Boise in August
In August, Boise averages 34°C (92°F) during the day and 18°C (64°F) at night, with only about 1 rainy day.
ShoulderConditions are very hot — early-morning and evening sightseeing recommended. Skies are generally dry and clear.
It's peak hurricane season in Boise during August. Travel is possible but expect storm risk, possible flight disruption, and generally lower travel insurance coverage.
How August compares to the rest of the year in Boise
August is one of the warmest months in Boise (2nd of 12) and one of the driest months (12th of 12). Daytime temperature runs 15°C above the annual average (19°C). August runs 1°C cooler than July (35°C) and cools 6°C in September (28°C).
August sunrise & sunset in Boise
Times shown for Boise local time (America/Boise), calculated for the 15th of August. They shift by a few minutes day to day across the month.
Photography light in Boise — August
Golden-hour and blue-hour windows for the 15th of August, in Boise's local time. Use these for soft warm light (golden) or cool architectural twilight (blue).
📅 When to book — Boise in August
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 August's tier (Shoulder) and Boise's popularity.
Crowds & pricing — August in Boise
Boise is in a shoulder season month — fewer crowds, slightly lower prices, and a calmer atmosphere than peak weeks. Most major sights stay open with normal hours, though a handful of seasonal restaurants or boat trips may run reduced schedules. Many regulars consider these months the best time to visit because you trade a small amount of weather reliability for a much more pleasant on-the-ground experience.
Why this tier: Northern Hemisphere summer holidays peak hazard season (1 active)
Sun & mosquito risk — August 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 August weather
🌍 See the full ranked list of climate twins for Boise in August →
Frequently asked questions
How hot is Boise in August?
In August, Boise averages a high of 34°C (92°F) and a low of 18°C (64°F) — generally hot.
Does it rain a lot in Boise in August?
August is generally dry in Boise, with about 1 rainy day on average.
Is August a good time to visit Boise?
August is hot and mostly dry. It suits travelers who are comfortable with hot weather; check the month-by-month ranking to compare it against the rest of the year.
What should I pack for Boise in August?
Pack lightweight, breathable clothing, sunglasses and sunscreen. See the full August packing list for Boise for a complete, climate-based checklist.
Check the live 10-day forecast and sunrise/sunset.