– Lat/Long: 47.51° N 121.74° W

Mount Si
Weather Forecast, United States
Issued: 10 am Thu 21 May Local Time
Updates in:
hr min s
Update imminent

Issued: 10 am Thu 21 May Local Time

Updates in:

hr min s

Update imminent

2 Mount Si Elevations: 2 Forecast Elevations:

	Days 1–3 Weather Summary Mostly dry. Very mild (max 13°C on Thu afternoon, min 5°C on Sat night). Wind will be generally light.									Days 4–6 Weather Summary Moderate rain (total 18mm) heaviest on Mon morning, then becoming colder with a dusting of snow on Mon night. Freeze-thaw conditions (max 9°C on Sun afternoon, min -1°C on Tue night). Winds decreasing (fresh winds from the SSW on Mon morning, light winds from the W by Tue morning).
	Thursday 21			Friday 22			Saturday 23			Sunday 24			Monday 25			Tuesday 26
	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night

	clear	some clouds	clear	clear	clear	some clouds	clear	clear	some clouds	some clouds	some clouds	some clouds	mod. rain	mod. rain	light snow	snow shwrs	rain shwrs	light rain
km/h	SSE	WNW	NNW	NW	NW	N	W	WNW	W	SW	SW	SW	SSW	SW	NW	W	WSW	SW
See all weather maps
cm	—	—	—	—	—	—	—	—	—	—	—	—	—	—	3	1	—	—
mm	—	—	—	—	—	—	—	—	—	—	—	—	8	6	—	0.8	3	0.9
max °C	12	13	12	9	12	11	9	12	11	7	9	9	3	4	2	3	4	3
min °C	11	12	9	9	11	9	8	11	5	6	8	4	2	2	2	2	4	-1
chill °C	10	11	8	8	10	9	8	10	2	3	6	0	-3	-4	-2	-2	1	-8

Freezing level m	2900	3050	2950	2850	3150	3350	3300	3200	3000	3100	3000	2650	1850	1700	1500	1700	1950	1400
Cloud base (m)	6550		8650	6550	1850	6900	500	1600	1750		5350	3100	700	400	400	450	700	400

	5:22	—	—	5:22	—	—	5:20	—	—	5:20	—	—	5:18	—	—	5:18	—	—
	—	—	8:44	—	—	8:45	—	—	8:45	—	—	8:46	—	—	8:49	—	—	8:50

Mount Si Weather (Days 0-3):

The weather forecast for Mount Si is: Mostly dry. Very mild (max 13°C on Thu afternoon, min 5°C on Sat night). Wind will be generally light.

Mount Si Weather (Days 3-6):

Moderate rain (total 18mm) heaviest on Mon morning, then becoming colder with a dusting of snow on Mon night. Freeze-thaw conditions (max 9°C on Sun afternoon, min -1°C on Tue night). Winds decreasing (fresh winds from the SSW on Mon morning, light winds from the W by Tue morning).

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. 50 minutes ago	24° C	Dry	Calm (0 kph at 342).
Snoqualmie Pass 30 km ESE 824m alt. 1 hour ago	23° C	-	Calm (0 kph at 219).
Renton 30 km WSW 160m alt. 1 hour ago	25° C	Dry	Calm (2 kph at 0).
Black Diamond 32 km SSW 192m alt. 1 hour ago		-	Calm (3 kph at 159).
Grotto wx 35 km NE 321m alt. 56 minutes ago	24° C	Dry	Light winds from the W (16 kph at 265).
Renton Airport 36 km WSW 218m alt. 3 hours ago	22° C	Clear	Light winds from the NNW (9 kph at 340).	16 km
Grotto wx 39 km NE 1101m alt. 48 minutes ago	19° C	Dry	Calm (5 kph at 61).
Auburn 39 km SW 119m alt. 1 hour ago	28° C	Dry	Calm (0 kph at 220).
Stampede Pass Airport 40 km SE 628m alt. 3 hours ago	19° C	Clear	Calm (0 kph at 0).	16 km
Woodinville 43 km WNW 137.2m alt. 1 hour ago	22° C	Dry	Wind obs. (6 kph from 136 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.