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September Weather in Newhaven, United Kingdom

Last updated: August 27, 2025

In September, the average temperature in Newhaven, United Kingdom hovers around 16°C (62°F), with a comfortable minimum of 10°C (50°F) and a pleasant maximum of 21°C (71°F). Expect some refreshing rainfall, as the area receives about 67 mm (2.6 in) over an average of 11 days. Additionally, the atmosphere is quite humid, with an average humidity level of 80%, adding a touch of moisture to the air.

September Temperature in Newhaven

In September in Newhaven, the average temperature is 16°C (62°F). The maximum can reach 21°C (71°F), and the minimum can be as low as 10°C (50°F). This mild weather makes Newhaven an ideal destination for travelers seeking comfortable temperatures and pleasant outdoor activities.

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

The chart illustrates September temperature patterns in Newhaven, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Newhaven, September typically has an average temperature of 16°C (62°F), with highs reaching up to 21°C (71°F) and lows dropping to around 10°C (50°F).
JanFebMarAprMayJunJulAugSepOctNovDec454546485359636461575148
Data source: Temperature data for Newhaven 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 Newhaven

In Newhaven in September, the total precipitation amount is 67 mm (2.6 in) over the course of 11 days.

September Precipitation Trends in Newhaven

The chart displays monthly precipitation patterns in Newhaven, 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 Newhaven, September typically receives around 67 mm (2.6 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec798369304865517467133119149
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Newhaven

In Newhaven in September humidity is 80%. With an average temperature of 16°C (62°F), this humidity feels like a warm, muggy embrace, making travel slightly uncomfortable as the air hangs heavy, necessitating frequent hydration and light clothing to stay cool and refreshed.

September Average Humidity in Newhaven

This chart illustrates the average monthly humidity levels in Newhaven, 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 Newhaven is approximately 80%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec91%89%86%85%82%81%76%73%80%89%92%92%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Newhaven

In Newhaven in September, the maximum UV index is 6, which corresponds to a high Exposure Category. The time to burn is approximately 25 minutes. To find the hourly UV index in Newhaven, you can refer to this Hourly UV Index in Newhaven.

Maximum UV Index Levels in Newhaven for September

The chart shows the monthly maximum UV Index (UVI) for Newhaven 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 Newhaven typically reaches 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec224678876421
Data source: Newhaven 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 Newhaven Compares to Other Months

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

This table compares monthly weather conditions in Newhaven, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather7°C (45°F)79 mm (3.1 inches)91%low
February Weather7°C (45°F)83 mm (3.3 inches)89%low
March Weather8°C (47°F)69 mm (2.7 inches)86%moderate
April Weather9°C (49°F)30 mm (1.2 inches)85%high
May Weather12°C (54°F)48 mm (1.9 inches)82%high
June Weather15°C (59°F)65 mm (2.6 inches)81%very high
July Weather17°C (63°F)51 mm (2.0 inches)76%very high
August Weather18°C (64°F)74 mm (2.9 inches)73%high
September Weather16°C (62°F)67 mm (2.6 inches)80%high
October Weather14°C (58°F)133 mm (5.2 inches)89%moderate
November Weather11°C (51°F)119 mm (4.7 inches)92%low
December Weather9°C (48°F)149 mm (5.9 inches)92%low

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