– Lat/Long: 47.51° N 121.74° W

Mount Si
Weather Forecast, United States
Issued: 10 am Thu 09 Apr Local Time
Updates in:
hr min s
Update imminent

Issued: 10 am Thu 09 Apr Local Time

Updates in:

hr min s

Update imminent

2 Mount Si Elevations: 2 Forecast Elevations:

	Days 1–3 Weather Summary Light rain (total 7mm), mostly falling on Sat night. Very mild (max 11°C on Thu afternoon, min 2°C on Sat afternoon). Wind will be generally light.									Days 4–6 Weather Summary Drizzle, on Sun afternoon followed by colder weather and a moderate fall of snow, heaviest on Tue night.. Freeze-thaw conditions (max 4°C on Sun afternoon, min -4°C on Tue night). Winds increasing (light winds from the WNW on Sun morning, gales from the SW by Tue night).
	Thursday 9			Friday 10			Saturday 11			Sunday 12			Monday 13			Tuesday 14
	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night

	clear	clear	clear	some clouds	cloudy	light rain	light rain	light rain	light rain	light rain	rain shwrs	light rain	cloudy	cloudy	cloudy	light snow	light snow	heavy snow
km/h	ESE	ENE	ESE	SSE	NNW	N	WSW	SW	WSW	NW	W	SSW	SW	WSW	SW	SW	SW	SW
See all weather maps
cm	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	3	2	14
mm	—	—	—	—	—	1.6	0.2	1.8	3	0.1	1.1	0.6	—	—	—	—	—	—
max °C	8	11	11	10	9	8	5	2	2	3	4	3	-1	0	0	-1	-1	0
min °C	7	10	9	9	9	5	3	2	2	2	3	-2	-2	0	-2	-2	-1	-4
chill °C	5	10	8	9	9	5	1	-2	0	0	0	-9	-9	-6	-9	-10	-9	-11

Freezing level m	2650	2800	2850	2700	2600	2350	1900	1750	1700	1800	1850	1100	1100	1300	1000	1050	1150	1250
Cloud base (m)	9200	9200	9200	3050	2550	450	400	400	400	500	600	400	500	400	400	500	400	400

	6:30	—	—	6:28	—	—	6:26	—	—	6:24	—	—	6:22	—	—	6:20	—	—
	—	7:46	—	—	7:49	—	—	7:50	—	—	7:51	—	—	7:52	—	—	7:53	—

Mount Si Weather (Days 0-3):

The weather forecast for Mount Si is: Light rain (total 7mm), mostly falling on Sat night. Very mild (max 11°C on Thu afternoon, min 2°C on Sat afternoon). Wind will be generally light.

Mount Si Weather (Days 3-6):

Drizzle, on Sun afternoon followed by colder weather and a moderate fall of snow, heaviest on Tue night.. Freeze-thaw conditions (max 4°C on Sun afternoon, min -4°C on Tue night). Winds increasing (light winds from the WNW on Sun morning, gales from the SW by Tue 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. 23 minutes ago	20° C	Dry	Calm (3 kph at 330).
Snoqualmie Pass 30 km ESE 824m alt. 30 minutes ago	16° C	-	Calm (0 kph at 345).
Renton 30 km WSW 160m alt. 1 hour ago	19° C	Dry	Calm (5 kph at 286).
Black Diamond 32 km SSW 192m alt. 51 minutes ago		-	Wind obs. (8 kph from 256 degs) was rejected.
Grotto wx 35 km NE 321m alt. 54 minutes ago	20° C	Dry	Moderate winds from the W (21 kph at 274).
Renton Airport 36 km WSW 218m alt. 2 hours ago	18° C	Clear	Light winds from the NNW (19 kph at 330).	16 km
Grotto wx 39 km NE 1101m alt. 56 minutes ago	17° C	Dry	Calm (0 kph at 180).
Auburn 39 km SW 119m alt. 2 hours ago	28° C	Dry	Calm (3 kph at 232).
Stampede Pass Airport 40 km SE 628m alt. 2 hours ago	13° C	Clear	Calm (0 kph at 0).	16 km
Woodinville 43 km WNW 137.2m alt. 39 minutes ago	17° C	Dry	Wind obs. (10 kph from 110 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.