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September Weather in Chapman, United States

Last updated: June 24, 2025

In September, the average temperature in Chapman, United States is a pleasant 23°C (73°F). Temperatures can range from a refreshing 5°C (41°F) to a warm 37°C (98°F). Visitors can expect around 64 mm (2.5 in) of precipitation spread over 7 days, while the average humidity sits comfortably at 71%.

September Temperature in Chapman

In September in Chapman, the average temperature is 23°C (73°F). Maximums can reach 37°C (98°F) and minimums can be as low as 5°C (41°F). This diverse temperature range makes Chapman perfect for travelers looking for both warm days and cooler evenings.

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

The chart illustrates September temperature patterns in Chapman, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Chapman, September typically has an average temperature of 23°C (73°F), with highs reaching up to 37°C (98°F) and lows dropping to around 5°C (41°F).
JanFebMarAprMayJunJulAugSepOctNovDec323346556679817873574437
Data source: Temperature data for Chapman 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 Chapman

In Chapman in September, the precipitation amount is 64 mm (2.5 in) accumulated over a period of 7 days.

September Precipitation Trends in Chapman

The chart displays monthly precipitation patterns in Chapman, 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 Chapman, September typically receives around 64 mm (2.5 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec30287769187758411664923226
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Chapman

In Chapman in September humidity is 71%. With an average temperature of 23°C (73°F), this humidity feels like a warm, sticky embrace, making outdoor exploration slightly uncomfortable but still manageable if you stay hydrated and plan for breaks in shaded areas.

September Average Humidity in Chapman

This chart illustrates the average monthly humidity levels in Chapman, 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 Chapman is approximately 71%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec76%78%70%73%82%82%81%78%71%71%81%84%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Chapman

In Chapman 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 Chapman.

Maximum UV Index Levels in Chapman for September

The chart shows the monthly maximum UV Index (UVI) for Chapman 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 Chapman typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3569101111109643
Data source: Chapman 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 Chapman Compares to Other Months

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

This table compares monthly weather conditions in Chapman, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather0°C (32°F)30 mm (1.2 inches)76%moderate
February Weather0°C (33°F)28 mm (1.1 inches)77%moderate
March Weather8°C (47°F)77 mm (3.0 inches)70%high
April Weather13°C (55°F)69 mm (2.7 inches)73%very high
May Weather19°C (66°F)187 mm (7.4 inches)82%very high
June Weather26°C (79°F)75 mm (2.9 inches)82%extreme
July Weather27°C (82°F)84 mm (3.3 inches)81%extreme
August Weather25°C (78°F)116 mm (4.6 inches)78%very high
September Weather23°C (73°F)64 mm (2.5 inches)71%very high
October Weather14°C (57°F)92 mm (3.6 inches)71%high
November Weather7°C (45°F)32 mm (1.2 inches)81%moderate
December Weather3°C (37°F)26 mm (1.0 inches)84%moderate

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