Las Vegas in September
Normal high 95°F, normal low 72°F (NOAA 1991-2020)
- Normal high
- 94.9°F (1991-2020)
- Normal low
- 72.4°F (1991-2020)
- Normal average temperature
- 83.6°F
- Normal precipitation
- 0.32 in
- Record high
- 114°F on September 6, 2020
- Record low
- 43°F on September 27, 1948
- Days of 100°F or warmer
- 7.9 in a normal September
- Days of 90°F or warmer
- 24.1 in a normal September
- Monsoon
- Typically wanes by September, per the NWS
- Major recurring event
- Las Vegas Raiders NFL season (2026 home opener: September 13, Allegiant Stadium)
About
September is still summer in Las Vegas, but it is the month the heat starts to break. NOAA's 1991-2020 normals for Harry Reid International Airport give an average high of 94.9°F and an average low of 72.4°F, about eight degrees cooler than August by day. A normal September still has 7.9 days of 100°F or more, mostly early in the month, and the September record is 114°F, set on September 6, 2020.
The National Weather Service says that by September the monsoon typically wanes and the valley gets its first break from the intense heat of summer. Thunderstorms are still possible, and normal September precipitation is 0.32 inches. Late in the month, the first cold-season storms can bring strong winds; the NWS says these have been seen as early as late September.
Evenings become noticeably more comfortable as the month goes on. The coldest September night on record was 43°F, in 1948, but normal lows stay in the 70s.
What to expect
NFL football returns to Allegiant Stadium. The Las Vegas Raiders opened their 2026 regular season at home on September 13; check raiders.com for future home dates.
The Vegas Golden Knights' NHL regular season begins at the end of the month: their 2026-27 schedule opens at T-Mobile Arena on September 29, 2026, according to the NHL's published schedule.
The months either side
Plan the trip
Good to know
- Early September can still be extreme. Keep following SNHD's heat advice: water before thirst, shade, light clothing and a hat.
- Thunderstorms are still possible. If you meet flood water on a road, turn around; the NWS says 12 inches of rushing water can carry away most cars.
- Plan outdoor sightseeing for mornings and evenings, especially before mid-month.
- Pack for heat by day and warm evenings; normal lows are in the low 70s.
Questions about Las Vegas in September
Is it still hot in Las Vegas in September?
Yes, especially early in the month. NOAA's 1991-2020 normals for Harry Reid International Airport give an average September high of 94.9°F and low of 72.4°F. A normal September has about eight days at 100°F or more and 24 at 90°F or more. The record is 114°F, set on September 6, 2020.
When does the heat break in Las Vegas?
The National Weather Service says that by September the monsoon typically wanes and the first break from the intense heat of summer arrives. The normal high drops from 102.8°F in August to 94.9°F in September and 81.2°F in October, based on NOAA's 1991-2020 normals for the airport.
Are there still monsoon storms in September?
They become less common but can still happen. The NWS says the monsoon typically runs through July and August and wanes by September. Normal September precipitation is 0.32 inches. If storms do form, avoid washes and never drive into flood water.
When do the Raiders play at home?
The Las Vegas Raiders play home games at Allegiant Stadium during the NFL season. Their 2026 regular season opened at home on September 13, and their published schedule lists further home dates through the autumn and into December. Check raiders.com for the current schedule and tickets.
When does the Golden Knights season start?
The NHL's published 2026-27 schedule for the Vegas Golden Knights begins with a home game at T-Mobile Arena on September 29, 2026, and the regular season runs to April 10, 2027. Check the team's official site for tickets and game times.