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.
Longmont Weather in September
September in Longmont brings high temperatures, with highs of 27°C (81°F) and nights dropping to 8°C (46°F). With excellent weather conditions overall, it's a good time to visit.
Rainfall in Longmont in September
Based on our climate data of the past 30 years, about 7 days of rain are anticipated, with 41 mm (1.6 in) on average. Neither particularly heavy nor particularly frequent, the rain this month is about average. A light jacket should be enough on most wet days.
Temperature in Longmont in September
September tends to be one of the excellent months in Longmont, with 27°C (81°F) in the afternoon and 8°C (46°F) overnight. This kind of day-to-night contrast is typical for this time of year. Nights drop to 8°C (46°F). Cold nights like these are actually great for sleeping well, as long as you have a warm enough duvet.
Sunshine in Longmont in September
Expect sunny days throughout the month, with an estimated 270 hours of sunshine. This makes it a pleasant time to visit Longmont.Our weather planner can help you find worldwide destinations with pleasant weather during this period. May and September typically offer the best weather for Longmont.
Longmont Temperature in September
Min Temperature
8°C (46°F)
Max Temperature
27°C (81°F)
Chance of Rain
23%
Precipitation
41 mm (1.6 in)
Rainy days
7 days
Humidity
50% *
Sunshine
270 hours *
Percentage Sunshine
73% *
* Data from: Denver, the United States of America (50 KM, 31 Miles).
Longmont Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Longmont - and find the best time to visit.
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 Longmont in September
Warm temperatures in September make for comfortable sightseeing weather. Pack breathable fabrics like cotton shirts, knee-length shorts or skirts, and comfortable walking shoes. A thin long sleeve for indoor spaces is handy. Rain gear is recommended, you can expect wet weather on multiple days. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.
What To Do in Longmont in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Swimming10/10 -
Cycling8/10 -
Walking8/10 -
Barbeque10/10 -
Camping5/10 -
Outdoor sports8/10
Longmont 3-Day Forecast
More climate data for Longmont
Temperature Rainfall Sunshine Humidity
See the full Longmont 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
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