nomadseason

September Weather in Hayfork, United States

Last updated: June 24, 2025

In September, the average temperature in Hayfork, United States hovers around 18°C (65°F), with a range that can dip as low as 0°C (32°F) and soar up to 37°C (100°F). Expect light showers, with an average precipitation of 13 mm (0.5 in) over 3 days, and enjoy a comfortable average humidity level of 62%.

September Temperature in Hayfork

In September in Hayfork, the average temperature is 18°C (65°F), with maximums reaching up to 37°C (100°F) and minimums dropping as low as 0°C (32°F). Be prepared for a wide range of temperatures when traveling to Hayfork during this time.

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

The chart illustrates September temperature patterns in Hayfork, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Hayfork, September typically has an average temperature of 18°C (65°F), with highs reaching up to 37°C (100°F) and lows dropping to around 0°C (32°F).
JanFebMarAprMayJunJulAugSepOctNovDec394043495564737264544538
Data source: Temperature data for Hayfork generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Hayfork

In Hayfork in September, the precipitation amount is 13 mm (0.5 in) over a span of 3 days.

September Precipitation Trends in Hayfork

The chart displays monthly precipitation patterns in Hayfork, 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 Hayfork, September typically receives around 13 mm (0.5 inches) of precipitation spread over approximately 3 days.
JanFebMarAprMayJunJulAugSepOctNovDec171165133775312231349101125
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Hayfork

In Hayfork in September, humidity is 62%. With an average temperature of 18°C (65°F), this humidity feels like a warm embrace, making outdoor activities enjoyable yet mildly sticky, perfect for leisurely strolls but a bit challenging for vigorous excursions.

September Average Humidity in Hayfork

This chart illustrates the average monthly humidity levels in Hayfork, 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 Hayfork is approximately 62%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%85%85%82%81%79%70%60%62%72%87%86%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Hayfork

In Hayfork 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 Hayfork.

Maximum UV Index Levels in Hayfork for September

The chart shows the monthly maximum UV Index (UVI) for Hayfork 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 Hayfork typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3579111111109743
Data source: Hayfork 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 Hayfork Compares to Other Months

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

This table compares monthly weather conditions in Hayfork, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather4°C (39°F)171 mm (6.7 inches)86%moderate
February Weather4°C (40°F)165 mm (6.5 inches)85%moderate
March Weather6°C (43°F)133 mm (5.2 inches)85%high
April Weather9°C (49°F)77 mm (3.0 inches)82%very high
May Weather13°C (56°F)53 mm (2.1 inches)81%extreme
June Weather18°C (65°F)12 mm (0.5 inches)79%extreme
July Weather23°C (73°F)2 mm (0.1 inches)70%extreme
August Weather22°C (72°F)3 mm (0.1 inches)60%very high
September Weather18°C (65°F)13 mm (0.5 inches)62%very high
October Weather12°C (55°F)49 mm (1.9 inches)72%high
November Weather7°C (46°F)101 mm (4.0 inches)87%moderate
December Weather3°C (38°F)125 mm (4.9 inches)86%moderate

Compare Hayfork's Climate with Cities Worldwide