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October Weather in Saint Peters, United States

Last updated: June 24, 2025

In October, the average temperature in Saint Peters, United States hovers around 15°C (59°F), offering a mild climate. However, be prepared for temperature swings, with a minimum of -3°C (26°F) and a maximum reaching 33°C (92°F). Expect about 110 mm (4.3 in) of precipitation spread across 11 days, contributing to an average humidity level of 76%. Whether you're planning outdoor activities or cozy indoor pursuits, this weather blends refreshing coolness with occasional warmth.

October Temperature in Saint Peters

In October in Saint Peters, the average temperature is 15°C (59°F). The maximum can reach 33°C (92°F), and the minimum can be as low as -3°C (26°F). This wide temperature range makes Saint Peters an exciting destination for travelers, offering both warm days and cool nights for a variety of activities.

October Weather in Saint Peters: Daily Temperature Highs, Lows, and Averages

The chart illustrates October temperature patterns in Saint Peters, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Saint Peters, October typically has an average temperature of 15°C (59°F), with highs reaching up to 33°C (92°F) and lows dropping to around -3°C (26°F).
JanFebMarAprMayJunJulAugSepOctNovDec323546556776797672594439
Data source: Temperature data for Saint Peters 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 Saint Peters

In Saint Peters in October, the precipitation amount is 110 mm (4.3 in) spread over 11 days.

October Precipitation Trends in Saint Peters

The chart displays monthly precipitation patterns in Saint Peters, 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 Saint Peters, October typically receives around 110 mm (4.3 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec72781281211458497139561106852
Data source: Precipitation data for October generated using information from the Copernicus Climate Change Service.
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October Humidity in Saint Peters

In Saint Peters in October humidity is 76%. With an average temperature of 15°C (59°F), this humidity feels like a heavy blanket wrapping around you, making outdoor activities less enjoyable and often leading to a quick sense of fatigue while traveling.

October Average Humidity in Saint Peters

This chart illustrates the average monthly humidity levels in Saint Peters, 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 Saint Peters is approximately 76%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%80%80%80%82%83%81%80%76%76%85%86%
Data source: Humidity data for October generated using information from the Copernicus Climate Change Service.

October UV Index in Saint Peters

In Saint Peters in October, the maximum UV index is 6, which corresponds to a high Exposure Category. The time to burn is approximately 25 minutes. To find the hourly UV index in Saint Peters, you can refer to this Hourly UV Index in Saint Peters.

Maximum UV Index Levels in Saint Peters for October

The chart shows the monthly maximum UV Index (UVI) for Saint Peters 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 Saint Peters typically reaches 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3569101111109653
Data source: Saint Peters 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 Saint Peters Compares to Other Months

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

This table compares monthly weather conditions in Saint Peters, showing how October’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather0°C (32°F)72 mm (2.9 inches)82%moderate
February Weather2°C (35°F)78 mm (3.1 inches)80%moderate
March Weather8°C (47°F)128 mm (5.0 inches)80%high
April Weather13°C (55°F)121 mm (4.8 inches)80%very high
May Weather19°C (67°F)145 mm (5.7 inches)82%very high
June Weather25°C (76°F)84 mm (3.3 inches)83%extreme
July Weather26°C (80°F)97 mm (3.8 inches)81%extreme
August Weather24°C (76°F)139 mm (5.5 inches)80%very high
September Weather22°C (72°F)56 mm (2.2 inches)76%very high
October Weather15°C (59°F)110 mm (4.3 inches)76%high
November Weather7°C (44°F)68 mm (2.7 inches)85%moderate
December Weather4°C (39°F)52 mm (2.1 inches)86%moderate

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