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September Weather in Johnstonville, United States

Last updated: June 24, 2025

In September, the average temperature in Johnstonville, United States hovers around 18°C (64°F). Temperature extremes can range from a chilly -1°C (31°F) to a sweltering 36°C (97°F). The region experiences about 16 mm (0.6 in) of precipitation over 3 days, accompanied by an average humidity of 46%.

September Temperature in Johnstonville

In September, in Johnstonville, the average temperature is 18°C (64°F). The maximum can reach 36°C (97°F), and the minimum can be as low as -1°C (31°F). Be prepared for a wide range of temperatures when traveling to Johnstonville in September.

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

The chart illustrates September temperature patterns in Johnstonville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Johnstonville, September typically has an average temperature of 18°C (64°F), with highs reaching up to 36°C (97°F) and lows dropping to around -1°C (31°F).
JanFebMarAprMayJunJulAugSepOctNovDec323337465566757364504031
Data source: Temperature data for Johnstonville 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 Johnstonville

In Johnstonville in September, the precipitation amount is 16 mm (0.6 in), spread over a duration of 3 days.

September Precipitation Trends in Johnstonville

The chart displays monthly precipitation patterns in Johnstonville, 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 Johnstonville, September typically receives around 16 mm (0.6 inches) of precipitation spread over approximately 3 days.
JanFebMarAprMayJunJulAugSepOctNovDec8893753840107717323963
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Johnstonville

In Johnstonville in September humidity is 46%. With an average temperature of 18°C (64°F), this humidity feels like a pleasant and comfortable experience for traveling, allowing for enjoyable outdoor activities without feeling overly sticky or oppressive.

September Average Humidity in Johnstonville

This chart illustrates the average monthly humidity levels in Johnstonville, 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 Johnstonville is approximately 46%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%87%86%83%72%67%56%42%46%67%86%86%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Johnstonville

In Johnstonville 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 Johnstonville.

Maximum UV Index Levels in Johnstonville for September

The chart shows the monthly maximum UV Index (UVI) for Johnstonville 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 Johnstonville typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec4589111211119743
Data source: Johnstonville 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 Johnstonville Compares to Other Months

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

This table compares monthly weather conditions in Johnstonville, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather0°C (32°F)88 mm (3.5 inches)86%moderate
February Weather0°C (33°F)93 mm (3.7 inches)87%moderate
March Weather3°C (38°F)75 mm (3.0 inches)86%very high
April Weather8°C (47°F)38 mm (1.5 inches)83%very high
May Weather13°C (56°F)40 mm (1.6 inches)72%extreme
June Weather19°C (67°F)10 mm (0.4 inches)67%extreme
July Weather24°C (75°F)7 mm (0.3 inches)56%extreme
August Weather23°C (73°F)7 mm (0.3 inches)42%extreme
September Weather18°C (64°F)16 mm (0.6 inches)46%very high
October Weather10°C (51°F)32 mm (1.2 inches)67%high
November Weather5°C (41°F)39 mm (1.5 inches)86%moderate
December Weather-1°C (31°F)63 mm (2.5 inches)86%moderate

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