Observed 1:50 PM PDT at KLGB

Diamond Bar, CA weather

Sunny and 79°26°, 8°4° colder than a typical Oct 24.

Mostly agree

Now 79°26°

Sunny

Wind: 5 mph7 km/h; From the west-southwest. About 5 mph8 km/h through 2 AM
Dew point: 54°12°; Comfortable
UV index: 5Moderate; Was high 1–2 PM · peak 6
Air today: 46Good; EPA forecast · Ozone
Pressure: 29.92 inHg1013 hPa; Falling slowly · −0.03 inHg−1.1 hPa in 3 h

No precipitation expected in the next 2 hours.

From forecast models

Next 48 hours

Good hours for

High 74°23° today at 3 PM
Low 55°13° tonight at 5 AM
Above 70°21° tomorrow by noon
Below 70°21° tomorrow night after 7 PM

This afternoonNear 72°22° · Clear
TonightDown to 55°13° by 5 AM · Clear
Tomorrow morningUp to 69°21° by 11 AM · Clear
Tomorrow afternoonUp to 77°25° by 3 PM · Partly cloudy
Tomorrow nightDown to 58°14° by 4 AM · Partly cloudy
Monday morningUp to 72°22° by 11 AM · Clear

Hourly forecast, next 48 hours, in the place's local time
Hour	Conditions	Temperature	Feels like	Precipitation	Wind	Humidity	Cloud cover	UV index
Sat 2p	Sunny	73°23° (likely 73°23° to 75°24°)	73°23°	0%	5 mph8 km/h from WSW, gusts 9 mph15 km/h	53%	1%	5
Sat 3p	Sunny	74°23° (likely 74°23° to 76°24°)	74°23°	0%	5 mph8 km/h from WSW, gusts 9 mph15 km/h	51%	1%	3
Sat 4p	Sunny	73°23° (likely 73°23° to 77°25°)	73°23°	0%	5 mph8 km/h from WSW, gusts 9 mph15 km/h	52%	3%	2
Sat 5p	Sunny	71°22° (likely 71°22° to 76°24°)	71°22°	0%	5 mph8 km/h from WSW, gusts 10 mph17 km/h	53%	1%	2
Sat 6p	Clear	68°20° (likely 68°20° to 72°22°)	68°20°	0%	5 mph8 km/h from WSW, gusts 10 mph15 km/h	61%	1%	0
Sat 7p	Clear	65°18° (likely 64°18° to 68°20°)	65°18°	0%	5 mph8 km/h from WSW, gusts 9 mph15 km/h	68%	0%	0
Sat 8p	Clear	64°18° (likely 61°16° to 66°19°)	64°18°	0%	5 mph8 km/h from SW, gusts 8 mph12 km/h	74%	0%	0
Sat 9p	Clear	62°17° (likely 58°14° to 64°18°)	62°17°	0%	5 mph8 km/h from SW, gusts 6 mph10 km/h	77%	0%	0
Sat 10p	Clear	61°16° (likely 57°14° to 62°17°)	61°16°	0%	5 mph8 km/h from SW, gusts 5 mph8 km/h	78%	0%	0
Sat 11p	Clear	59°15° (likely 55°13° to 60°16°)	59°15°	0%	5 mph8 km/h from E, gusts 6 mph10 km/h	80%	1%	0
Sun 12a	Clear	59°15° (likely 54°12° to 60°16°)	59°15°	0%	5 mph8 km/h from E, gusts 7 mph11 km/h	80%	0%	0
Sun 1a	Clear	58°14° (likely 53°12° to 59°15°)	58°14°	0%	5 mph8 km/h from E, gusts 7 mph12 km/h	83%	0%	0
Sun 2a	Clear	58°14° (likely 53°12° to 58°14°)	58°14°	0%	5 mph8 km/h from E, gusts 7 mph11 km/h	83%	0%	0
Sun 3a	Clear	56°13° (likely 52°11° to 57°14°)	56°13°	0%	5 mph8 km/h from E, gusts 7 mph11 km/h	82%	0%	0
Sun 4a	Clear	56°13° (likely 52°11° to 58°14°)	56°13°	0%	5 mph8 km/h from E, gusts 7 mph11 km/h	81%	0%	0
Sun 5a	Clear	55°13° (likely 52°11° to 57°14°)	55°13°	0%	5 mph8 km/h from E, gusts 7 mph11 km/h	81%	0%	0
Sun 6a	Clear	55°13° (likely 52°11° to 57°14°)	55°13°	0%	5 mph8 km/h from E, gusts 7 mph11 km/h	81%	0%	0
Sun 7a	Sunny	55°13° (likely 51°11° to 57°14°)	55°13°	0%	5 mph8 km/h from E, gusts 8 mph13 km/h	79%	0%	0
Sun 8a	Sunny	58°14° (likely 53°12° to 58°14°)	58°14°	0%	5 mph8 km/h from E, gusts 8 mph12 km/h	76%	0%	0
Sun 9a	Sunny	61°16° (likely 59°15° to 64°18°)	61°16°	0%	5 mph8 km/h from E, gusts 6 mph10 km/h	72%	0%	1
Sun 10a	Sunny	66°19° (likely 64°18° to 69°21°)	66°19°	0%	5 mph8 km/h from E, gusts 7 mph11 km/h	63%	2%	3
Sun 11a	Sunny	69°21° (likely 68°20° to 72°22°)	69°21°	0%	5 mph8 km/h from WSW, gusts 5 mph9 km/h	56%	2%	4
Sun 12p	Sunny	72°22° (likely 72°22° to 75°24°)	72°22°	0%	5 mph8 km/h from WSW, gusts 4 mph6 km/h	49%	1%	5
Sun 1p	Sunny	74°23° (likely 74°23° to 77°25°)	74°23°	0%	5 mph8 km/h from WSW, gusts 5 mph7 km/h	47%	0%	5
Sun 2p	Sunny	75°24° (likely 75°24° to 78°26°)	75°24°	0%	5 mph8 km/h from WSW, gusts 6 mph10 km/h	45%	40%	5
Sun 3p	Sunny	77°25° (likely 77°25° to 79°26°)	77°25°	0%	5 mph8 km/h from WSW, gusts 7 mph12 km/h	44%	40%	4
Sun 4p	Sunny	76°24° (likely 76°24° to 79°26°)	76°24°	0%	5 mph8 km/h from WSW, gusts 9 mph15 km/h	45%	40%	3
Sun 5p	Sunny	74°23° (likely 74°23° to 77°25°)	74°23°	0%	5 mph8 km/h from W, gusts 13 mph20 km/h	46%	40%	1
Sun 6p	Clear	70°21° (likely 70°21° to 73°23°)	70°21°	0%	5 mph8 km/h from W, gusts 10 mph17 km/h	55%	43%	0
Sun 7p	Cloudy	68°20° (likely 65°18° to 70°21°)	68°20°	0%	5 mph8 km/h from W, gusts 9 mph14 km/h	63%	65%	0
Sun 8p	Partly cloudy	67°19° (likely 62°17° to 67°19°)	67°19°	0%	5 mph8 km/h from W, gusts 4 mph7 km/h	67%	72%	0
Sun 9p	Partly cloudy	66°19° (likely 59°15° to 66°19°)	66°19°	0%	5 mph8 km/h from W, gusts 4 mph6 km/h	71%	76%	0
Sun 10p	Cloudy	66°19° (likely 57°14° to 66°19°)	66°19°	0%	5 mph8 km/h from W, gusts 5 mph8 km/h	75%	79%	0
Sun 11p	Cloudy	64°18° (likely 56°13° to 64°18°)	64°18°	0%	5 mph8 km/h from ENE, gusts 5 mph8 km/h	76%	79%	0
Mon 12a	Cloudy	63°17° (likely 55°13° to 63°17°)	63°17°	0%	5 mph8 km/h from ENE, gusts 4 mph7 km/h	78%	74%	0
Mon 1a	Mostly clear	61°16° (likely 55°13° to 61°16°)	61°16°	0%	5 mph8 km/h from ENE, gusts 6 mph10 km/h	80%	61%	0
Mon 2a	Partly cloudy	60°16° (likely 54°12° to 60°16°)	60°16°	0%	5 mph8 km/h from ENE, gusts 6 mph10 km/h	81%	41%	0
Mon 3a	Clear	60°16° (likely 54°12° to 60°16°)	60°16°	0%	5 mph8 km/h from ENE, gusts 7 mph11 km/h	79%	2%	0
Mon 4a	Clear	58°14° (likely 53°12° to 59°15°)	58°14°	0%	5 mph8 km/h from ENE, gusts 7 mph11 km/h	78%	1%	0
Mon 5a	Clear	58°14° (likely 52°11° to 58°14°)	58°14°	0%	5 mph8 km/h from ENE, gusts 7 mph11 km/h	79%	1%	0
Mon 6a	Clear	58°14° (likely 51°11° to 58°14°)	58°14°	0%	5 mph8 km/h from ENE, gusts 7 mph12 km/h	78%	3%	0
Mon 7a	Sunny	57°14° (likely 50°10° to 58°14°)	57°14°	0%	5 mph8 km/h from ENE, gusts 8 mph12 km/h	77%	0%	0
Mon 8a	Sunny	62°17° (likely 52°11° to 62°17°)	62°17°	0%	5 mph8 km/h from ENE, gusts 8 mph13 km/h	74%	0%	0
Mon 9a	Sunny	65°18° (likely 59°15° to 65°18°)	65°18°	0%	5 mph8 km/h from ENE, gusts 7 mph12 km/h	68%	0%	1
Mon 10a	Sunny	69°21° (likely 65°18° to 69°21°)	69°21°	0%	5 mph8 km/h from ENE, gusts 5 mph8 km/h	59%	0%	3
Mon 11a	Sunny	72°22° (likely 71°22° to 73°23°)	72°22°	0%	5 mph8 km/h from WSW, gusts 3 mph5 km/h	51%	1%	4
Mon 12p	Sunny	75°24° (likely 74°23° to 75°24°)	75°24°	0%	5 mph8 km/h from WSW, gusts 5 mph8 km/h	46%	0%	5
Mon 1p	Sunny	77°25° (likely 76°24° to 77°25°)	77°25°	0%	5 mph8 km/h from WSW, gusts 8 mph13 km/h	43%	0%	5

Days ahead

Shaded: typical range for these dates (1991–2020)

Today, Oct 24. Sunny. High 74°23°, low 55°13°. Typical 82°28° / 58°14°. Dry. Mostly agree.
1. Afternoon
  noon–6 PM
  Sunny, 74°23°
  Dry
2. Evening
  6 PM–midnight
  Clear, 64°18°
  Dry
3. Overnight
  midnight–6 AM
  Clear, 55°13°
  Dry
Official NWS forecast
Today: Sunny, with a high near 74. West southwest wind around 5 mph.
Tonight: Clear, with a low around 55. South southwest wind around 5 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
74°23°–77°25°
Low, likely
50°10°–56°13°
Typical high / low
82°28° / 58°14°
Wind
8 mph13 km/h, gusts 14 mph22 km/h
UV peak
5
Tomorrow, Oct 25. Cloudy. High 77°25°, low 57°14°. Typical 82°28° / 58°14°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 58°14°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 77°25°
  Dry
3. Evening
  6 PM–midnight
  Partly cloudy, 67°19°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 58°14°
  Dry
Official NWS forecast
Day: Sunny, with a high near 77. West southwest wind around 5 mph.
Night: Partly cloudy, with a low around 57. Northeast wind around 5 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
77°25°–79°26°
Low, likely
51°11°–57°14°
Typical high / low
82°28° / 58°14°
Wind
10 mph16 km/h
UV peak
5
Monday, Oct 26. Mostly sunny. High 78°26°, low 56°13°. Typical 82°28° / 58°14°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 62°17°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 78°26°
  Dry
3. Evening
  6 PM–midnight
  Clear, 65°18°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 54°12°
  Dry
Official NWS forecast
Day: Sunny, with a high near 78. North northwest wind around 5 mph.
Night: Mostly clear, with a low around 56.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
77°25°–78°26°
Low, likely
50°10°–57°14°
Typical high / low
82°28° / 58°14°
Wind
9 mph15 km/h, gusts 16 mph26 km/h
UV peak
5
Tuesday, Oct 27. Mostly sunny. High 76°24°, low 56°13°. Typical 82°28° / 57°14°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 55°13°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 76°24°
  Dry
3. Evening
  6 PM–midnight
  Clear, 64°18°
  Dry
4. Overnight
  midnight–6 AM
  Partly cloudy, 55°13°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 76.
Night: Partly cloudy, with a low around 56.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
73°23°–77°25°
Low, likely
48°9°–60°16°
Typical high / low
82°28° / 57°14°
Wind
7 mph11 km/h, gusts 15 mph24 km/h
UV peak
5
Wednesday, Oct 28. Cloudy. High 74°23°, low 57°14°. Typical 82°28° / 57°14°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Partly sunny, 55°13°
  Dry
2. Afternoon
  noon–6 PM
  Partly sunny, 74°23°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 64°18°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 56°14°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Partly sunny, with a high near 74.
Night: Mostly cloudy, with a low around 57.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
72°22°–75°24°
Low, likely
50°10°–59°15°
Typical high / low
82°28° / 57°14°
Wind
8 mph13 km/h
UV peak
5
Thursday, Oct 29. Cloudy. High 72°22°, low 57°14°. Typical 82°28° / 57°14°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Cloudy, 58°14°
  Dry
2. Afternoon
  noon–6 PM
  Mostly sunny, 72°22°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 63°17°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 59°15°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly cloudy, with a high near 72.
Night: A slight chance of rain showers after 5am. Mostly cloudy, with a low around 57.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
70°21°–73°23°
Low, likely
53°12°–61°16°
Typical high / low
82°28° / 57°14°
Wind
11 mph18 km/h, gusts 21 mph33 km/h
UV peak
5
Friday, Oct 30. Showers. High 68°20°, low 55°13°. Typical 81°27° / 57°14°. Rain 0.09 in2.3 mm, 20% chance. Forecasts agree.
1. Morning
  6 AM–noon
  Drizzle, 59°15°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 67°19°
  20% chance · 0.03 in0.7 mm
3. Evening
  6 PM–midnight
  Partly cloudy, 61°16°
  30% chance
4. Overnight
  midnight–6 AM
  Drizzle, 57°14°
  30% chance · 0.08 in1.9 mm
Hours this far out come from computer models only.
Official NWS forecast
Day: A slight chance of rain showers. Partly sunny, with a high near 68.
Night: A slight chance of rain showers. Mostly cloudy, with a low around 55.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
65°18°–68°20°
Low, likely
55°13°–60°16°
Typical high / low
81°27° / 57°14°
Wind
9 mph15 km/h
UV peak
3
Saturday, Oct 31. Drizzle. High 65°18°, low 56°13°. Typical 81°27° / 56°13°. Rain 0.22 in5.6 mm, 30% chance. Forecasts agree.
1. Morning
  6 AM–noon
  Drizzle, 57°14°
  30% chance
2. Afternoon
  noon–6 PM
  Cloudy, 66°19°
  20% chance
3. Evening
  6 PM–midnight
  Cloudy, 60°15°
  30% chance
4. Overnight
  midnight–6 AM
  Cloudy, 54°12°
  30% chance
Hours this far out come from computer models only.
The National Weather Service writes about seven days ahead; this day is our model forecast only.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
64°18°–66°19°
Low, likely
52°11°–59°15°
Typical high / low
81°27° / 56°13°
Wind
8 mph13 km/h, gusts 16 mph26 km/h
UV peak
4
Sunday, Nov 1. Drizzle. High 68°20°, low 53°12°. Typical 81°27° / 56°13°. Rain 0.13 in3.3 mm, 30% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 56°13°
  30% chance
2. Afternoon
  noon–6 PM
  Cloudy, 69°20°
  30% chance · 0.02 in0.6 mm
3. Evening
  6 PM–midnight
  Showers, 57°14°
  30% chance · 0.09 in2.4 mm
4. Overnight
  midnight–6 AM
  Showers, 52°11°
  30% chance · 0.17 in4.3 mm
Hours this far out come from computer models only.
The National Weather Service writes about seven days ahead; this day is our model forecast only.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
61°16°–74°23°
Low, likely
45°7°–62°17°
Typical high / low
81°27° / 56°13°
Wind
9 mph14 km/h, gusts 16 mph26 km/h
UV peak
2
Monday, Nov 2. Cloudy. High 66°19°, low 51°11°. Typical 81°27° / 56°13°. Rain 0.22 in5.6 mm, 30% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Drizzle, 58°14°
  20% chance · 0.03 in0.6 mm
2. Afternoon
  noon–6 PM
  Drizzle, 65°19°
  20% chance · 0.03 in0.8 mm
3. Evening
  6 PM–midnight
  Cloudy, 61°16°
  Dry
Hours this far out come from computer models only.
The National Weather Service writes about seven days ahead; this day is our model forecast only.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
61°16°–71°22°
Low, likely
44°7°–61°16°
Typical high / low
81°27° / 56°13°
Wind
12 mph19 km/h, gusts 26 mph42 km/h
UV peak
3

10 days15 days30 days

The outlook

Today
Dry, high 74°, low 55°.
Tomorrow
Dry, high 77°, low 57°, warming up.
Monday
Dry, high 78°, low 56°.
Rest of week
Mostly dry, highs 65–76°.

Want the meteorologists’ reasoning? Read the NWS forecast discussion (LOX) (opens in a new tab)

What changed since yesterday

No meaningful changes from yesterday’s forecast.

Radar

Radar data: NOAA MRMS, rendered by forecast.blue

Radar loads when scrolled into view

Full-screen radar

Rivers

NOAA river gauges within 25 mi

Puddingstone Dam

6.2 mi

Level: 0.2 ft

Reading from Sat 1:10 PM · NWS gauge page

Walnut Creek

7.0 mi

Level: 0.1 ft

Reading from Sat 12:30 PM · NWS gauge page

Big Dalton Wash

9.8 mi

Level: 0.2 ft

Reading from Sat 1:30 PM · NWS gauge page

Live Oak Dam

10 mi

Level: 0.0 ft

Reading from Sat 1:01 PM · NWS gauge page

For your home

What this week’s weather means for heating, cooling, pipes and fresh air.

Heating this week

This week 6Typical 0

Heating degree days, base 65°F

Comfort

Dry air outside (dew point 54°F).

Open the windows?

Today, 3:00 PM–10:00 PM

Good stretch to open the windows.

Is this typical?

ANAHEIM · official normals 1991–2020 · records 1989–2026

Oct 24, today vs a typical year

Today’s expected high is 8°4° colder than typical.

Last 7 days vs normal

—SunOct 18
—MonOct 19
—TueOct 20
—WedOct 21
—ThuOct 22
—FriOct 23
—SatOct 24

Diamond Bar weather by month: normals, records, snow and freeze dates

Sun & moon

Sun

Daylight: 11 h 3 min; Losing 1 min 57 s a day; shortest Dec 21, 1 h 9 min less
Golden hour: 5:32–6:22 PM; Morning 6:48–7:38 AM
Blue hour: 6:22–6:31 PM; Morning 6:38–6:48 AM; first light 6:38 AM

Stars tonight? Fair

Clear 6:31 PM–6:39 AM, but the moon is 99% lit and up.

Moon

Waxing gibbous

98% lit · growing

Today: sets 5:26 AM · rises 5:05 PM
Full moon: Oct 25
New moon: Nov 8

Looking northeast from Diamond Bar. The highest point on the skyline is about 11,400 ft, 56 mi away.Skyline from USGS elevation data, heights drawn up to 4.5× taller. Sky, sun and moon as they are now.