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September Weather in Hollister, United States

Last updated: June 24, 2025

In September, the average temperature in Hollister, United States hovers around 18°C (65°F). However, be prepared for a range, as temperatures can dip to a chilly 7°C (45°F) or soar to a sizzling 38°C (101°F). With just 5 mm (0.2 in) of precipitation over 0 days, expect relatively dry conditions and an average humidity of 55%. Enjoy your visit!

September Temperature in Hollister

In September in Hollister, the average temperature is 18°C (65°F). Maximum temperatures can reach 38°C (101°F), while the minimum can drop to as low as 7°C (45°F). Be prepared for a wide range of temperatures when traveling during this month in Hollister.

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

The chart illustrates September temperature patterns in Hollister, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Hollister, September typically has an average temperature of 18°C (65°F), with highs reaching up to 38°C (101°F) and lows dropping to around 7°C (45°F).
JanFebMarAprMayJunJulAugSepOctNovDec505152555863656665615549
Data source: Temperature data for Hollister 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 Hollister

In Hollister in September, the precipitation amount is 5 mm (0.2 in) during a span of 0 days.

September Precipitation Trends in Hollister

The chart displays monthly precipitation patterns in Hollister, 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 Hollister, September typically receives around 5 mm (0.2 inches) of precipitation spread over approximately 0 days.
JanFebMarAprMayJunJulAugSepOctNovDec100778326181115153283
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Hollister

In Hollister in September humidity is 55%. With an average temperature of 18°C (65°F), this humidity feels like a gentle embrace, creating a comfortable yet slightly sticky atmosphere that is perfect for leisurely strolls and outdoor adventures.

September Average Humidity in Hollister

This chart illustrates the average monthly humidity levels in Hollister, 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 Hollister is approximately 55%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%84%82%78%71%64%59%54%55%62%78%80%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Hollister

In Hollister 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 Hollister.

Maximum UV Index Levels in Hollister for September

The chart shows the monthly maximum UV Index (UVI) for Hollister 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 Hollister typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec4589111111109753
Data source: Hollister 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 Hollister Compares to Other Months

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

This table compares monthly weather conditions in Hollister, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather10°C (50°F)99 mm (3.9 inches)82%moderate
February Weather10°C (51°F)76 mm (3.0 inches)84%moderate
March Weather11°C (53°F)83 mm (3.3 inches)82%very high
April Weather13°C (56°F)26 mm (1.0 inches)78%very high
May Weather14°C (58°F)17 mm (0.7 inches)71%extreme
June Weather17°C (63°F)1 mm (0.0 inches)64%extreme
July Weather18°C (65°F)0 mm (0.0 inches)58%extreme
August Weather19°C (67°F)1 mm (0.0 inches)54%very high
September Weather18°C (65°F)5 mm (0.2 inches)55%very high
October Weather16°C (61°F)15 mm (0.6 inches)62%high
November Weather13°C (55°F)32 mm (1.3 inches)78%moderate
December Weather10°C (50°F)83 mm (3.3 inches)80%moderate

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