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September Weather in Hannibal, United States

Last updated: June 24, 2025

In September, the average temperature in Hannibal, United States hovers around 18°C (65°F). You can expect a minimum of 4°C (40°F) and a maximum soaring to 33°C (91°F). During this time, 90 mm (3.5 in) of precipitation typically falls over 10 days, with an average humidity level of 78%.

September Temperature in Hannibal

In September, in Hannibal, the average temperature is 18°C (65°F). Maximum temperatures can reach 33°C (91°F), while minimums can drop as low as 4°C (40°F). This variation makes Hannibal an ideal destination, offering pleasant days for outdoor activities and cooler evenings for cozy relaxation.

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

The chart illustrates September temperature patterns in Hannibal, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Hannibal, September typically has an average temperature of 18°C (65°F), with highs reaching up to 33°C (91°F) and lows dropping to around 4°C (40°F).
JanFebMarAprMayJunJulAugSepOctNovDec272935455766737265554033
Data source: Temperature data for Hannibal 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 Hannibal

In Hannibal in September, the precipitation amount is 90 mm (3.5 in) over the course of 10 days.

September Precipitation Trends in Hannibal

The chart displays monthly precipitation patterns in Hannibal, 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 Hannibal, September typically receives around 90 mm (3.5 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec9697871211219318512390169113116
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Hannibal

In Hannibal in September, humidity is 78%. With an average temperature of 18°C (65°F), this humidity feels like a warm, enveloping blanket, making travel quite muggy and potentially uncomfortable, as it can leave you feeling sticky and fatigued more quickly than usual.

September Average Humidity in Hannibal

This chart illustrates the average monthly humidity levels in Hannibal, 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 Hannibal is approximately 78%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec90%90%87%88%82%79%78%76%78%84%89%86%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Hannibal

In Hannibal in September, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Hannibal.

Maximum UV Index Levels in Hannibal for September

The chart shows the monthly maximum UV Index (UVI) for Hannibal 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 Hannibal typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3468910997632
Data source: Hannibal 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 Hannibal Compares to Other Months

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

This table compares monthly weather conditions in Hannibal, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-3°C (27°F)96 mm (3.8 inches)90%moderate
February Weather-2°C (29°F)96 mm (3.8 inches)90%moderate
March Weather1°C (35°F)87 mm (3.4 inches)87%high
April Weather7°C (45°F)121 mm (4.8 inches)88%very high
May Weather14°C (57°F)121 mm (4.8 inches)82%very high
June Weather19°C (66°F)93 mm (3.7 inches)79%very high
July Weather23°C (73°F)185 mm (7.3 inches)78%very high
August Weather22°C (72°F)123 mm (4.8 inches)76%very high
September Weather18°C (65°F)90 mm (3.5 inches)78%high
October Weather13°C (55°F)169 mm (6.7 inches)84%high
November Weather5°C (41°F)113 mm (4.5 inches)89%moderate
December Weather0°C (33°F)116 mm (4.5 inches)86%low

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