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September Weather in Morrisville, United States

Last updated: June 24, 2025

In Morrisville, United States, the average temperature in September hovers around 17°C (63°F). Expect a wide temperature range, with minimums plummeting to 1°C (34°F) and maximums soaring up to 33°C (91°F). During this month, precipitation amounts to 94 mm (3.7 in) across 9 days, accompanied by an average humidity of 78%—perfect for that cozy, atmospheric feel!

September Temperature in Morrisville

In September in Morrisville, the average temperature is 17°C (63°F). Maximums can reach 33°C (91°F) and minimums can be as low as 1°C (34°F). Be sure to pack layers to accommodate the wide temperature range while exploring.

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

The chart illustrates September temperature patterns in Morrisville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Morrisville, September typically has an average temperature of 17°C (63°F), with highs reaching up to 33°C (91°F) and lows dropping to around 1°C (34°F).
JanFebMarAprMayJunJulAugSepOctNovDec242733455866727063533830
Data source: Temperature data for Morrisville 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 Morrisville

In Morrisville in September, the precipitation amount reaches 94 mm (3.7 in) over the course of 9 days.

September Precipitation Trends in Morrisville

The chart displays monthly precipitation patterns in Morrisville, 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 Morrisville, September typically receives around 94 mm (3.7 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec961039812413212318513694172115108
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Morrisville

In Morrisville in September, humidity is 78%. With an average temperature of 17°C (63°F), this humidity feels like a warm, enveloping blanket, making traveling slightly uncomfortable as you navigate the sticky air, prompting the need for frequent breaks in cooler, shaded areas.

September Average Humidity in Morrisville

This chart illustrates the average monthly humidity levels in Morrisville, 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 Morrisville is approximately 78%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec90%90%87%88%82%79%78%76%78%84%89%86%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Morrisville

In Morrisville 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 Morrisville.

Maximum UV Index Levels in Morrisville for September

The chart shows the monthly maximum UV Index (UVI) for Morrisville 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 Morrisville typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3468910998632
Data source: Morrisville 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 Morrisville Compares to Other Months

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

This table compares monthly weather conditions in Morrisville, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-4°C (25°F)96 mm (3.8 inches)90%moderate
February Weather-3°C (27°F)103 mm (4.1 inches)90%moderate
March Weather1°C (34°F)98 mm (3.8 inches)87%high
April Weather7°C (45°F)124 mm (4.9 inches)88%very high
May Weather14°C (58°F)132 mm (5.2 inches)82%very high
June Weather19°C (67°F)123 mm (4.9 inches)79%very high
July Weather22°C (72°F)185 mm (7.3 inches)78%very high
August Weather21°C (70°F)136 mm (5.4 inches)76%very high
September Weather17°C (63°F)94 mm (3.7 inches)78%very high
October Weather11°C (53°F)172 mm (6.8 inches)84%high
November Weather3°C (38°F)115 mm (4.5 inches)89%moderate
December Weather-1°C (30°F)108 mm (4.3 inches)86%low

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