Great Falls (MT)
May
Weather in Great Falls, Montana for May 2027
Your guide to Great Falls weather in May - trends and predictions
In general, the average temperature in Great Falls at the beginning of May is 18.6 °C. As the month progressed, temperatures tended to significantly warm up, reaching an average of 25.7 °C by the end of May.
The climate of Great Falls in May is notably wet, with an average of 12 rainy days, and a total of 48.1 mm of precipitation.
New! Chat with our AI weatherman - it’s amazing and free.
Temperatures
Rain 🌧️
More
19
Dry days
12
Rainy days
0
Snow days
20°/6°
Temperatures
22 km/h
Avg max wind
55 %
Avg humidity
Great Falls Weather May
Move between months or click on a day
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
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| May 1 |  Patchy rain possible | 21° /5° | 0.1 mm | 7 | |
| May 2 |  Sunny | 22° /7° | 0 mm | 7 | |
| May 3 | Sunny | 24° /6° | 0 mm | 7 | |
| May 4 |  Overcast | 15° /5° | 2.3 mm | 5 | |
| May 5 |  Heavy rain at times | 11° /3° | 9.2 mm | 5 | |
| May 6 |  Partly cloudy | 17° /0° | 0.2 mm | 8 | |
| May 7 | Overcast | 20° /7° | 0.6 mm | 6 | |
| May 8 |  Cloudy | 23° /7° | 0.1 mm | 8 | |
| May 9 | Sunny | 20° /7° | 2.7 mm | 6 | |
| May 10 |  Moderate rain at times | 27° /8° | 0.3 mm | 7 | |
| May 11 | Patchy rain possible | 23° /11° | 0.3 mm | 7 | |
| May 12 | Patchy rain possible | 22° /8° | 0.1 mm | 8 | |
| May 13 | Patchy rain possible | 22° /10° | 2.7 mm | 6 | |
| May 14 | Moderate or heavy rain shower | 14° /7° | 4.7 mm | 6 | |
| May 15 | Moderate or heavy rain shower | 14° /7° | 2.5 mm | 5 | |
| May 16 | Patchy rain possible | 14° /6° | 0.2 mm | 3 | |
| May 17 | Partly cloudy | 12° /3° | 3.5 mm | 6 | |
| May 18 | Heavy rain at times | 11° /2° | 5.8 mm | 5 | |
| May 19 | Overcast | 16° /4° | 1 mm | 6 | |
| May 20 | Moderate rain at times | 14° /4° | 3.1 mm | 7 | |
| May 21 | Patchy rain possible | 15° /3° | 0.1 mm | 8 | |
| May 22 | Overcast | 18° /4° | 4.2 mm | 6 | |
| May 23 | Patchy rain possible | 19° /7° | 4.9 mm | 6 | |
| May 24 | Cloudy | 23° /7° | 0 mm | 8 | |
| May 25 | Sunny | 27° /7° | 0 mm | 9 | |
| May 26 |  Mist | 28° /9° | 0.2 mm | 9 | |
| May 27 | Cloudy | 26° /12° | 0.1 mm | 9 | |
| May 28 | Partly cloudy | 27° /11° | 0 mm | 9 | |
| May 29 | Mist | 29° /9° | 0.4 mm | 9 | |
| May 30 | Cloudy | 22° /12° | 4.8 mm | 8 | |
| May 31 | Sunny | 21° /7° | 13.8 mm | 6 | |
| 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.
Change Month
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?
In May, Great Falls can expect light to moderate rainfall, totaling 48.1 mm across approximately 12 days. Occasional showers are possible, and planning ahead for them could be helpful.
What are the typical wind conditions in Great Falls during May?
The average wind speed in Great Falls during May is 22 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 12 rainy days in May with a total of 48.1 mm of rainfall.
UV exposure in Great Falls during May
Stay informed about UV levels for safe outdoor activities throughout the month of May ☀️
Quick links
More Great Falls weather pages
You are here
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.
Found a mistake?
We appreciate your attention to details. Tell us here.