– Lat/Long: 47.51° N 121.74° W

Mount Si
Weather Forecast, United States
Issued: 9 pm Sat 17 Jan Local Time
Updates in:
hr min s
Update imminent

Issued: 9 pm Sat 17 Jan Local Time

Updates in:

hr min s

Update imminent

2 Mount Si Elevations: 2 Forecast Elevations:

	Days 1–4 Weather Summary Mostly dry. Very mild (max 11°C on Sun morning, min 7°C on Tue afternoon). Wind will be generally light.										Days 5–7 Weather Summary A dusting of new snow. Freeze-thaw conditions (max 6°C on Tue night, min -2°C on Thu afternoon). Winds increasing (light winds from the S on Tue night, fresh winds from the WSW by Thu night).
		Sunday 18			Monday 19			Tuesday 20			Wednesday 21			Thursday 22			Friday 23
	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night

	clear	clear	clear	clear	clear	clear	clear	some clouds	some clouds	some clouds	cloudy	cloudy	some clouds	cloudy	cloudy	cloudy	light snow	light snow	light snow
km/h	ENE	E	SSE	E	ESE	W	W	NNE	SSW	SSW	S	SSW	SW	SW	SW	SW	WSW	WSW	WSW
See all weather maps
cm	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	2	2	1
mm	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—
max °C	10	11	10	8	11	10	10	9	8	6	6	6	3	-1	-1	0	0	0	0
min °C	9	10	8	8	9	10	8	9	7	5	6	4	0	-1	-2	-2	-1	0	0
chill °C	9	10	8	8	8	10	8	8	7	3	5	1	-5	-6	-9	-9	-7	-6	-6

Freezing level m	3600	3500	3500	3300	3250	3400	3550	3500	3350	3250	3100	2750	1950	1200	1100	1000	1150	1250	1250
Cloud base (m)			8300				8400		6950	6850	7050	6400	5250	800	400	450	400	400	400

	—	7:47	—	—	7:46	—	—	7:46	—	—	7:45	—	—	7:43	—	—	7:43	—	—
	—	—	4:46	—	—	4:49	—	—	4:50	—	—	4:51	—	—	4:52	—	—	4:53	—

Mount Si Weather (Days 0-3):

The weather forecast for Mount Si is: Mostly dry. Very mild (max 11°C on Sun morning, min 7°C on Tue afternoon). Wind will be generally light.

Mount Si Weather (Days 3-6):

A dusting of new snow. Freeze-thaw conditions (max 6°C on Tue night, min -2°C on Thu afternoon). Winds increasing (light winds from the S on Tue night, fresh winds from the WSW by Thu night).

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. 1 hour ago	1° C	-	Calm (0 kph at 337).
Renton Airport 36 km WSW 218m alt. 2 hours ago	4° C	Clear	Calm (0 kph at 0).	16 km
Auburn 39 km SW 119m alt. 2 hours ago	-5° C	-	Calm (0 kph at 103).
Stampede Pass Airport 40 km SE 628m alt. 1 hour ago	-7° C	Mist -.	Wind obs. (6 kph from 50 degs) was rejected.	5 km Low: overcast
SHIP129 43 km W -m alt. 2 hours ago	8° C	No report.	Calm (2 kph at 120).
SHIP132 43 km W -m alt. 3 hours ago	9° C	No report.	Light winds from the N (7 kph at 10).
SHIP5719 43 km W 15m alt. 3 hours ago				- km
SHIP1018 43 km W -m alt. 2 hours ago	8° C	No report.	Calm (4 kph at 200).
SHIP5968 43 km W 15m alt. 3 hours ago	10° C		Light winds from the NNW (12 kph at 340).	- km
SHIP1898 43 km W 15m alt. 3 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.