– Lat/Long: 47.51° N 121.74° W

Mount Si
Weather Forecast, United States
Issued: 4 am Mon 11 May Local Time
Updates in:
hr min s
Update imminent

Issued: 4 am Mon 11 May Local Time

Updates in:

hr min s

Update imminent

2 Mount Si Elevations: 2 Forecast Elevations:

	Days 1–3 Weather Summary A dusting of snow giving way to moderate rain (total 18mm) heaviest on Wed night. Very mild (max 18°C on Tue afternoon, min 2°C on Wed morning). Winds increasing (calm on Mon afternoon, strong winds from the WSW by Wed night).									Days 4–6 Weather Summary A light covering of new snow mostly falling on Fri afternoon. Becoming milder with light rain (total 3mm) on Fri afternoon. Freeze-thaw conditions (max 3°C on Thu afternoon, min -1°C on Fri night). Winds decreasing (strong winds from the WSW on Fri afternoon, light winds from the SW by Sat morning).
	Monday 11			Tuesday 12			Wednesday 13			Thursday 14			Friday 15			Saturday 16
	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night

	clear	clear	clear	some clouds	some clouds	rain shwrs	light snow	light snow	heavy rain	cloudy	light rain	rain shwrs	light snow	snow shwrs	snow shwrs	some clouds	rain shwrs	clear
km/h	NNE	NNE	ESE	ESE	WSW	W	SW	WSW	WSW	SW	WSW	SW	SW	WSW	WSW	SW	NNW	NNW
See all weather maps
cm	—	—	—	—	—	—	1	3	—	—	—	—	1	2	2	—	—	—
mm	—	—	—	—	—	0.3	0.1	4	13	—	0.1	0.1	—	2	—	—	0.2	—
max °C	7	11	14	16	18	14	5	3	4	1	3	3	2	2	0	0	3	2
min °C	6	10	13	15	16	7	2	2	2	0	1	1	1	1	-1	-1	2	1
chill °C	3	10	13	14	16	5	-2	-4	-5	-6	-4	-3	-4	-6	-8	-4	0	-3

Freezing level m	3250	3450	3800	3850	3800	3400	1700	1850	1700	1350	1650	1650	1600	1550	1050	1250	1650	1500
Cloud base (m)			9050	6700	8650	3900	1900	400	450	450	700	1800	850	450	450	600	1500

	5:35	—	—	5:33	—	—	5:31	—	—	5:31	—	—	5:30	—	—	5:28	—	—
	—	—	8:30	—	—	8:32	—	—	8:34	—	—	8:35	—	—	8:37	—	—	8:37

Mount Si Weather (Days 0-3):

The weather forecast for Mount Si is: A dusting of snow giving way to moderate rain (total 18mm) heaviest on Wed night. Very mild (max 18°C on Tue afternoon, min 2°C on Wed morning). Winds increasing (calm on Mon afternoon, strong winds from the WSW by Wed night).

Mount Si Weather (Days 3-6):

A light covering of new snow mostly falling on Fri afternoon. Becoming milder with light rain (total 3mm) on Fri afternoon. Freeze-thaw conditions (max 3°C on Thu afternoon, min -1°C on Fri night). Winds decreasing (strong winds from the WSW on Fri afternoon, light winds from the SW by Sat 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. 2 hours ago	11° C	Dry	Calm (0 kph at 11).
Renton 30 km WSW 160m alt. 1 hour ago	10° C	Dry	Calm (0 kph at 327).
Black Diamond 32 km SSW 192m alt. 41 minutes ago		-	Calm (0 kph at 0).
Grotto wx 35 km NE 321m alt. 43 minutes ago	8° C	Dry	Calm (2 kph at 79).
Renton Airport 36 km WSW 218m alt. 3 hours ago		Dry and cloudy.	Calm (0 kph at 0).	16 km Low: scattered Mid: overcast
Grotto wx 39 km NE 1101m alt. 54 minutes ago	3° C	Dry	Calm (0 kph at 12).
Auburn 39 km SW 119m alt. 46 minutes ago	10° C	Dry	Calm (0 kph at 92).
Stampede Pass Airport 40 km SE 628m alt. 2 hours ago	4° C	Fog -.	Light winds from the SW (7 kph at 230).	0 km
Woodinville 43 km WNW 137.2m alt. 2 hours ago	4° C	Dry	Calm (0 kph at 91).
Seattl / oeing Airport 44 km WSW 218m alt. 3 hours ago	13° C	Dry and partly cloudy.	Light winds from the E (6 kph at 90).	16 km Low: broken

* 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.