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Weather in Montana for May 2026

Your guide to Montana weather in May - trends and predictions

    Temperatures

  • In general, the average temperature in Montana at the beginning of May is 19.4 °F. As the month progressed, temperatures tended to significantly warm up, reaching an average of 25 °F by the end of May.

    • Rain 🌧️

  • The climate of Montana in May is notably wet, with an average of 12 rainy days, and a total of 93.5 mm of precipitation.

    • More

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Average dry days
19
Dry days
Average rainy days
12
Rainy days
Average snowy days
0
Snow days
Average temperatures
21°/6°
Temperatures
Average wind speed
20 km/h
Avg max wind
Average humidity
65 %
Avg humidity

Montana Weather May

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

What’s the Weather Like in Montana This May?

Discover the average temperatures and weather trends across Montana’s cities this May.
Patchy rain possibleBillings21 °F / 6 °FPatchy rain possibleGlacier National Park18 °F / 6 °FPatchy rain possibleBozeman16 °F / 4 °FPatchy rain possibleMissoula19 °F / 7 °FSunnyHelena18 °F / 4 °FPatchy rain possibleButte16 °F / 2 °FPatchy rain possibleGreat Falls20 °F / 6 °FMore Locations

Temperatures trend during May in Montana

See the weather trend as well as the moving average line

May weather in Montana day by day

Click on a date for more information
April June
Date Weather Temperatures Rain UV More
May 1 Moderate rain at times
Moderate rain at times
 18° /3° 1.2 mm 4
May 2 Partly cloudy
Partly cloudy
 22° /1° 0 mm 6
May 3 Sunny
Sunny
 26° /7° 0 mm 7
May 4 Partly cloudy
Partly cloudy
 27° /6° 0 mm 7
May 5 Heavy rain at times
Heavy rain at times
 12° /4° 9.6 mm 3
May 6 Patchy rain possible
Patchy rain possible
 9° /4° 1.7 mm 2
May 7 Overcast
Overcast
 22° /3° 0 mm 5
May 8 Sunny
Sunny
 26° /7° 0 mm 7
May 9 Overcast
Overcast
 26° /9° 0 mm 6
May 10 Partly cloudy
Partly cloudy
 30° /7° 0 mm 8
May 11 Overcast
Overcast
 28° /14° 0 mm 6
May 12 Patchy rain possible
Patchy rain possible
 29° /10° 0.3 mm 6
May 13 Patchy rain possible
Patchy rain possible
 18° /7° 12.8 mm 4
May 14 Moderate or heavy rain shower
Moderate or heavy rain shower
 13° /7° 24.6 mm 3
May 15 Moderate or heavy rain shower
Moderate or heavy rain shower
 14° /6° 6.1 mm 3
May 16 Patchy rain possible
Patchy rain possible
 16° /6° 0.2 mm 4
May 17 Patchy rain possible
Patchy rain possible
 20° /5° 0.5 mm 5
May 18 Moderate or heavy rain shower
Moderate or heavy rain shower
 16° /8° 20.2 mm 4
May 19 Heavy rain at times
Heavy rain at times
 12° /5° 10.4 mm 3
May 20 Moderate rain at times
Moderate rain at times
 17° /5° 1.1 mm 4
May 21 Moderate rain at times
Moderate rain at times
 18° /4° 1 mm 4
May 22 Overcast
Overcast
 22° /3° 1.2 mm 5
May 23 Patchy rain possible
Patchy rain possible
 20° /7° 0.1 mm 5
May 24 Moderate or heavy rain shower
Moderate or heavy rain shower
 17° /7° 2.5 mm 4
May 25 Mist
Mist
 21° /3° 0 mm 5
May 26 Overcast
Overcast
 23° /4° 0 mm 5
May 27 Mist
Mist
 25° /6° 0 mm 6
May 28 Sunny
Sunny
 24° /13° 0 mm 6
May 29 Mist
Mist
 26° /7° 0 mm 6
May 30 Sunny
Sunny
 26° /11° 0 mm 7
May 31 Sunny
Sunny
 30° /10° 0 mm 8
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Important Notice
Our weather forecast for Montana in May 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 Montana forecast closer to your planned date for the most up-to-date weather information.
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Montana in May - FAQ

What are the expected maximum and minimum temperatures in Montana during May?

Enjoy moderate daytime temperatures of up to 21° and cooler nights around 6°. Ideal for a range of outdoor activities, from hiking to city tours.

How much rainfall should be expected in Montana during May?

Moderate rainfall is anticipated in Montana during May, with a total of 93.5 mm spread over approximately 12 days. Considering plans for rainy days is advisable.

What are the typical wind conditions in Montana during May?

The average wind speed in Montana during May is 20 km/h, suggesting breezy to windy conditions, depending on your activities.

May rainfall patterns in Montana

Explore the daily rainfall trends and prepare for Montanas May weather 💧
Typically, Montana has 12 rainy days in May with a total of 93.5 mm of rainfall.

UV exposure in Montana during May

Stay informed about UV levels for safe outdoor activities throughout the month of May ☀️
Counties in Montana
Select a county for an accurate weather forecast
Cascade CountyFlathead CountyGallatin CountyLewis and Clark CountyMissoula CountySilver Bow CountyYellowstone County
Top locations in Montana
Select a location for an accurate weather forecast
BillingsBozemanButteGlacier National ParkGreat FallsHelenaMissoula
More Locations

Quick links

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Location coordinates Where is Montana?

Get accurate weather forecasts for Montana, located at latitude 45.783 and longitude -108.501. Stay updated with localized weather information tailored for Montana.

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