– Lat/Long: 47.51° N 121.74° W

Mount Si
Weather Forecast, United States
Issued: 9 pm Tue 03 Feb Local Time
Updates in:
hr min s
Update imminent

Issued: 9 pm Tue 03 Feb 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 6°C on Fri afternoon). Wind will be generally light.										Days 5–7 Weather Summary Heavy rain (total 38mm) on Sat night. Becoming colder with heavy fall of snow, heaviest during Sun afternoon. Freeze-thaw conditions (max 5°C on Fri night, min -2°C on Sun afternoon). Winds decreasing (strong winds from the SW on Sat morning, calm by Mon afternoon).
		Wednesday 4			Thursday 5			Friday 6			Saturday 7			Sunday 8			Monday 9
	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night

	some clouds	some clouds	clear	clear	some clouds	clear	clear	some clouds	cloudy	rain shwrs	light rain	light rain	heavy rain	mod. snow	mod. snow	mod. snow	light snow	some clouds	cloudy
km/h	S	SE	SSE	ESE	ESE	SE	SW	SW	WSW	SW	SSW	SSW	SSW	SW	NNW	SW	SW	WNW	N
See all weather maps
cm	—	—	—	—	—	—	—	—	—	—	—	—	—	8	8	6	1	—	—
mm	—	—	—	—	—	—	—	—	—	0.1	4	4	30	—	—	—	—	—	—
max °C	12	14	13	14	16	15	11	9	7	5	5	5	5	1	-1	-1	-1	-1	2
min °C	9	13	12	12	14	12	9	8	6	4	4	5	3	0	-2	-2	-2	-1	-2
chill °C	8	13	12	12	13	11	7	5	3	0	-2	-1	-2	-6	-6	-9	-7	-3	-2

Freezing level m	3000	3550	3500	3750	3800	3800	3150	2800	2400	2000	2150	2300	2200	1450	950	1000	1050	1150	1050
Cloud base (m)	2800	4600	8000			8200	9350	8450	5950	2000	700	400	400	400	450	450	450	500	650

	—	7:28	—	—	7:26	—	—	7:26	—	—	7:24	—	—	7:22	—	—	7:20	—	—
	—	—	5:13	—	—	5:14	—	—	5:15	—	—	5:17	—	—	5:19	—	—	5:21	—

Mount Si Weather (Days 0-3):

The weather forecast for Mount Si is: Mostly dry. Very mild (max 16°C on Thu morning, min 6°C on Fri afternoon). Wind will be generally light.

Mount Si Weather (Days 3-6):

Heavy rain (total 38mm) on Sat night. Becoming colder with heavy fall of snow, heaviest during Sun afternoon. Freeze-thaw conditions (max 5°C on Fri night, min -2°C on Sun afternoon). Winds decreasing (strong winds from the SW on Sat morning, calm by Mon 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
Harman Heights wx 6 km SSW 251m alt. 39 minutes ago	11° C	Dry	Calm (0 kph at 6).
Black Diamond 32 km SSW 192m alt. 1 hour ago	12° C	Dry	Calm (0 kph at 0).
Renton Airport 36 km WSW 218m alt. 2 hours ago	10° C	-	Light winds from the NNW (9 kph at 340).	16 km Low: few
Stampede Pass Airport 40 km SE 628m alt. 1 hour ago	1° C	Light rain .	Calm (0 kph at 0).	1 km
SHIP3717 43 km W 3m alt. 2 hours ago	11° C		Light winds from the S (8 kph at 190).
SHIP5548 43 km W 15m alt. 2 hours ago			Light winds from the S (8 kph at 190).	- km
SHIP3608 43 km W 15m alt. 3 hours ago			Calm (4 kph at 230).	- km
SHIP2380 43 km W 3m alt. 3 hours ago	11° C		Calm (2 kph at 330).
SHIP5947 43 km W 15m alt. 3 hours ago			Calm (2 kph at 330).	- km
SHIP5293 43 km W 15m alt. 2 hours ago			Light winds from the SSW (8 kph at 200).	- 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.