Helena (MT)
September
Weather in Helena, Montana for September 2027
Your guide to Helena weather in September - trends and predictions
With an average of 5 rainy days, Helena experiences minimal rainfall in September.
Is September a good time to visit Helena? check out the best time to travel to Helena page.
✨ Is September a good time to visit Helena? – Ask the AI Weatherman
Rain 🌧️
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25
Dry days
5
Rainy days
0
Snow days
22°/8°
Temperatures
15 km/h
Avg max wind
51 %
Avg humidity
Helena Weather September
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Temperatures trend during September in Helena
See the weather trend as well as the moving average line
September weather in Helena day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Sunny | 30° /12° | 0.2 mm | 5 | |
| Sept. 2 |  Light rain | 29° /13° | 2.8 mm | 6 | |
| Sept. 3 | Sunny | 26° /10° | 0 mm | 5 | |
| Sept. 4 |  Partly cloudy | 22° /10° | 0 mm | 5 | |
| Sept. 5 | Sunny | 22° /7° | 0 mm | 6 | |
| Sept. 6 | Sunny | 24° /8° | 0 mm | 5 | |
| Sept. 7 |  Thundery outbreaks possible | 22° /9° | 35.9 mm | 4 | |
| Sept. 8 | Sunny | 21° /9° | 0 mm | 6.2 | |
| Sept. 9 | Thundery outbreaks possible | 24° /9° | 0 mm | 6 | |
| Sept. 10 | Thundery outbreaks possible | 28° /11° | 0 mm | 6 | |
| Sept. 11 |  Moderate rain | 21° /10° | 13.8 mm | 4 | |
| Sept. 12 | Thundery outbreaks possible | 20° /7° | 0 mm | 3 | |
| Sept. 13 |  Overcast | 20° /6° | 0.8 mm | 5.7 | |
| Sept. 14 | Partly cloudy | 19° /7° | 0.1 mm | 5.6 | |
| Sept. 15 | Overcast | 17° /6° | 0 mm | 5 | |
| Sept. 16 |  Cloudy | 19° /7° | 0 mm | 5.5 | |
| Sept. 17 | Sunny | 23° /7° | 0 mm | 5.4 | |
| Sept. 18 | Light rain | 23° /9° | 2.6 mm | 4 | |
| Sept. 19 | Light rain | 18° /9° | 7.9 mm | 3 | |
| Sept. 20 | Sunny | 23° /8° | 0 mm | 5.1 | |
| Sept. 21 | Moderate rain | 23° /8° | 10.4 mm | 5 | |
| Sept. 22 | Light rain | 20° /7° | 7.7 mm | 4 | |
| Sept. 23 | Sunny | 23° /7° | 0.1 mm | 4.8 | |
| Sept. 24 | Sunny | 26° /8° | 0 mm | 4.7 | |
| Sept. 25 | Sunny | 27° /10° | 0.2 mm | 4.6 | |
| Sept. 26 | Sunny | 17° /6° | 0 mm | 4.5 | |
| Sept. 27 | Sunny | 20° /3° | 0.1 mm | 4 | |
| Sept. 28 | Sunny | 22° /7° | 0.1 mm | 4.4 | |
| Sept. 29 |  Patchy rain possible | 24° /8° | 1.8 mm | 4 | |
| Sept. 30 | Cloudy | 20° /10° | 0.1 mm | 4 | |
| Next | |||||
Important Notice
Our weather forecast for Helena in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Helena forecast closer to your planned date for the most up-to-date weather information.
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Helena in September - FAQ
What are the expected maximum and minimum temperatures in Helena during September?
Enjoy moderate daytime temperatures of up to 22° and cooler nights around 8°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Helena during September?
Moderate rainfall is anticipated in Helena during September, with a total of 84.3 mm spread over approximately 5 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Helena during September?
The average wind speed in Helena during September is 15 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Helena
Explore the daily rainfall trends and prepare for Helenas September weather 💧
Typically, Helena has 5 rainy days in September with a total of 84.3 mm of rainfall.
UV exposure in Helena during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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