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September Weather in Surprise, United States

Last updated: June 24, 2025

In Surprise, United States, the average temperature in September is a warm 30°C (87°F). However, temperatures can vary significantly, with a minimum of 13°C (56°F) and a maximum reaching 44°C (111°F). Expect a bit of drizzle, as the precipitation amounts to 21 mm (0.8 in) over 2 days. Additionally, the average humidity sits at a comfortable 64%.

September Temperature in Surprise

In September in Surprise, the average temperature is 30°C (87°F). Maximums can reach 44°C (111°F), while minimums can drop as low as 13°C (56°F). Be prepared for hot days and cooler nights when traveling during this month.

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

The chart illustrates September temperature patterns in Surprise, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Surprise, September typically has an average temperature of 30°C (87°F), with highs reaching up to 44°C (111°F) and lows dropping to around 13°C (56°F).
JanFebMarAprMayJunJulAugSepOctNovDec545563738090939287746454
Data source: Temperature data for Surprise 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 Surprise

In Surprise in September, the precipitation amount is 21 mm (0.8 in) over a period of 2 days.

September Precipitation Trends in Surprise

The chart displays monthly precipitation patterns in Surprise, 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 Surprise, September typically receives around 21 mm (0.8 inches) of precipitation spread over approximately 2 days.
JanFebMarAprMayJunJulAugSepOctNovDec293935123412921222623
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Surprise

In Surprise in September humidity is 64%. With an average temperature of 30°C (87°F), this humidity feels like a warm, muggy embrace, making travel a bit sticky and uncomfortable but also inviting you to slow down and savor refreshing breaks in the shade.

September Average Humidity in Surprise

This chart illustrates the average monthly humidity levels in Surprise, 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 Surprise is approximately 64%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec76%79%67%55%40%33%34%48%64%67%77%82%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Surprise

In Surprise in September, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Surprise.

Maximum UV Index Levels in Surprise for September

The chart shows the monthly maximum UV Index (UVI) for Surprise 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 Surprise typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec469101112111110754
Data source: Surprise 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 Surprise Compares to Other Months

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

This table compares monthly weather conditions in Surprise, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather12°C (54°F)29 mm (1.1 inches)76%moderate
February Weather13°C (56°F)39 mm (1.5 inches)79%high
March Weather17°C (63°F)35 mm (1.4 inches)67%very high
April Weather23°C (73°F)1 mm (0.1 inches)55%very high
May Weather26°C (80°F)2 mm (0.1 inches)40%extreme
June Weather32°C (91°F)3 mm (0.1 inches)33%extreme
July Weather34°C (93°F)41 mm (1.6 inches)34%extreme
August Weather34°C (93°F)29 mm (1.2 inches)48%extreme
September Weather30°C (87°F)21 mm (0.8 inches)64%very high
October Weather23°C (74°F)22 mm (0.9 inches)67%high
November Weather18°C (65°F)26 mm (1.0 inches)77%moderate
December Weather12°C (54°F)23 mm (0.9 inches)82%moderate

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