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September Weather in Twin Lake, United States

Last updated: June 24, 2025

In Twin Lake, United States, the average temperature in September hovers around 19°C (66°F), with temperatures ranging from a cool 5°C (41°F) to a warm 31°C (88°F). During this month, you can expect an average precipitation of 107 mm (4.2 in) spread across 10 days. The air tends to be quite humid, with an average humidity of 79%, making for a pleasant yet slightly damp atmosphere.

September Temperature in Twin Lake

In September in Twin Lake, the average temperature is 19°C (66°F). Maximums can reach 31°C (88°F), while minimums can drop to as low as 5°C (41°F). Pack versatile clothing to enjoy the varying temperatures while exploring this destination.

September Weather in Twin Lake: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Twin Lake, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Twin Lake, September typically has an average temperature of 19°C (66°F), with highs reaching up to 31°C (88°F) and lows dropping to around 5°C (41°F).
JanFebMarAprMayJunJulAugSepOctNovDec272735445668747265534033
Data source: Temperature data for Twin Lake 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 Twin Lake

In Twin Lake in September, the precipitation amount is 107 mm (4.2 in) accumulated over a period of 10 days.

September Precipitation Trends in Twin Lake

The chart displays monthly precipitation patterns in Twin Lake, 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 Twin Lake, September typically receives around 107 mm (4.2 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec63656510012411956761071316967
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Twin Lake

In Twin Lake in September humidity is 79%. With an average temperature of 19°C (66°F), this humidity feels like a warm embrace, making it feel much warmer than the actual temperature and creating a heavy, sticky atmosphere that can be a bit uncomfortable for traveling.

September Average Humidity in Twin Lake

This chart illustrates the average monthly humidity levels in Twin Lake, 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 Twin Lake is approximately 79%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%87%86%87%82%81%78%79%80%82%87%86%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Twin Lake

In Twin Lake 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 Twin Lake.

Maximum UV Index Levels in Twin Lake for September

The chart shows the monthly maximum UV Index (UVI) for Twin Lake 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 Twin Lake typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec24589101097532
Data source: Twin Lake 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 Twin Lake Compares to Other Months

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

This table compares monthly weather conditions in Twin Lake, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-3°C (27°F)63 mm (2.5 inches)87%low
February Weather-3°C (27°F)65 mm (2.6 inches)87%moderate
March Weather2°C (35°F)65 mm (2.5 inches)86%moderate
April Weather7°C (44°F)100 mm (4.0 inches)87%very high
May Weather13°C (56°F)124 mm (4.9 inches)82%very high
June Weather20°C (68°F)119 mm (4.7 inches)81%very high
July Weather23°C (74°F)56 mm (2.2 inches)78%very high
August Weather22°C (72°F)75 mm (3.0 inches)79%very high
September Weather19°C (66°F)107 mm (4.2 inches)79%high
October Weather12°C (54°F)131 mm (5.2 inches)82%moderate
November Weather4°C (40°F)69 mm (2.7 inches)87%moderate
December Weather1°C (33°F)67 mm (2.6 inches)86%low

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