Go Back
  • For Business
  • |
  • Warnings
  • Data Suite
  • Forensics
  • Advertising
  • Superior Accuracy™
Fall allergy season is underway. See where the worst pollen levels are expected. Chevron right
Hawaii on alert for new tropical rainstorm. Click for the track forecast. Chevron right

Rancho Cucamonga, CA

79°F
Location Chevron down
Location News Videos
Use Current Location
Recent

Rancho Cucamonga

California

79°
No results found.
Try searching for a city, zip code or point of interest.
Get Premium+
Create Your Account Unlock extended daily and hourly forecasts — all with your free account.
Let's Go Chevron right
Have an account already? Log In
settings
Help
Rancho Cucamonga, CA Weather
Today WinterCast Local {stormName} Tracker Hourly 10-Day Radar MinuteCast® Monthly Air Quality Health & Activities

Around the Globe

Hurricane Tracker

Severe Weather

Radar & Maps
News

News & Features

Astronomy

Business

Climate

Health

Recreation

Sports

Travel
For Business

Warnings

Data Suite

Forensics

Advertising

Superior Accuracy™

Video

Winter Center
Today Hourly 10-Day Radar MinuteCast® Monthly Air Quality Health & Activities
Thursday, August 20

Day

8/20
100°Hi
RealFeel® 102°
Very Hot
RealFeel Guide
Very Hot
101° to 107°
Caution advised. Danger of dehydration, heat stroke, heat exhaustion and heat cramps if outside for extended periods, and especially while doing strenuous activities.
LEARN MORE
RealFeel Shade™ 97°
Hot
RealFeel Guide
Hot
90° to 100°
Caution advised. Possible danger of dehydration, heat stroke, heat exhaustion and heat cramps if outside for extended periods, and especially while doing strenuous activities.
LEARN MORE
Partly sunny and hot; caution advised if outside for extended periods of time
alerts

Heat Advisory

10:00 AM Wednesday - 8:00 PM Thursday

Max UV Index10.0 (Very High)

AccuLumen Brightness Index™9 (Very Bright)

WindSW 8 mph

Wind Gusts18 mph

Probability of Precipitation0%

Probability of Thunderstorms0%

Precipitation0.00 in

Cloud Cover27%

Morning

Afternoon

Night

8/20
69°Lo
RealFeel® 68°
Pleasant
RealFeel Guide
Pleasant
63° to 81°
Most consider this temperature range ideal.
LEARN MORE
Mainly clear
alerts

Heat Advisory

10:00 AM Wednesday - 8:00 PM Thursday

WindWSW 5 mph

Wind Gusts9 mph

Probability of Precipitation0%

Probability of Thunderstorms0%

Precipitation0.00 in

Cloud Cover13%

Evening

Overnight

Sun & Moon

13 hrs 17 mins
Rise 6:15 AM
Set 7:32 PM
Waxing Gibbous
Rise 2:27 PM
Set 12:05 AM

Temperature History

8/20
High
Low
Forecast
100°
69°
Average
95°
65°
Last Year
99°
68°
Record
107°
1969
52°
1978

Further Ahead

Hourly

10-Day

Monthly

Around the Globe

Hurricane Tracker

Severe Weather

Radar & Maps

News

Video

Winter Center

Top Stories

Weather Forecasts

Fall allergy forecast: Weed, grass pollen to surge in parts of US

9 hours ago

Hurricane

New tropical rainstorm is tracking toward Hawaii a week after Lala

6 hours ago

Hurricane

Atlantic hurricane forecast changes as peak season approaches

14 hours ago

Weather News

Lala leaves Hawaii communities buried in mud, communication cut off

15 hours ago

Weather News

New heat dome to build in western U.S., further exacerbating drought

20 hours ago

 More Stories

Featured Stories

Recreation

250-pound black bear dies after becoming trapped in Colorado car

10 hours ago

Climate

Warmer ocean waters draw more sharks to Southern California

1 day ago

Climate

Lake Powell sinks to record low as Colorado River crisis deepens

1 day ago

Recreation

American tourist dies after lightning strike on Mount Etna

1 day ago

Travel

Engine fan blade caused passenger to be partially sucked out window

1 day ago
World North America United States California Rancho Cucamonga

Weather Near Rancho Cucamonga:

  • Anaheim, CA
  • Long Beach, CA
  • Los Angeles, CA
Company
Proven Superior Accuracy™ About AccuWeather Digital Advertising Careers Press Contact Us
Products & Services
For Business For Partners For Advertising AccuWeather APIs AccuWeather Connect Personal Weather Stations
Apps & Downloads
iPhone App Android App See all Apps & Downloads
Subscription Services
AccuWeather Premium AccuWeather Professional
More
AccuWeather Ready Business Health Hurricane Leisure and Recreation Severe Weather Space and Astronomy Sports Travel Weather News Winter Center
Company
Proven Superior Accuracy™ About AccuWeather Digital Advertising Careers Press Contact Us
Products & Services
For Business For Partners For Advertising AccuWeather APIs AccuWeather Connect Personal Weather Stations
Apps & Downloads
iPhone App Android App See all Apps & Downloads
Subscription Services
AccuWeather Premium AccuWeather Professional
More
AccuWeather Ready Business Health Hurricane Leisure and Recreation Severe Weather Space and Astronomy Sports Travel Weather News Winter Center
© 2026 AccuWeather, Inc. "AccuWeather" and sun design are registered trademarks of AccuWeather, Inc. All Rights Reserved.
Terms of Use | Privacy Policy | Cookie Policy | About Your Privacy Do Not Sell or Share My Personal Information | Data Sources

...

...

...