– Lat/Long: 47.51° N 121.74° W

Mount Si
Weather Forecast, United States
Issued: 9 pm Mon 02 Feb Local Time
Updates in:
hr min s
Update imminent

Issued: 9 pm Mon 02 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 15°C on Thu morning, min 5°C on Mon night). Wind will be generally light.										Days 5–7 Weather Summary Moderate rain (total 19mm) heaviest on Sat night, then becoming colder with a dusting of snow on Sat night. Freeze-thaw conditions (max 11°C on Thu night, min 0°C on Sun afternoon). Winds increasing (light winds from the S on Thu night, strong winds from the SW by Sat night).
		Tuesday 3			Wednesday 4			Thursday 5			Friday 6			Saturday 7			Sunday 8
	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night

	rain shwrs	some clouds	some clouds	some clouds	some clouds	clear	clear	clear	clear	clear	some clouds	some clouds	light rain	light rain	light rain	light snow	light snow	cloudy	mod. snow
km/h	SW	S	SW	SW	SSE	SE	E	ESE	ESE	SW	SW	SW	SW	SW	SW	SW	SW	WSW	SW
See all weather maps
cm	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	1	1	—	6
mm	0.5	—	—	—	—	—	—	—	—	—	—	—	0.9	1.9	1.5	15	—	—	—
max °C	7	9	9	11	13	12	13	15	15	11	9	6	4	4	4	4	2	1	0
min °C	5	9	9	9	12	11	11	14	12	9	8	5	4	3	3	2	1	0	-2
chill °C	2	7	7	7	11	11	11	13	11	7	6	0	-1	-2	-2	-3	-2	-3	-9

Freezing level m	2700	2950	3050	3000	3600	3500	3700	3800	3800	3200	2700	2150	2050	1950	2000	2150	1500	1400	1200
Cloud base (m)	450	7150	5600	3000	5000	9250			8100	8800	8650	2900	650	500	950	450	450	450	400

	—	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 5°C on Mon night). Wind will be generally light.

Mount Si Weather (Days 3-6):

Moderate rain (total 19mm) heaviest on Sat night, then becoming colder with a dusting of snow on Sat night. Freeze-thaw conditions (max 11°C on Thu night, min 0°C on Sun afternoon). Winds increasing (light winds from the S on Thu night, strong winds from the SW by Sat 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. 2 hours ago	8° C	Dry	Calm (0 kph at 346).
Black Diamond 32 km SSW 192m alt. 1 hour ago	14° C	Dry	Calm (0 kph at 0).
Renton Airport 36 km WSW 218m alt. 2 hours ago	12° C	Dry and cloudy.	Calm (0 kph at 0).	16 km Low: overcast
Stampede Pass Airport 40 km SE 628m alt. 1 hour ago	3° C	Moderate rain .	Calm (0 kph at 0).	2 km Mid: few High: scattered
SHIP6197 43 km W 15m alt. 3 hours ago			Calm (2 kph at 160).	- km
SHIP2794 43 km W 15m alt. 3 hours ago			Calm (4 kph at 190).	- km
SHIP3847 43 km W 3m alt. 3 hours ago	13° C		Calm (2 kph at 160).
SHIP2964 43 km W 15m alt. 2 hours ago			Calm (2 kph at 330).	- km
SHIP6318 43 km W 15m alt. 3 hours ago			Calm (2 kph at 160).	- km
SHIP4600 43 km W 3m alt. 2 hours ago	13° C		Calm (2 kph at 170).

* 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.