Fallon Weather Forecast 15 Days, Weather in Fallon Today
Current weather conditions and 15 day weather forecast for Fallon, Montana, 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 Fallon
| 14 December 2025 Sunday -12.8 ° C / 9°F  Clear |
Feels Like : -19.2 ° C / -2.5°F Humidity : % 84 Pressure : 1022 mb Wind Speed : 11.5 kmph / 7.2 miles from SE  Visibility : 16 km Precipitation (rainfall) : 0 mm Cloud (%) : 0 |
15 day weather forecast for Fallon, MT, USA
Weather Forecast for next 15 Days for Fallon 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 Fallon, Montana 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 | |
|---|---|---|---|---|---|---|---|---|---|---|
| 14 December 2025 Sunday | Sunny |
-12.8 ° C (9°F) |
4.3 ° C (39.7°F) |
-4.3 ° C (24.2°F) |
% 84 | 0% | 0.3 | Sunrise:07:38 AM Sunset: 04:13 PM |
Moonrise:02:28 AM Moonset: 12:58 PM Moon Phase ( Waning Crescent ) |
|
| 15 December 2025 Monday |  Overcast |
-4 ° C (24.8°F) |
3.9 ° C (39°F) |
-0.4 ° C (31.3°F) |
% 93 | 0% | 0.3 | Sunrise:07:39 AM Sunset: 04:13 PM |
Moonrise:03:35 AM Moonset: 01:17 PM Moon Phase ( Waning Crescent ) |
|
| 16 December 2025 Tuesday |  Partly Cloudy |
-2.1 ° C (28.2°F) |
2.7 ° C (36.9°F) |
1.1 ° C (33.9°F) |
% 91 | 0% | 0.2 | Sunrise:07:40 AM Sunset: 04:13 PM |
Moonrise:04:42 AM Moonset: 01:40 PM Moon Phase ( Waning Crescent ) |
|
| 17 December 2025 Wednesday |  Patchy rain nearby |
-1.9 ° C (28.6°F) |
4.5 ° C (40.1°F) |
1.7 ° C (35.1°F) |
% 69 | 87% | 0.1 | Sunrise:07:40 AM Sunset: 04:14 PM |
Moonrise:05:50 AM Moonset: 02:08 PM Moon Phase ( Waning Crescent ) |
|
| 18 December 2025 Thursday | Sunny |
-11.1 ° C (11.9°F) |
-6.1 ° C (20.9°F) |
-7 ° C (19.5°F) |
% 66 | 0% | 0 | Sunrise:07:41 AM Sunset: 04:14 PM |
Moonrise:06:55 AM Moonset: 02:44 PM Moon Phase ( Waning Crescent ) |
|
| 19 December 2025 Friday |  Light freezing rain |
-8 ° C (17.6°F) |
3.8 ° C (38.8°F) |
-1.4 ° C (29.6°F) |
% 68 | 69% | 1 | Sunrise:07:42 AM Sunset: 04:14 PM |
Moonrise:07:55 AM Moonset: 03:31 PM Moon Phase ( New Moon ) |
|
| 20 December 2025 Saturday | Partly Cloudy |
-12.6 ° C (9.2°F) |
-4.7 ° C (23.5°F) |
-8.6 ° C (16.5°F) |
% 73 | 0% | 2 | Sunrise:07:42 AM Sunset: 04:15 PM |
Moonrise:08:45 AM Moonset: 04:28 PM Moon Phase ( New Moon ) |
|
| 21 December 2025 Sunday | Sunny |
-4.4 ° C (24°F) |
0.1 ° C (32.1°F) |
-2.7 ° C (27.2°F) |
% 67 | 0% | 2 | Sunrise:07:43 AM Sunset: 04:15 PM |
Moonrise:09:26 AM Moonset: 05:34 PM Moon Phase ( Waxing Crescent ) |
|
| 22 December 2025 Monday | Partly Cloudy |
-6.3 ° C (20.6°F) |
3.1 ° C (37.5°F) |
-1.5 ° C (29.3°F) |
% 70 | 0% | 2 | Sunrise:07:43 AM Sunset: 04:16 PM |
Moonrise:09:58 AM Moonset: 06:44 PM Moon Phase ( Waxing Crescent ) |
|
| 23 December 2025 Tuesday | Sunny |
-13.1 ° C (8.3°F) |
-11.8 ° C (10.8°F) |
-11.7 ° C (11°F) |
% 70 | 0% | 2 | Sunrise:07:44 AM Sunset: 04:16 PM |
Moonrise:10:23 AM Moonset: 07:57 PM Moon Phase ( Waxing Crescent ) |
|
| 24 December 2025 Wednesday |  Cloudy |
-12.2 ° C (10.1°F) |
-3.1 ° C (26.4°F) |
-8.1 ° C (17.4°F) |
% 81 | 0% | 1 | Sunrise:07:44 AM Sunset: 04:17 PM |
Moonrise:10:44 AM Moonset: 09:09 PM Moon Phase ( Waxing Crescent ) |
|
| 25 December 2025 Thursday | Partly Cloudy |
-8.8 ° C (16.1°F) |
-3.3 ° C (26°F) |
-6.3 ° C (20.7°F) |
% 90 | 0% | 2 | Sunrise:07:44 AM Sunset: 04:18 PM |
Moonrise:11:02 AM Moonset: 10:21 PM Moon Phase ( Waxing Crescent ) |
|
| 26 December 2025 Friday | Light freezing rain |
-4.7 ° C (23.6°F) |
-2.6 ° C (27.3°F) |
-4 ° C (24.8°F) |
% 90 | 84% | 1 | Sunrise:07:45 AM Sunset: 04:18 PM |
Moonrise:11:19 AM Moonset: 11:35 PM Moon Phase ( Waxing Crescent ) |
|
| 27 December 2025 Saturday | Sunny |
-7.7 ° C (18.2°F) |
-0.8 ° C (30.6°F) |
-4.1 ° C (24.6°F) |
% 70 | 0% | 2 | Sunrise:07:45 AM Sunset: 04:19 PM |
Moonrise:11:36 AM Moonset: No moonset Moon Phase ( First Quarter ) |
|
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