– Lat/Long: 47.51° N 121.74° W

Mount Si Weather Forecast

Cascade Range · United States

Issued: 4 am Sun 04 Oct Local Time

Updates in:

hr min s

Update imminent

Issued: 4 am Sun 04 Oct Local Time

Updates in:

hr min s

Update imminent

2 Mount Si Elevations: 2 Forecast Elevations:

	Days 1–3 Weather Summary Mostly dry. Warm (max 22°C on Sun afternoon, min 12°C on Mon night). Wind will be generally light.									Days 4–6 Weather Summary Moderate rain (total 12mm), heaviest on Fri night. Warm (max 21°C on Thu afternoon, min 7°C on Fri night). Wind will be generally light.
	Sunday 4			Monday 5			Tuesday 6			Wednesday 7			Thursday 8			Friday 9
	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night

	clear	clear	clear	some clouds	some clouds	clear	clear	clear	clear	clear	clear	clear	clear	clear	clear	clear	rain shwrs	mod. rain
Cloud base (m)	9600				900		9300	9200	9350						8650		1700	400
km/h	WSW	W	SE	NW	NW	NNE	NNW	NNW	NE	NNW	NNW	NE	NNW	NW	SSE	SW	SW	SW
See all weather maps
cm	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—
mm	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	4	9
max °C	21	22	17	17	18	14	16	18	13	17	19	15	19	21	16	15	16	12
min °C	15	22	14	13	17	12	12	17	12	13	19	14	14	20	14	12	12	7
chill °C	15	22	14	13	17	12	12	17	12	13	19	14	14	20	14	11	10	5

Freezing level m	4100	4200	4050	3900	3950	4200	4150	4200	4150	4150	4150	4100	4150	4100	4000	3500	3150	1850

	7:09	—	—	7:09	—	—	7:11	—	—	7:13	—	—	7:15	—	—	7:16	—	—
	—	6:40	—	—	6:38	—	—	6:37	—	—	6:35	—	—	6:32	—	—	6:30	—

Mount Si Weather (Days 0-3):

The weather forecast for Mount Si is: Mostly dry. Warm (max 22°C on Sun afternoon, min 12°C on Mon night). Wind will be generally light.

Mount Si Weather (Days 3-6):

Moderate rain (total 12mm), heaviest on Fri night. Warm (max 21°C on Thu afternoon, min 7°C on Fri night). Wind will be generally light.

This table gives the weather forecast for Mount Si at the specific elevation of 500 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
Snoqualmie 10 km W 237m alt. 1 hour ago	10°C	Dry	Calm (0 kph at 179).
Maple Valley 22 km SW 233m alt. 29 minutes ago	11°C	Dry	Calm (0 kph at 329).
Sammamish 24 km W 138m alt. 1 hour ago	12°C	Dry	Wind obs. (6 kph from 349 degs) was rejected.
Redmond 31 km WNW 170m alt. 1 hour ago	12°C	Dry	Calm (0 kph at 216).
Black Diamond 32 km SSW 192m alt. 1 hour ago		-	Wind obs. (18 kph from 360 degs) was rejected.
Bellevue 32 km W 128m alt. 53 minutes ago	12°C	-	Calm (2 kph at 46).
Benson Hill wx 35 km SW 144m alt. 1 hour ago	13°C	Dry	Calm (0 kph at 346).
Renton Airport 36 km WSW 218m alt. 2 hours ago	12°C	Dry and cloudy.	Calm (0 kph at 0).	0.0 km High: overcast
Auburn 39 km SW 119m alt. 1 hour ago	23°C	Dry	Calm (0 kph at 273).
Stampede Pass Airport 40 km SE 628m alt. 2 hours ago	9°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.