– Lat/Long: 47.51° N 121.74° W

Mount Si
Weather Forecast, United States
Issued: 10 pm Wed 13 May Local Time
Updates in:
hr min s
Update imminent

Issued: 10 pm Wed 13 May Local Time

Updates in:

hr min s

Update imminent

2 Mount Si Elevations: 2 Forecast Elevations:

	Days 1–4 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 Fri morning). Winds decreasing (near gales from the WSW on Wed night, light winds from the W by Sat afternoon).										Days 5–7 Weather Summary A dusting of snow turning to light rain (total 4mm) on Tue afternoon. Freeze-thaw conditions (max 7°C on Tue afternoon, min -1°C on Sat night). Wind will be generally light.
		Thursday 14			Friday 15			Saturday 16			Sunday 17			Monday 18			Tuesday 19
	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night

	light rain	rain shwrs	light rain	snow shwrs	cloudy	light snow	mod. snow	light snow	light snow	snow shwrs	some clouds	some clouds	some clouds	rain shwrs	light rain	light rain	rain shwrs	rain shwrs	rain shwrs
km/h	WSW	WSW	WSW	WSW	SW	SW	SW	WSW	NNW	NNW	NNW	NNW	WNW	WSW	W	WNW	NNW	NNW	N
See all weather maps
cm	—	—	—	5	—	3	6	2	3	1	—	—	—	—	—	—	—	—	—
mm	0.9	0.7	2	—	—	—	—	—	—	—	—	—	—	0.1	0.2	1.4	0.8	1.2	0.1
max °C	3	3	4	2	0	0	0	0	1	0	0	3	3	2	4	4	5	7	6
min °C	2	2	3	0	-1	0	-1	-1	1	-1	-1	2	1	1	4	4	4	6	5
chill °C	-4	-3	-3	-7	-8	-7	-8	-8	-2	-5	-4	0	1	-1	2	2	2	4	3

Freezing level m	1700	1650	1650	1400	1200	1350	1150	1200	1400	1100	1300	1700	1600	1500	1950	2000	2200	2450	3250
Cloud base (m)	450	800	750	400	650	400	500	450	700	650	500	900	1850	800	1550	450	600	1650	2050

	—	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 Fri morning). Winds decreasing (near gales from the WSW on Wed night, light winds from the W by Sat afternoon).

Mount Si Weather (Days 3-6):

A dusting of snow turning to light rain (total 4mm) on Tue afternoon. Freeze-thaw conditions (max 7°C on Tue afternoon, min -1°C on Sat night). 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. 54 minutes ago	9° C	Dry	Calm (0 kph at 8).
Snoqualmie Pass 30 km ESE 824m alt. 57 minutes ago	7° C	-	Calm (0 kph at 172).
Renton 30 km WSW 160m alt. 2 hours ago	12° C	Dry	Light winds from the SSW (10 kph at 207).
Black Diamond 32 km SSW 192m alt. 2 hours ago		-	Wind obs. (8 kph from 360 degs) was rejected.
Grotto wx 35 km NE 321m alt. 2 hours ago	9° C	Dry	Calm (2 kph at 247).
Renton Airport 36 km WSW 218m alt. 1 hour ago	12° C	Dry and cloudy.	Light winds from the S (19 kph at 180).	16 km Low: scattered Mid: overcast
Grotto wx 39 km NE 1101m alt. 1 hour ago	4° C	Dry	Calm (3 kph at 41).
Auburn 39 km SW 119m alt. 48 minutes ago	19° C	Dry	Calm (0 kph at 276).
Stampede Pass Airport 40 km SE 628m alt. 1 hour ago	3° C	Light rain .	Light winds from the N (9 kph at 1).	0 km
Woodinville 43 km WNW 137.2m alt. 1 hour ago	9° C	Dry	Wind obs. (10 kph from 323 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.