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Lewis and Clark County (Helena)
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Weather in Lewis and Clark County, Montana for October 2026

Your guide to Lewis and Clark County weather in October - trends and predictions

    Snow Forecast ❄️

  • With an average of 4 snowy days, Lewis and Clark County usually enjoys a light touch of snow in October.
    According to Lewis and Clark County snow forecast for October 2026, no snow is expected at the beginning of the month.

    • Temperatures

  • The forecast for the first days of October 2026 in Lewis and Clark County predicts temperatures to be around 19 °F, close to the historical average.

  • In general, the average temperature in Lewis and Clark County at the beginning of October is 19.1 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 8 °F by the end of October.

    • More

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Average dry days
23
Dry days
Average rainy days
4
Rainy days
Average snowy days
4
Snow days
Average temperatures
11°/0°
Temperatures
Average wind speed
16 km/h
Avg max wind
Average humidity
62 %
Avg humidity

Lewis and Clark County Weather October

Move between months or click on a day
September
November
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Overcast
17°
2
Overcast
21°
3
Sunny
18°
4
Partly cloudy
18°
5
Overcast
21°
6
Sunny
22°
7
Sunny
17°
8
Sunny
19°
9
Sunny
22°
10
Overcast
17°
11
Sunny
16°
12
Sunny
21°
13
Heavy snow
0°
14
Mist
4°
15
Heavy snow
3°
16
Overcast
9°
17
Overcast
11°
18
Overcast
9°
19
Moderate rain at times
9°
20
Cloudy
8°
21
Sunny
14°
22
Sunny
16°
23
Cloudy
13°
24
Overcast
17°
25
Overcast
13°
26
Partly cloudy
7°
27
Overcast
4°
28
Patchy rain possible
8°
29
Partly cloudy
9°
30
Sunny
7°
31
Overcast
8°

Temperatures trend during October in Lewis and Clark County

See the weather trend as well as the moving average line

October weather in Lewis and Clark County day by day

Click on a date for more information
September November
Date Weather Temperatures Rain Snow More
Oct. 1 Overcast
Overcast
 17° /5° 0 mm 0 cm
Oct. 2 Overcast
Overcast
 21° /10° 0 mm 0 cm
Oct. 3 Sunny
Sunny
 18° /7° 0 mm 0 cm
Oct. 4 Partly cloudy
Partly cloudy
 18° /7° 0 mm 0 cm
Oct. 5 Overcast
Overcast
 21° /8° 0 mm 0 cm
Oct. 6 Sunny
Sunny
 22° /10° 0 mm 0 cm
Oct. 7 Sunny
Sunny
 17° /7° 0 mm 0 cm
Oct. 8 Sunny
Sunny
 19° /4° 0 mm 0 cm
Oct. 9 Sunny
Sunny
 22° /9° 0 mm 0 cm
Oct. 10 Overcast
Overcast
 17° /7° 0 mm 0 cm
Oct. 11 Sunny
Sunny
 16° /3° 0 mm 0 cm
Oct. 12 Sunny
Sunny
 21° /7° 0 mm 0 cm
Oct. 13 Heavy snow
Heavy snow
 0° /-5° 32.2 mm 23.3 cm
Oct. 14 Mist
Mist
 4° /-2° 2.2 mm 0 cm
Oct. 15 Heavy snow
Heavy snow
 3° /0° 33.4 mm 9.9 cm
Oct. 16 Overcast
Overcast
 9° /1° 0 mm 0 cm
Oct. 17 Overcast
Overcast
 11° /0° 0 mm 0 cm
Oct. 18 Overcast
Overcast
 9° /-1° 0 mm 0 cm
Oct. 19 Moderate rain at times
Moderate rain at times
 9° /2° 3.6 mm 0 cm
Oct. 20 Cloudy
Cloudy
 8° /0° 0 mm 0 cm
Oct. 21 Sunny
Sunny
 14° /0° 0 mm 0 cm
Oct. 22 Sunny
Sunny
 16° /0° 0 mm 0 cm
Oct. 23 Cloudy
Cloudy
 13° /2° 0 mm 0 cm
Oct. 24 Overcast
Overcast
 17° /1° 0 mm 0 cm
Oct. 25 Overcast
Overcast
 13° /3° 0 mm 0 cm
Oct. 26 Partly cloudy
Partly cloudy
 7° /1° 0 mm 0 cm
Oct. 27 Overcast
Overcast
 4° /-5° 0 mm 0 cm
Oct. 28 Patchy rain possible
Patchy rain possible
 8° /-3° 0.2 mm 0 cm
Oct. 29 Partly cloudy
Partly cloudy
 9° /-3° 0 mm 0 cm
Oct. 30 Sunny
Sunny
 7° /-5° 0 mm 0 cm
Oct. 31 Overcast
Overcast
 8° /-5° 0 mm 0 cm
Next
Important Notice
Our weather forecast for Lewis and Clark County in October 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 Lewis and Clark County forecast closer to your planned date for the most up-to-date weather information.
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Lewis and Clark County in October - FAQ

What are the expected maximum and minimum temperatures in Lewis and Clark County during October?
Prepare for cooler days with highs just around 11° and colder nights, dipping below 0°.

How much rainfall should be expected in Lewis and Clark County during October?
Significant rainfall exceeding 129.9 mm is expected in Lewis and Clark County during October, occurring over more than 4 days. Preparing for wet conditions is recommended in your planning.

Will it snow in Lewis and Clark County in October 2026?
Lewis and Clark County experiences an average snowfall of 43.4 cm during October, occurring over 4 days.

What are the typical wind conditions in Lewis and Clark County during October?
The average wind speed in Lewis and Clark County during October is 16 km/h, suggesting breezy to windy conditions, depending on your activities.

Lewis and Clark County snow forecast October 2026

Track daily snowfall levels and discover Lewis and Clark County’s snowy potential this October ❄️
On average, Lewis and Clark County sees 4 snowy days during October, with approximately 43.4 cm of total snowfall.

October rainfall patterns in Lewis and Clark County

Explore the daily rainfall trends and prepare for Lewis and Clark Countys October weather 💧
Typically, Lewis and Clark County has 4 rainy days in October with a total of 129.9 mm of rainfall.

UV exposure in Lewis and Clark County during October

Stay informed about UV levels for safe outdoor activities throughout the month of October ☀️
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Helena
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Location coordinates Where is Lewis and Clark County?

Get accurate weather forecasts for Lewis and Clark County, located at latitude 46.593 and longitude -112.036. Stay updated with localized weather information tailored for Lewis and Clark County.

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