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United States weather

Weather in Gallatin County, Montana for May 2026

Your guide to Gallatin County weather in May - trends and predictions

    Temperatures

  • An exceptional deviation from the historical average is forecasted for first days of May 2026 in Gallatin County with the forecasted temperature being 8.5 °F, much lower than usual.

  • In general, the average temperature in Gallatin County at the beginning of May is 12.7 °F. As the month progressed, temperatures tended to significantly warm up, reaching an average of 21.6 °F by the end of May.

    • Rain 🌧️

  • The climate of Gallatin County in May is notably wet, with an average of 15 rainy days, and a total of 69.8 mm of precipitation.

    • More

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

Average dry days
16
Dry days
Average rainy days
15
Rainy days
Average snowy days
0
Snow days
Average temperatures
16°/4°
Temperatures
Average wind speed
14 km/h
Avg max wind
Average humidity
66 %
Avg humidity

Gallatin County Weather May

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

Temperatures trend during May in Gallatin County

See the weather trend as well as the moving average line

May weather in Gallatin County day by day

Click on a date for more information
April June
Date Weather Temperatures Rain UV More
May 1 Sunny
Sunny
 8° /-7° 0 mm 2
May 2 Sunny
Sunny
 14° /-2° 0 mm 3
May 3 Partly cloudy
Partly cloudy
 20° /5° 0 mm 6
May 4 Moderate or heavy rain shower
Moderate or heavy rain shower
 17° /5° 9.3 mm 4
May 5 Moderate or heavy rain shower
Moderate or heavy rain shower
 5° /0° 21.2 mm 2
May 6 Cloudy
Cloudy
 7° /0° 0.7 mm 2
May 7 Overcast
Overcast
 18° /0° 0 mm 4
May 8 Sunny
Sunny
 20° /6° 0 mm 6
May 9 Sunny
Sunny
 21° /6° 0 mm 6
May 10 Sunny
Sunny
 26° /8° 0 mm 7
May 11 Patchy rain possible
Patchy rain possible
 22° /11° 0.6 mm 5
May 12 Overcast
Overcast
 21° /6° 0.3 mm 5
May 13 Moderate rain at times
Moderate rain at times
 9° /3° 6.9 mm 2
May 14 Patchy rain possible
Patchy rain possible
 7° /2° 6.4 mm 2
May 15 Patchy rain possible
Patchy rain possible
 8° /2° 1.9 mm 2
May 16 Patchy rain possible
Patchy rain possible
 11° /0° 0.5 mm 3
May 17 Moderate or heavy rain shower
Moderate or heavy rain shower
 15° /4° 3.8 mm 4
May 18 Heavy rain at times
Heavy rain at times
 8° /3° 12.8 mm 2
May 19 Overcast
Overcast
 11° /0° 0.1 mm 3
May 20 Patchy rain possible
Patchy rain possible
 11° /1° 0.8 mm 3
May 21 Patchy rain possible
Patchy rain possible
 12° /0° 0.7 mm 3
May 22 Heavy rain at times
Heavy rain at times
 15° /3° 2.8 mm 4
May 23 Moderate rain at times
Moderate rain at times
 15° /2° 1 mm 4
May 24 Partly cloudy
Partly cloudy
 17° /3° 0 mm 5
May 25 Mist
Mist
 18° /2° 0 mm 4
May 26 Sunny
Sunny
 22° /3° 0 mm 6
May 27 Thundery outbreaks possible
Thundery outbreaks possible
 18° /9° 0 mm 4
May 28 Sunny
Sunny
 21° /8° 0 mm 6
May 29 Partly cloudy
Partly cloudy
 25° /6° 0 mm 7
May 30 Mist
Mist
 20° /10° 0 mm 5
May 31 Sunny
Sunny
 27° /9° 0 mm 7
Next
Important Notice
Our weather forecast for Gallatin 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 Gallatin County forecast closer to your planned date for the most up-to-date weather information.
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Gallatin County in May - FAQ

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

During May, expect a variety of temperatures with highs around 16° and lows near 4°, suitable for diverse activities and preferences.

How much rainfall should be expected in Gallatin County during May?

Moderate rainfall is anticipated in Gallatin County during May, with a total of 69.8 mm spread over approximately 15 days. Considering plans for rainy days is advisable.

What are the typical wind conditions in Gallatin County during May?

The average wind speed in Gallatin County during May is 14 km/h, suggesting breezy to windy conditions, depending on your activities.

May rainfall patterns in Gallatin County

Explore the daily rainfall trends and prepare for Gallatin Countys May weather 💧
Typically, Gallatin County has 15 rainy days in May with a total of 69.8 mm of rainfall.

UV exposure in Gallatin County during May

Stay informed about UV levels for safe outdoor activities throughout the month of May ☀️
Top locations in Gallatin County
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Bozeman
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Location coordinates Where is Gallatin County?

Get accurate weather forecasts for Gallatin County, located at latitude 45.68 and longitude -111.039. Stay updated with localized weather information tailored for Gallatin County.

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