Boise in May
In May, Boise averages 23°C (74°F) during the day and 9°C (48°F) at night, with around 8 days of rain (39 mm total).
High seasonConditions are comfortable for sightseeing without being sweltering. Occasional showers are likely but won't dominate.
May is a great month to visit Boise: pleasant temperatures and relatively few wet days.
How May compares to the rest of the year in Boise
May is in the middle of the year for warmth in Boise (5th of 12) and moderately rainy compared to the rest of the year (5th of 12). Daytime temperature runs 5°C above the annual average (19°C). May runs 6°C warmer than April (18°C) and warms a further 6°C into June (29°C).
May sunrise & sunset in Boise
Times shown for Boise local time (America/Boise), calculated for the 15th of May. They shift by a few minutes day to day across the month.
Photography light in Boise — May
Golden-hour and blue-hour windows for the 15th of May, in Boise's local time. Use these for soft warm light (golden) or cool architectural twilight (blue).
📅 When to book — Boise in May
Travel writers usually only tell you when to go. Here's when to book flights and lodging for the best mix of price and availability, based on May's tier (High season) and Boise's popularity.
Crowds & pricing — May in Boise
This is a busy month in Boise — not the absolute peak, but tourist numbers are clearly elevated. You'll feel it at headline attractions on weekends and in the historic centre, though side streets and lesser-known sights stay manageable. Prices are above off-season but not at their summit. A good week for first-time visitors who want everything open without the worst of the crush.
Why this tier: excellent tourism weather
Sun & mosquito risk — May in Boise
UV is a clear-sky sea-level estimate — clouds, altitude, and reflective surfaces (snow, water) shift it ±30%. Mosquito risk is climate-derived only; for current disease advisories (dengue, malaria, zika) check the CDC or WHO travel pages before your trip.
Boise in other months
| Month | Avg high | Avg low | Rainfall | Rain days | Snow days |
|---|---|---|---|---|---|
| January | 4°C / 40°F | -4°C / 26°F | 43 mm | 10 | — |
| February | 8°C / 46°F | -2°C / 29°F | 38 mm | 9 | — |
| March | 13°C / 56°F | 2°C / 35°F | 39 mm | 9 | — |
| April | 18°C / 64°F | 4°C / 40°F | 31 mm | 7 | — |
| May | 23°C / 74°F | 9°C / 48°F | 39 mm | 8 | — |
| June | 29°C / 84°F | 14°C / 57°F | 22 mm | 3 | — |
| July | 35°C / 95°F | 19°C / 65°F | 2 mm | 1 | — |
| August | 34°C / 92°F | 18°C / 64°F | 5 mm | 1 | — |
| September | 28°C / 82°F | 13°C / 55°F | 15 mm | 3 | — |
| October | 19°C / 66°F | 7°C / 44°F | 26 mm | 5 | — |
| November | 10°C / 50°F | 0°C / 33°F | 37 mm | 8 | — |
| December | 4°C / 39°F | -3°C / 26°F | 55 mm | 12 | — |
Other cities with similar May weather
🌍 See the full ranked list of climate twins for Boise in May →
Frequently asked questions
How hot is Boise in May?
In May, Boise averages a high of 23°C (74°F) and a low of 9°C (48°F) — generally mild and pleasant.
Does it rain a lot in Boise in May?
May sees occasional rain in Boise, with about 8 rainy days on average.
Is May a good time to visit Boise?
May is mild and pleasant. It suits travelers who are comfortable with mild and pleasant weather; check the month-by-month ranking to compare it against the rest of the year.
What should I pack for Boise in May?
Pack light layers for warm days and cooler evenings. See the full May packing list for Boise for a complete, climate-based checklist.
Check the live 10-day forecast and sunrise/sunset.