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September Weather in Saint Jo, United States

Last updated: June 24, 2025

In September, the average temperature in Saint Jo, United States hovers around 25°C (78°F). However, be prepared for fluctuations, as temperatures can dip to a cool 9°C (49°F) and soar to a scorching 38°C (100°F). Rain is also a factor, with an average precipitation of 90 mm (3.6 in) spread over 7 days, contributing to an average humidity level of 64%.

September Temperature in Saint Jo

In September in Saint Jo, the average temperature is 25°C (78°F). Maximums can reach 38°C (100°F), and minimums can be as low as 9°C (49°F). This weather makes Saint Jo an ideal destination for travelers seeking warm days and cool nights.

September Weather in Saint Jo: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Saint Jo, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Saint Jo, September typically has an average temperature of 25°C (78°F), with highs reaching up to 38°C (100°F) and lows dropping to around 9°C (49°F).
JanFebMarAprMayJunJulAugSepOctNovDec444658637381858478665449
Data source: Temperature data for Saint Jo 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 Saint Jo

In Saint Jo in September, the total precipitation amount is 90 mm (3.6 in) over a period of 7 days.

September Precipitation Trends in Saint Jo

The chart displays monthly precipitation patterns in Saint Jo, 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 Saint Jo, September typically receives around 90 mm (3.6 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec47728787119793677911144451
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Saint Jo

In Saint Jo in September, humidity is 64%. With an average temperature of 25°C (78°F), this humidity feels like a warm blanket wrapping around you, making it feel much warmer than the actual temperature, which can be a bit stifling for traveling but also adds a lush, tropical feel to the atmosphere.

September Average Humidity in Saint Jo

This chart illustrates the average monthly humidity levels in Saint Jo, 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 Saint Jo is approximately 64%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec77%76%74%75%80%80%75%67%64%70%82%85%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Saint Jo

In Saint Jo in September, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Saint Jo.

Maximum UV Index Levels in Saint Jo for September

The chart shows the monthly maximum UV Index (UVI) for Saint Jo 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 Saint Jo typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec468101111111110864
Data source: Saint Jo 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 Saint Jo Compares to Other Months

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

This table compares monthly weather conditions in Saint Jo, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather7°C (44°F)47 mm (1.9 inches)77%moderate
February Weather8°C (46°F)72 mm (2.8 inches)76%high
March Weather14°C (58°F)87 mm (3.4 inches)74%very high
April Weather17°C (64°F)87 mm (3.4 inches)75%very high
May Weather23°C (73°F)119 mm (4.7 inches)80%extreme
June Weather27°C (81°F)79 mm (3.1 inches)80%extreme
July Weather29°C (85°F)36 mm (1.4 inches)75%extreme
August Weather29°C (84°F)77 mm (3.0 inches)67%extreme
September Weather25°C (78°F)90 mm (3.6 inches)64%very high
October Weather19°C (66°F)114 mm (4.5 inches)70%very high
November Weather12°C (54°F)44 mm (1.7 inches)82%high
December Weather9°C (49°F)51 mm (2.0 inches)85%moderate

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