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September Weather in Chula Vista, Mexico

Last updated: August 27, 2025

In September, the average temperature in Chula Vista, Mexico is a warm 26°C (80°F). Expect a range between a cool 16°C (61°F) and a scorching 39°C (103°F). With an average humidity of 80%, the air can feel quite muggy, and you might encounter about 32 mm (1.3 in) of precipitation spread across 6 days.

September Temperature in Chula Vista

In September in Chula Vista, the average temperature is 26°C (80°F). Maximums can reach 39°C (103°F) and minimums can be as low as 16°C (61°F). This pleasant climate makes it an ideal time for outdoor activities and exploration.

September Weather in Chula Vista: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Chula Vista, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Chula Vista, September typically has an average temperature of 26°C (80°F), with highs reaching up to 39°C (103°F) and lows dropping to around 16°C (61°F).
JanFebMarAprMayJunJulAugSepOctNovDec576471778486848580746558
Data source: Temperature data for Chula Vista 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 Chula Vista

In Chula Vista in September, the total precipitation amount is 32 mm (1.3 in) over the course of 6 days.

September Precipitation Trends in Chula Vista

The chart displays monthly precipitation patterns in Chula Vista, 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 Chula Vista, September typically receives around 32 mm (1.3 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec337271317153230512
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Chula Vista

In Chula Vista in September humidity is 80%. With an average temperature of 26°C (80°F), this humidity feels like a warm, enveloping blanket, making it quite uncomfortable for traveling. The thick, heavy air can leave you feeling sticky and fatigued, making outdoor activities more challenging and necessitating frequent breaks for hydration and cooling down.

September Average Humidity in Chula Vista

This chart illustrates the average monthly humidity levels in Chula Vista, 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 Chula Vista is approximately 80%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec75%65%59%59%65%69%66%60%80%83%86%86%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Chula Vista

In Chula Vista in September, the maximum UV index is 12, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, underscoring the importance of sun protection. For detailed information, you can check the Hourly UV Index in Chula Vista.

Maximum UV Index Levels in Chula Vista for September

The chart shows the monthly maximum UV Index (UVI) for Chula Vista 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 Chula Vista typically reaches 12, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec710111313131313121086
Data source: Chula Vista 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 Chula Vista Compares to Other Months

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

This table compares monthly weather conditions in Chula Vista, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather14°C (57°F)3 mm (0.1 inches)75%high
February Weather18°C (64°F)3 mm (0.1 inches)65%very high
March Weather21°C (71°F)7 mm (0.3 inches)59%extreme
April Weather25°C (78°F)2 mm (0.1 inches)59%extreme
May Weather29°C (84°F)7 mm (0.3 inches)65%extreme
June Weather30°C (86°F)13 mm (0.5 inches)69%extreme
July Weather29°C (85°F)17 mm (0.7 inches)66%extreme
August Weather29°C (85°F)15 mm (0.6 inches)60%extreme
September Weather26°C (80°F)32 mm (1.3 inches)80%extreme
October Weather23°C (75°F)29 mm (1.2 inches)83%very high
November Weather18°C (65°F)5 mm (0.2 inches)86%very high
December Weather14°C (58°F)12 mm (0.5 inches)86%high

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