Flathead County (Glacier National Park)
May
Weather in Flathead County, Montana for May 2026
Your guide to Flathead County weather in May - trends and predictions
In general, the average temperature in Flathead County at the beginning of May is 18.6 °F. As the month progressed, temperatures tended to significantly warm up, reaching an average of 23 °F by the end of May.
The climate of Flathead County in May is notably wet, with an average of 15 rainy days, and a total of 60 mm of precipitation.
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Temperatures
Rain 🌧️
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16
Dry days
15
Rainy days
0
Snow days
18°/6°
Temperatures
12 km/h
Avg max wind
58 %
Avg humidity
Flathead County Weather May
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Temperatures trend during May in Flathead County
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May weather in Flathead County day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| May 1 |  Partly cloudy | 18° /2° | 0 mm | 5 | |
| May 2 |  Sunny | 23° /3° | 0 mm | 6 | |
| May 3 | Sunny | 24° /6° | 0 mm | 6 | |
| May 4 |  Patchy rain possible | 12° /7° | 3.3 mm | 3 | |
| May 5 | Patchy rain possible | 15° /4° | 0.9 mm | 4 | |
| May 6 | Sunny | 17° /0° | 0 mm | 5 | |
| May 7 | Partly cloudy | 21° /4° | 0 mm | 6 | |
| May 8 | Patchy rain possible | 18° /9° | 1.1 mm | 4 | |
| May 9 |  Cloudy | 23° /5° | 0 mm | 5 | |
| May 10 |  Overcast | 24° /10° | 0 mm | 5 | |
| May 11 | Patchy rain possible | 18° /9° | 6.5 mm | 4 | |
| May 12 |  Moderate or heavy rain shower | 14° /7° | 11.2 mm | 3 | |
| May 13 | Moderate or heavy rain shower | 14° /5° | 2.4 mm | 3 | |
| May 14 | Moderate or heavy rain shower | 13° /5° | 6.8 mm | 3 | |
| May 15 | Moderate rain at times | 12° /7° | 4.2 mm | 3 | |
| May 16 | Moderate rain at times | 14° /4° | 1.7 mm | 3 | |
| May 17 | Cloudy | 16° /5° | 0 mm | 4 | |
| May 18 | Moderate or heavy rain shower | 11° /6° | 5.8 mm | 3 | |
| May 19 | Overcast | 13° /3° | 0.1 mm | 3 | |
| May 20 | Moderate or heavy rain shower | 12° /4° | 1.9 mm | 3 | |
| May 21 | Moderate or heavy rain shower | 12° /4° | 7.1 mm | 3 | |
| May 22 | Overcast | 16° /3° | 0 mm | 4 | |
| May 23 | Patchy rain possible | 16° /7° | 1.5 mm | 4 | |
| May 24 | Sunny | 21° /6° | 0 mm | 6 | |
| May 25 | Sunny | 26° /9° | 0 mm | 7 | |
| May 26 | Sunny | 24° /12° | 0 mm | 6 | |
| May 27 | Partly cloudy | 22° /11° | 0 mm | 6 | |
| May 28 | Sunny | 26° /11° | 0 mm | 7 | |
| May 29 |  Thundery outbreaks possible | 27° /14° | 4.3 mm | 6 | |
| May 30 | Moderate rain at times | 18° /6° | 0.6 mm | 5 | |
| May 31 | Sunny | 18° /0° | 0 mm | 5 | |
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Important Notice
Our weather forecast for Flathead County 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 Flathead County forecast closer to your planned date for the most up-to-date weather information.
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Flathead County in May - FAQ
What are the expected maximum and minimum temperatures in Flathead County during May?
Enjoy moderate daytime temperatures of up to 18° and cooler nights around 6°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Flathead County during May?
Moderate rainfall is anticipated in Flathead County during May, with a total of 60 mm spread over approximately 15 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Flathead County during May?
The average wind speed in Flathead County during May is 12 km/h, suggesting breezy to windy conditions, depending on your activities.
May rainfall patterns in Flathead County
Explore the daily rainfall trends and prepare for Flathead Countys May weather 💧
UV exposure in Flathead County during May
Stay informed about UV levels for safe outdoor activities throughout the month of May ☀️
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