Boise Weather in May
With daytime temperatures of 22°C (72°F) and nighttime lows of 7°C (45°F), May in Boise brings high temperatures during the day. The perfect weather makes it an appealing time to visit.
Rainfall in Boise in May
Looking at the last 30 years, the data shows about 11 days with rain, averaging 33 mm (1.3 in) for the month. A fairly balanced picture this month, some wet days but nothing too extreme in terms of intensity.
Temperature in Boise in May
May is one of the better months to visit Boise. Expect 22°C (72°F) during the day and 7°C (45°F) at night. Overall, the month follows a fairly predictable daily temperature pattern. Nights fall to 7°C (45°F), which is cold enough to feel it indoors too. A good thick duvet makes all the difference for a comfortable night's sleep.
Sunshine in Boise in May
The days are predominantly sunny, with an estimated total of around 333 hours of sunshine. These sun-filled days are perfect for playing sports, visiting parks, or going for a bike ride.If you're inclined towards comfortable temperatures and drier conditions, May is a good time to visit Boise.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our Boise's climate page.
Boise Temperature in May
Min Temperature
7°C (45°F)
Max Temperature
22°C (72°F)
Chance of Rain
35%
Precipitation
33 mm (1.3 in)
Rainy days
11 days
Humidity
48%
Sunshine
333 hours
Percentage Sunshine
74%
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Boise typically rise from around 20°C (68°F) at the start of May to approximately 24°C (75°F) by the end. Nights are cool, with lows typically ranging from 6°C (43°F) to 11°C (52°F).
Average temperatures in May
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in May
Historical weather for Boise in May
Browse day-by-day weather records for Boise spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Boise historical weather extremes in May
The extremes listed below come from historical weather data collected in Boise from 1976 through 2026.
- Boise recorded its highest May temperature of 38°C (100°F) on May 31, 2025.
- Nighttime temperatures dropped to -5°C (23°F) on May 2, 1988, marking the coldest May night on record.
Best Places in the United States of America in May
Find out more about the weather in the United States of America and which places have the best travel conditions in this month. See all of the United States of America in May →
perfect weather
pleasant
tolerable
unpleasant
poor
What to Wear in Boise in May
Pleasant temperatures in May mean you can pack light but flexibel pieces. Think cotton t-shirts, comfortable walking shorts, and one warmer layer for evenings. A light sweater or denim jacket works well. Pack a light rain jacket or compact umbrella for occasional showers. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.What To Do in Boise in May
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our Boise's climate page.
Temperature Rainfall Sunshine Humidity
See the full Boise climate overview or explore weather in the United States of America.
