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September Weather in Box Elder, United States

Last updated: June 24, 2025

In Box Elder, United States, the average temperature in September hovers around 18°C (64°F). However, temperatures can vary widely, with minimums dipping to -1°C (30°F) and maximums soaring up to 39°C (102°F). You'll also experience average humidity levels of 76%, complemented by 33 mm (1.3 in) of precipitation over 6 days.

September Temperature in Box Elder

In September in Box Elder, the average temperature is 18°C (64°F). The maximum can reach 39°C (102°F) and the minimum can be as low as -1°C (30°F). This diverse range of temperatures makes it essential for travelers to be prepared for both warm and cool conditions.

September Weather in Box Elder: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Box Elder, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Box Elder, September typically has an average temperature of 18°C (64°F), with highs reaching up to 39°C (102°F) and lows dropping to around -1°C (30°F).
JanFebMarAprMayJunJulAugSepOctNovDec272236435569757164463730
Data source: Temperature data for Box Elder 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 Box Elder

In Box Elder, in September, the precipitation amount is 33 mm (1.3 in) over the course of 6 days.

September Precipitation Trends in Box Elder

The chart displays monthly precipitation patterns in Box Elder, 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 Box Elder, September typically receives around 33 mm (1.3 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec122238629456693434481326
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Box Elder

In Box Elder 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 Box Elder

This chart illustrates the average monthly humidity levels in Box Elder, 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 Box Elder is approximately 76%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec73%78%64%66%74%84%85%85%76%71%73%75%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Box Elder

In Box Elder 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 Box Elder.

Maximum UV Index Levels in Box Elder for September

The chart shows the monthly maximum UV Index (UVI) for Box Elder 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 Box Elder typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356991111108532
Data source: Box Elder 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 Box Elder Compares to Other Months

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

This table compares monthly weather conditions in Box Elder, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-3°C (27°F)11 mm (0.5 inches)73%moderate
February Weather-5°C (23°F)21 mm (0.8 inches)78%moderate
March Weather2°C (37°F)38 mm (1.5 inches)64%high
April Weather6°C (44°F)62 mm (2.4 inches)66%very high
May Weather13°C (55°F)93 mm (3.7 inches)74%very high
June Weather21°C (69°F)56 mm (2.2 inches)84%extreme
July Weather24°C (75°F)69 mm (2.7 inches)85%extreme
August Weather22°C (72°F)34 mm (1.3 inches)85%very high
September Weather18°C (64°F)33 mm (1.3 inches)76%very high
October Weather8°C (47°F)48 mm (1.9 inches)71%moderate
November Weather3°C (38°F)13 mm (0.5 inches)73%moderate
December Weather-1°C (30°F)26 mm (1.0 inches)75%low

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