– Lat/Long: 47.51° N 121.74° W

Mount Si Weather Forecast

Cascade Range · United States

Issued: 4 am Sun 27 Sep Local Time

Updates in:

hr min s

Update imminent

Issued: 4 am Sun 27 Sep Local Time

Updates in:

hr min s

Update imminent

2 Mount Si Elevations: 2 Forecast Elevations:

	Days 1–3 Weather Summary Moderate rain (total 15mm), heaviest on Tue afternoon. Very mild (max 16°C on Sun afternoon, min 7°C on Tue night). Wind will be generally light.									Days 4–6 Weather Summary Mostly dry. Warm (max 22°C on Fri afternoon, min 6°C on Wed morning). Wind will be generally light.
	Sunday 27			Monday 28			Tuesday 29			Wednesday 30			Thursday 1			Friday 2
	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night

	cloudy	clear	clear	some clouds	clear	some clouds	light rain	mod. rain	rain shwrs	clear	clear	clear	clear	clear	some clouds	some clouds	clear	clear
Cloud base (m)	5800			6000	3200	2600	650	400	800		8850				7250	8250		9000
km/h	ENE	NW	ENE	WNW	WSW	SW	SW	WSW	NNW	NW	NNW	ESE	NE	ENE	ESE	S	W	S
See all weather maps
cm	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—
mm	—	—	—	—	—	—	1.5	8	5	—	—	—	—	—	—	—	—	—
max °C	14	16	11	13	15	11	12	13	12	11	14	10	17	20	15	20	22	15
min °C	9	16	9	9	15	10	12	12	7	6	14	10	11	20	14	15	20	11
chill °C	8	16	9	9	15	9	10	10	6	6	14	10	11	20	13	15	20	11

Freezing level m	2800	2900	2950	2850	2850	3350	3050	3100	2500	2600	3200	3600	3850	4050	4050	4000	3600	4000

	6:58	—	—	7:01	—	—	7:01	—	—	7:03	—	—	7:05	—	—	7:05	—	—
	—	6:54	—	—	6:52	—	—	6:51	—	—	6:49	—	—	6:46	—	—	6:45	—

Mount Si Weather (Days 0-3):

The weather forecast for Mount Si is: Moderate rain (total 15mm), heaviest on Tue afternoon. Very mild (max 16°C on Sun afternoon, min 7°C on Tue night). Wind will be generally light.

Mount Si Weather (Days 3-6):

Mostly dry. Warm (max 22°C on Fri afternoon, min 6°C on Wed morning). Wind will be generally light.

This table gives the weather forecast for Mount Si at the specific elevation of 500 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. 57 minutes ago	6°C	Dry	Calm (0 kph at 344).
Renton 30 km WSW 160m alt. 1 hour ago	8°C	Dry	Calm (2 kph at 20).
Black Diamond 32 km SSW 192m alt. 57 minutes ago	21°C	Dry	Calm (0 kph at 0).
Renton Airport 36 km WSW 716m alt. 2 hours ago	11°C	Clear	Light winds from the N (15 kph at 0).	16 km
Auburn 39 km SW 119m alt. 1 hour ago	12°C	Dry	Calm (0 kph at 231).
Monroe 44 km NW 80m alt. 27 minutes ago	28°C	Dry	Calm (0 kph at 67).
Seattle Tacoma International Airport 44 km WSW 716m alt. 2 hours ago	10°C	Dry and cloudy.	Light winds from the NNE (17 kph at 20).	16 km Low: overcast
Seattl / oeing Airport 44 km WSW 716m alt. 2 hours ago	11°C	Clear	Light winds from the NNW (6 kph at 340).	16 km
BUOY-EBSW1 46 km W 3m alt. 59 minutes ago
Snohomish 49 km NW 196m alt. 49 minutes ago	7°C	Dry	Calm (5 kph at 9).

* 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.