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United States weather

Weather in Great Falls, Montana for May 2026

Your guide to Great Falls weather in May - trends and predictions

    Temperatures

  • In general, the average temperature in Great Falls at the beginning of May is 19.6 °F. As the month progressed, temperatures tended to significantly warm up, reaching an average of 26.7 °F by the end of May.

    • Rain 🌧️

  • The climate of Great Falls in May is notably wet, with an average of 13 rainy days, and a total of 70.2 mm of precipitation.

    • More

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
18
Dry days
Average rainy days
13
Rainy days
Average snowy days
0
Snow days
Average temperatures
20°/6°
Temperatures
Average wind speed
21 km/h
Avg max wind
Average humidity
60 %
Avg humidity

Great Falls Weather May

Move between months or click on a day
April
June
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Patchy rain possible
20°
2
Sunny
25°
3
Sunny
26°
4
Overcast
16°
5
Heavy rain at times
11°
6
Partly cloudy
14°
7
Overcast
25°
8
Cloudy
23°
9
Sunny
25°
10
Moderate rain at times
29°
11
Patchy rain possible
23°
12
Patchy rain possible
20°
13
Patchy rain possible
14°
14
Moderate or heavy rain shower
13°
15
Moderate or heavy rain shower
12°
16
Patchy rain possible
15°
17
Partly cloudy
18°
18
Heavy rain at times
12°
19
Overcast
15°
20
Moderate rain at times
15°
21
Patchy rain possible
15°
22
Overcast
16°
23
Patchy rain possible
15°
24
Cloudy
20°
25
Sunny
25°
26
Mist
26°
27
Cloudy
25°
28
Partly cloudy
25°
29
Mist
29°
30
Cloudy
25°
31
Sunny
32°

Temperatures trend during May in Great Falls

See the weather trend as well as the moving average line

May weather in Great Falls day by day

Click on a date for more information
April June
Date Weather Temperatures Rain UV More
May 1 Patchy rain possible
Patchy rain possible
 20° /5° 0.1 mm 7
May 2 Sunny
Sunny
 25° /7° 0 mm 7
May 3 Sunny
Sunny
 26° /5° 0 mm 7
May 4 Overcast
Overcast
 16° /6° 4.3 mm 6
May 5 Heavy rain at times
Heavy rain at times
 11° /4° 17.7 mm 4
May 6 Partly cloudy
Partly cloudy
 14° /0° 0 mm 8
May 7 Overcast
Overcast
 25° /5° 0 mm 8
May 8 Cloudy
Cloudy
 23° /8° 0 mm 8
May 9 Sunny
Sunny
 25° /5° 0 mm 8
May 10 Moderate rain at times
Moderate rain at times
 29° /9° 0.6 mm 5
May 11 Patchy rain possible
Patchy rain possible
 23° /10° 0.6 mm 5
May 12 Patchy rain possible
Patchy rain possible
 20° /10° 0.2 mm 8
May 13 Patchy rain possible
Patchy rain possible
 14° /8° 0.9 mm 3
May 14 Moderate or heavy rain shower
Moderate or heavy rain shower
 13° /6° 9.4 mm 3
May 15 Moderate or heavy rain shower
Moderate or heavy rain shower
 12° /6° 4.9 mm 2
May 16 Patchy rain possible
Patchy rain possible
 15° /5° 0.3 mm 3
May 17 Partly cloudy
Partly cloudy
 18° /5° 0 mm 9
May 18 Heavy rain at times
Heavy rain at times
 12° /5° 11.1 mm 1
May 19 Overcast
Overcast
 15° /6° 0.6 mm 4
May 20 Moderate rain at times
Moderate rain at times
 15° /4° 1.2 mm 8
May 21 Patchy rain possible
Patchy rain possible
 15° /3° 0.1 mm 8
May 22 Overcast
Overcast
 16° /4° 8.4 mm 3
May 23 Patchy rain possible
Patchy rain possible
 15° /7° 9.8 mm 4
May 24 Cloudy
Cloudy
 20° /4° 0 mm 9
May 25 Sunny
Sunny
 25° /4° 0 mm 9
May 26 Mist
Mist
 26° /5° 0 mm 9
May 27 Cloudy
Cloudy
 25° /11° 0 mm 9
May 28 Partly cloudy
Partly cloudy
 25° /9° 0 mm 9
May 29 Mist
Mist
 29° /6° 0 mm 9
May 30 Cloudy
Cloudy
 25° /13° 0 mm 9
May 31 Sunny
Sunny
 32° /7° 0 mm 9
Next
Important Notice
Our weather forecast for Great Falls 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 Great Falls forecast closer to your planned date for the most up-to-date weather information.
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Great Falls in May - FAQ

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

Enjoy moderate daytime temperatures of up to 20° and cooler nights around 6°. Ideal for a range of outdoor activities, from hiking to city tours.

How much rainfall should be expected in Great Falls during May?

Moderate rainfall is anticipated in Great Falls during May, with a total of 70.2 mm spread over approximately 13 days. Considering plans for rainy days is advisable.

What are the typical wind conditions in Great Falls during May?

The average wind speed in Great Falls during May is 21 km/h, suggesting breezy to windy conditions, depending on your activities.

May rainfall patterns in Great Falls

Explore the daily rainfall trends and prepare for Great Fallss May weather 💧
Typically, Great Falls has 13 rainy days in May with a total of 70.2 mm of rainfall.

UV exposure in Great Falls during May

Stay informed about UV levels for safe outdoor activities throughout the month of May ☀️

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Location coordinates Where is Great Falls?

Get accurate weather forecasts for Great Falls, located at latitude 47.5 and longitude -111.301. Stay updated with localized weather information tailored for Great Falls.

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