Diamond Bar, California Weather
Diamond Bar, California — live current conditions, hourly and 7-day forecasts, NWS alerts, radar and satellite imagery, tide predictions, marine conditions and a solunar fishing forecast for Diamond Bar, Los Angeles County.
Tides, marine forecast and fishing conditions near Diamond Bar. Tide source:
Full aviation weather for Diamond Bar is published on the Brackett Field (KPOC) page, 8 km away. It carries the current METAR decoded into plain language — surface wind, visibility, cloud layers and ceiling, temperature and dewpoint, and altimeter setting — alongside the raw observation as transmitted. 5 airfields within reach of Diamond Bar have their own pages, listed below.
The Terminal Aerodrome Forecast (TAF) is shown across its full validity period, with each change group broken out so you can see when conditions are expected to shift. Flight category is derived automatically — VFR, MVFR, IFR or LIFR — from reported ceiling and visibility, with runway details and field elevation alongside. Observations update roughly hourly and forecasts several times a day.
Other airports near Diamond Bar: Upland-Cable Airport (KCCB) 15 km · Ontario International Airport (KONT) 20 km · San Bernardino International Airport (KSBD) 53 km · Hesperia Airport (KL26) 60 km
Conditions reported at KPOC describe the airfield itself. Weather 8 km away can differ, particularly in terrain or near the coast. For conditions at Diamond Bar specifically, see the current conditions and forecast above.
About Diamond Bar, California
Diamond Bar rises from the rolling foothills where the San Gabriel Mountains begin to soften their grip on the urban sprawl, a landscape sculpted by ancient watercourses and the persistent California sun. It lies 3.2 miles east of Walnut, CA (from Walnut, CA: bearing 80°T), and is situated 9.4 miles west-south-west of Ontario. The terrain here is a tapestry of chaparral-covered slopes and broad, sun-drenched valleys, where the air often carries the dry, herbal scent of sage and the distant hum of traffic. Houses climb the hillsides like tenacious blossoms, their rooftops catching the light as it shifts from the sharp, bright clarity of midday to the molten gold of evening. The very contours of Diamond Bar suggest a place of transition, where the raw beauty of the undeveloped land meets the organized lines of human habitation, a constant, gentle dialogue between wildness and order. Historically, this region was shaped by agricultural endeavors, with citrus groves and vineyards once gracing these fertile soils, a legacy still whispered in the names of streets and the occasional mature fruit tree stubbornly clinging to life. The development of Diamond Bar, like much of Southern California, accelerated in the post-war era, transforming open country into a thriving suburban center. Today, its economy is a vibrant mix, drawing strength from its strategic position within the greater Los Angeles metropolitan area, serving as a hub for commerce and innovation. The presence of educational institutions fosters a sense of forward momentum, and the community, while embracing modern conveniences, retains a distinct character, a quiet pride in its unique geographical embrace between rugged nature and the pulse of a vast metropolis.
Live animated radar for Diamond Bar and surroundings — RainViewer.
NOAA GOES-16 GEOCOLOR — live animated loop updated every 10 minutes. Shows cloud cover, storm systems and weather patterns across the continental US.
Source: NOAA/NESDIS GOES-East · Public domain · Auto-updates on page reload
| Location | Diamond Bar, Los Angeles County, California |
| Coordinates | 34.028623°N, 117.810337°W |
| Timezone | Pacific Time (America/Los_Angeles) |
| ZIP Code(s) | 91765, 91789 |
| Area Code | 818, 747 |
| Page generated | September 2026 |
| Weather data | Open-Meteo (open-source), NOAA National Weather Service |
About This Diamond Bar, California Weather Page
This page provides live weather conditions and forecasts for Diamond Bar, California, including current conditions, a 24-hour hourly forecast, 7-day outlook, NWS extended text forecast, precipitation radar and NOAA GOES-16 satellite imagery. Aviation weather — live METAR observations and TAF forecasts — is published separately on the pages for the nearest reporting airports, linked from the aviation section above. Additional sections may include tide predictions, wave height, wave direction and sea-surface temperature, a barometric pressure trend, and a solunar-based fishing forecast with a fishing-conditions rating for coastal localities, and soil temperature, crop weather and live USGS river gauge data for agricultural areas near a monitored waterway. All data updates automatically on every page visit.
Location data for Diamond Bar includes coordinates 34.028623°N, 117.810337°W, situated in Los Angeles County. ZIP code 91765, 91789. Telephone area code: 818, 747. Timezone: Pacific Time (America/Los_Angeles).
Weather data is sourced from the NOAA National Weather Service (NWS) and the open-source Open-Meteo API. River and stream data is sourced from the USGS National Water Information System. Tide predictions are sourced from NOAA CO-OPS; marine and solunar data are modeled from Open-Meteo and public sunrise/moon calculations and should be treated as a general guide alongside on-the-water conditions. Radar is provided by RainViewer. Satellite imagery is sourced from NOAA/NESDIS GOES-East and is public domain.
