– Lat/Long: 47.51° N 121.74° W

Mount Si
Weather Forecast, United States
Issued: 10 pm Sun 10 May Local Time
Updates in:
hr min s
Update imminent

Issued: 10 pm Sun 10 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 19°C on Tue afternoon, min 5°C on Sun night). Wind will be generally light.										Days 5–7 Weather Summary Light rain (total 6mm) at first, then becoming colder with a dusting of snow on Fri afternoon. Freeze-thaw conditions (max 8°C on Thu afternoon, min -2°C on Sat morning). Winds decreasing (strong winds from the WSW on Fri afternoon, light winds from the WSW by Sat morning).
		Monday 11			Tuesday 12			Wednesday 13			Thursday 14			Friday 15			Saturday 16
	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night

	rain shwrs	clear	clear	clear	some clouds	clear	some clouds	light rain	some clouds	rain shwrs	light rain	rain shwrs	rain shwrs	light rain	snow shwrs	snow shwrs	some clouds	snow shwrs	rain shwrs
km/h	WNW	NNE	N	ESE	ESE	WSW	W	WSW	W	SW	SW	WSW	SW	SW	WSW	WSW	WSW	NW	NNW
See all weather maps
cm	—	—	—	—	—	—	—	—	—	—	—	—	—	—	1	2	—	1	—
mm	0.4	—	—	—	—	—	—	0.1	—	0.1	0.5	0.1	0.1	3	1.9	—	—	0.7	0.1
max °C	6	7	11	14	16	19	16	10	10	7	2	8	6	2	3	1	0	4	2
min °C	5	6	10	13	15	17	10	10	8	2	2	4	1	2	1	-1	-2	2	0
chill °C	3	4	10	13	14	17	10	10	6	-3	-4	1	-4	-3	-6	-8	-8	-2	-4

Freezing level m	2400	3250	3500	3800	3850	3850	3650	3250	2900	2200	1800	2400	2000	1600	1600	1100	1200	1700	1450
Cloud base (m)	750		9250	8950	6800	8900	5400		2450	2150	450	850	2150	500	500	600	500	1700

	—	5:35	—	—	5:33	—	—	5:31	—	—	5:31	—	—	5:30	—	—	5:28	—	—
	—	—	—	8:30	—	—	8:32	—	—	8:34	—	—	8:35	—	—	8:37	—	—	8:37

Mount Si Weather (Days 0-3):

The weather forecast for Mount Si is: Mostly dry. Very mild (max 19°C on Tue afternoon, min 5°C on Sun night). Wind will be generally light.

Mount Si Weather (Days 3-6):

Light rain (total 6mm) at first, then becoming colder with a dusting of snow on Fri afternoon. Freeze-thaw conditions (max 8°C on Thu afternoon, min -2°C on Sat morning). Winds decreasing (strong winds from the WSW on Fri afternoon, light winds from the WSW by Sat morning).

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	13° C	Dry	Calm (0 kph at 322).
Renton 30 km WSW 160m alt. 1 hour ago	11° C	Dry	Calm (0 kph at 39).
Black Diamond 32 km SSW 192m alt. 3 hours ago		-	Calm (3 kph at 0).
Grotto wx 35 km NE 321m alt. 1 hour ago	10° C	Dry	Calm (0 kph at 89).
Renton Airport 36 km WSW 218m alt. 2 hours ago		Dry and partly cloudy.	Calm (0 kph at 0).	16 km Low: broken
Grotto wx 39 km NE 1101m alt. 36 minutes ago	3° C	Dry	Calm (0 kph at 12).
Auburn 39 km SW 119m alt. 32 minutes ago	12° C	Dry	Calm (0 kph at 97).
Stampede Pass Airport 40 km SE 628m alt. 2 hours ago	5° C	Mist -.	Light winds from the N (6 kph at 1).	10 km Low: overcast
Woodinville 43 km WNW 137.2m alt. 3 hours ago	11° C	Dry	Wind obs. (6 kph from 253 degs) was rejected.
Seattl / oeing Airport 44 km WSW 218m alt. 2 hours ago	13° C	-	Calm (0 kph at 0).	16 km Low: few

* 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.