Diamond Bar Weather Forecast 15 Days, Weather in Diamond Bar Today
Current weather conditions and 15 day weather forecast for Diamond Bar, California, USA including weather daily high/low temperature, warnings, chance of precipitation, pressure, humidity/wind chill, rain risk, wind speed, cloud, pressure, and UV index.
Current weather conditions at Diamond Bar
| 17 December 2025 Wednesday 10.4 ° C / 50.7°F  Mist |
Feels Like : 10.7 ° C / 51.2°F Humidity : % 96 Pressure : 1019 mb Wind Speed : 3.6 kmph / 2.2 miles from NNE  Visibility : 4.8 km Precipitation (rainfall) : 0 mm Cloud (%) : 0 |
15 day weather forecast for Diamond Bar, CA, USA
Weather Forecast for next 15 Days for Diamond Bar including weather warnings, temperature, rain, wind speed, cloud, snow, wind speed and wind direction, pressure and UV index.Here is weather for the next 15 days in Diamond Bar, California state, US. To see the daily forecast, scroll to the table below.
| Date | Weather forecast | Low temperature | High temperature | Avg. temperature | Humidity | Chance of rain | UV Index | Sun Position | Moon Position | |
|---|---|---|---|---|---|---|---|---|---|---|
| 17 December 2025 Wednesday |  Sunny |
9.5 ° C (49.1°F) |
23.2 ° C (73.8°F) |
15.7 ° C (60.3°F) |
% 70 | 0% | 0.7 | Sunrise:06:51 AM Sunset: 04:44 PM |
Moonrise:04:57 AM Moonset: 02:47 PM Moon Phase ( Waning Crescent ) |
|
| 18 December 2025 Thursday | Sunny |
16.1 ° C (61°F) |
27.5 ° C (81.5°F) |
20.2 ° C (68.4°F) |
% 39 | 0% | 0.7 | Sunrise:06:51 AM Sunset: 04:45 PM |
Moonrise:05:55 AM Moonset: 03:30 PM Moon Phase ( Waning Crescent ) |
|
| 19 December 2025 Friday | Sunny |
16.6 ° C (61.9°F) |
23.3 ° C (73.9°F) |
19.4 ° C (66.8°F) |
% 37 | 0% | 0.6 | Sunrise:06:52 AM Sunset: 04:45 PM |
Moonrise:06:51 AM Moonset: 04:20 PM Moon Phase ( New Moon ) |
|
| 20 December 2025 Saturday | Sunny |
16.4 ° C (61.5°F) |
23.5 ° C (74.2°F) |
18.8 ° C (65.9°F) |
% 40 | 0% | 0.7 | Sunrise:06:52 AM Sunset: 04:46 PM |
Moonrise:07:43 AM Moonset: 05:15 PM Moon Phase ( New Moon ) |
|
| 21 December 2025 Sunday | Sunny |
15.8 ° C (60.5°F) |
22.4 ° C (72.3°F) |
18 ° C (64.5°F) |
% 48 | 0% | 0 | Sunrise:06:53 AM Sunset: 04:46 PM |
Moonrise:08:28 AM Moonset: 06:15 PM Moon Phase ( Waxing Crescent ) |
|
| 22 December 2025 Monday | Sunny |
16.9 ° C (62.4°F) |
23 ° C (73.3°F) |
19 ° C (66.2°F) |
% 40 | 0% | 5 | Sunrise:06:53 AM Sunset: 04:47 PM |
Moonrise:09:08 AM Moonset: 07:17 PM Moon Phase ( Waxing Crescent ) |
|
| 23 December 2025 Tuesday | Sunny |
13.7 ° C (56.7°F) |
18.5 ° C (65.3°F) |
16 ° C (60.7°F) |
% 61 | 0% | 5 | Sunrise:06:54 AM Sunset: 04:47 PM |
Moonrise:09:42 AM Moonset: 08:19 PM Moon Phase ( Waxing Crescent ) |
|
| 24 December 2025 Wednesday |  Patchy rain nearby |
13.2 ° C (55.7°F) |
15.5 ° C (59.9°F) |
14.6 ° C (58.3°F) |
% 73 | 87% | 3 | Sunrise:06:54 AM Sunset: 04:48 PM |
Moonrise:10:12 AM Moonset: 09:21 PM Moon Phase ( Waxing Crescent ) |
|
| 25 December 2025 Thursday |  Moderate rain |
13 ° C (55.4°F) |
14.7 ° C (58.4°F) |
14.5 ° C (58.2°F) |
% 79 | 84% | 3 | Sunrise:06:55 AM Sunset: 04:48 PM |
Moonrise:10:40 AM Moonset: 10:23 PM Moon Phase ( Waxing Crescent ) |
|
| 26 December 2025 Friday | Sunny |
11 ° C (51.8°F) |
15.8 ° C (60.4°F) |
13.2 ° C (55.7°F) |
% 64 | 0% | 4 | Sunrise:06:55 AM Sunset: 04:49 PM |
Moonrise:11:07 AM Moonset: 11:26 PM Moon Phase ( Waxing Crescent ) |
|
| 27 December 2025 Saturday |  Partly Cloudy |
11.3 ° C (52.4°F) |
16.5 ° C (61.8°F) |
13.7 ° C (56.7°F) |
% 50 | 0% | 4 | Sunrise:06:56 AM Sunset: 04:50 PM |
Moonrise:11:34 AM Moonset: No moonset Moon Phase ( First Quarter ) |
|
| 28 December 2025 Sunday |  Cloudy |
11.5 ° C (52.7°F) |
14.5 ° C (58.2°F) |
12.8 ° C (55°F) |
% 68 | 0% | 3 | Sunrise:06:56 AM Sunset: 04:50 PM |
Moonrise:12:03 PM Moonset: 12:31 AM Moon Phase ( Waxing Gibbous ) |
|
| 29 December 2025 Monday | Patchy rain nearby |
11.6 ° C (53°F) |
14.7 ° C (58.4°F) |
12.9 ° C (55.2°F) |
% 72 | 81% | 3 | Sunrise:06:56 AM Sunset: 04:51 PM |
Moonrise:12:35 PM Moonset: 01:40 AM Moon Phase ( Waxing Gibbous ) |
|
| 30 December 2025 Tuesday | Patchy rain nearby |
12.1 ° C (53.9°F) |
14.2 ° C (57.5°F) |
13.2 ° C (55.8°F) |
% 79 | 83% | 3 | Sunrise:06:56 AM Sunset: 04:52 PM |
Moonrise:01:15 PM Moonset: 02:51 AM Moon Phase ( Waxing Gibbous ) |
|
Add a link to your web page; copy and paste this html to your web page