– Lat/Long: 47.51° N 121.74° W

Mount Si
Weather Forecast, United States
Issued: 9 pm Thu 29 Jan Local Time
Updates in:
hr min s
Update imminent

Issued: 9 pm Thu 29 Jan Local Time

Updates in:

hr min s

Update imminent

2 Mount Si Elevations: 2 Forecast Elevations:

	Days 1–4 Weather Summary Moderate rain (total 16mm) heaviest on Fri morning, then becoming colder with a dusting of snow on Sun morning. Mild temperatures (max 9°C on Sat night, min 2°C on Sun morning). Winds decreasing (strong winds from the SW on Fri afternoon, light winds from the SSE by Fri night).										Days 5–7 Weather Summary Light rain (total 3mm), mostly falling on Mon night. Freeze-thaw conditions (max 10°C on Wed morning, min 0°C on Sun night). Winds decreasing (fresh winds from the SW on Sun night, calm by Wed afternoon).
		Friday 30			Saturday 31			Sunday 1			Monday 2			Tuesday 3			Wednesday 4
	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night

	light rain	light rain	light rain	light rain	light rain	some clouds	some clouds	light snow	light snow	cloudy	cloudy	cloudy	light rain	some clouds	cloudy	some clouds	some clouds	some clouds	clear
km/h	SSW	SSW	SW	SW	SSE	S	SSE	SSE	SW	SW	SW	SW	SW	ESE	SE	S	SW	W	NE
See all weather maps
cm	—	—	—	—	—	—	—	3	1	—	—	—	—	—	—	—	—	—	—
mm	4	3	5	0.3	0.2	—	—	—	3	—	—	—	3	—	—	—	—	—	—
max °C	6	5	5	7	8	8	9	2	2	1	1	2	5	9	9	9	10	9	12
min °C	4	4	4	5	7	8	6	2	2	0	0	2	3	7	9	9	10	9	10
chill °C	-1	-2	-2	2	5	6	4	-3	-4	-6	-6	-2	-2	6	8	8	8	8	10

Freezing level m	2350	2050	2100	2350	2500	2450	2500	1550	1650	1400	1350	1550	2150	2750	3100	3200	3150	3000	3450
Cloud base (m)	450	2450	600	800	2000	5000	5400	1550	400	850	550	500	500	550	6250	5700	5900	5050	8250

	—	7:35	—	—	7:33	—	—	7:31	—	—	7:31	—	—	7:30	—	—	7:28	—	—
	—	—	5:05	—	—	5:07	—	—	5:07	—	—	5:09	—	—	5:10	—	—	5:13	—

Mount Si Weather (Days 0-3):

The weather forecast for Mount Si is: Moderate rain (total 16mm) heaviest on Fri morning, then becoming colder with a dusting of snow on Sun morning. Mild temperatures (max 9°C on Sat night, min 2°C on Sun morning). Winds decreasing (strong winds from the SW on Fri afternoon, light winds from the SSE by Fri night).

Mount Si Weather (Days 3-6):

Light rain (total 3mm), mostly falling on Mon night. Freeze-thaw conditions (max 10°C on Wed morning, min 0°C on Sun night). Winds decreasing (fresh winds from the SW on Sun night, calm by Wed afternoon).

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 29).
Black Diamond 32 km SSW 192m alt. 1 hour ago	8° C	Dry	Calm (0 kph at 0).
Renton Airport 36 km WSW 218m alt. 3 hours ago	9° C	Light rain .	Wind obs. (6 kph from 160 degs) was rejected.	13 km Low: scattered Mid: overcast
Auburn 39 km SW 119m alt. 1 hour ago	-3° C	-	Calm (0 kph at 63).
Stampede Pass Airport 40 km SE 628m alt. 3 hours ago	1° C	Moderate rain .	Wind obs. (6 kph from 1 degs) was rejected.	0 km
Seattl / oeing Airport 44 km WSW 218m alt. 3 hours ago	9° C	Light rain .	Light winds from the SE (11 kph at 140).	14 km Low: overcast
Seattle Tacoma International Airport 44 km WSW 218m alt. 3 hours ago	9° C	Light rain .	Light winds from the SE (13 kph at 140).	10 km Mid: overcast
Snohomish 49 km NW 196m alt. 2 hours ago	8° C	Dry	Calm (0 kph at 273).
BUOY-WPOW1 55 km W 3m alt. 2 hours ago	10° C		Moderate winds from the SSE (26 kph at 150).
BUOY-TCNW1 57 km SW 3m alt. 2 hours ago

* 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.