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September Weather in Alliance, United States

Last updated: June 24, 2025

In September, the average temperature in Alliance, United States hovers around 24°C (76°F), offering a pleasant climate. However, you can expect temperature variations with minimums dipping to 12°C (54°F) and highs reaching up to 34°C (94°F). Prepare for some rain, as precipitation averages 159 mm (6.2 in) over 13 days, alongside an average humidity of 80%.

September Temperature in Alliance

In September, in Alliance, the average temperature is 24°C (76°F), with maximums reaching 34°C (94°F) and minimums dropping as low as 12°C (54°F). This makes Alliance an ideal destination for travelers seeking warm weather and pleasant conditions.

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

The chart illustrates September temperature patterns in Alliance, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Alliance, September typically has an average temperature of 24°C (76°F), with highs reaching up to 34°C (94°F) and lows dropping to around 12°C (54°F).
JanFebMarAprMayJunJulAugSepOctNovDec465154637177808076685550
Data source: Temperature data for Alliance 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 Alliance

In Alliance in September, the precipitation amount is 159 mm (6.2 in) spread over 13 days.

September Precipitation Trends in Alliance

The chart displays monthly precipitation patterns in Alliance, 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 Alliance, September typically receives around 159 mm (6.2 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec77103711061261511661851597096123
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Alliance

In Alliance in September humidity is 80%. With an average temperature of 24°C (76°F), this humidity feels like a warm, sticky embrace that can make exploring outdoors quite draining, so it's essential to stay hydrated and take breaks in the shade while traveling.

September Average Humidity in Alliance

This chart illustrates the average monthly humidity levels in Alliance, 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 Alliance is approximately 80%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%81%80%80%81%82%83%83%80%80%83%84%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Alliance

In Alliance 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 Alliance.

Maximum UV Index Levels in Alliance for September

The chart shows the monthly maximum UV Index (UVI) for Alliance 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 Alliance typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec46810111111109854
Data source: Alliance 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 Alliance Compares to Other Months

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

This table compares monthly weather conditions in Alliance, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather8°C (46°F)76 mm (3.0 inches)84%moderate
February Weather11°C (51°F)103 mm (4.1 inches)81%high
March Weather12°C (54°F)71 mm (2.8 inches)80%very high
April Weather17°C (63°F)106 mm (4.2 inches)80%very high
May Weather22°C (71°F)126 mm (4.9 inches)81%extreme
June Weather25°C (77°F)151 mm (5.9 inches)82%extreme
July Weather27°C (81°F)166 mm (6.5 inches)83%extreme
August Weather26°C (80°F)185 mm (7.3 inches)82%very high
September Weather24°C (76°F)159 mm (6.2 inches)80%very high
October Weather20°C (68°F)70 mm (2.8 inches)79%very high
November Weather13°C (55°F)96 mm (3.8 inches)83%moderate
December Weather10°C (50°F)123 mm (4.8 inches)84%moderate

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