Helena (MT)
August
Weather in Helena, Montana for August 2026
Your guide to Helena weather in August - trends and predictions
So far, August 2026 in Helena shows a warmer trend than usual by 2.3 °F.
The forecast for the upcoming days in Helena predicts a temperature of 28.6 °F, which is slightly above the historical average.
In general, the average temperature in Helena at the beginning of August is 27.3 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 24.1 °F by the end of August.
With an average of 4 rainy days, Helena experiences minimal rainfall in August.
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Temperatures
Rain 🌧️
More
27
Dry days
4
Rainy days
0
Snow days
26°/11°
Temperatures
18 km/h
Avg max wind
49 %
Avg humidity
Helena Weather August
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Temperatures trend during August in Helena
See the weather trend as well as the moving average line
August weather in Helena day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Aug. 1 |  Thundery outbreaks possible | 33° /14° | 0 mm | 9 | |
| Aug. 2 |  Overcast | 26° /14° | 0 mm | 8 | |
| Aug. 3 |  Sunny | 24° /11° | 0.2 mm | 9 | |
| Aug. 4 |  Heavy rain at times | 23° /8° | 5.2 mm | 8 | |
| Aug. 5 |  Cloudy | 27° /8° | 2.5 mm | 8 | |
| Aug. 6 |  Partly cloudy | 30° /11° | 0 mm | 9 | |
| Aug. 7 | Thundery outbreaks possible | 28° /12° | 0 mm | 8 | |
| Aug. 8 | Overcast | 25° /10° | 0 mm | 7 | |
| Aug. 9 | Sunny | 33° /15° | 0 mm | 6.4 | |
| Aug. 10 | Sunny | 33° /11° | 0 mm | 5.7 | |
| Aug. 11 | Sunny | 33° /12° | 0 mm | 6.4 | |
| Aug. 12 | Sunny | 27° /10° | 0 mm | 6.6 | |
| Aug. 13 | Sunny | 23° /9° | 0 mm | 6 | |
| Aug. 14 | Cloudy | 19° /8° | 0 mm | 5 | |
| Aug. 15 | Sunny | 26° /5° | 3.7 mm | 7 | |
| Aug. 16 | Sunny | 30° /10° | 0 mm | 8 | |
| Aug. 17 | Sunny | 31° /13° | 0.3 mm | 8 | |
| Aug. 18 | Sunny | 30° /11° | 0 mm | 8 | |
| Aug. 19 | Sunny | 29° /13° | 0 mm | 7 | |
| Aug. 20 |  Patchy rain possible | 27° /13° | 0.6 mm | 7 | |
| Aug. 21 | Sunny | 28° /11° | 0.6 mm | 7 | |
| Aug. 22 | Sunny | 31° /13° | 0 mm | 8 | |
| Aug. 23 | Sunny | 26° /8° | 0 mm | 7 | |
| Aug. 24 | Partly cloudy | 26° /9° | 0 mm | 7 | |
| Aug. 25 | Sunny | 27° /12° | 0 mm | 7 | |
| Aug. 26 | Cloudy | 29° /14° | 0 mm | 6 | |
| Aug. 27 | Overcast | 23° /12° | 1.3 mm | 5 | |
| Aug. 28 | Heavy rain at times | 14° /11° | 20.4 mm | 3 | |
| Aug. 29 | Sunny | 23° /10° | 0 mm | 6 | |
| Aug. 30 | Sunny | 26° /10° | 0 mm | 7 | |
| Aug. 31 | Sunny | 27° /11° | 0 mm | 7 | |
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Important Notice
Our weather forecast for Helena in August 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.
Change Month
Helena in August - FAQ
What are the expected maximum and minimum temperatures in Helena during August?
Enjoy moderate daytime temperatures of up to 26° and cooler nights around 11°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Helena during August?
In August, Helena can expect light to moderate rainfall, totaling 37.3 mm across approximately 4 days. Occasional showers are possible, and planning ahead for them could be helpful.
What are the typical wind conditions in Helena during August?
The average wind speed in Helena during August is 18 km/h, suggesting breezy to windy conditions, depending on your activities.
August rainfall patterns in Helena
Explore the daily rainfall trends and prepare for Helenas August weather 💧
Typically, Helena has 4 rainy days in August with a total of 37.3 mm of rainfall.
UV exposure in Helena during August
Stay informed about UV levels for safe outdoor activities throughout the month of August ☀️
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