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September Weather in Twain Harte, United States

Last updated: June 24, 2025

In September, the average temperature in Twain Harte, United States hovers around 21°C (70°F). Expect a range that can dip to a chilly 6°C (42°F) and soar up to a scorching 39°C (103°F). Rainfall is minimal, with averages of just 6 mm (0.2 in) spread over 1 day, while the average humidity sits comfortably at 55%.

September Temperature in Twain Harte

In September in Twain Harte, the average temperature is 21°C (70°F). Maximums can reach 39°C (103°F), while minimums can drop as low as 6°C (42°F). Be prepared for a wide range of temperatures when traveling to Twain Harte during this month.

September Weather in Twain Harte: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Twain Harte, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Twain Harte, September typically has an average temperature of 21°C (70°F), with highs reaching up to 39°C (103°F) and lows dropping to around 6°C (42°F).
JanFebMarAprMayJunJulAugSepOctNovDec434447546070777670595043
Data source: Temperature data for Twain Harte 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 Twain Harte

In Twain Harte in September, the precipitation amount is 6 mm (0.2 in) over the course of 1 day.

September Precipitation Trends in Twain Harte

The chart displays monthly precipitation patterns in Twain Harte, 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 Twain Harte, September typically receives around 6 mm (0.2 inches) of precipitation spread over approximately 1 days.
JanFebMarAprMayJunJulAugSepOctNovDec22322324610262601650105167
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Twain Harte

In Twain Harte in September humidity is 55%. With average temperature 21°C (70°F), this humidity feels like a refreshing embrace, making it comfortable for traveling as long as you stay hydrated and take in the sights at a leisurely pace.

September Average Humidity in Twain Harte

This chart illustrates the average monthly humidity levels in Twain Harte, 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 Twain Harte is approximately 55%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%84%82%78%71%64%59%54%55%62%78%80%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Twain Harte

In Twain Harte 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 Twain Harte.

Maximum UV Index Levels in Twain Harte for September

The chart shows the monthly maximum UV Index (UVI) for Twain Harte 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 Twain Harte typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3589111111109743
Data source: Twain Harte 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 Twain Harte Compares to Other Months

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

This table compares monthly weather conditions in Twain Harte, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather6°C (44°F)222 mm (8.8 inches)82%moderate
February Weather7°C (44°F)223 mm (8.8 inches)84%moderate
March Weather8°C (47°F)246 mm (9.7 inches)82%very high
April Weather12°C (54°F)102 mm (4.0 inches)78%very high
May Weather15°C (60°F)62 mm (2.5 inches)71%extreme
June Weather21°C (70°F)6 mm (0.2 inches)64%extreme
July Weather25°C (78°F)0 mm (0.0 inches)58%extreme
August Weather25°C (77°F)1 mm (0.0 inches)54%very high
September Weather21°C (70°F)6 mm (0.2 inches)55%very high
October Weather15°C (59°F)50 mm (2.0 inches)62%high
November Weather10°C (50°F)105 mm (4.1 inches)78%moderate
December Weather6°C (43°F)167 mm (6.6 inches)80%moderate

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