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September Weather in Roundup, United States

Last updated: June 24, 2025

In September, the average temperature in Roundup, United States is a comfortable 16°C (62°F). However, temperatures can vary significantly, with minimums dropping to 1°C (34°F) and maximums soaring to 37°C (99°F). During this month, you can expect about 38 mm (1.5 in) of precipitation spread over 5 days, contributing to an average humidity level of 67%.

September Temperature in Roundup

In September in Roundup, the average temperature is 16°C (62°F). Maximum temperatures can reach 37°C (99°F), while the minimum can drop as low as 1°C (34°F). This diverse temperature range suggests that travelers should pack accordingly to enjoy their time comfortably.

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

The chart illustrates September temperature patterns in Roundup, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Roundup, September typically has an average temperature of 16°C (62°F), with highs reaching up to 37°C (99°F) and lows dropping to around 1°C (34°F).
JanFebMarAprMayJunJulAugSepOctNovDec261935435466747261453629
Data source: Temperature data for Roundup 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 Roundup

In Roundup in September, the total precipitation amount is 38 mm (1.5 in) spread over a duration of 5 days.

September Precipitation Trends in Roundup

The chart displays monthly precipitation patterns in Roundup, 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 Roundup, September typically receives around 38 mm (1.5 inches) of precipitation spread over approximately 5 days.
JanFebMarAprMayJunJulAugSepOctNovDec193627616569232038342326
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Roundup

In Roundup in September, humidity is 67%. With an average temperature of 16°C (62°F), this humidity feels like a warm, enveloping embrace, making outdoor explorations comfortable yet slightly damp, perfect for leisurely strolls and enjoying the vibrant local culture.

September Average Humidity in Roundup

This chart illustrates the average monthly humidity levels in Roundup, 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 Roundup is approximately 67%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec81%85%77%72%75%78%79%76%67%69%78%85%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Roundup

In Roundup 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 Roundup.

Maximum UV Index Levels in Roundup for September

The chart shows the monthly maximum UV Index (UVI) for Roundup 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 Roundup typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec25599101098532
Data source: Roundup 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 Roundup Compares to Other Months

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

This table compares monthly weather conditions in Roundup, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-3°C (26°F)19 mm (0.7 inches)81%low
February Weather-7°C (20°F)36 mm (1.4 inches)85%moderate
March Weather2°C (35°F)27 mm (1.1 inches)77%moderate
April Weather6°C (43°F)61 mm (2.4 inches)72%very high
May Weather12°C (55°F)65 mm (2.6 inches)75%very high
June Weather19°C (66°F)69 mm (2.7 inches)78%very high
July Weather23°C (75°F)22 mm (0.9 inches)79%very high
August Weather22°C (72°F)20 mm (0.8 inches)76%very high
September Weather16°C (62°F)38 mm (1.5 inches)67%very high
October Weather7°C (46°F)34 mm (1.3 inches)69%moderate
November Weather2°C (37°F)23 mm (0.9 inches)78%moderate
December Weather-2°C (29°F)26 mm (1.0 inches)85%low

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