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September Weather in Byron, United States

Last updated: June 24, 2025

In September, the average temperature in Byron, United States hovers around 18°C (64°F), with a minimum dropping to 2°C (37°F) and a maximum reaching up to 33°C (91°F). Expect around 67 mm (2.6 in) of precipitation over approximately 8 days, alongside an average humidity level of 76%.

September Temperature in Byron

In September in Byron, the average temperature is 18°C (64°F), with maximums reaching 33°C (91°F) and minimums dropping as low as 2°C (37°F). This range makes it a perfect time for travelers to enjoy a variety of outdoor activities, from warm days to cooler evenings.

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

The chart illustrates September temperature patterns in Byron, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Byron, September typically has an average temperature of 18°C (64°F), with highs reaching up to 33°C (91°F) and lows dropping to around 2°C (37°F).
JanFebMarAprMayJunJulAugSepOctNovDec272935455867727064533932
Data source: Temperature data for Byron 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 Byron

In Byron in September, the total precipitation amount is 67 mm (2.6 in) over the course of 8 days.

September Precipitation Trends in Byron

The chart displays monthly precipitation patterns in Byron, 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 Byron, September typically receives around 67 mm (2.6 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec7580731131058514597671388584
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Byron

In Byron in September, humidity is 76%. With an average temperature of 18°C (64°F), this humidity feels like a warm blanket wrapping around you, making outdoor activities feel steamy and invigorating—perfect for exploring charming streets, though you might want to take breaks in the shade.

September Average Humidity in Byron

This chart illustrates the average monthly humidity levels in Byron, 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 Byron is approximately 76%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec91%91%88%88%82%80%77%72%76%83%88%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Byron

In Byron in September, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Byron.

Maximum UV Index Levels in Byron for September

The chart shows the monthly maximum UV Index (UVI) for Byron 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 Byron typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3458910997532
Data source: Byron 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 Byron Compares to Other Months

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

This table compares monthly weather conditions in Byron, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-3°C (27°F)74 mm (2.9 inches)91%moderate
February Weather-2°C (29°F)80 mm (3.1 inches)91%moderate
March Weather2°C (35°F)73 mm (2.9 inches)88%moderate
April Weather7°C (46°F)113 mm (4.4 inches)88%very high
May Weather14°C (58°F)105 mm (4.1 inches)82%very high
June Weather20°C (67°F)85 mm (3.3 inches)79%very high
July Weather22°C (72°F)145 mm (5.7 inches)77%very high
August Weather21°C (71°F)97 mm (3.8 inches)72%very high
September Weather18°C (64°F)67 mm (2.6 inches)76%high
October Weather12°C (54°F)138 mm (5.4 inches)83%moderate
November Weather4°C (39°F)85 mm (3.3 inches)88%moderate
December Weather0°C (32°F)84 mm (3.3 inches)87%low

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