Sunset on Cucamonga Peak north of Rancho Cucamonga

Weather · August

Rancho Cucamonga weather in August

Average highs of 95°F, lows of 65°F and 0.00 in of rain, from 30 years of weather records.

August is Rancho Cucamonga’s warmest month, with average highs of 95°F and lows of 65°F. That is 1° warmer than July, and 15° above the yearly average high.

Average high
95°F
Average low
65°F
Precipitation
0.00 in
Wet days
0
Sunrise · sunset
6:11 AM · 7:38 PM

August across the year

  1. 68°45°Jan
  2. 68°46°Feb
  3. 72°49°Mar
  4. 76°51°Apr
  5. 80°56°May
  6. 86°60°Jun
  7. 94°65°Jul
  8. 95°65°Aug
  9. 91°64°Sep
  10. 83°57°Oct
  11. 75°49°Nov
  12. 67°44°Dec

High and low Rain

What to wear in August

  • Hot days: light, breathable clothes, a sun hat, sunscreen and plenty of water for anything outdoors.

August is good for

  • Early-morning or evening outings, with indoor plans for the afternoon heat

Around Rancho Cucamonga

Ozel Jewelers, Rancho Cucamonga
Ozel Jewelers, Rancho CucamongaJordan W. · CC BY-SA 3.0
Chaffey library, Chaffey College, Rancho Cucamonga
Chaffey libraryUser:Plane777 · Public domain
Chaffey Town Square, Rancho Cucamonga
Chaffey Town SquareJordan W. · CC BY-SA 3.0

See Rancho Cucamonga

A look around town before you go.

A recorded drive through Rancho Cucamonga video thumbnail

A DRIVE AROUND TOWN

A recorded drive through Rancho Cucamonga

A recorded drive through Rancho Cucamonga offers a street-level introduction to the city. This film is a dated journey, not live road conditions.

Watch on YouTube ↗
My vlog: Discovering a beautiful mountain road in Rancho Cucamonga😄👍 video thumbnail

THINGS TO DO · YOUTUBE SHORT

My vlog: Discovering a beautiful mountain road in Rancho Cucamonga😄👍

An activity Short shared by XiaomeiCheckIn.

Watch on YouTube ↗

August compared with the months around it

MonthHighLowRain
July94°F65°F0.10 in
August95°F65°F0.00 in
September91°F64°F0.10 in

Planning a trip? See the best time to visit Rancho Cucamonga and today’s forecast.

Questions

How hot does it get in Rancho Cucamonga in August?

Average highs are 95°F and average lows 65°F, for a daily mean of 80°F. Individual days run hotter or colder than these 30-year averages.

Does it rain in Rancho Cucamonga in August?

August averages 0.00 in of precipitation over about 0 days with at least 0.01 in. It is the 12th wettest month of the year.

What time is sunset in Rancho Cucamonga in August?

Around mid-August the sun rises about 6:11 AM and sets about 7:38 PM, for roughly 13.4 hours of daylight.

Is August a good time to visit Rancho Cucamonga?

The mildest months for visiting are April, May, October. August is hot.

NOAA U.S. Climate Normals 1991–2020, Ontario Intl Ap station (3.5 mi from downtown). Sunrise and sunset are calculated for August 15 at the city’s coordinates.

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