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September Weather in Littleton, United States

Last updated: June 24, 2025

In Littleton, United States, the average temperature in September hovers around 23°C (74°F). However, be prepared for a range of conditions, with minimum temperatures dipping to 9°C (48°F) and soaring highs reaching 36°C (96°F). Expect 115 mm (4.5 in) of precipitation spread over 10 days, contributing to an average humidity level of 75%. Don't forget to pack accordingly!

September Temperature in Littleton

In September in Littleton, the average temperature is 23°C (74°F). The maximum can reach 36°C (96°F), while the minimum can be as low as 9°C (48°F). It's a perfect time for travelers to experience pleasant weather, making outdoor activities enjoyable.

September Weather in Littleton: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Littleton, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Littleton, September typically has an average temperature of 23°C (74°F), with highs reaching up to 36°C (96°F) and lows dropping to around 9°C (48°F).
JanFebMarAprMayJunJulAugSepOctNovDec424752616976807874655146
Data source: Temperature data for Littleton generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Littleton

In Littleton in September, the precipitation amount is 115 mm (4.5 in) over a span of 10 days.

September Precipitation Trends in Littleton

The chart displays monthly precipitation patterns in Littleton, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Littleton, September typically receives around 115 mm (4.5 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec8911086104124128116151115968097
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Littleton

In Littleton in September, humidity is 75%. With an average temperature of 23°C (74°F), this humidity feels like a warm, heavy blanket wrapping around you, making it feel more sweltering than it actually is, which can be quite uncomfortable for traveling.

September Average Humidity in Littleton

This chart illustrates the average monthly humidity levels in Littleton, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Littleton is approximately 75%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%84%84%82%83%83%79%77%75%81%87%85%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Littleton

In Littleton in September, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Littleton.

Maximum UV Index Levels in Littleton for September

The chart shows the monthly maximum UV Index (UVI) for Littleton in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in Littleton typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec4689101111109853
Data source: Littleton September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How September Weather in Littleton Compares to Other Months

Weather in Littleton varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Littleton, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Littleton, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather6°C (42°F)89 mm (3.5 inches)84%moderate
February Weather8°C (47°F)110 mm (4.3 inches)84%high
March Weather11°C (52°F)86 mm (3.4 inches)84%very high
April Weather16°C (61°F)104 mm (4.1 inches)82%very high
May Weather21°C (70°F)124 mm (4.9 inches)82%very high
June Weather24°C (76°F)128 mm (5.0 inches)83%extreme
July Weather27°C (80°F)116 mm (4.6 inches)79%extreme
August Weather26°C (78°F)151 mm (5.9 inches)77%very high
September Weather23°C (74°F)115 mm (4.5 inches)75%very high
October Weather18°C (65°F)96 mm (3.8 inches)81%very high
November Weather10°C (51°F)80 mm (3.2 inches)87%moderate
December Weather8°C (46°F)97 mm (3.8 inches)85%moderate

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