– Lat/Long: 47.51° N 121.74° W

Mount Si Weather Forecast

Cascade Range · United States

Issued: 10 am Mon 28 Sep Local Time

Updates in:

hr min s

Update imminent

Issued: 10 am Mon 28 Sep Local Time

Updates in:

hr min s

Update imminent

2 Mount Si Elevations: 2 Forecast Elevations:

	Days 1–3 Weather Summary Heavy rain (total 20mm), heaviest during Tue afternoon. Very mild (max 15°C on Mon afternoon, min 8°C on Wed morning). Wind will be generally light.									Days 4–6 Weather Summary Heavy rain (total 28mm), heaviest during Thu night. Warm (max 20°C on Sat afternoon, min 9°C on Thu morning). Wind will be generally light.
	Monday 28			Tuesday 29			Wednesday 30			Thursday 1			Friday 2			Saturday 3
	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night

	some clouds	some clouds	rain shwrs	light rain	mod. rain	rain shwrs	clear	clear	some clouds	light rain	mod. rain	heavy rain	light rain	light rain	clear	clear	clear	clear
Cloud base (m)		2850	1650	400	400	400	9100		3000	2000	450	400	450	450	8650
km/h	W	SW	SW	WSW	WSW	NW	NNW	NNW	NW	ESE	SSE	SSW	W	WSW	E	ESE	ENE	E
See all weather maps
cm	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—
mm	—	—	0.7	5	9	6	—	—	—	1.1	8	13	5	0.5	—	—	—	—
max °C	14	15	12	12	13	12	11	14	12	11	10	12	12	13	12	17	20	14
min °C	10	15	12	12	13	9	8	13	10	9	10	11	12	12	11	11	19	13
chill °C	10	15	11	10	11	9	8	13	10	9	10	10	11	12	11	10	19	13

Freezing level m	2850	2750	3450	3200	2950	2850	3100	3150	3150	3150	3200	3050	2750	3450	3900	4050	4150	4100

	7:01	—	—	7:01	—	—	7:03	—	—	7:05	—	—	7:05	—	—	7:07	—	—
	—	6:52	—	—	6:51	—	—	6:49	—	—	6:46	—	—	6:45	—	—	6:43	—

Mount Si Weather (Days 0-3):

The weather forecast for Mount Si is: Heavy rain (total 20mm), heaviest during Tue afternoon. Very mild (max 15°C on Mon afternoon, min 8°C on Wed morning). Wind will be generally light.

Mount Si Weather (Days 3-6):

Heavy rain (total 28mm), heaviest during Thu night. Warm (max 20°C on Sat afternoon, min 9°C on Thu morning). 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
Black Diamond 32 km SSW 192m alt. 2 hours ago		-	Calm (5 kph at 0).
Renton Airport 36 km WSW 218m alt. 2 hours ago	18°C	Clear	Light winds from the SSW (7 kph at 200).	16 km
Auburn 39 km SW 119m alt. 55 minutes ago	26°C	Dry	Calm (0 kph at 266).
Monroe 44 km NW 80m alt. 2 hours ago	14°C	Dry	Calm (0 kph at 81).
Seattl / oeing Airport 44 km WSW 218m alt. 2 hours ago	17°C	Dry and partly cloudy.	Light winds from the S (9 kph at 190).	16 km Low: broken
Seattle Tacoma International Airport 44 km WSW 218m alt. 2 hours ago	17°C	Dry and partly cloudy.	Light winds from the SSW (11 kph at 200).	16 km Low: broken
BUOY-EBSW1 46 km W 3m alt. 1 hour ago
Snohomish 49 km NW 196m alt. 3 hours ago	17°C	Dry	Wind obs. (6 kph from 180 degs) was rejected.
Seattle 49 km WSW 100m alt. 49 minutes ago		-	Light winds from the WSW (11 kph at 240).
BUOY-WPOW1 55 km W 3m alt. 1 hour ago	15°C		Light winds from the SSE (17 kph at 160).

* 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.