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October Weather in Grand Terrace, United States

Last updated: June 24, 2025

In October, the average temperature in Grand Terrace, United States hovers around 19°C (66°F), creating a pleasant atmosphere. However, be prepared for temperature fluctuations, as it can dip to a brisk 5°C (41°F) and soar up to a sizzling 37°C (100°F). Expect 11 mm (0.4 in) of precipitation across 2 days, and enjoy an average humidity level of 58%, contributing to the region’s vibrant climate.

October Temperature in Grand Terrace

In October in Grand Terrace, the average temperature is 19°C (66°F). Maximums can reach 37°C (100°F), while minimums can drop as low as 5°C (41°F). Be prepared for a wide range of temperatures to make the most of your travel experience!

October Weather in Grand Terrace: Daily Temperature Highs, Lows, and Averages

The chart illustrates October temperature patterns in Grand Terrace, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Grand Terrace, October typically has an average temperature of 19°C (66°F), with highs reaching up to 37°C (100°F) and lows dropping to around 5°C (41°F).
JanFebMarAprMayJunJulAugSepOctNovDec515154606472787874665951
Data source: Temperature data for Grand Terrace 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.

October Precipitation in Grand Terrace

In Grand Terrace in October, the precipitation amount is 11 mm (0.4 in) over the course of 2 days.

October Precipitation Trends in Grand Terrace

The chart displays monthly precipitation patterns in Grand Terrace, with values for each month alongside October’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how October’s conditions compare to those of other months. In Grand Terrace, October typically receives around 11 mm (0.4 inches) of precipitation spread over approximately 2 days.
JanFebMarAprMayJunJulAugSepOctNovDec70707531183111010112870
Data source: Precipitation data for October generated using information from the Copernicus Climate Change Service.
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October Humidity in Grand Terrace

In Grand Terrace in October, humidity is 58%. With an average temperature of 19°C (66°F), this humidity feels like a mild embrace, creating a pleasantly warm atmosphere that's perfect for leisurely strolls and sightseeing adventures.

October Average Humidity in Grand Terrace

This chart illustrates the average monthly humidity levels in Grand Terrace, with October’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In October, average humidity in Grand Terrace is approximately 58%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec72%77%67%56%46%48%46%42%52%58%66%74%
Data source: Humidity data for October generated using information from the Copernicus Climate Change Service.

October UV Index in Grand Terrace

In Grand Terrace in October, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Grand Terrace.

Maximum UV Index Levels in Grand Terrace for October

The chart shows the monthly maximum UV Index (UVI) for Grand Terrace in October, 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 October, the maximum UV index in Grand Terrace typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec469101112121110854
Data source: Grand Terrace October 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 October Weather in Grand Terrace Compares to Other Months

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

This table compares monthly weather conditions in Grand Terrace, showing how October’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather11°C (51°F)70 mm (2.8 inches)72%moderate
February Weather11°C (52°F)70 mm (2.7 inches)77%high
March Weather12°C (54°F)75 mm (2.9 inches)67%very high
April Weather16°C (61°F)31 mm (1.2 inches)56%very high
May Weather18°C (64°F)18 mm (0.7 inches)46%extreme
June Weather22°C (72°F)3 mm (0.1 inches)48%extreme
July Weather26°C (78°F)11 mm (0.4 inches)46%extreme
August Weather26°C (79°F)10 mm (0.4 inches)42%extreme
September Weather23°C (74°F)10 mm (0.4 inches)52%very high
October Weather19°C (66°F)11 mm (0.4 inches)58%very high
November Weather15°C (59°F)28 mm (1.1 inches)66%moderate
December Weather11°C (51°F)70 mm (2.7 inches)74%moderate

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