– Lat/Long: 47.51° N 121.74° W

Mount Si Weather Forecast

Cascade Range · United States

Issued: 10 am Sat 12 Sep Local Time

Updates in:

hr min s

Update imminent

Issued: 10 am Sat 12 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 35mm), heaviest during Sat night. Very mild (max 18°C on Sat morning, min 9°C on Sat night). Wind will be generally light.									Days 4–6 Weather Summary Mostly dry. Warm (max 26°C on Thu afternoon, min 10°C on Tue morning). Wind will be generally light.
	Saturday 12			Sunday 13			Monday 14			Tuesday 15			Wednesday 16			Thursday 17
	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night

	cloudy	cloudy	heavy rain	heavy rain	mod. rain	rain shwrs	light rain	cloudy	clear	clear	clear	clear	clear	clear	clear	clear	clear	clear
Cloud base (m)	4650		400	400	400	650	650	900	5500	6100
km/h	ESE	WNW	W	WSW	SW	SW	WSW	NW	ENE	NW	NW	ESE	NW	NNW	ESE	ESE	NW	ESE
See all weather maps
cm	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—
mm	—	—	14	13	7	1.8	0.3	—	—	—	—	—	—	—	—	—	—	—
max °C	18	18	15	9	11	11	11	14	12	14	17	13	19	22	17	23	26	20
min °C	14	17	9	9	10	10	10	14	10	10	17	13	14	22	15	17	26	17
chill °C	14	17	7	7	9	10	10	14	10	10	17	13	14	22	15	17	26	17

Freezing level m	3050	2800	2450	2300	2500	2950	3400	3350	3300	3200	3200	3550	3950	4150	4350	4400	4450	4450

	6:39	—	—	6:41	—	—	6:41	—	—	6:43	—	—	6:45	—	—	6:46	—	—
	—	7:24	—	—	7:22	—	—	7:21	—	—	7:19	—	—	7:16	—	—	7:15	—

Mount Si Weather (Days 0-3):

The weather forecast for Mount Si is: Heavy rain (total 35mm), heaviest during Sat night. Very mild (max 18°C on Sat morning, min 9°C on Sat night). Wind will be generally light.

Mount Si Weather (Days 3-6):

Mostly dry. Warm (max 26°C on Thu afternoon, min 10°C on Tue 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
Renton 30 km WSW 160m alt. 1 hour ago	18°C	Dry	Calm (2 kph at 31).
Black Diamond 32 km SSW 192m alt. 1 hour ago		-	Wind obs. (11 kph from 360 degs) was rejected.
Renton Airport 36 km WSW 218m alt. 3 hours ago	17°C	Clear	Light winds from the N (6 kph at 10).	16 km
Auburn 39 km SW 119m alt. 59 minutes ago		-	Calm (5 kph at 257).
Stampede Pass Airport 40 km SE 628m alt. 3 hours ago	12°C	Clear	Calm (0 kph at 0).	16 km
SHIP5793 43 km W 3m alt. 4 hours ago	17°C
SHIP9794 43 km W 3m alt. 4 hours ago	17°C
SHIP4989 43 km W 15m alt. 4 hours ago				- km
SHIP9970 43 km W 3m alt. 4 hours ago	17°C
SHIP3465 43 km W 15m alt. 4 hours ago				- 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.