Boulder Weather Forecast 15 Days, Weather in Boulder Today
Current weather conditions and 15 day weather forecast for Boulder, 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 Boulder
| 18 September 2026 Friday 17.3 ° C / 63.2°F  Light rain |
Feels Like : 15.7 ° C / 60.3°F Humidity : % 52 Pressure : 1012 mb Wind Speed : 5 kmph / 3.1 miles from SE  Visibility : 9 km Precipitation (rainfall) : 0.85 mm Cloud (%) : 100 |
15 day weather forecast for Boulder, MT, USA
Weather Forecast for next 15 Days for Boulder 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 Boulder, 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 | |
|---|---|---|---|---|---|---|---|---|---|---|
| 17 September 2026 Thursday |  Sunny |
7.7 ° C (45.9°F) |
22.9 ° C (73.3°F) |
14 ° C (57.2°F) |
% 54 | 57% | 5.3 | Sunrise:07:09 AM Sunset: 07:36 PM |
Moonrise:03:04 PM Moonset: 10:49 PM Moon Phase ( First Quarter ) |
|
| 18 September 2026 Friday |  Overcast |
9.6 ° C (49.3°F) |
22.4 ° C (72.3°F) |
14.5 ° C (58.2°F) |
% 68 | 67% | 4.6 | Sunrise:07:10 AM Sunset: 07:34 PM |
Moonrise:03:57 PM Moonset: 11:45 PM Moon Phase ( First Quarter ) |
|
| 19 September 2026 Saturday |  Patchy rain nearby |
7.7 ° C (45.9°F) |
16.2 ° C (61.2°F) |
10.6 ° C (51.1°F) |
% 78 | 76% | 0.8 | Sunrise:07:11 AM Sunset: 07:32 PM |
Moonrise:04:40 PM Moonset: Does not set today Moon Phase ( First Quarter ) |
|
| 20 September 2026 Sunday | Sunny |
6.3 ° C (43.3°F) |
22.4 ° C (72.3°F) |
13 ° C (55.4°F) |
% 58 | 36% | 5.4 | Sunrise:07:13 AM Sunset: 07:30 PM |
Moonrise:05:13 PM Moonset: 12:48 AM Moon Phase ( Waxing Gibbous ) |
|
| 21 September 2026 Monday | Sunny |
8.5 ° C (47.4°F) |
22.2 ° C (71.9°F) |
14.4 ° C (58°F) |
% 40 | 3% | 5 | Sunrise:07:14 AM Sunset: 07:28 PM |
Moonrise:05:39 PM Moonset: 01:54 AM Moon Phase ( Waxing Gibbous ) |
|
| 22 September 2026 Tuesday | Sunny |
4.9 ° C (40.8°F) |
12.5 ° C (54.5°F) |
8.4 ° C (47.2°F) |
% 40 | 2% | 4 | Sunrise:07:15 AM Sunset: 07:26 PM |
Moonrise:06:00 PM Moonset: 03:01 AM Moon Phase ( Waxing Gibbous ) |
|
| 23 September 2026 Wednesday | Sunny |
4 ° C (39.2°F) |
19.4 ° C (66.9°F) |
11.1 ° C (52.1°F) |
% 36 | 3% | 5 | Sunrise:07:16 AM Sunset: 07:24 PM |
Moonrise:06:17 PM Moonset: 04:08 AM Moon Phase ( Waxing Gibbous ) |
|
| 24 September 2026 Thursday | Sunny |
8.7 ° C (47.6°F) |
23.9 ° C (75°F) |
15.3 ° C (59.6°F) |
% 41 | 2% | 6 | Sunrise:07:18 AM Sunset: 07:22 PM |
Moonrise:06:34 PM Moonset: 05:14 AM Moon Phase ( Full Moon ) |
|
| 25 September 2026 Friday | Sunny |
11 ° C (51.7°F) |
27.1 ° C (80.8°F) |
17.8 ° C (64.1°F) |
% 30 | 4% | 6 | Sunrise:07:19 AM Sunset: 07:20 PM |
Moonrise:06:49 PM Moonset: 06:20 AM Moon Phase ( Full Moon ) |
|
| 26 September 2026 Saturday | Overcast |
11 ° C (51.8°F) |
24.8 ° C (76.6°F) |
16.2 ° C (61.2°F) |
% 43 | 9% | 6 | Sunrise:07:20 AM Sunset: 07:18 PM |
Moonrise:07:05 PM Moonset: 07:27 AM Moon Phase ( Full Moon ) |
|
| 27 September 2026 Sunday | Sunny |
6.1 ° C (43°F) |
15.9 ° C (60.6°F) |
11.1 ° C (52°F) |
% 58 | 43% | 4 | Sunrise:07:21 AM Sunset: 07:16 PM |
Moonrise:07:23 PM Moonset: 08:35 AM Moon Phase ( Waning Gibbous ) |
|
| 28 September 2026 Monday | Overcast |
1.8 ° C (35.2°F) |
9.5 ° C (49°F) |
5.6 ° C (42.1°F) |
% 49 | 10% | 3 | Sunrise:07:23 AM Sunset: 07:15 PM |
Moonrise:07:43 PM Moonset: 09:46 AM Moon Phase ( Waning Gibbous ) |
|
| 29 September 2026 Tuesday | Overcast |
0.6 ° C (33.1°F) |
8.9 ° C (48°F) |
4.2 ° C (39.6°F) |
% 73 | 27% | 2 | Sunrise:07:24 AM Sunset: 07:13 PM |
Moonrise:08:09 PM Moonset: 11:00 AM Moon Phase ( Waning Gibbous ) |
|
| 30 September 2026 Wednesday | Sunny |
2.2 ° C (35.9°F) |
15.3 ° C (59.6°F) |
7.6 ° C (45.6°F) |
% 67 | 23% | 5 | Sunrise:07:25 AM Sunset: 07:11 PM |
Moonrise:08:43 PM Moonset: 12:15 PM Moon Phase ( Waning Gibbous ) |
|
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