Helena (Montana) in may: average Weather, Temperature and Climate
Weather in Helena (Montana) in may 2025
The weather in Helena (Montana) in the month of may comes from statistical datas on the past years. You can view the weather statistics for the whole month, but also navigating through the tabs for the beginning, the middle and the end of the month.
Average weather throughout may
very bad weather 166.6cm
Weather at 6am
36°F
Clear/Sunny
39% of time
24%
11%
11%
Weather at 12pm
56°F
Clear/Sunny
43% of time
27%
12%
9%
Weather at 6pm
59°F
Clear/Sunny
36% of time
23%
19%
12%
Weather at 3am
43°F
41%
21%
12%
9%
Evolution of daily average temperature and precipitation in Helena (Montana) in may
These charts show the evolution of average minimum/maximum temperatures as well as average daily precipitation volume in Helena (Montana) in may.
The climate of Helena (Montana) in may is very bad
In may in Helena (Montana), the climate is wet (with 4.1in of precipitation over 6 days). The weather is worst than the previous month since in april there is an average of 3.4in of rainfall over 6 days.
The climate is relatively cool in that locality this month, but it is tolerable by dressing cosy. The high seasonal norm is 61°F. In the morning the temperature drops to 36°F. Thus, the mean temperature average on this month of may in Helena (Montana) is 49°F. Note that seasonal normals in contrast with those observed in Helena (Montana) in may with a maximum record of 83°F in 2009 and a minimum record of 9°F in 2009. You need to prepare to have about 12 days with temperatures down below 32°F, or 39% of the month.
On this month of may, day length in Helena (Montana) is generally 15:02. Sunrise is at 04:54 and sunset is at 19:56.
May: another location in the United States (USA)?
If you want to go to the United States (USA) in may, there are destinations with better weather than Helena (Montana):
In may, California, Hawaii (Honolulu), Las Vegas, Phoenix (Arizona), Amarillo (Texas) and Big Bend National Park (Texas) have perfect weather.
Furthermore, Louisiana, Washington D. C., Atlanta, Boston, Chicago and Dallas have good weather.
Finally, Salt Lake City, Denver, Long Beach (Washington), Santa Fe (New Mexico), Boise (Idaho) and Bryce Canyon have a tolerable climate, but better than Helena (Montana).
Seasonal average climate and temperature of Helena (Montana) in may
Check below seasonal norms These datas are set from the weather statements of the last years of may.
| May | |||||
| Outside temperature | |||||
| Average temperature | 49°F | ||||
| Highest temperature | 61°F | ||||
| Lowest temperature | 36°F | ||||
| Highest record temperature | 83°F (2009) | ||||
| Lowest record temperature | 9°F (2009) | ||||
| Number of days at +86°F | 0 day(s) (0%) | ||||
| Number of days at +65°F | 11 day(s) (35%) | ||||
| Number of days at -32°F | 12 day(s) (39%) | ||||
| Wind | |||||
| Wind speed | 14km/h | ||||
| Wind temperature | 32°F | ||||
| Precipitation (rainfall) | |||||
| Rainfall | 4.1in | ||||
| Number of days with rainfall | 6 day(s) (19%) | ||||
| Record daily rainfall | 1.9in (2021) | ||||
| Snowfall | 166.6cm | ||||
| Other climate data | |||||
| Humidity | 83% | ||||
| Visibility | 9.03km | ||||
| Cloud cover | 33% | ||||
| UV index | 4 | ||||
| Daily sunshine hours | 14 | ||||
| Sunrise and sunset | |||||
| Time of sunrise | 04:54 | ||||
| Time of sunset | 19:56 | ||||
| Length of day | 15:02 | ||||
| Our opinion about the weather in may | |||||
| Our opinion at whereandwhen.net | very bad | ||||
How was the weather last may?
Here is the day by day recorded weather in Helena (Montana) in may 2024:
25°F to 41°F
31°F to 38°F
25°F to 50°F
31°F to 58°F
40°F to 59°F
38°F to 45°F
32°F to 34°F
32°F to 36°F
34°F to 47°F
32°F to 59°F
41°F to 67°F
47°F to 70°F
47°F to 65°F
43°F to 56°F
41°F to 65°F
45°F to 68°F
45°F to 50°F
32°F to 56°F
36°F to 47°F
31°F to 52°F
34°F to 56°F
41°F to 43°F
31°F to 45°F
32°F to 56°F
38°F to 52°F
38°F to 54°F
38°F to 65°F
47°F to 72°F
47°F to 54°F
34°F to 54°F
34°F to 61°F
Map: other cities in the United States (USA) in may
Cities near Helena (Montana):
| Montana in may | very bad weather |
| Yellowstone National Park in may | very bad weather |
| Glacier National Park (Montana) in may | very bad weather |
| Cody (Wyoming) in may | very bad weather |
| Grand Teton National Park (Wyoming) in may | very bad weather |
| Jackson Hole in may | very bad weather |
| Boise (Idaho) in may | tolerable weather |
| Wyoming in may | tolerable weather |
| Salt Lake City in may | tolerable weather |
| Mount Rushmore in may | tolerable weather |
| Mount Rainier National Park (Washington) in may | very bad weather |
| Seattle in may | good weather |
Click over cities on the map for information about the weather in may.
Helena (Montana)
perfect weather
good
tolerable
bad
very bad
Weather data for Helena (Montana) in may:
Weather data for Helena (Montana) for may are derived from an average of the weather forecast since 2009 in Helena (Montana). There is a margin of error and these forecasts are to be considered as general information only. The weather in Helena (Montana) can vary slightly from year to year, but this data should limit surprises. So you can pack your bags or check for the best time in year to go to Helena (Montana).