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Diamond Bar, CA

80°F
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Diamond Bar

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Diamond Bar, CA Weather
Today WinterCast Local {stormName} Tracker Hourly 10-Day Radar MinuteCast® Monthly Air Quality Health & Activities

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1 PM

82°
RealFeel® 89°
Very Warm
RealFeel Guide
Very Warm
82° to 89°
Older adults, infants, and those with sensitive medical conditions should minimize outdoor activity, especially in the sunshine.
LEARN MORE
rain drop 0%
Chevron down
Sunny

RealFeel Shade™79°

Heat Index82°

WindWSW 9 mph

Air QualityPoor

Max UV Index11.7 (Extreme)

Wind Gusts16 mph

Humidity43%

Indoor Humidity43% (Slightly Humid)

Dew Point58° F

AccuLumen Brightness Index™9 (Very Bright)

Cloud Cover6%

Visibility10 mi

Cloud Ceiling33300 ft

2 PM

85°
RealFeel® 91°
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
rain drop 0%
Chevron down
Mostly sunny

RealFeel Shade™81°

Heat Index84°

WindWSW 10 mph

Air QualityPoor

Max UV Index10.9 (Extreme)

Wind Gusts20 mph

Humidity38%

Indoor Humidity38% (Slightly Humid)

Dew Point56° F

AccuLumen Brightness Index™9 (Very Bright)

Cloud Cover11%

Visibility10 mi

Cloud Ceiling30000 ft

3 PM

87°
RealFeel® 91°
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
rain drop 0%
Chevron down
Mostly sunny

RealFeel Shade™84°

Heat Index85°

WindWSW 10 mph

Air QualityPoor

Max UV Index8.1 (Very High)

Wind Gusts21 mph

Humidity35%

Indoor Humidity35% (Slightly Humid)

Dew Point56° F

AccuLumen Brightness Index™9 (Very Bright)

Cloud Cover11%

Visibility10 mi

Cloud Ceiling30000 ft

4 PM

86°
RealFeel® 88°
Very Warm
RealFeel Guide
Very Warm
82° to 89°
Older adults, infants, and those with sensitive medical conditions should minimize outdoor activity, especially in the sunshine.
LEARN MORE
rain drop 0%
Chevron down
Mostly sunny

RealFeel Shade™83°

Heat Index84°

WindWSW 10 mph

Air QualityPoor

Max UV Index5.0 (Moderate)

Wind Gusts22 mph

Humidity36%

Indoor Humidity36% (Slightly Humid)

Dew Point56° F

AccuLumen Brightness Index™9 (Very Bright)

Cloud Cover11%

Visibility10 mi

Cloud Ceiling30000 ft

5 PM

84°
RealFeel® 84°
Very Warm
RealFeel Guide
Very Warm
82° to 89°
Older adults, infants, and those with sensitive medical conditions should minimize outdoor activity, especially in the sunshine.
LEARN MORE
rain drop 0%
Chevron down
Mostly sunny

RealFeel Shade™81°

Heat Index83°

WindWSW 10 mph

Air QualityPoor

Max UV Index3.4 (Moderate)

Wind Gusts23 mph

Humidity38%

Indoor Humidity38% (Slightly Humid)

Dew Point56° F

AccuLumen Brightness Index™9 (Very Bright)

Cloud Cover11%

Visibility10 mi

Cloud Ceiling30000 ft

6 PM

82°
RealFeel® 81°
Pleasant
RealFeel Guide
Pleasant
63° to 81°
Most consider this temperature range ideal.
LEARN MORE
rain drop 0%
Chevron down
Mostly sunny

RealFeel Shade™79°

Heat Index81°

WindWSW 10 mph

Air QualityPoor

Max UV Index2.1 (Low)

Wind Gusts21 mph

Humidity41%

Indoor Humidity41% (Slightly Humid)

Dew Point56° F

AccuLumen Brightness Index™9 (Very Bright)

Cloud Cover11%

Visibility10 mi

Cloud Ceiling30000 ft

7 PM

77°
RealFeel® 76°
Pleasant
RealFeel Guide
Pleasant
63° to 81°
Most consider this temperature range ideal.
LEARN MORE
rain drop 0%
Chevron down
Mostly sunny

RealFeel Shade™74°

WindWSW 9 mph

Air QualityPoor

Max UV Index1.1 (Low)

Wind Gusts18 mph

Humidity47%

Indoor Humidity47% (Slightly Humid)

Dew Point56° F

AccuLumen Brightness Index™6 (Medium)

Cloud Cover11%

Visibility10 mi

Cloud Ceiling30000 ft

8 PM

74°
RealFeel® 71°
Pleasant
RealFeel Guide
Pleasant
63° to 81°
Most consider this temperature range ideal.
LEARN MORE
rain drop 0%
Chevron down
Sunny

RealFeel Shade™71°

WindWSW 9 mph

Air QualityPoor

Max UV Index0.1 (Low)

Wind Gusts16 mph

Humidity53%

Indoor Humidity53% (Slightly Humid)

Dew Point56° F

AccuLumen Brightness Index™0 (Dark)

Cloud Cover3%

Visibility10 mi

Cloud Ceiling30000 ft

9 PM

71°
RealFeel® 68°
Pleasant
RealFeel Guide
Pleasant
63° to 81°
Most consider this temperature range ideal.
LEARN MORE
rain drop 0%
Chevron down
Mostly clear

WindWSW 8 mph

Air QualityPoor

Wind Gusts13 mph

Humidity61%

Indoor Humidity61% (Slightly Humid)

Dew Point57° F

AccuLumen Brightness Index™0 (Dark)

Cloud Cover10%

Visibility10 mi

Cloud Ceiling30000 ft

10 PM

68°
RealFeel® 65°
Pleasant
RealFeel Guide
Pleasant
63° to 81°
Most consider this temperature range ideal.
LEARN MORE
rain drop 0%
Chevron down
Mostly clear

WindSW 7 mph

Air QualityPoor

Wind Gusts9 mph

Humidity69%

Indoor Humidity69% (Slightly Humid)

Dew Point58° F

AccuLumen Brightness Index™0 (Dark)

Cloud Cover10%

Visibility10 mi

Cloud Ceiling30000 ft

11 PM

65°
RealFeel® 64°
Pleasant
RealFeel Guide
Pleasant
63° to 81°
Most consider this temperature range ideal.
LEARN MORE
rain drop 0%
Chevron down
Mostly clear

WindSW 6 mph

Air QualityPoor

Wind Gusts7 mph

Humidity77%

Indoor Humidity69% (Slightly Humid)

Dew Point58° F

AccuLumen Brightness Index™0 (Dark)

Cloud Cover10%

Visibility10 mi

Cloud Ceiling30000 ft

Hourly Weather Forecast for Diamond Bar

AccuWeather's hourly forecast for Diamond Bar provides hour-by-hour temperatures, RealFeel® Temperature, and precipitation probability through the next 10 days. The current hour shows 82° with a RealFeel® of 89°, sunny with a 0% chance of precipitation. Each hourly forecast includes wind speed, humidity, air quality, UV index, and the AccuLumen Brightness Index™, AccuWeather's measure of perceived outdoor light intensity. Forecasts are generated by proprietary systems developed by AccuWeather meteorologists since 1962.

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