– Lat/Long: 47.51° N 121.74° W

Mount Si
Weather Forecast, United States
Issued: 4 pm Sun 10 May Local Time
Updates in:
hr min s
Update imminent

Issued: 4 pm Sun 10 May Local Time

Updates in:

hr min s

Update imminent

2 Mount Si Elevations: 2 Forecast Elevations:

	Days 1–4 Weather Summary Some drizzle, heaviest during Sun night. Very mild (max 19°C on Tue afternoon, min 4°C on Sun night). Wind will be generally light.											Days 5–7 Weather Summary Light rain (total 8mm), mostly falling on Fri afternoon. Freeze-thaw conditions (max 14°C on Wed afternoon, min -1°C on Fri night). Winds increasing (light winds from the WNW on Thu morning, fresh winds from the WSW by Fri night).
	Sun 10		Monday 11			Tuesday 12			Wednesday 13			Thursday 14			Friday 15
	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night

	cloudy	rain shwrs	clear	clear	clear	some clouds	some clouds	some clouds	some clouds	clear	some clouds	clear	rain shwrs	some clouds	light rain	mod. rain	rain shwrs
km/h	W	NNW	NNE	NNE	ESE	ESE	SW	NNE	NW	WNW	SW	WNW	WSW	SW	SW	WSW	WSW
See all weather maps
cm	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—
mm	—	1	—	—	—	—	—	—	—	—	—	—	0.1	—	1.1	6	1
max °C	8	6	7	11	14	16	19	17	13	14	10	6	5	6	3	4	2
min °C	6	4	5	10	13	15	18	13	12	13	5	5	5	2	3	3	-1
chill °C	4	0	2	10	13	14	18	13	12	13	2	4	3	-3	-2	-3	-8

Freezing level m	2350	2250	3200	3450	3750	3900	3850	3800	3550	3400	3200	2950	2850	1850	1800	1800	1200
Cloud base (m)	1600	950		8500	9100	6450	8800	5650	4250		3300	2000	850		500	400	800

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

Mount Si Weather (Days 0-3):

The weather forecast for Mount Si is: Some drizzle, heaviest during Sun night. Very mild (max 19°C on Tue afternoon, min 4°C on Sun night). Wind will be generally light.

Mount Si Weather (Days 3-6):

Light rain (total 8mm), mostly falling on Fri afternoon. Freeze-thaw conditions (max 14°C on Wed afternoon, min -1°C on Fri night). Winds increasing (light winds from the WNW on Thu morning, fresh winds from the WSW 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. 1 hour ago	19° C	Dry	Calm (0 kph at 240).
Renton 30 km WSW 160m alt. 1 hour ago	18° C	Dry	Calm (2 kph at 117).
Black Diamond 32 km SSW 192m alt. 56 minutes ago		-	Light winds from the SW (10 kph at 221).
Grotto wx 35 km NE 321m alt. 28 minutes ago	16° C	Dry	Light winds from the WSW (6 kph at 253).
Renton Airport 36 km WSW 218m alt. 2 hours ago		-	Light winds from the N (9 kph at 350).	16 km
Grotto wx 39 km NE 1101m alt. 57 minutes ago	9° C	Dry	Calm (5 kph at 63).
Auburn 39 km SW 119m alt. 53 minutes ago	27° C	Dry	Calm (5 kph at 205).
Stampede Pass Airport 40 km SE 628m alt. 1 hour ago	9° C	Dry and cloudy.	Wind obs. (11 kph from 1 degs) was rejected.	16 km Low: few Mid: overcast
SHIP8698 43 km W 15m alt. 3 hours ago				- km
SHIP2985 43 km W 15m alt. 3 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.