– Lat/Long: 47.51° N 121.74° W

Mount Si
Weather Forecast, United States
Issued: 4 am Thu 14 May Local Time
Updates in:
hr min s
Update imminent

Issued: 4 am Thu 14 May Local Time

Updates in:

hr min s

Update imminent

2 Mount Si Elevations: 2 Forecast Elevations:

	Days 1–3 Weather Summary Mild at first with light rain (total 4mm) on Thu afternoon followed by colder weather and light fall of snow, heaviest on Fri night. Freeze-thaw conditions (max 4°C on Thu afternoon, min -1°C on Thu night). Winds decreasing (fresh winds from the WSW on Thu night, light winds from the NW by Sat afternoon).									Days 4–6 Weather Summary Mostly dry. Freeze-thaw conditions (max 6°C on Tue afternoon, min -1°C on Sun morning). Wind will be generally light.
	Thursday 14			Friday 15			Saturday 16			Sunday 17			Monday 18			Tuesday 19
	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night

	rain shwrs	light rain	light snow	some clouds	light snow	light snow	snow shwrs	snow shwrs	some clouds	some clouds	some clouds	some clouds	some clouds	rain shwrs	rain shwrs	some clouds	rain shwrs	rain shwrs
km/h	WSW	SW	SW	SW	SW	WSW	NW	NNW	NNW	NNW	NNW	NW	NW	NW	NW	NNW	NW	N
See all weather maps
cm	—	—	3	—	3	5	2	2	—	—	—	—	—	—	—	—	—	—
mm	0.7	4	—	—	—	—	—	—	—	—	—	—	—	0.1	0.1	—	0.2	0.1
max °C	3	4	2	-1	0	0	-1	1	0	0	3	3	3	5	5	4	6	6
min °C	2	2	-1	-1	0	-1	-1	0	-1	-1	1	2	2	4	3	4	6	4
chill °C	-4	-4	-8	-8	-7	-8	-7	-3	-5	-5	-1	0	1	2	0	2	4	1

Freezing level m	1700	1600	1350	1200	1250	1200	1150	1350	1250	1300	1700	1750	1550	2000	2150	2150	2400	3200
Cloud base (m)	750	700	450	700	400	400	450	750	750	700	850		2550	1800	1750	700	900	2150

	5:31	—	—	5:30	—	—	5:28	—	—	5:26	—	—	5:26	—	—	5:24	—	—
	—	—	8:35	—	—	8:37	—	—	8:37	—	—	8:38	—	—	8:39	—	—	8:42

Mount Si Weather (Days 0-3):

The weather forecast for Mount Si is: Mild at first with light rain (total 4mm) on Thu afternoon followed by colder weather and light fall of snow, heaviest on Fri night. Freeze-thaw conditions (max 4°C on Thu afternoon, min -1°C on Thu night). Winds decreasing (fresh winds from the WSW on Thu night, light winds from the NW by Sat afternoon).

Mount Si Weather (Days 3-6):

Mostly dry. Freeze-thaw conditions (max 6°C on Tue afternoon, min -1°C on Sun 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
Harman Heights wx 6 km SSW 251m alt. 1 hour ago	12° C	Dry	Calm (0 kph at 314).
Snoqualmie Pass 30 km ESE 824m alt. 34 minutes ago	8° C	-	Calm (2 kph at 217).
Renton 30 km WSW 160m alt. 1 hour ago	11° C	Dry	Light winds from the SW (6 kph at 217).
Black Diamond 32 km SSW 192m alt. 1 hour ago		-	Wind obs. (6 kph from 360 degs) was rejected.
Grotto wx 35 km NE 321m alt. 1 hour ago	9° C	Dry	Calm (2 kph at 235).
Renton Airport 36 km WSW 218m alt. 2 hours ago	13° C	Dry and partly cloudy.	Light winds from the S (11 kph at 190).	16 km Low: broken
Grotto wx 39 km NE 1101m alt. 3 hours ago	3° C	Dry	Calm (0 kph at 98).
Auburn 39 km SW 119m alt. 35 minutes ago		-	Calm (0 kph at 24).
Stampede Pass Airport 40 km SE 628m alt. 1 hour ago	3° C	Light rain .	Light winds from the N (9 kph at 1).	8 km Mid: scattered High: broken
Woodinville 43 km WNW 137.2m alt. 2 hours ago	9° C	Dry	Wind obs. (6 kph from 342 degs) was rejected.

* 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.