– Lat/Long: 47.51° N 121.74° W

Mount Si
Weather Forecast, United States
Issued: 10 am Tue 19 May Local Time
Updates in:
hr min s
Update imminent

Issued: 10 am Tue 19 May Local Time

Updates in:

hr min s

Update imminent

2 Mount Si Elevations: 2 Forecast Elevations:

	Days 1–3 Weather Summary Light rain (total 2mm), mostly falling on Tue afternoon. Very mild (max 13°C on Thu afternoon, min 4°C on Tue morning). Wind will be generally light.									Days 4–6 Weather Summary Light rain (total 6mm) at first, then becoming colder with a dusting of snow on Sun night. Very mild (max 12°C on Fri afternoon, min 2°C on Sun night). Winds increasing (calm on Fri morning, fresh winds from the SW by Sun night).
	Tuesday 19			Wednesday 20			Thursday 21			Friday 22			Saturday 23			Sunday 24
	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night

	light rain	rain shwrs	rain shwrs	rain shwrs	rain shwrs	some clouds	clear	clear	clear	clear	clear	clear	some clouds	some clouds	some clouds	some clouds	cloudy	light snow
km/h	WNW	NW	NNW	N	NW	NNE	S	WNW	NNW	NW	NW	N	NW	NW	NW	SW	WSW	SW
See all weather maps
cm	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	1
mm	0.2	1.3	0.6	0.1	0.1	—	—	—	—	—	—	—	—	—	—	—	—	6
max °C	5	6	5	5	8	9	11	13	12	9	12	11	10	12	11	8	9	4
min °C	4	5	4	4	7	7	10	12	9	9	11	9	10	11	8	8	7	2
chill °C	4	3	2	1	6	6	10	12	8	8	10	9	9	10	8	5	3	-4

Freezing level m	2100	2200	2700	2550	3100	3250	3050	3200	3150	3250	3450	3550	3500	3350	3350	2850	2500	1950
Cloud base (m)	550	750	1900	550	900	6650	8400		9000			8400	6200	7600	1850	6500	1650	400

	5:24	—	—	5:24	—	—	5:22	—	—	5:22	—	—	5:20	—	—	5:20	—	—
	—	—	8:42	—	—	8:43	—	—	8:44	—	—	8:45	—	—	8:45	—	—	8:46

Mount Si Weather (Days 0-3):

The weather forecast for Mount Si is: Light rain (total 2mm), mostly falling on Tue afternoon. Very mild (max 13°C on Thu afternoon, min 4°C on Tue morning). Wind will be generally light.

Mount Si Weather (Days 3-6):

Light rain (total 6mm) at first, then becoming colder with a dusting of snow on Sun night. Very mild (max 12°C on Fri afternoon, min 2°C on Sun night). Winds increasing (calm on Fri morning, fresh winds from the SW by Sun 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. 1 hour ago	15° C	Dry	Calm (2 kph at 103).
Snoqualmie Pass 30 km ESE 824m alt. 45 minutes ago	13° C	-	Calm (0 kph at 196).
Renton 30 km WSW 160m alt. 50 minutes ago	14° C	Dry	Calm (2 kph at 212).
Black Diamond 32 km SSW 192m alt. 1 hour ago		-	Calm (2 kph at 219).
Grotto wx 35 km NE 321m alt. 2 hours ago	11° C	Dry	Calm (3 kph at 229).
Renton Airport 36 km WSW 218m alt. 2 hours ago	14° C	Dry and cloudy.	Light winds from the N (9 kph at 1).	16 km Low: overcast
Grotto wx 39 km NE 1101m alt. 2 hours ago	7° C	Dry	Calm (2 kph at 171).
Auburn 39 km SW 119m alt. 3 hours ago		-	Calm (2 kph at 350).
Stampede Pass Airport 40 km SE 628m alt. 2 hours ago	6° C	Dry and cloudy.	Wind obs. (6 kph from 1 degs) was rejected.	16 km Low: broken Mid: broken High: overcast
SHIP5779 43 km W 3m alt. 2 hours ago	17° C

* 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.