– Lat/Long: 47.51° N 121.74° W

Mount Si
Weather Forecast, United States
Issued: 10 pm Mon 11 May Local Time
Updates in:
hr min s
Update imminent

Issued: 10 pm Mon 11 May 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. Milder later with heavy rain (total 30mm) on Wed afternoon. Very mild (max 18°C on Tue afternoon, min 1°C on Thu morning). Winds increasing (calm on Mon night, near gales from the WSW by Wed afternoon).										Days 5–7 Weather Summary A moderate fall of snow, heaviest on Thu night. Becoming mild with drizzle, on Sat afternoon. Freeze-thaw conditions (max 4°C on Sun afternoon, min -1°C on Fri morning). Winds decreasing (strong winds from the SW on Thu night, light winds from the NNW by Sun morning).
		Tuesday 12			Wednesday 13			Thursday 14			Friday 15			Saturday 16			Sunday 17
	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night

	clear	some clouds	some clouds	rain shwrs	light snow	heavy rain	rain shwrs	cloudy	light rain	mod. snow	cloudy	light snow	light snow	cloudy	rain shwrs	light snow	some clouds	light rain	cloudy
km/h	ESE	ESE	W	SW	WSW	WSW	WSW	WSW	SW	SW	SW	WSW	WSW	SW	W	N	NNW	NW	NW
See all weather maps
cm	—	—	—	—	2	—	—	—	—	7	—	2	4	—	—	3	—	—	—
mm	—	—	—	8	6	13	1.5	—	3	—	—	—	—	—	1.5	—	—	0.1	—
max °C	14	16	18	12	2	3	3	2	3	2	0	0	0	0	2	1	1	4	4
min °C	13	15	15	4	2	3	2	1	2	0	-1	0	-1	-1	1	-1	0	3	2
chill °C	13	14	14	0	-4	-4	-5	-5	-4	-7	-8	-7	-7	-6	-2	-4	-3	1	-2

Freezing level m	3750	3800	3650	3000	1700	1800	1650	1500	1650	1250	1250	1250	1100	1250	1550	1250	1350	1950	1650
Cloud base (m)	9450	6200	6450	800	450	450	450	600	550	550	600	500	450	500	850	550	550	1550	950

	—	5:33	—	—	5:31	—	—	5:31	—	—	5:30	—	—	5:28	—	—	5:26	—	—
	—	—	—	8:32	—	—	8:34	—	—	8:35	—	—	8:37	—	—	8:37	—	—	8:38

Mount Si Weather (Days 0-3):

The weather forecast for Mount Si is: A dusting of snow. Milder later with heavy rain (total 30mm) on Wed afternoon. Very mild (max 18°C on Tue afternoon, min 1°C on Thu morning). Winds increasing (calm on Mon night, near gales from the WSW by Wed afternoon).

Mount Si Weather (Days 3-6):

A moderate fall of snow, heaviest on Thu night. Becoming mild with drizzle, on Sat afternoon. Freeze-thaw conditions (max 4°C on Sun afternoon, min -1°C on Fri morning). Winds decreasing (strong winds from the SW on Thu night, light winds from the NNW 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. 2 hours ago	10° C	Dry	Calm (0 kph at 236).
Renton 30 km WSW 160m alt. 46 minutes ago	12° C	Dry	Calm (0 kph at 19).
Black Diamond 32 km SSW 192m alt. 2 hours ago		-	Calm (0 kph at 0).
Grotto wx 35 km NE 321m alt. 1 hour ago	12° C	Dry	Calm (5 kph at 48).
Renton Airport 36 km WSW 218m alt. 2 hours ago	14° C	Clear	Light winds from the NNW (11 kph at 340).	16 km
Grotto wx 39 km NE 1101m alt. 1 hour ago	8° C	Dry	Calm (2 kph at 335).
Auburn 39 km SW 119m alt. 1 hour ago	11° C	Dry	Calm (0 kph at 130).
Stampede Pass Airport 40 km SE 628m alt. 2 hours ago	9° C	Clear	Calm (0 kph at 0).	16 km
Woodinville 43 km WNW 137.2m alt. 2 hours ago	6° C	Dry	Calm (0 kph at 271).
Seattl / oeing Airport 44 km WSW 218m alt. 2 hours ago	14° C	Clear	Calm (0 kph at 0).	16 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.