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September Weather in Nelson, United States

Last updated: June 24, 2025

In September, the average temperature in Nelson, United States hovers around 21°C (71°F), offering a comfortable climate for outdoor activities. However, temperatures can vary significantly, with a minimum of 4°C (40°F) and a maximum reaching up to 37°C (99°F). Expect about 69 mm (2.7 in) of precipitation spread over 6 days, contributing to an average humidity level of 77%. Whether you’re basking in the warmth or bracing for a refreshing rain, be prepared for the dynamic weather of September!

September Temperature in Nelson

In September in Nelson, the average temperature is 21°C (71°F). Maximums can reach 37°C (99°F), and minimums can be as low as 4°C (40°F). Pack accordingly to enjoy a range of weather while traveling!

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

The chart illustrates September temperature patterns in Nelson, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Nelson, September typically has an average temperature of 21°C (71°F), with highs reaching up to 37°C (99°F) and lows dropping to around 4°C (40°F).
JanFebMarAprMayJunJulAugSepOctNovDec282842516376797570534133
Data source: Temperature data for Nelson 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 Nelson

In Nelson in September, the precipitation amount is 69 mm (2.7 in) over a period of 6 days.

September Precipitation Trends in Nelson

The chart displays monthly precipitation patterns in Nelson, 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 Nelson, September typically receives around 69 mm (2.7 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec2822864517386668569882239
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Nelson

In Nelson in September, humidity is 77%. With an average temperature of 21°C (71°F), this humidity feels like a warm embrace that envelops you, making it both refreshing and slightly heavy, which can be a bit tiring for traveling.

September Average Humidity in Nelson

This chart illustrates the average monthly humidity levels in Nelson, 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 Nelson is approximately 77%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec73%81%69%71%80%83%84%84%77%72%80%79%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Nelson

In Nelson 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 Nelson.

Maximum UV Index Levels in Nelson for September

The chart shows the monthly maximum UV Index (UVI) for Nelson 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 Nelson typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3569101111108643
Data source: Nelson 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 Nelson Compares to Other Months

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

This table compares monthly weather conditions in Nelson, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (28°F)28 mm (1.1 inches)73%moderate
February Weather-2°C (28°F)22 mm (0.9 inches)81%moderate
March Weather6°C (43°F)86 mm (3.4 inches)69%high
April Weather11°C (51°F)45 mm (1.8 inches)71%very high
May Weather17°C (63°F)173 mm (6.8 inches)80%very high
June Weather24°C (76°F)86 mm (3.4 inches)83%extreme
July Weather26°C (79°F)66 mm (2.6 inches)84%extreme
August Weather24°C (76°F)85 mm (3.3 inches)84%very high
September Weather21°C (71°F)69 mm (2.7 inches)77%very high
October Weather12°C (53°F)88 mm (3.5 inches)72%high
November Weather5°C (42°F)22 mm (0.9 inches)80%moderate
December Weather1°C (33°F)39 mm (1.5 inches)79%moderate

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