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September Weather in Vista West, United States

Last updated: June 24, 2025

In September, the average temperature in Vista West, United States hovers around 16°C (61°F). However, be prepared for dramatic fluctuations, with minimums plunging to -9°C (17°F) and maximums soaring to 36°C (97°F). Rain is not uncommon, with an average precipitation of 24 mm (0.9 in) over about 4 days. The environment tends to be quite humid, averaging 72%, making for a unique weather experience throughout the month.

September Temperature in Vista West

In September in Vista West, the average temperature is 16°C (61°F). Maximums can reach 36°C (97°F), while minimums can drop as low as -9°C (17°F). It's advisable to pack for a range of temperatures when traveling to Vista West during this month.

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

The chart illustrates September temperature patterns in Vista West, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Vista West, September typically has an average temperature of 16°C (61°F), with highs reaching up to 36°C (97°F) and lows dropping to around -9°C (17°F).
JanFebMarAprMayJunJulAugSepOctNovDec201932395166737061423424
Data source: Temperature data for Vista West 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 Vista West

In Vista West in September, the precipitation amount is 24 mm (0.9 in) over a period of 4 days.

September Precipitation Trends in Vista West

The chart displays monthly precipitation patterns in Vista West, 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 Vista West, September typically receives around 24 mm (0.9 inches) of precipitation spread over approximately 4 days.
JanFebMarAprMayJunJulAugSepOctNovDec212843546125111324382325
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Vista West

In Vista West in September humidity is 72%. With an average temperature of 16°C (61°F), this humidity feels like a damp blanket wrapping around you, making every step feel heavier and requiring extra effort while traveling.

September Average Humidity in Vista West

This chart illustrates the average monthly humidity levels in Vista West, 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 Vista West is approximately 72%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec79%81%70%67%70%75%76%76%72%70%77%81%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Vista West

In Vista West 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 Vista West.

Maximum UV Index Levels in Vista West for September

The chart shows the monthly maximum UV Index (UVI) for Vista West 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 Vista West typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec46711101212119643
Data source: Vista West 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 Vista West Compares to Other Months

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

This table compares monthly weather conditions in Vista West, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-6°C (21°F)21 mm (0.8 inches)79%moderate
February Weather-7°C (19°F)28 mm (1.1 inches)81%high
March Weather0°C (32°F)43 mm (1.7 inches)70%high
April Weather4°C (40°F)54 mm (2.1 inches)67%extreme
May Weather10°C (51°F)61 mm (2.4 inches)70%very high
June Weather19°C (66°F)24 mm (1.0 inches)75%extreme
July Weather23°C (74°F)11 mm (0.4 inches)76%extreme
August Weather21°C (71°F)13 mm (0.5 inches)76%extreme
September Weather16°C (61°F)24 mm (0.9 inches)72%very high
October Weather5°C (42°F)38 mm (1.5 inches)70%high
November Weather1°C (35°F)23 mm (0.9 inches)76%moderate
December Weather-4°C (24°F)25 mm (1.0 inches)81%moderate

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