| Sat May 18 | Sun May 19 | Mon May 20 | Tue May 21 | |
| Tmin 18-06 |
15°C | 16°C | 16°C | 16°C |
| Tmax 06-18 |
22°C | 24°C | 27°C | 26°C |
| morning 24-06 |
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| a.m. 06-12 |
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| p.m. 12-18 |
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| evening 18-24 |
| Nearby Forecast Locations - Diamond Bar | Distance |
| Walnut | 4.6 km |
| Pomona | 7.2 km |
| West Covina | 7.9 km |
| Rowland Heights | 8.5 km |
| Brea | 9.3 km |
| Covina | 10.4 km |
| La Verne | 11.2 km |
| San Dimas | 11.2 km |
| Glendora | 12.0 km |
| La Puente | 12.4 km |
| Chino Hills | 12.4 km |
| Montclair | 13.1 km |
| La Verne | 13.3 km |
| Claremont | 13.5 km |
| Hacienda Heights | 14.0 km |
| La Habra | 15.4 km |
| Placentia | 15.5 km |
| Chino | 15.8 km |
| Azusa | 15.9 km |
| Baldwin Park | 16.7 km |
| Yorba Linda | 16.7 km |
| Upland | 18.0 km |
| Fullerton | 18.4 km |
| Pasadena | 19.0 km |
| Ontario | 19.3 km |
| Duarte | 20.3 km |
| Ontario | 20.3 km |
| Villa Park | 20.4 km |
| South El Monte | 21.8 km |
| Fullerton | 22.5 km |
| La Mirada | 22.6 km |
| Anaheim | 22.7 km |
| El Monte | 23.4 km |
| Arcadia | 23.8 km |
| Santa Fe Springs | 24.2 km |
| Norco | 24.9 km |
| Pico Rivera | 24.9 km |
| Buena Park | 25.1 km |
| Rosemead | 25.2 km |
| Temple | 25.6 km |
| Mira Loma | 26.2 km |
| Norwalk | 27.0 km |
| La Palma | 27.3 km |
| Cerritos | 27.3 km |
| Montebello | 27.7 km |
| Rancho Cucamonga | 27.7 km |
| San Gabriel | 27.7 km |
| Monterey Park | 27.9 km |
| Stanton | 28.0 km |
| Sierra Madre | 28.5 km |
| Downey | 29.2 km |
| Tustin | 29.7 km |
| Garden Grove | 29.8 km |
| Forecast: Diamond Bar Region In the next few days, it's mostly sunny. Mainly dry. The daily high temperature near 26 degrees. |