– Lat/Long: 47.51° N 121.74° W

Mount Si
Weather Forecast, United States
Issued: 10 am Wed 20 May Local Time
Updates in:
hr min s
Update imminent

Issued: 10 am Wed 20 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 4°C on Wed morning). Wind will be generally light.									Days 4–6 Weather Summary Heavy rain (total 22mm), heaviest during Sun night. Later becoming colder with a dusting of snow on Sun night. Very mild (max 12°C on Sat afternoon, min 2°C on Sun night). Winds increasing (light winds from the WNW on Sat morning, fresh winds from the SW by Mon morning).
	Wednesday 20			Thursday 21			Friday 22			Saturday 23			Sunday 24			Monday 25
	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night

	rain shwrs	some clouds	clear	clear	some clouds	clear	clear	clear	some clouds	clear	clear	some clouds	clear	some clouds	light snow	light rain	mod. rain	rain shwrs
km/h	NNW	NW	ENE	SSE	WNW	NNW	WNW	WNW	NW	WNW	NW	WSW	SW	WSW	SSW	SW	WSW	NNW
See all weather maps
cm	—	—	—	—	—	—	—	—	—	—	—	—	—	—	2	—	—	—
mm	0.2	—	—	—	—	—	—	—	—	—	—	—	—	—	9	5	6	2
max °C	5	8	10	12	13	12	9	12	11	9	12	11	5	8	4	3	3	3
min °C	4	7	8	11	13	9	9	11	8	8	11	5	4	7	2	3	3	2
chill °C	1	6	7	10	12	8	9	10	7	7	10	2	-1	3	-4	-3	-2	-1

Freezing level m	2600	3100	3000	2900	3100	3050	3100	3350	3450	3400	3200	2950	2550	2350	1900	1700	1750	1850
Cloud base (m)	700	1600	6900	6000	5950	8750	8600	9500		600	8700	1500		2150	400	400	400	450

	5:24	—	—	5:22	—	—	5:22	—	—	5:20	—	—	5:20	—	—	5:18	—	—
	—	—	8:43	—	—	8:44	—	—	8:45	—	—	8:45	—	—	8:46	—	—	8:49

Mount Si Weather (Days 0-3):

The weather forecast for Mount Si is: Mostly dry. Very mild (max 13°C on Thu afternoon, min 4°C on Wed morning). Wind will be generally light.

Mount Si Weather (Days 3-6):

Heavy rain (total 22mm), heaviest during Sun night. Later becoming colder with a dusting of snow on Sun night. Very mild (max 12°C on Sat afternoon, min 2°C on Sun night). Winds increasing (light winds from the WNW on Sat morning, fresh winds from the SW by Mon 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. 1 hour ago	20° C	Dry	Calm (0 kph at 3).
Snoqualmie Pass 30 km ESE 824m alt. 1 hour ago	18° C	-	Calm (0 kph at 179).
Renton 30 km WSW 160m alt. 1 hour ago	16° C	Dry	Calm (5 kph at 314).
Black Diamond 32 km SSW 192m alt. 59 minutes ago		-	Calm (0 kph at 80).
Grotto wx 35 km NE 321m alt. 2 hours ago	16° C	Dry	Light winds from the W (18 kph at 273).
Renton Airport 36 km WSW 218m alt. 3 hours ago	16° C	Clear	Moderate winds from the NNW (20 kph at 330).	16 km
Grotto wx 39 km NE 1101m alt. 48 minutes ago	13° C	Dry	Calm (2 kph at 74).
Auburn 39 km SW 119m alt. 55 minutes ago		-	Calm (5 kph at 211).
Stampede Pass Airport 40 km SE 628m alt. 3 hours ago	12° C	Clear	Wind obs. (7 kph from 220 degs) was rejected.	16 km
Woodinville 43 km WNW 137.2m alt. 1 hour ago	21° C	Dry	Calm (0 kph at 325).

* 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.