Las Vegas in August
Normal high 103°F, normal low 81°F (NOAA 1991-2020)
- Normal high
- 102.8°F (1991-2020)
- Normal low
- 80.6°F (1991-2020)
- Normal average temperature
- 91.7°F
- Normal precipitation
- 0.32 in
- Record high
- 116°F on August 3, 1979 (most recent occurrence)
- Record low
- 54°F on August 3, 1937
- Days of 100°F or warmer
- 24.5 in a normal August
- Nights of 80°F or warmer
- 16.7 in a normal August
- Heat illness
- SNHD: the highest number of heat-related illnesses and deaths in Clark County typically occurs in August
- Major recurring event
- DEF CON: August 5-8, 2027, LVCC West Hall
About
August is almost as hot as July. NOAA's 1991-2020 normals for Harry Reid International Airport give an average high of 102.8°F and an average low of 80.6°F. A normal August has 24.5 days of 100°F or hotter and 16.7 nights that stay at or above 80°F. The August record is 116°F, most recently on August 3, 1979.
The Southern Nevada Health District says August is typically the peak month for heat-related illness and death in Clark County. It reported 284 heat-associated deaths in the county in 2025 and 513 in 2024. Visitors are not immune: walking between resorts on the Strip in the afternoon can mean a long time in direct sun.
August is the second half of the monsoon, which the National Weather Service says typically runs through July and August. Thunderstorms form over the mountains around the valley and drift in, bringing gusty winds, more humid air and, at times, heavy rain that causes flash flooding in washes and low-lying streets. Normal August precipitation is 0.32 inches.
What to expect
DEF CON, the long-running hacker convention, is listed for August 5-8, 2027 at the Las Vegas Convention Center's West Hall.
Football returns before the month is out. The Las Vegas Raiders played two 2026 preseason games at Allegiant Stadium in August (August 13 and 27), and their regular season begins in September; check raiders.com for the 2027 schedule when it is released.
The months either side
Plan the trip
Good to know
- August is the peak month for heat illness in Clark County, according to SNHD. Drink water before you are thirsty and limit alcohol.
- Stay out of the midday sun where you can and take breaks in shade or air conditioning, as SNHD advises.
- Learn the signs of heat stroke from the NWS: body temperature above 103°F, confusion, hot red skin, fainting. Call 911 and cool the person; do not give fluids.
- During monsoon storms, never drive around barriers or into flood water. The NWS warns the road may have collapsed underneath.
- Never leave children or pets in a parked car, SNHD warns.
Questions about Las Vegas in August
How hot is Las Vegas in August?
Very hot. NOAA's 1991-2020 normals for Harry Reid International Airport give an average August high of 102.8°F and average low of 80.6°F. A normal August has about 25 days of 100°F or more. The August record is 116°F, most recently on August 3, 1979, according to the National Weather Service.
Is August dangerous for heat in Las Vegas?
It can be. The Southern Nevada Health District says the highest number of heat-related illnesses and deaths in Clark County typically occurs in August. SNHD advises staying hydrated, staying in air conditioning during the hottest hours, wearing light clothing and a hat, and checking on older adults and children.
Does it storm in Las Vegas in August?
Yes, at times. The National Weather Service says the monsoon typically brings moisture and scattered thunderstorms in July and August. Storms form over the surrounding mountains and move into the valley, sometimes causing damaging winds and flash flooding. Normal August precipitation is 0.32 inches, under NOAA's 1991-2020 normals.
When is DEF CON 2027?
DEF CON lists its 2027 Las Vegas convention for August 5-8, 2027 at the Las Vegas Convention Center's West Hall. DEF CON also announced a separate DEF CON Singapore event for March 4-6, 2027. Check defcon.org for Las Vegas registration, badge information and details closer to the date.
What should I pack for Las Vegas in August?
SNHD recommends lightweight, loose-fitting, light-coloured clothing, a hat and high-SPF sunscreen. Bring a refillable water bottle and comfortable shoes for walking between air-conditioned buildings. A light layer helps indoors, and if you plan to drive outside the city, carry extra water and a charged phone.