Yosemite National Park is definitely worth a visit
Vast forests, blue lakes, towering sequoias, and majestic waterfalls hint at the beauty of Yosemite National Park—a true natural masterpiece.
Lake Mead Weather in September
Lake Mead in September sees extremely high daytime temperatures of 37°C (99°F) and nighttime lows of 22°C (72°F). With just 5.7 mm (0.2 in) of rainfall expected, it's a dry month overall.
Rainfall in Lake Mead in September
Typically around 2 days of rainfall are expected, averaging 5.7 mm (0.2 in) for the month. Rain is scarce this month and when it does fall, it tends to be light. Unlikely to disrupt plans significantly.
Temperature in Lake Mead in September
Lake Mead in September gets highs of 37°C (99°F) during the day and drops to 22°C (72°F) at night. If you're spending a lot of time outdoors, it helps to plan around the warmer part of the day. Nights are mild at around 22°C (72°F), which is comfortable for most people.
Sunshine in Lake Mead in September
With approximately 345 hours of sunshine, the days are filled with clear skies. It makes it a perfect month for being outside.September in Lake Mead has its charm. However, if you're seeking pleasant, dry and sunny weather, our weather planner can help you explore other destinations in the world.
Lake Mead Temperature in September
Min Temperature
22°C (72°F)
Max Temperature
37°C (99°F)
Chance of Rain
7%
Precipitation
5.7 mm (0.2 in)
Rainy days
2 days
Humidity
25% *
Sunshine
345 hours *
Percentage Sunshine
91% *
* Data from: Las Vegas, the United States of America (72 KM, 44 Miles).
Lake Mead Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Lake Mead - and find the best time to visit.
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Lake Mead typically drop from around 37°C (99°F) at the start of September to approximately 33°C (91°F) by the end. Nights are warm, with lows typically ranging from 19°C (66°F) to 24°C (75°F).
Average temperatures in September
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 September
Historical weather records for Lake Mead in September
Browse day-by-day weather records for Lake Mead spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Lake Mead historical weather extremes in September
Based on weather observations in Lake Mead between 1976 and 2026, these are the recorded extremes during September.
- The warmest day in September was on September 6, 2020, with a maximum of 45°C (113°F).
- The lowest overnight temperature recorded in September was 8°C (46°F) (September 30, 1982).
Best Places in the United States of America in September
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 September →
perfect weather
pleasant
tolerable
unpleasant
poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
What to Wear in Lake Mead in September
Get ready for hot weather in September! Lightweight, breathable fabrics are your best friend during this month. Cotton and linen shirts, shorts, sundresses, and sandals will keep you comfortable. Light colors help reflect the heat, avoid wearing black. Almost no rain is expected, so no need to bring rain gear. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.
What To Do in Lake Mead in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
-
Swimming10/10 -
Camping10/10
Lake Mead 3-Day Forecast
More climate data for Lake Mead
Temperature Rainfall Sunshine Humidity
See the full Lake Mead climate overview or explore weather in the United States of America.
Popular in September
Where to go in September - average daytime high across popular destinations.
Bucket list
Need travel inspiration? Check out our bucket list articles and be inspired.
Yosemite National Park is definitely worth a visit
The 10 most alternative cities in the United States
Discover the top 10 fun and alternative U.S. cities rich in art, culture, and adventure. From Portland's hippy charm to Sedona's stunning landscapes.
Sedona: Explore Majestic Red Rock Landscapes
A picturesque artists' town surrounded by red rocks and known for its spirituality, vortex energy, and stunning hikes like Cathedral Rock.
10 most idyllic villages to visit in the United States
Discover 10 idyllic villages in the USA, from California to Vermont. Explore their unique charm, rich history, stunning nature, and vibrant arts scenes.