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.
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 Longmont's climate page.
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% *
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
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unpleasant
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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.
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 Longmont's climate page.
Temperature Rainfall Sunshine Humidity
See the full Longmont climate overview or explore weather in the United States of America.
