– Lat/Long: 47.51° N 121.74° W

Mount Si
Weather Forecast, United States
Issued: 4 pm Mon 18 May Local Time
Updates in:
hr min s
Update imminent

Issued: 4 pm Mon 18 May Local Time

Updates in:

hr min s

Update imminent

2 Mount Si Elevations: 2 Forecast Elevations:

	Days 1–4 Weather Summary Mostly dry. Very mild (max 16°C on Thu morning, min 8°C on Mon night). Wind will be generally light.											Days 5–7 Weather Summary Mostly dry. Warm (max 20°C on Fri afternoon, min 9°C on Sat night). Wind will be generally light.
	Mon 18		Tuesday 19			Wednesday 20			Thursday 21			Friday 22			Saturday 23
	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night

	some clouds	some clouds	light rain	rain shwrs	rain shwrs	light rain	some clouds	some clouds	clear	clear	clear	clear	clear	clear	cloudy	clear	clear
km/h	NW	W	WSW	WNW	ENE	NW	NW	ENE	WNW	NW	ENE	NW	NW	S	WNW	WNW	SSW
See all weather maps
cm	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—
mm	—	—	0.2	0.2	0.1	0.1	—	—	—	—	—	—	—	—	—	—	—
max °C	14	11	9	10	10	12	15	13	16	19	16	16	20	17	15	19	17
min °C	13	8	8	9	8	9	13	9	13	19	10	13	19	11	13	18	9
chill °C	12	8	8	9	8	9	13	9	13	19	10	13	19	11	13	18	9

Freezing level m	2200	2200	2000	2200	2750	2500	3000	3300	3200	3250	3450	3450	3650	3650	3400	3400	3450
Cloud base (m)	1850	1750	600	500	2000	650	900	6700	5700	8750	9250	9250	8600		600	900	2100

	—	—	5:24	—	—	5:24	—	—	5:22	—	—	5:22	—	—	5:20	—	—
	—	8:39	—	—	8:42	—	—	8:43	—	—	8:44	—	—	8:45	—	—	8:45

Mount Si Weather (Days 0-3):

The weather forecast for Mount Si is: Mostly dry. Very mild (max 16°C on Thu morning, min 8°C on Mon night). Wind will be generally light.

Mount Si Weather (Days 3-6):

Mostly dry. Warm (max 20°C on Fri afternoon, min 9°C on Sat night). Wind will be generally light.

This table gives the weather forecast for Mount Si at the specific elevation of 500 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. 37 minutes ago	16° C	Dry	Calm (0 kph at 330).
Snoqualmie Pass 30 km ESE 824m alt. 35 minutes ago	14° C	-	Calm (3 kph at 264).
Renton 30 km WSW 160m alt. 39 minutes ago	19° C	Dry	Calm (2 kph at 335).
Black Diamond 32 km SSW 192m alt. 1 hour ago		-	Wind obs. (10 kph from 240 degs) was rejected.
Grotto wx 35 km NE 321m alt. 1 hour ago	17° C	Dry	Wind obs. (6 kph from 261 degs) was rejected.
Renton Airport 36 km WSW 218m alt. 2 hours ago	18° C	Dry and cloudy.	Light winds from the NNW (7 kph at 340).	16 km Low: overcast
Grotto wx 39 km NE 1101m alt. 41 minutes ago	8° C	Dry	Calm (0 kph at 215).
Auburn 39 km SW 119m alt. 1 hour ago		-	Calm (0 kph at 64).
Stampede Pass Airport 40 km SE 628m alt. 2 hours ago	10° C	Clear	Wind obs. (7 kph from 1 degs) was rejected.	16 km
Woodinville 43 km WNW 137.2m alt. 1 hour ago	16° C	Dry	Wind obs. (11 kph from 332 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.