What is the hottest month in Sultan, WA?

August is the warmest month, with a normal high of 78°F at Startup 1 E.

What is the coldest month in Sultan, WA?

December is the coldest month, with a normal low of 34°F.

What is the wettest month in Sultan, WA?

November has the most precipitation on average, about 9.82 inches.

Checked Oct 25, 2026

Sultan, WA Climate

1991 to 2020 normals at Startup 1 E, 3.9 mi from the center of Sultan, elevation 170 ft.

Average weather by month

Select a month for daily normals and last year's weather

Month	High	Low	Precip.	Snow
January	47°	34°	8.94 in	--
February	51°	34°	5.92 in	--
March	55°	36°	6.77 in	--
April	60°	39°	5.87 in	--
May	67°	44°	4.95 in	--
June	71°	49°	3.84 in	--
July	78°	52°	1.48 in	--
August	78°	51°	1.70 in	--
September	73°	47°	3.49 in	--
October	62°	42°	7.13 in	--
November	52°	37°	9.82 in	--
December	47°	34°	8.41 in	--
Year	62°		68.32 in	--

Frequently asked questions

What is the hottest month in Sultan, WA?: August is the warmest month, with a normal high of 78°F at Startup 1 E.
What is the coldest month in Sultan, WA?: December is the coldest month, with a normal low of 34°F.
What is the wettest month in Sultan, WA?: November has the most precipitation on average, about 9.82 inches.

Today

Sultan, WA forecast

Data sources

U.S. Climate Normals 1991-2020NOAA National Centers for Environmental Information · Official site
U.S. Climate Normals 1991-2020 (daily) and GHCN-Daily via Access Data ServiceNOAA National Centers for Environmental Information · Official site

See something wrong? Request a correction

About this data

Weather and emergencies: Weather, air quality and hazard information on this page is delayed and may be incomplete. It is not a substitute for official warnings. Always follow the National Weather Service, local emergency management and public safety officials. In an emergency, call 911. For evacuation orders, use your local official alert system.

Climate normals are 30-year averages measured at one weather station, which may be miles from the place named here or at a different elevation.

DatenUS is a private website and is not affiliated with or endorsed by any government agency. We republish public data from the sources listed on this page. Data can be incomplete, delayed or wrong. Always check the original source before you make a decision.

Our servers read this data automatically from government sources. Errors can come from the source itself or from the way we read, process or display it, and we do not guarantee that it is accurate, complete or current. Verify anything important with the official source.

Report an error Read the full disclaimer