Great Falls International Airport (GTF) 15 Day Weather Forecast, Great Falls United States
Current weather conditions and 15 day weather forecast for Great Falls International Airport in Great Falls, United States including weather daily high/low temperature, warnings, chance of precipitation, pressure, humidity/wind chill, rain, wind speed, cloud, pressure, and UV index.
Current weather conditions at GTF
| 17 September 2026 Thu 15.4 ° C ( 59.8°F )  Cloudy |
Feels Like : 13.5 ° C / 56.3°F Humidity : % 44 Pressure : 1017 mb Wind Speed : 3.6 kmph / 2.2 miles from SE 
Visibility : 10 km Precipitation (rainfall) : 0 mm Cloud (%) : 74 |
15-day weather forecast for Great Falls International Airport, Great Falls, United States
| Date | Weather forecast | Low temperature | High temperature | Average Temperature | Humidity | Wind | Chance of rain |
|---|---|---|---|---|---|---|---|
| 17 September 2026 Thu |  Sunny |
9.4 ° C | 22.6 ° C | 15.6 ° C | % 50 | 12.2 km/h | 4% |
| 18 September 2026 Fri |  Partly Cloudy |
13.2 ° C | 23.4 ° C | 17.5 ° C | % 57 | 17.6 km/h | 36% |
| 19 September 2026 Sat |  Patchy rain nearby |
13.5 ° C | 22 ° C | 16.8 ° C | % 63 | 14.8 km/h | 45% |
| 20 September 2026 Sun | Sunny |
11.6 ° C | 24.9 ° C | 17.5 ° C | % 51 | 13.3 km/h | 2% |
| 21 September 2026 Mon | Sunny |
12.2 ° C | 27.3 ° C | 18.7 ° C | % 36 | 27 km/h | 3% |
| 22 September 2026 Tue | Sunny |
6.1 ° C | 16.2 ° C | 12.2 ° C | % 41 | 22.7 km/h | 2% |
| 23 September 2026 Wed | Sunny |
7.9 ° C | 22.7 ° C | 14.8 ° C | % 33 | 17.3 km/h | 4% |
| 24 September 2026 Thu | Sunny |
11.4 ° C | 26.4 ° C | 18.4 ° C | % 36 | 8.3 km/h | 2% |
| 25 September 2026 Fri | Sunny |
14.5 ° C | 31.4 ° C | 22.3 ° C | % 28 | 25.9 km/h | 3% |
| 26 September 2026 Sat |  Overcast |
16.7 ° C | 30.4 ° C | 21.1 ° C | % 34 | 20.5 km/h | 6% |
| 27 September 2026 Sun | Sunny |
10.6 ° C | 20.7 ° C | 16.2 ° C | % 40 | 30.2 km/h | 3% |
| 28 September 2026 Mon | Overcast |
5.3 ° C | 10.2 ° C | 7.8 ° C | % 54 | 18.4 km/h | 36% |
| 29 September 2026 Tue | Overcast |
2.6 ° C | 12.2 ° C | 7.3 ° C | % 61 | 12.2 km/h | 13% |
| 30 September 2026 Wed | Sunny |
4.2 ° C | 15.8 ° C | 9.3 ° C | % 61 | 11.2 km/h | 7% |
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