Sweet Grass Weather Forecast 15 Days, Weather in Sweet Grass Today
Current weather conditions and 15 day weather forecast for Sweet Grass, 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 Sweet Grass
| 22 December 2025 Monday -13.9 ° C / 7°F  Clear |
Feels Like : -16.2 ° C / 2.8°F Humidity : % 86 Pressure : 1008 mb Wind Speed : 3.6 kmph / 2.2 miles from SE  Visibility : 10 km Precipitation (rainfall) : 0 mm Cloud (%) : 0 |
15 day weather forecast for Sweet Grass, MT, USA
Weather Forecast for next 15 Days for Sweet Grass 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 Sweet Grass, 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 | |
|---|---|---|---|---|---|---|---|---|---|---|
| 21 December 2025 Sunday | Sunny |
-5.9 ° C (21.4°F) |
4.7 ° C (40.5°F) |
-1 ° C (30.3°F) |
% 53 | 0% | 0.1 | Sunrise:08:19 AM Sunset: 04:33 PM |
Moonrise:10:06 AM Moonset: 05:51 PM Moon Phase ( Waxing Crescent ) |
|
| 22 December 2025 Monday | Sunny |
-6 ° C (21.2°F) |
2.8 ° C (37°F) |
-1.6 ° C (29.2°F) |
% 78 | 0% | 0.1 | Sunrise:08:20 AM Sunset: 04:34 PM |
Moonrise:10:36 AM Moonset: 07:04 PM Moon Phase ( Waxing Crescent ) |
|
| 23 December 2025 Tuesday |  Overcast |
-7.4 ° C (18.7°F) |
-3.2 ° C (26.2°F) |
-5.5 ° C (22.1°F) |
% 96 | 0% | 0.1 | Sunrise:08:20 AM Sunset: 04:34 PM |
Moonrise:10:59 AM Moonset: 08:18 PM Moon Phase ( Waxing Crescent ) |
|
| 24 December 2025 Wednesday |  Freezing fog |
-13.9 ° C (6.9°F) |
-2.7 ° C (27.1°F) |
-6.1 ° C (20.9°F) |
% 93 | 66% | 0.1 | Sunrise:08:21 AM Sunset: 04:35 PM |
Moonrise:11:18 AM Moonset: 09:34 PM Moon Phase ( Waxing Crescent ) |
|
| 25 December 2025 Thursday |  Light freezing rain |
-17.6 ° C (0.4°F) |
-13.8 ° C (7.2°F) |
-14.9 ° C (5.2°F) |
% 79 | 78% | 0.1 | Sunrise:08:21 AM Sunset: 04:36 PM |
Moonrise:11:33 AM Moonset: 10:48 PM Moon Phase ( Waxing Crescent ) |
|
| 26 December 2025 Friday |  Partly Cloudy |
-11.3 ° C (11.7°F) |
3.5 ° C (38.2°F) |
-6.6 ° C (20.1°F) |
% 79 | 0% | 0 | Sunrise:08:21 AM Sunset: 04:36 PM |
Moonrise:11:48 AM Moonset: No moonset Moon Phase ( Waxing Crescent ) |
|
| 27 December 2025 Saturday | Sunny |
-13.5 ° C (7.8°F) |
-5.6 ° C (21.9°F) |
-9.9 ° C (14.2°F) |
% 78 | 0% | 2 | Sunrise:08:21 AM Sunset: 04:37 PM |
Moonrise:12:02 PM Moonset: 12:04 AM Moon Phase ( First Quarter ) |
|
| 28 December 2025 Sunday | Sunny |
-6.6 ° C (20.1°F) |
2.2 ° C (36°F) |
-3.2 ° C (26.3°F) |
% 77 | 0% | 2 | Sunrise:08:22 AM Sunset: 04:38 PM |
Moonrise:12:17 PM Moonset: 01:23 AM Moon Phase ( Waxing Gibbous ) |
|
| 29 December 2025 Monday | Sunny |
-2.9 ° C (26.7°F) |
5.5 ° C (41.9°F) |
0.4 ° C (32.8°F) |
% 53 | 0% | 2 | Sunrise:08:22 AM Sunset: 04:39 PM |
Moonrise:12:37 PM Moonset: 02:45 AM Moon Phase ( Waxing Gibbous ) |
|
| 30 December 2025 Tuesday | Sunny |
-0 ° C (31.9°F) |
6.4 ° C (43.5°F) |
1.9 ° C (35.4°F) |
% 39 | 0% | 2 | Sunrise:08:22 AM Sunset: 04:40 PM |
Moonrise:01:02 PM Moonset: 04:12 AM Moon Phase ( Waxing Gibbous ) |
|
| 31 December 2025 Wednesday | Partly Cloudy |
-4.8 ° C (23.4°F) |
7.4 ° C (45.2°F) |
3.3 ° C (37.9°F) |
% 58 | 0% | 2 | Sunrise:08:22 AM Sunset: 04:41 PM |
Moonrise:01:38 PM Moonset: 05:41 AM Moon Phase ( Waxing Gibbous ) |
|
| 01 January 2026 Thursday | Sunny |
-5.1 ° C (22.8°F) |
-1.8 ° C (28.8°F) |
-4 ° C (24.8°F) |
% 77 | 0% | 2 | Sunrise:08:22 AM Sunset: 04:42 PM |
Moonrise:02:27 PM Moonset: 07:05 AM Moon Phase ( Waxing Gibbous ) |
|
| 02 January 2026 Friday | Light freezing rain |
-6.1 ° C (21°F) |
-0.4 ° C (31.3°F) |
-3.8 ° C (25.1°F) |
% 67 | 71% | 1 | Sunrise:08:22 AM Sunset: 04:43 PM |
Moonrise:03:36 PM Moonset: 08:16 AM Moon Phase ( Waxing Gibbous ) |
|
| 03 January 2026 Saturday | Partly Cloudy |
-7.9 ° C (17.8°F) |
-3.5 ° C (25.6°F) |
-5.1 ° C (22.8°F) |
% 56 | 0% | 2 | Sunrise:08:22 AM Sunset: 04:44 PM |
Moonrise:04:58 PM Moonset: 09:08 AM Moon Phase ( Full Moon ) |
|
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