What is the hottest month in Rainbow, CA?

August is the warmest month, with a normal high of 89°F at Fallbrook 5 NE.

What is the coldest month in Rainbow, CA?

December is the coldest month, with a normal low of 46°F.

What is the wettest month in Rainbow, CA?

February has the most precipitation on average, about 3.74 inches.

Checked Oct 25, 2026

Rainbow, CA Climate

1991 to 2020 normals at Fallbrook 5 NE, 3.8 mi from the center of Rainbow, elevation 1140 ft.

Average weather by month

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

Month	High	Low	Precip.	Snow
January	68°	47°	3.17 in	--
February	67°	46°	3.74 in	--
March	70°	48°	2.02 in	--
April	72°	51°	1.00 in	--
May	75°	53°	0.36 in	--
June	81°	56°	0.12 in	--
July	87°	60°	0.08 in	--
August	89°	62°	0.22 in	--
September	88°	62°	0.11 in	--
October	83°	58°	0.70 in	--
November	74°	52°	1.15 in	--
December	67°	46°	2.64 in	--
Year	77°		15.31 in	--

Frequently asked questions

What is the hottest month in Rainbow, CA?: August is the warmest month, with a normal high of 89°F at Fallbrook 5 NE.
What is the coldest month in Rainbow, CA?: December is the coldest month, with a normal low of 46°F.
What is the wettest month in Rainbow, CA?: February has the most precipitation on average, about 3.74 inches.

Today

Rainbow, CA forecast

Data sources

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

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About this data

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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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