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September Weather in Byron, United States

Last updated: June 24, 2025

In September, the average temperature in Byron, United States is a pleasant 18°C (64°F). You might experience a minimum of 1°C (35°F) and enjoy the warmth of maximums reaching 33°C (91°F). As you explore, expect about 124 mm (4.9 in) of precipitation spread over 9 days, with an average humidity level of 75% adding to the climate's characteristic feel.

September Temperature in Byron

In September in Byron, the average temperature is 18°C (64°F). Maximums can reach 33°C (91°F), and minimums can be as low as 1°C (35°F). Travelers should be prepared for a range of temperatures and pack accordingly for both warm days and 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 1°C (35°F).
JanFebMarAprMayJunJulAugSepOctNovDec171733435970737064483425
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 precipitation amount is 124 mm (4.9 in) over the course of 9 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 124 mm (4.9 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec364661901431321001181241054441
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 75%. With an average temperature of 18°C (64°F), this humidity feels like a warm blanket enveloping you, making your travels a bit sticky and requiring frequent breaks in the shade to stay comfortable.

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 75%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%84%80%81%74%81%80%77%75%80%87%83%
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 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to 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 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec35589101098532
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-8°C (17°F)36 mm (1.4 inches)82%moderate
February Weather-8°C (17°F)46 mm (1.8 inches)84%moderate
March Weather1°C (34°F)61 mm (2.4 inches)80%moderate
April Weather6°C (44°F)90 mm (3.5 inches)81%very high
May Weather15°C (59°F)143 mm (5.6 inches)74%very high
June Weather21°C (71°F)132 mm (5.2 inches)80%very high
July Weather23°C (73°F)100 mm (4.0 inches)80%very high
August Weather21°C (70°F)118 mm (4.6 inches)77%very high
September Weather18°C (64°F)124 mm (4.9 inches)75%very high
October Weather9°C (48°F)105 mm (4.1 inches)80%moderate
November Weather1°C (34°F)44 mm (1.7 inches)87%moderate
December Weather-4°C (25°F)41 mm (1.6 inches)83%low

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