– Lat/Long: 47.51° N 121.74° W

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

Issued: 9 am Tue 03 Feb 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 15°C on Thu morning, min 8°C on Tue afternoon). Wind will be generally light.									Days 4–6 Weather Summary Moderate rain (total 15mm) on Sat night. Becoming colder with heavy fall of snow, heaviest during Sat night. Freeze-thaw conditions (max 9°C on Fri morning, min -2°C on Sun night). Winds increasing (light winds from the SW on Sun morning, strong winds from the WSW by Sun night).
	Tuesday 3			Wednesday 4			Thursday 5			Friday 6			Saturday 7			Sunday 8
	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night

	some clouds	some clouds	some clouds	some clouds	clear	clear	some clouds	clear	clear	some clouds	rain shwrs	light rain	light rain	light rain	light snow	light snow	light snow	mod. snow
km/h	S	SW	SSW	SSE	SE	ESE	ESE	ESE	SW	SW	SW	SW	SW	SW	SSW	SW	NW	WSW
See all weather maps
cm	—	—	—	—	—	—	—	—	—	—	—	—	—	—	5	5	5	8
mm	—	—	—	—	—	—	—	—	—	—	0.1	0.8	2	0.6	12	—	—	—
max °C	10	9	11	14	13	13	15	14	11	9	6	4	5	5	4	1	0	-1
min °C	9	8	8	12	12	12	15	11	8	7	5	4	5	5	1	0	-1	-2
chill °C	7	6	6	11	12	12	14	10	6	4	1	0	-1	-1	-2	-4	-7	-10

Freezing level m	2950	2950	3000	3500	3550	3700	3850	3750	3100	2600	2150	2000	2200	2050	2100	1350	1200	1050
Cloud base (m)	7150	5900	2400	4650	8150				9350		2800	750	500	700	400	400	400	450

	7:30	—	—	7:28	—	—	7:26	—	—	7:26	—	—	7:24	—	—	7:22	—	—
	—	5:10	—	—	5:13	—	—	5:14	—	—	5:15	—	—	5:17	—	—	5:19	—

Mount Si Weather (Days 0-3):

The weather forecast for Mount Si is: Mostly dry. Very mild (max 15°C on Thu morning, min 8°C on Tue afternoon). Wind will be generally light.

Mount Si Weather (Days 3-6):

Moderate rain (total 15mm) on Sat night. Becoming colder with heavy fall of snow, heaviest during Sat night. Freeze-thaw conditions (max 9°C on Fri morning, min -2°C on Sun night). Winds increasing (light winds from the SW on Sun morning, strong winds from the WSW 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. 50 minutes ago	11° C	Dry	Calm (0 kph at 341).
Black Diamond 32 km SSW 192m alt. 46 minutes ago	23° C	Dry	Calm (5 kph at 0).
Renton Airport 36 km WSW 218m alt. 2 hours ago	9° C	Mist -.	Calm (0 kph at 0).	10 km Low: few
Auburn 39 km SW 119m alt. 48 minutes ago	16° C	Dry	Calm (3 kph at 210).
Stampede Pass Airport 40 km SE 628m alt. 2 hours ago	1° C	-	Wind obs. (6 kph from 1 degs) was rejected.	0.0 km
SHIP7855 43 km W 15m alt. 3 hours ago			Calm (4 kph at 130).	- km
SHIP3947 43 km W 15m alt. 3 hours ago			Calm (4 kph at 130).	- km
SHIP4291 43 km W 15m alt. 1 hour ago			Calm (2 kph at 200).	- km
SHIP9794 43 km W 15m alt. 3 hours ago			Calm (4 kph at 130).	- km
SHIP8329 43 km W 3m alt. 3 hours ago	12° C		Calm (4 kph at 130).

* 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.