– Lat/Long: 47.51° N 121.74° W

Mount Si
Weather Forecast, United States
Issued: 10 am Sat 09 May Local Time
Updates in:
hr min s
Update imminent

Issued: 10 am Sat 09 May 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 14°C on Mon night, min 5°C on Sun night). Wind will be generally light.									Days 4–6 Weather Summary Light rain (total 4mm), mostly falling on Thu night. Warm (max 20°C on Tue afternoon, min 2°C on Thu night). Winds increasing (calm on Tue night, fresh winds from the W by Thu afternoon).
	Saturday 9			Sunday 10			Monday 11			Tuesday 12			Wednesday 13			Thursday 14
	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night	AM	PM	night

	clear	cloudy	some clouds	cloudy	rain shwrs	rain shwrs	clear	clear	clear	some clouds	rain shwrs	rain shwrs	rain shwrs	rain shwrs	some clouds	some clouds	light rain	rain shwrs
km/h	N	WNW	SW	SW	WSW	N	NNE	NNE	ESE	ESE	S	SE	W	WSW	SSW	SW	W	WSW
See all weather maps
cm	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—
mm	—	—	—	—	0.1	0.2	—	—	—	—	0.1	0.1	0.1	0.7	—	—	0.1	3
max °C	8	11	12	9	10	6	7	11	14	16	20	18	13	13	10	4	7	4
min °C	7	10	9	8	8	5	6	10	13	15	19	14	12	12	4	3	5	2
chill °C	5	10	8	6	6	2	4	10	13	14	19	14	12	12	-1	-2	0	-2

Freezing level m	3400	3450	3300	2900	2400	2650	3250	3500	3750	3900	3850	3850	3650	3250	3050	2000	2050	1700
Cloud base (m)	8900	6500	6450	800	1850	1850	6600	7950	8800	6650	7000	6950	4000	3000	2650	1900	1650	450

	5:37	—	—	5:35	—	—	5:35	—	—	5:33	—	—	5:31	—	—	5:31	—	—
	—	—	8:29	—	—	8:30	—	—	8:30	—	—	8:32	—	—	8:34	—	—	8:35

Mount Si Weather (Days 0-3):

The weather forecast for Mount Si is: Mostly dry. Very mild (max 14°C on Mon night, min 5°C on Sun night). Wind will be generally light.

Mount Si Weather (Days 3-6):

Light rain (total 4mm), mostly falling on Thu night. Warm (max 20°C on Tue afternoon, min 2°C on Thu night). Winds increasing (calm on Tue night, fresh winds from the W by Thu afternoon).

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	18° C	Dry	Calm (0 kph at 93).
Renton 30 km WSW 160m alt. 1 hour ago	16° C	Dry	Calm (5 kph at 296).
Black Diamond 32 km SSW 192m alt. 34 minutes ago		-	Calm (5 kph at 28).
Grotto wx 35 km NE 321m alt. 2 hours ago	14° C	Dry	Calm (3 kph at 127).
Renton Airport 36 km WSW 218m alt. 2 hours ago	15° C	Clear	Light winds from the N (9 kph at 0).	16 km
Grotto wx 39 km NE 1101m alt. 2 hours ago	11° C	Dry	Calm (0 kph at 112).
Auburn 39 km SW 119m alt. 1 hour ago	29° C	Dry	Calm (0 kph at 309).
Stampede Pass Airport 40 km SE 628m alt. 2 hours ago	11° C	Clear	Calm (0 kph at 0).	16 km
SHIP10447 43 km W 15m alt. 3 hours ago				- km
SHIP4775 43 km W 3m alt. 3 hours ago	16° C

* 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.