nomadseason

September Weather in Haymarket, United States

Last updated: June 24, 2025

In Haymarket, United States, the average temperature in September is a pleasant 22°C (72°F). Expect minimums dipping to 4°C (39°F) and maximums soaring up to 37°C (98°F). With an average humidity of 68%, you might also experience 97 mm (3.8 in) of precipitation over about 11 days. Prepare for a dynamic climate that's both refreshing and invigorating!

September Temperature in Haymarket

In September in Haymarket, the average temperature is 22°C (72°F). Maximums can reach 37°C (98°F), while minimums can drop to as low as 4°C (39°F). Travelers should be prepared for a range of temperatures, making it essential to pack accordingly for both warm and cool conditions.

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

The chart illustrates September temperature patterns in Haymarket, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Haymarket, September typically has an average temperature of 22°C (72°F), with highs reaching up to 37°C (98°F) and lows dropping to around 4°C (39°F).
JanFebMarAprMayJunJulAugSepOctNovDec374147576675817771614640
Data source: Temperature data for Haymarket 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 Haymarket

In Haymarket in September, the total precipitation amount is 97 mm (3.8 in) over the course of 11 days.

September Precipitation Trends in Haymarket

The chart displays monthly precipitation patterns in Haymarket, 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 Haymarket, September typically receives around 97 mm (3.8 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec59937710212310497132971078588
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Haymarket

In Haymarket in September humidity is 68%. With an average temperature of 22°C (72°F), this humidity feels like a warm embrace, slightly stifling but still manageable for traveling, creating an atmosphere that encourages leisurely outdoor activities while prompting occasional breaks for refreshment.

September Average Humidity in Haymarket

This chart illustrates the average monthly humidity levels in Haymarket, 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 Haymarket is approximately 68%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%86%86%84%78%79%70%59%68%80%87%85%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Haymarket

In Haymarket in September, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Haymarket.

Maximum UV Index Levels in Haymarket for September

The chart shows the monthly maximum UV Index (UVI) for Haymarket 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 Haymarket typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec357910101098753
Data source: Haymarket 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 Haymarket Compares to Other Months

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

This table compares monthly weather conditions in Haymarket, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather3°C (37°F)59 mm (2.3 inches)86%moderate
February Weather5°C (41°F)92 mm (3.6 inches)86%moderate
March Weather8°C (47°F)77 mm (3.0 inches)86%high
April Weather14°C (57°F)102 mm (4.0 inches)84%very high
May Weather19°C (66°F)123 mm (4.8 inches)78%very high
June Weather24°C (75°F)104 mm (4.1 inches)79%very high
July Weather27°C (81°F)97 mm (3.8 inches)70%very high
August Weather25°C (77°F)132 mm (5.2 inches)59%very high
September Weather22°C (72°F)97 mm (3.8 inches)68%very high
October Weather16°C (62°F)107 mm (4.2 inches)80%high
November Weather8°C (47°F)85 mm (3.3 inches)86%moderate
December Weather5°C (41°F)88 mm (3.5 inches)85%moderate

Compare Haymarket's Climate with Cities Worldwide