Union Weather Forecast 15 Days, Weather in Union Today
Current weather conditions and 15 day weather forecast for Union, Washington, 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 Union
| 16 December 2025 Tuesday 8.3 ° C / 46.9°F  Overcast |
Feels Like : 8.4 ° C / 47°F Humidity : % 100 Pressure : 1016 mb Wind Speed : 3.6 kmph / 2.2 miles from SSW  Visibility : 16 km Precipitation (rainfall) : 0.01 mm Cloud (%) : 100 |
15 day weather forecast for Union, WA, USA
Weather Forecast for next 15 Days for Union 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 Union, Washington 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 | |
|---|---|---|---|---|---|---|---|---|---|---|
| 16 December 2025 Tuesday |  Heavy rain |
7.2 ° C (45°F) |
12.4 ° C (54.3°F) |
9.9 ° C (49.9°F) |
% 91 | 90% | 0 | Sunrise:07:54 AM Sunset: 04:23 PM |
Moonrise:05:00 AM Moonset: 01:51 PM Moon Phase ( Waning Crescent ) |
|
| 17 December 2025 Wednesday | Heavy rain |
5.8 ° C (42.4°F) |
7.2 ° C (45°F) |
6.9 ° C (44.4°F) |
% 81 | 88% | 0.1 | Sunrise:07:54 AM Sunset: 04:23 PM |
Moonrise:06:08 AM Moonset: 02:18 PM Moon Phase ( Waning Crescent ) |
|
| 18 December 2025 Thursday | Heavy rain |
3.2 ° C (37.8°F) |
8.5 ° C (47.2°F) |
5.4 ° C (41.8°F) |
% 94 | 89% | 0 | Sunrise:07:55 AM Sunset: 04:24 PM |
Moonrise:07:13 AM Moonset: 02:55 PM Moon Phase ( Waning Crescent ) |
|
| 19 December 2025 Friday |  Patchy rain nearby |
1.2 ° C (34.1°F) |
7.1 ° C (44.7°F) |
4.4 ° C (39.9°F) |
% 85 | 89% | 0.1 | Sunrise:07:56 AM Sunset: 04:24 PM |
Moonrise:08:12 AM Moonset: 03:43 PM Moon Phase ( New Moon ) |
|
| 20 December 2025 Saturday | Patchy rain nearby |
0.9 ° C (33.7°F) |
4.8 ° C (40.7°F) |
2.8 ° C (37°F) |
% 96 | 87% | 0 | Sunrise:07:56 AM Sunset: 04:25 PM |
Moonrise:09:03 AM Moonset: 04:40 PM Moon Phase ( New Moon ) |
|
| 21 December 2025 Sunday |  Moderate rain |
0.4 ° C (32.8°F) |
3.6 ° C (38.4°F) |
2.7 ° C (36.9°F) |
% 97 | 83% | 1 | Sunrise:07:57 AM Sunset: 04:25 PM |
Moonrise:09:43 AM Moonset: 05:47 PM Moon Phase ( Waxing Crescent ) |
|
| 22 December 2025 Monday | Moderate rain |
0.1 ° C (32.3°F) |
5.4 ° C (41.7°F) |
2.9 ° C (37.2°F) |
% 90 | 88% | 1 | Sunrise:07:57 AM Sunset: 04:26 PM |
Moonrise:10:14 AM Moonset: 06:58 PM Moon Phase ( Waxing Crescent ) |
|
| 23 December 2025 Tuesday |  Fog |
0.1 ° C (32.2°F) |
3.3 ° C (38°F) |
1.4 ° C (34.5°F) |
% 98 | 0% | 1 | Sunrise:07:58 AM Sunset: 04:26 PM |
Moonrise:10:38 AM Moonset: 08:10 PM Moon Phase ( Waxing Crescent ) |
|
| 24 December 2025 Wednesday | Patchy rain nearby |
-0.5 ° C (31.1°F) |
4.6 ° C (40.3°F) |
2.8 ° C (37°F) |
% 94 | 83% | 1 | Sunrise:07:58 AM Sunset: 04:27 PM |
Moonrise:10:58 AM Moonset: 09:24 PM Moon Phase ( Waxing Crescent ) |
|
| 25 December 2025 Thursday | Moderate rain |
1.2 ° C (34.2°F) |
4.6 ° C (40.4°F) |
3.1 ° C (37.5°F) |
% 95 | 84% | 1 | Sunrise:07:58 AM Sunset: 04:27 PM |
Moonrise:11:16 AM Moonset: 10:36 PM Moon Phase ( Waxing Crescent ) |
|
| 26 December 2025 Friday | Moderate rain |
0.3 ° C (32.6°F) |
5.9 ° C (42.6°F) |
3.8 ° C (38.8°F) |
% 93 | 80% | 1 | Sunrise:07:59 AM Sunset: 04:28 PM |
Moonrise:11:32 AM Moonset: 11:51 PM Moon Phase ( Waxing Crescent ) |
|
| 27 December 2025 Saturday | Heavy rain |
6.4 ° C (43.6°F) |
8.5 ° C (47.3°F) |
8.4 ° C (47.1°F) |
% 92 | 87% | 2 | Sunrise:07:59 AM Sunset: 04:29 PM |
Moonrise:11:48 AM Moonset: No moonset Moon Phase ( First Quarter ) |
|
| 28 December 2025 Sunday | Moderate rain |
4.3 ° C (39.8°F) |
4.7 ° C (40.5°F) |
4.9 ° C (40.8°F) |
% 95 | 89% | 1 | Sunrise:07:59 AM Sunset: 04:30 PM |
Moonrise:12:06 PM Moonset: 01:07 AM Moon Phase ( Waxing Gibbous ) |
|
| 29 December 2025 Monday | Patchy rain nearby |
1.3 ° C (34.4°F) |
5.9 ° C (42.6°F) |
3.8 ° C (38.8°F) |
% 87 | 86% | 1 | Sunrise:07:59 AM Sunset: 04:31 PM |
Moonrise:12:27 PM Moonset: 02:28 AM Moon Phase ( Waxing Gibbous ) |
|
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