Diamond Bar, CA Weather Forecast
Local 7-day forecast
Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for Diamond Bar, CA in one place.
Sunny, with a high near 94. East northeast wind 15 to 20 mph, with gusts as high as 30 mph.
Local Weather Overview
This forecast page for Diamond Bar, CA is designed for quick trip planning, giving you a clean read on daytime highs, overnight lows, and changing conditions across the upcoming forecast window. Latest sync: Oct 15, 2026 2:31 PM PDT.
The active forecast window currently covers Oct 16 to Oct 21, 2026 for Diamond Bar, CA.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Oct 16 to Oct 21, 2026
- Latest sync
- Oct 15, 2026 2:31 PM PDT
- Forecast office
- LOX
- Source
- NOAA / NWS
Daily Outlook
This Week in Diamond Bar
Friday looks like the warmest upcoming period in Diamond Bar at 94 degrees F.
Wednesday Night is the coolest period ahead with temperatures near 54 degrees F.
The strongest winds are forecast for Friday at about 15 to 20 mph ENE.
Precipitation is mentioned in 4 upcoming forecast periods.
Forecast Details
- Last updated
- Oct 15, 2026 2:31 PM PDT
- Coverage
- 7 days
- Time zone
- America/Los_Angeles
- Forecast office
- LOX
- Radar station
- KSOX
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Mostly clear, with a low around 70. East northeast wind around 15 mph, with gusts as high as 25 mph.
Sunny, with a high near 89. East wind 5 to 15 mph, with gusts as high as 20 mph.
Mostly clear, with a low around 65.
Sunny, with a high near 84.
Clear, with a low around 62.
Sunny, with a high near 81.
Mostly clear, with a low around 59.
A chance of rain showers after 11am. Mostly sunny, with a high near 70.
A chance of rain showers. Mostly cloudy, with a low around 56.
Rain showers likely. Partly sunny, with a high near 65.
A chance of rain showers. Mostly cloudy, with a low around 54.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Friday
Oct 16
|
Sunny
|
94°F |
15 to 20 mph
ENE
|
|
Friday Night
Oct 16
|
Mostly Clear
|
70°F |
15 mph
ENE
|
|
Saturday
Oct 17
|
Sunny
|
89°F |
5 to 15 mph
E
|
|
Saturday Night
Oct 17
|
Mostly Clear
|
65°F |
0 to 10 mph
E
|
|
Sunday
Oct 18
|
Sunny
|
84°F |
5 to 10 mph
E
|
|
Sunday Night
Oct 18
|
Clear
|
62°F |
0 to 10 mph
S
|
|
Monday
Oct 19
|
Sunny
|
81°F |
0 to 10 mph
S
|
|
Monday Night
Oct 19
|
Mostly Clear
|
59°F |
5 to 10 mph
S
|
|
Tuesday
Oct 20
|
Chance Rain Showers
|
70°F |
5 to 10 mph
S
|
|
Tuesday Night
Oct 20
|
Chance Rain Showers
|
56°F |
5 to 15 mph
SSW
|
|
Wednesday
Oct 21
|
Rain Showers Likely
|
65°F |
5 mph
SSE
|
|
Wednesday Night
Oct 21
|
Chance Rain Showers
|
54°F |
0 to 10 mph
SSE
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Diamond Bar.
