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Boulder Weather in October

October in Boulder sees daytime temperatures around 18°C (64°F) and lows of 4°C (39°F) at night. Pack a rain jacket because some rainfall is likely.

Rainfall in Boulder in October

Typically, you can expect about 7 days of rain this month, with 45 mm (1.8 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 Boulder in October

Expect highs of 18°C (64°F) in Boulder in October, with nights dropping to around 4°C (39°F). Even when the weather is stable, mornings and evenings can still feel distinctly cool. With overnight lows of 4°C (39°F), nights are cold. The cold air does make for deep, comfortable sleep if you have enough blankets.

Sunshine in Boulder in October

The city usually sees around 253 hours of sunlight, indicating many sunny days — a great month for sightseeing.

Our weather planner can help you find worldwide destinations with pleasant weather during this period. May, June and September typically offer the best weather for Boulder.

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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 Boulder's climate page.

Boulder Temperature in October

Min TemperatureMin Temperature 4°C (39°F)  
Max TemperatureMax Temperature 18°C (64°F)  
Chance of RainChance of Rain 24%  
PrecipitationPrecipitation 45 mm (1.8 in)  
Rainy daysRainy days 7 days  
HumidityHumidity 49% *  
SunshineSunshine 253 hours *  
Percentage SunshinePercentage Sunshine 72% *  
* Data from: Denver, the United States of America (45 KM, 28 Miles).

Best Places in the United States of America in October

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 October →

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Legend 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 Boulder in October

Comfortable temperatures call for an easy wardrobe in October. Pack summer basics like t-shirts and shorts, but include a light jacket for cooler moments. A pair of comfortable walking shoes is essential. Wet weather is likely, so pack waterproof gear for multiple rainy days. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.

What To Do in Boulder in October

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Cycling
10/10
Walking
10/10
Camping
5/10
Outdoor sports
10/10

Select a Month

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 Boulder's climate page.

More climate data for Boulder