Big Arm Weather Forecast 15 Days, Weather in Big Arm Today
Current weather conditions and 15 day weather forecast for Big Arm, 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 Big Arm
| 21 August 2026 Friday 30.3 ° C / 86.5°F  Sunny |
Feels Like : 28.5 ° C / 83.3°F Humidity : % 23 Pressure : 1013 mb Wind Speed : 5.4 kmph / 3.4 miles from NE  Visibility : 10 km Precipitation (rainfall) : 0 mm Cloud (%) : 4 |
15 day weather forecast for Big Arm, MT, USA
Weather Forecast for next 15 Days for Big Arm 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 Big Arm, 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 | |
|---|---|---|---|---|---|---|---|---|---|---|
| 20 August 2026 Thursday | Sunny |
15.6 ° C (60.1°F) |
33.1 ° C (91.6°F) |
23.7 ° C (74.6°F) |
% 31 | 0% | 7.1 | Sunrise:06:39 AM Sunset: 08:41 PM |
Moonrise:04:32 PM Moonset: Does not set today Moon Phase ( First Quarter ) |
|
| 21 August 2026 Friday |  Overcast |
13.1 ° C (55.5°F) |
28.9 ° C (84°F) |
21.5 ° C (70.7°F) |
% 36 | 7% | 7.6 | Sunrise:06:40 AM Sunset: 08:39 PM |
Moonrise:05:31 PM Moonset: 12:07 AM Moon Phase ( First Quarter ) |
|
| 22 August 2026 Saturday | Overcast |
17 ° C (62.6°F) |
30.8 ° C (87.4°F) |
23.1 ° C (73.5°F) |
% 37 | 57% | 5 | Sunrise:06:42 AM Sunset: 08:37 PM |
Moonrise:06:20 PM Moonset: 12:56 AM Moon Phase ( Waxing Gibbous ) |
|
| 23 August 2026 Sunday | Sunny |
13.3 ° C (55.9°F) |
27.7 ° C (81.9°F) |
20.1 ° C (68.2°F) |
% 49 | 36% | 6.8 | Sunrise:06:43 AM Sunset: 08:36 PM |
Moonrise:06:57 PM Moonset: 01:55 AM Moon Phase ( Waxing Gibbous ) |
|
| 24 August 2026 Monday | Sunny |
11.8 ° C (53.2°F) |
25.4 ° C (77.6°F) |
18.4 ° C (65.1°F) |
% 40 | 2% | 7 | Sunrise:06:44 AM Sunset: 08:34 PM |
Moonrise:07:26 PM Moonset: 03:00 AM Moon Phase ( Waxing Gibbous ) |
|
| 25 August 2026 Tuesday | Sunny |
12.5 ° C (54.5°F) |
29 ° C (84.1°F) |
19.9 ° C (67.9°F) |
% 37 | 2% | 7 | Sunrise:06:46 AM Sunset: 08:32 PM |
Moonrise:07:48 PM Moonset: 04:08 AM Moon Phase ( Full Moon ) |
|
| 26 August 2026 Wednesday | Overcast |
13.5 ° C (56.3°F) |
29.4 ° C (84.8°F) |
21.4 ° C (70.5°F) |
% 34 | 8% | 6 | Sunrise:06:47 AM Sunset: 08:30 PM |
Moonrise:08:06 PM Moonset: 05:17 AM Moon Phase ( Full Moon ) |
|
| 27 August 2026 Thursday | Sunny |
12 ° C (53.6°F) |
23.1 ° C (73.7°F) |
18.7 ° C (65.6°F) |
% 37 | 17% | 6 | Sunrise:06:48 AM Sunset: 08:28 PM |
Moonrise:08:22 PM Moonset: 06:25 AM Moon Phase ( Full Moon ) |
|
| 28 August 2026 Friday | Sunny |
6.9 ° C (44.5°F) |
25.3 ° C (77.5°F) |
15.6 ° C (60.1°F) |
% 29 | 1% | 7 | Sunrise:06:50 AM Sunset: 08:26 PM |
Moonrise:08:36 PM Moonset: 07:32 AM Moon Phase ( Full Moon ) |
|
| 29 August 2026 Saturday | Sunny |
8.5 ° C (47.3°F) |
24.1 ° C (75.5°F) |
15.9 ° C (60.5°F) |
% 33 | 3% | 6 | Sunrise:06:51 AM Sunset: 08:24 PM |
Moonrise:08:50 PM Moonset: 08:39 AM Moon Phase ( Waning Gibbous ) |
|
| 30 August 2026 Sunday |  Light rain shower |
11.4 ° C (52.6°F) |
20.5 ° C (69°F) |
15 ° C (58.9°F) |
% 57 | 61% | 5 | Sunrise:06:52 AM Sunset: 08:22 PM |
Moonrise:09:05 PM Moonset: 09:48 AM Moon Phase ( Waning Gibbous ) |
|
| 31 August 2026 Monday | Sunny |
7.5 ° C (45.5°F) |
20.6 ° C (69.1°F) |
13.8 ° C (56.9°F) |
% 61 | 17% | 6 | Sunrise:06:54 AM Sunset: 08:20 PM |
Moonrise:09:21 PM Moonset: 10:57 AM Moon Phase ( Waning Gibbous ) |
|
| 01 September 2026 Tuesday | Sunny |
8.1 ° C (46.6°F) |
24.9 ° C (76.8°F) |
15.6 ° C (60°F) |
% 51 | 4% | 6 | Sunrise:06:55 AM Sunset: 08:18 PM |
Moonrise:09:41 PM Moonset: 12:10 PM Moon Phase ( Waning Gibbous ) |
|
| 02 September 2026 Wednesday | Overcast |
11.1 ° C (51.9°F) |
23.2 ° C (73.7°F) |
16.5 ° C (61.8°F) |
% 57 | 12% | 5 | Sunrise:06:57 AM Sunset: 08:16 PM |
Moonrise:10:07 PM Moonset: 01:26 PM Moon Phase ( Last Quarter ) |
|
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