– Lat/Long: 47.51° N 121.74° W

Mount Si
Weather Forecast, United States
Issued: 4 pm Sun 19 Apr Local Time
Updates in:
hr min s
Update imminent

Issued: 4 pm Sun 19 Apr 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 5mm) on Tue afternoon followed by colder weather and light fall of snow, heaviest on Wed morning. Freeze-thaw conditions (max 14°C on Sun afternoon, min 0°C on Wed morning). Winds increasing (calm on Mon night, fresh winds from the WSW by Wed morning).											Days 5–7 Weather Summary A light covering of new snow mostly falling on Wed afternoon. Freeze-thaw conditions (max 7°C on Fri afternoon, min 0°C on Wed afternoon). Winds decreasing (fresh winds from the SW on Wed afternoon, calm by Fri night).
	Sun 19		Monday 20			Tuesday 21			Wednesday 22			Thursday 23			Friday 24
	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night

	some clouds	some clouds	some clouds	cloudy	some clouds	rain shwrs	light rain	light snow	mod. snow	light snow	light snow	some clouds	rain shwrs	clear	cloudy	clear	some clouds
km/h	ESE	ENE	ESE	WSW	NNE	SW	WSW	SW	WSW	WSW	WNW	N	NNW	NNW	NNW	NW	N
See all weather maps
cm	—	—	—	—	—	—	—	5	8	5	3	—	—	—	—	—	—
mm	—	—	—	—	—	0.2	4	1.3	—	—	—	—	0.2	—	—	—	—
max °C	14	13	14	14	11	5	4	3	1	1	1	1	5	6	6	7	7
min °C	13	11	13	12	7	4	3	1	0	0	1	1	3	5	5	7	6
chill °C	11	11	12	12	7	3	0	-4	-7	-7	-5	-3	1	3	2	6	5

Freezing level m	3050	3150	3200	3050	3050	2450	2150	1650	1300	1450	1400	1350	2000	2450	2550	2500	2350
Cloud base (m)	4700	6200	4150		5600	650	450	400	400	400	400	500	800		6400	5750

	—	—	6:09	—	—	6:07	—	—	6:05	—	—	6:03	—	—	6:01	—	—
	—	8:00	—	—	8:02	—	—	8:04	—	—	8:05	—	—	8:07	—	—	8:07

Mount Si Weather (Days 0-3):

The weather forecast for Mount Si is: Mild at first with light rain (total 5mm) on Tue afternoon followed by colder weather and light fall of snow, heaviest on Wed morning. Freeze-thaw conditions (max 14°C on Sun afternoon, min 0°C on Wed morning). Winds increasing (calm on Mon night, fresh winds from the WSW by Wed morning).

Mount Si Weather (Days 3-6):

A light covering of new snow mostly falling on Wed afternoon. Freeze-thaw conditions (max 7°C on Fri afternoon, min 0°C on Wed afternoon). Winds decreasing (fresh winds from the SW on Wed afternoon, calm by Fri 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. 2 hours ago	24° C	Dry	Calm (0 kph at 304).
Snoqualmie Pass 30 km ESE 824m alt. 35 minutes ago	18° C	-	Calm (0 kph at 315).
Renton 30 km WSW 160m alt. 2 hours ago	26° C	Dry	Calm (5 kph at 278).
Grotto wx 35 km NE 321m alt. 1 hour ago	26° C	Dry	Wind obs. (8 kph from 231 degs) was rejected.
Renton Airport 36 km WSW 218m alt. 2 hours ago	24° C	Clear	Light winds from the NW (19 kph at 320).	16 km
Grotto wx 39 km NE 1101m alt. 2 hours ago	16° C	Dry	Calm (2 kph at 262).
Auburn 39 km SW 119m alt. 1 hour ago	23° C	Dry	Calm (0 kph at 219).
Stampede Pass Airport 40 km SE 628m alt. 2 hours ago	14° C	Clear	Calm (0 kph at 0).	16 km
SHIP4055 43 km W 15m alt. 3 hours ago				- km
SHIP5526 43 km W 15m alt. 2 hours ago				- km

* 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.