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September Weather in Haslett, United States

Last updated: June 24, 2025

In Haslett, United States, the average temperature in September hovers around 18°C (65°F), with fluctuations ranging from a cool 1°C (35°F) to a warm 34°C (94°F). During this month, expect about 94 mm (3.7 in) of precipitation over approximately 10 days, and enjoy a high average humidity of 80%.

September Temperature in Haslett

In September in Haslett, the average temperature is 18°C (65°F). Maximums can reach 34°C (94°F), while minimums can dip as low as 1°C (35°F). This variety in temperatures makes it essential for travelers to pack layers to stay comfortable throughout their visit.

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

The chart illustrates September temperature patterns in Haslett, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Haslett, September typically has an average temperature of 18°C (65°F), with highs reaching up to 34°C (94°F) and lows dropping to around 1°C (35°F).
JanFebMarAprMayJunJulAugSepOctNovDec262737466070747265533832
Data source: Temperature data for Haslett 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 Haslett

In Haslett in September, the precipitation amount is 94 mm (3.7 in) over a duration of 10 days.

September Precipitation Trends in Haslett

The chart displays monthly precipitation patterns in Haslett, 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 Haslett, September typically receives around 94 mm (3.7 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec656868901251068266941186759
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Haslett

In Haslett in September, humidity is 80%. With an average temperature of 18°C (65°F), this humidity feels like wandering through a warm, damp blanket, making every step slightly heavy and resulting in a constant sheen of sweat, which can be both refreshing and exhausting for travelers.

September Average Humidity in Haslett

This chart illustrates the average monthly humidity levels in Haslett, 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 Haslett is approximately 80%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%87%85%86%80%80%80%81%80%84%90%86%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Haslett

In Haslett 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 Haslett.

Maximum UV Index Levels in Haslett for September

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

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

This table compares monthly weather conditions in Haslett, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-4°C (26°F)65 mm (2.6 inches)88%low
February Weather-3°C (27°F)68 mm (2.7 inches)87%moderate
March Weather3°C (37°F)68 mm (2.7 inches)85%moderate
April Weather8°C (47°F)89 mm (3.5 inches)86%very high
May Weather15°C (60°F)125 mm (4.9 inches)80%very high
June Weather21°C (70°F)106 mm (4.2 inches)80%very high
July Weather24°C (75°F)82 mm (3.2 inches)80%very high
August Weather22°C (72°F)66 mm (2.6 inches)80%very high
September Weather18°C (65°F)94 mm (3.7 inches)80%high
October Weather12°C (53°F)118 mm (4.6 inches)84%moderate
November Weather4°C (39°F)67 mm (2.6 inches)89%moderate
December Weather0°C (32°F)59 mm (2.3 inches)86%low

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