Diamond Bar, CA Weather Forecast
Local 7-day forecast
Patchy Fog then Mostly Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for Diamond Bar, CA in one place.
Patchy fog before 11am. Mostly sunny, with a high near 79. Southwest wind 0 to 10 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: Jun 1, 2026 5:43 PM PDT.
The active forecast window currently covers Jun 3 to Jun 7, 2026 for Diamond Bar, CA.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Jun 3 to Jun 7, 2026
- Latest sync
- Jun 1, 2026 5:43 PM PDT
- Forecast office
- LOX
- Source
- NOAA / NWS
Daily Outlook
This Week in Diamond Bar
Thursday looks like the warmest upcoming period in Diamond Bar at 81 degrees F.
Friday Night is the coolest period ahead with temperatures near 56 degrees F.
The strongest winds are forecast for Wednesday at about 0 to 10 mph SW.
The forecast from Jun 3 through Jun 7 stays mostly dry.
Forecast Details
- Last updated
- Jun 1, 2026 5:43 PM PDT
- Coverage
- 6 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 58.
Sunny, with a high near 81.
Mostly clear, with a low around 58.
Sunny, with a high near 79.
Partly cloudy, with a low around 56.
Mostly sunny, with a high near 77.
Partly cloudy, with a low around 56.
Sunny, with a high near 75.
Mostly clear, with a low around 56.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Wednesday
Jun 3
|
Patchy Fog then Mostly Sunny
|
79°F |
0 to 10 mph
SW
|
|
Wednesday Night
Jun 3
|
Mostly Clear
|
58°F |
0 to 10 mph
SW
|
|
Thursday
Jun 4
|
Sunny
|
81°F |
0 to 10 mph
SW
|
|
Thursday Night
Jun 4
|
Mostly Clear
|
58°F |
0 to 10 mph
SW
|
|
Friday
Jun 5
|
Sunny
|
79°F |
0 to 10 mph
SW
|
|
Friday Night
Jun 5
|
Partly Cloudy
|
56°F |
0 to 10 mph
SW
|
|
Saturday
Jun 6
|
Mostly Sunny
|
77°F |
0 to 10 mph
SW
|
|
Saturday Night
Jun 6
|
Partly Cloudy
|
56°F |
0 to 10 mph
SSW
|
|
Sunday
Jun 7
|
Sunny
|
75°F |
0 to 10 mph
SSW
|
|
Sunday Night
Jun 7
|
Mostly Clear
|
56°F |
0 to 10 mph
SW
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Diamond Bar.
