– Lat/Long: 47.51° N 121.74° W

Mount Si
Weather Forecast, United States
Issued: 10 am Mon 17 Aug Local Time
Updates in:
hr min s
Update imminent

Issued: 10 am Mon 17 Aug Local Time

Updates in:

hr min s

Update imminent

2 Mount Si Elevations: 2 Forecast Elevations:

	Days 1–3 Weather Summary Mostly dry. Very mild (max 17°C on Mon afternoon, min 12°C on Tue night). Wind will be generally light.									Days 4–6 Weather Summary Some drizzle, heaviest during Fri night. Warm (max 24°C on Fri afternoon, min 9°C on Sat night). Winds increasing (calm on Thu night, fresh winds from the SW by Fri afternoon).
	Monday 17			Tuesday 18			Wednesday 19			Thursday 20			Friday 21			Saturday 22
	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night

	clear	clear	some clouds	some clouds	clear	clear	clear	clear	clear	clear	clear	clear	some clouds	cloudy	light rain	rain shwrs	rain shwrs	some clouds
Cloud base (m)	550			6650	9350			9350					4600	3350		450	650	900
km/h	SSW	WNW	NW	WSW	WSW	NW	W	W	WNW	SW	WNW	WSW	S	SW	SW	SW	SW	NNW
See all weather maps
cm	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—
mm	—	—	—	—	—	—	—	—	—	—	—	—	—	—	1	0.1	0.1	—
max °C	16	17	16	14	17	15	14	16	15	17	19	20	21	24	19	12	10	10
min °C	14	16	14	13	15	12	13	15	14	15	18	19	21	21	14	11	10	9
chill °C	14	16	14	13	15	12	13	15	14	15	18	19	21	21	13	9	8	8

Freezing level m	4100	4150	4100	4250	4250	4350	4300	4300	4350	4350	4500	4700	4550	4300	4100	3550	3700	3900

	6:05	—	—	6:05	—	—	6:07	—	—	6:09	—	—	6:09	—	—	6:11	—	—
	—	—	8:15	—	—	8:14	—	—	8:12	—	—	8:09	—	—	8:07	—	—	8:07

Mount Si Weather (Days 0-3):

The weather forecast for Mount Si is: Mostly dry. Very mild (max 17°C on Mon afternoon, min 12°C on Tue night). Wind will be generally light.

Mount Si Weather (Days 3-6):

Some drizzle, heaviest during Fri night. Warm (max 24°C on Fri afternoon, min 9°C on Sat night). Winds increasing (calm on Thu night, fresh winds from the SW by Fri afternoon).

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
Renton 30 km WSW 160m alt. 1 hour ago	23° C	Dry	Calm (5 kph at 212).
Black Diamond 32 km SSW 192m alt. 1 hour ago		-	Calm (5 kph at 119).
Renton Airport 36 km WSW 218m alt. 2 hours ago	22° C	Clear	Light winds from the NNW (17 kph at 340).	16 km
Auburn 39 km SW 119m alt. 2 hours ago	37° C	Dry	Calm (0 kph at 93).
SHIP9698 42 km WSW 3m alt. 3 hours ago
SHIP10743 42 km WSW 15m alt. 3 hours ago				- km
SHIP9312 42 km WSW 3m alt. 3 hours ago
SHIP9933 42 km WSW 3m alt. 2 hours ago
SHIP4588 42 km WSW 15m alt. 2 hours ago				- km
SHIP6526 42 km WSW 3m alt. 2 hours ago

* 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.