– Lat/Long: 47.51° N 121.74° W

Mount Si Weather Forecast

Cascade Range · United States

Issued: 10 pm Sun 13 Sep Local Time

Updates in:

hr min s

Update imminent

Issued: 10 pm Sun 13 Sep Local Time

Updates in:

hr min s

Update imminent

2 Mount Si Elevations: 2 Forecast Elevations:

	Days 1–4 Weather Summary Light rain (total 4mm), mostly falling on Sun night. Very mild (max 15°C on Wed afternoon, min 5°C on Mon morning). Winds decreasing (fresh winds from the WSW on Sun night, calm by Mon night).										Days 5–7 Weather Summary Mostly dry. Very mild (max 16°C on Thu morning, min 9°C on Fri morning). Wind will be generally light.
		Monday 14			Tuesday 15			Wednesday 16			Thursday 17			Friday 18
	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night

	light rain	rain shwrs	rain shwrs	some clouds	light rain	light rain	clear	clear	clear	clear	clear	clear	clear	clear	clear	some clouds
Cloud base (m)	600	700	950	5700	950	1500	2550			6950
km/h	SW	SW	NW	NNW	NE	NE	ENE	E	NE	ENE	S	W	WSW	WSW	WNW	N
See all weather maps
cm	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—
mm	3	0.5	0.1	—	0.3	0.2	—	—	—	—	—	—	—	—	—	—
max °C	7	6	8	8	7	8	9	12	15	15	16	16	14	10	11	11
min °C	6	5	7	7	7	7	8	10	14	14	15	15	10	9	11	11
chill °C	1	3	7	7	7	7	7	10	14	14	15	15	8	8	11	11

Freezing level m	2750	3400	3350	3200	2500	2600	2900	3550	3700	3800	3750	3700	3800	3850	3850	3900

	—	6:41	—	—	6:43	—	—	6:45	—	—	6:46	—	—	6:47	—	—
	—	—	7:21	—	—	7:19	—	—	7:16	—	—	7:15	—	—	7:13	—

Mount Si Weather (Days 0-3):

The weather forecast for Mount Si is: Light rain (total 4mm), mostly falling on Sun night. Very mild (max 15°C on Wed afternoon, min 5°C on Mon morning). Winds decreasing (fresh winds from the WSW on Sun night, calm by Mon night).

Mount Si Weather (Days 3-6):

Mostly dry. Very mild (max 16°C on Thu morning, min 9°C on Fri morning). 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
Renton 30 km WSW 160m alt. 1 hour ago	13°C	Dry	Calm (0 kph at 179).
Black Diamond 32 km SSW 192m alt. 1 hour ago	28°C	Dry	Calm (0 kph at 0).
Renton Airport 36 km WSW 716m alt. 2 hours ago	16°C	Dry and partly cloudy.	Light winds from the S (11 kph at 170).	16 km Low: few Mid: scattered
Auburn 39 km SW 119m alt. 1 hour ago	21°C	Dry	Calm (0 kph at 184).
Stampede Pass Airport 40 km SE 628m alt. 48 minutes ago	6°C	Dry and cloudy.	Light winds from the N (7 kph at 1).	16 km Low: scattered Mid: broken High: overcast
Monroe 44 km NW 80m alt. 1 hour ago	22°C	Dry	Calm (0 kph at 74).
Seattle Tacoma International Airport 44 km WSW 716m alt. 2 hours ago	14°C	Dry and partly cloudy.	Light winds from the S (17 kph at 190).	16 km Low: scattered Mid: broken
Seattl / oeing Airport 44 km WSW 716m alt. 2 hours ago	15°C	Dry and partly cloudy.	Light winds from the SSE (13 kph at 160).	16 km Low: few Mid: broken
BUOY-EBSW1 46 km W 3m alt. 2 hours ago
Snohomish 49 km NW 196m alt. 52 minutes ago	13°C	Dry	Calm (2 kph at 163).

* 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.