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.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our Lake Mead's climate page.
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% *
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 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 2025, 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
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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.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our Lake Mead's climate page.
Temperature Rainfall Sunshine Humidity
See the full Lake Mead climate overview or explore weather in the United States of America.
