Boise weather in May
Temperature, rain and sunshine in May: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in May
Excellent
Best time to visit: May – June, September – October
What is the weather like in Boise in May?
In May, Boise is warm: daytime highs average 22 °C, and nights cool down to about 9 °C. With around 9 hours of sunshine a day, there is plenty of sun. Rain falls on about 6 days, adding up to 29 mm. All in all, May is an excellent month for a holiday in Boise.
May compared
How the weather changes from April to June. Tap a month to open it.
More details for May
- Daylight
- 14 h 41 min06:21 – 21:01
- UV index
- 9 · very highclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or moreAll months
- Wind
- 17 km/haverage daily peakAll months
- Cloud cover
- 49 %on averageAll months
- Hot days
- 2 days30 °C or moreAll months
- Snow days
- 0 days1 cm or more of fresh snowAll months
- Time zone
- UTC−6America/Boise
How the score comes together
- Temperatureweight 50 %100 %
- Sunshineweight 20 %100 %
- Few rainy daysweight 30 %86 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in May
- Sunscreen
- Sunglasses & sun hat
- A jumper for the evenings
Boise in May: quick answers
Is Boise hot in May?
Warm rather than hot: in May, daytime highs in Boise average 22 °C and nights cool to about 9 °C. On about 2 days the thermometer climbs to 30 °C or more.
Does it rain much in Boise in May?
Rain falls on about 6 days, adding up to 29 mm.
Boise month by month
The whole year in BoiseAll destinations: USAWhere to go in May
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences