	Wed 13		Thursday 14			Friday 15			Saturday 16			Sunday 17			Monday 18
	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night

	heavy rain	light rain	rain shwrs	light rain	light snow	some clouds	light snow	snow shwrs	light snow	light snow	snow shwrs	cloudy	rain shwrs	cloudy	rain shwrs	light rain	rain shwrs
km/h	WSW	WSW	WSW	WSW	WSW	SW	WSW	WSW	WSW	NNW	NNW	WNW	WSW	WNW	WNW	W	WSW
See all weather maps
cm	—	—	—	—	5	—	1	5	2	3	1	—	—	—	—	—	—
mm	12	1.1	0.6	1.2	—	—	—	—	—	—	—	—	0.2	—	0.1	0.2	1
max °C	5	4	2	4	1	0	1	0	-1	1	0	0	3	3	3	4	4
min °C	4	1	2	3	1	-1	0	-1	-1	0	-1	-1	2	2	2	4	3
chill °C	-2	-5	-4	-2	-5	-8	-7	-8	-8	-4	-6	-3	0	0	1	3	-2

Freezing level m	2000	1600	1650	1650	1400	1250	1350	1250	1200	1350	1150	1300	1700	1650	1700	1950	1950
Cloud base (m)	400	500	650	800	450	650	450	400	450	600	700	500	900	1650	1600	1600	450

	—	—	5:31	—	—	5:30	—	—	5:28	—	—	5:26	—	—	5:26	—	—
	—	8:34	—	—	8:35	—	—	8:37	—	—	8:37	—	—	8:38	—	—	8:39

Mount Si Weather (Days 0-3):

The weather forecast for Mount Si is: Moderate rain (total 14mm), heaviest on Wed afternoon giving way to a moderate fall of snow, heaviest on Thu night. Freeze-thaw conditions (max 5°C on Wed afternoon, min -1°C on Fri morning). Winds decreasing (near gales from the WSW on Wed afternoon, moderate winds from the WSW by Thu morning).

Mount Si Weather (Days 3-6):

A dusting of snow turning to light rain (total 6mm) on Tue morning. Freeze-thaw conditions (max 4°C on Mon afternoon, min -1°C on Sat night). Winds increasing (calm on Sun morning, fresh winds from the WSW by Tue morning).

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. 2 hours ago	11° C	Dry	Calm (0 kph at 355).
Snoqualmie Pass 30 km ESE 824m alt. 47 minutes ago	7° C	-	Calm (0 kph at 214).
Renton 30 km WSW 160m alt. 2 hours ago	13° C	Dry	Light winds from the SSW (13 kph at 205).
Black Diamond 32 km SSW 192m alt. 40 minutes ago		-	Wind obs. (16 kph from 360 degs) was rejected.
Grotto wx 35 km NE 321m alt. 1 hour ago	11° C	Light rain.	Light winds from the WNW (6 kph at 299).
Renton Airport 36 km WSW 218m alt. 2 hours ago	15° C	Dry and cloudy.	Moderate winds from the SSW (24 kph at 200).	16 km Low: scattered Mid: overcast
Grotto wx 39 km NE 1101m alt. 1 hour ago	6° C	Dry	Calm (2 kph at 136).
Auburn 39 km SW 119m alt. 1 hour ago		-	Calm (0 kph at 67).
Stampede Pass Airport 40 km SE 628m alt. 1 hour ago	3° C	Light rain .	Light winds from the N (11 kph at 1).	0 km Mid: overcast
Woodinville 43 km WNW 137.2m alt. 1 hour ago	11° C	Dry	Wind obs. (10 kph from 325 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.