– Lat/Long: 47.51° N 121.74° W

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

Issued: 4 am Wed 13 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 27mm), mostly on Wed morning. Becoming colder with a light covering of snow ,mostly falling on Fri night. Freeze-thaw conditions (max 4°C on Wed afternoon, min -1°C on Fri night). Winds decreasing (strong winds from the WSW on Wed afternoon, moderate winds from the WSW by Thu morning).									Days 4–6 Weather Summary A moderate fall of snow, heaviest on Sat afternoon. Freeze-thaw conditions (max 6°C on Mon afternoon, min -1°C on Sat morning). Winds decreasing (fresh winds from the WSW on Sat morning, calm by Sun morning).
	Wednesday 13			Thursday 14			Friday 15			Saturday 16			Sunday 17			Monday 18
	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night

	heavy rain	mod. rain	rain shwrs	rain shwrs	light rain	rain shwrs	some clouds	light snow	mod. snow	light snow	light snow	mod. snow	some clouds	rain shwrs	rain shwrs	some clouds	rain shwrs	clear
km/h	SW	WSW	WSW	WSW	WSW	WSW	SW	WSW	WSW	WSW	WNW	WSW	WNW	NW	NNW	NW	NW	NNW
See all weather maps
cm	—	—	—	—	—	—	—	1	6	2	4	7	—	—	—	—	—	—
mm	13	10	0.9	0.6	1.4	1.1	—	—	—	—	—	—	—	0.3	0.1	—	0.1	—
max °C	3	4	3	2	4	2	0	1	1	0	1	-1	0	3	3	3	6	5
min °C	2	4	1	1	3	0	0	1	-1	-1	0	-1	-1	2	2	2	6	3
chill °C	-5	-2	-6	-5	-3	-6	-6	-4	-8	-8	-4	-6	-4	0	2	0	4	0

Freezing level m	1750	1900	1450	1600	1700	1450	1300	1350	1300	1250	1350	1100	1250	1600	1600	1700	2100	2150
Cloud base (m)	400	400	750	700	800	500	650	600	400	450	400	450	500	900		1600	1900

	5:31	—	—	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: Heavy rain (total 27mm), mostly on Wed morning. Becoming colder with a light covering of snow ,mostly falling on Fri night. Freeze-thaw conditions (max 4°C on Wed afternoon, min -1°C on Fri night). Winds decreasing (strong winds from the WSW on Wed afternoon, moderate winds from the WSW by Thu morning).

Mount Si Weather (Days 3-6):

A moderate fall of snow, heaviest on Sat afternoon. Freeze-thaw conditions (max 6°C on Mon afternoon, min -1°C on Sat morning). Winds decreasing (fresh winds from the WSW on Sat morning, calm by Sun 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. 56 minutes ago	12° C	Dry	Calm (0 kph at 80).
Renton 30 km WSW 160m alt. 1 hour ago	11° C	Dry	Calm (2 kph at 114).
Black Diamond 32 km SSW 192m alt. 1 hour ago		-	Calm (0 kph at 0).
Grotto wx 35 km NE 321m alt. 1 hour ago	12° C	Dry	Light winds from the WSW (6 kph at 246).
Renton Airport 36 km WSW 218m alt. 3 hours ago	13° C	Light rain .	Light winds from the S (9 kph at 170).	13 km Low: overcast
Grotto wx 39 km NE 1101m alt. 43 minutes ago	8° C	Dry	Wind obs. (6 kph from 142 degs) was rejected.
Auburn 39 km SW 119m alt. 1 hour ago	8° C	Dry	Calm (0 kph at 204).
Stampede Pass Airport 40 km SE 628m alt. 2 hours ago	6° C	Fog -.	Light winds from the N (7 kph at 1).	0 km
Woodinville 43 km WNW 137.2m alt. 58 minutes ago	13° C	Dry	Wind obs. (19 kph from 295 degs) was rejected.
Seattl / oeing Airport 44 km WSW 218m alt. 3 hours ago	12° C	Light rain .	Light winds from the SE (13 kph at 130).	16 km Low: few 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.