What is the hottest month in Harrison, ID?

August is the warmest month, with a normal high of 83°F at Plummer 3 Wsw.

What is the coldest month in Harrison, ID?

December is the coldest month, with a normal low of 23°F.

What is the wettest month in Harrison, ID?

January has the most precipitation on average, about 3.79 inches.

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Checked Oct 25, 2026

Harrison, ID Climate

1991 to 2020 normals at Plummer 3 Wsw, 13 mi from the center of Harrison, elevation 2905 ft.

Average weather by month

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

Month	High	Low	Precip.	Snow
January	37°	24°	3.79 in	--
February	40°	25°	2.57 in	--
March	47°	29°	3.59 in	--
April	55°	34°	2.34 in	--
May	65°	41°	2.46 in	--
June	70°	45°	1.90 in	--
July	81°	52°	0.71 in	--
August	83°	51°	0.74 in	--
September	73°	44°	1.02 in	--
October	57°	36°	2.50 in	--
November	43°	30°	3.55 in	--
December	35°	23°	3.35 in	--
Year	57°		28.52 in	--

Frequently asked questions

What is the hottest month in Harrison, ID?: August is the warmest month, with a normal high of 83°F at Plummer 3 Wsw.
What is the coldest month in Harrison, ID?: December is the coldest month, with a normal low of 23°F.
What is the wettest month in Harrison, ID?: January has the most precipitation on average, about 3.79 inches.

Today

Harrison, ID 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

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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.

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