– Lat/Long: 47.51° N 121.74° W

Mount Si
Weather Forecast, United States
Issued: 4 pm Mon 20 Apr Local Time
Updates in:
hr min s
Update imminent

Issued: 4 pm Mon 20 Apr Local Time

Updates in:

hr min s

Update imminent

2 Mount Si Elevations: 2 Forecast Elevations:

	Days 1–4 Weather Summary Mild at first with light rain (total 4mm) on Tue night followed by colder weather and light fall of snow, heaviest on Tue night. Freeze-thaw conditions (max 16°C on Mon afternoon, min -1°C on Wed night). Winds increasing (calm on Mon night, strong winds from the SW by Wed morning).											Days 5–7 Weather Summary Mostly dry. Freeze-thaw conditions (max 8°C on Sat afternoon, min 0°C on Thu afternoon). Wind will be generally light.
	Mon 20		Tuesday 21			Wednesday 22			Thursday 23			Friday 24			Saturday 25
	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night

	cloudy	rain shwrs	cloudy	light rain	light snow	mod. snow	light snow	light snow	cloudy	some clouds	clear	clear	clear	some clouds	some clouds	rain shwrs	rain shwrs
km/h	W	NNE	SW	WSW	WSW	SW	SW	SW	W	NNW	N	NE	NNW	WNW	NW	NW	SE
See all weather maps
cm	—	—	—	—	4	7	3	1	—	—	—	—	—	—	—	—	—
mm	—	0.1	—	0.3	3	—	—	—	—	—	—	—	—	—	—	0.2	0.2
max °C	16	11	8	5	4	1	2	0	0	1	3	5	7	6	6	8	7
min °C	14	9	5	4	1	1	2	-1	-1	0	2	4	6	5	6	7	6
chill °C	13	8	3	1	-4	-6	-4	-7	-6	-3	0	1	4	4	5	4	6

Freezing level m	3000	3100	2950	2400	1850	1500	1600	1050	1300	1450	1850	1900	2150	2150	2150	2250	2200
Cloud base (m)	3450	4900	800	650	400	400	400	400	450	500			2350		3000	2350	4400

	—	—	6:07	—	—	6:05	—	—	6:03	—	—	6:01	—	—	6:00	—	—
	—	8:02	—	—	8:04	—	—	8:05	—	—	8:07	—	—	8:07	—	—	8:09

Mount Si Weather (Days 0-3):

The weather forecast for Mount Si is: Mild at first with light rain (total 4mm) on Tue night followed by colder weather and light fall of snow, heaviest on Tue night. Freeze-thaw conditions (max 16°C on Mon afternoon, min -1°C on Wed night). Winds increasing (calm on Mon night, strong winds from the SW by Wed morning).

Mount Si Weather (Days 3-6):

Mostly dry. Freeze-thaw conditions (max 8°C on Sat afternoon, min 0°C on Thu afternoon). Wind will be generally light.

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. 1 hour ago	14° C	Dry	Calm (0 kph at 334).
Snoqualmie Pass 30 km ESE 824m alt. 1 hour ago	6° C	-	Calm (0 kph at 353).
Renton 30 km WSW 160m alt. 54 minutes ago	17° C	Dry	Calm (0 kph at 167).
Grotto wx 35 km NE 321m alt. 49 minutes ago	16° C	Dry	Calm (0 kph at 308).
Renton Airport 36 km WSW 218m alt. 3 hours ago	21° C	Dry and partly cloudy.	Light winds from the S (6 kph at 170).	16 km Low: scattered
Grotto wx 39 km NE 1101m alt. 53 minutes ago	6° C	Dry	Calm (0 kph at 341).
Auburn 39 km SW 119m alt. 1 hour ago	16° C	Dry	Calm (0 kph at 195).
Stampede Pass Airport 40 km SE 628m alt. 3 hours ago	11° C	Dry and partly cloudy.	Wind obs. (6 kph from 1 degs) was rejected.	16 km Low: few Mid: scattered
Woodinville 43 km WNW 137.2m alt. 1 hour ago	15° C	Dry	Wind obs. (8 kph from 353 degs) was rejected.
Seattl / oeing Airport 44 km WSW 218m alt. 3 hours ago	21° C	Dry and partly cloudy.	Calm (0 kph at 0).	16 km Low: broken Mid: broken

* 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.