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September Weather in Portslade, United Kingdom

Last updated: August 27, 2025

In Portslade, United Kingdom, the average temperature in September hovers around 16°C (62°F), with a comfortable range that sees minimums of 10°C (50°F) and maximums reaching 22°C (72°F). Prepare for some moisture, as the area experiences 63 mm (2.5 in) of precipitation spread over approximately 11 days. With an average humidity of 82%, it’s wise to embrace the refreshing, albeit damp, atmosphere!

September Temperature in Portslade

In September in Portslade, the average temperature is 16°C (62°F). Maximum temperatures can reach 22°C (72°F), while the minimum can drop to as low as 10°C (50°F). Travelers should be prepared for mild weather, making it an ideal time for outdoor activities and exploration.

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

The chart illustrates September temperature patterns in Portslade, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Portslade, September typically has an average temperature of 16°C (62°F), with highs reaching up to 22°C (72°F) and lows dropping to around 10°C (50°F).
JanFebMarAprMayJunJulAugSepOctNovDec454546495459636462575148
Data source: Temperature data for Portslade 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 Portslade

In Portslade in September, the precipitation amount is 63 mm (2.5 in) during a total of 11 days.

September Precipitation Trends in Portslade

The chart displays monthly precipitation patterns in Portslade, 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 Portslade, September typically receives around 63 mm (2.5 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec747867294765527463129110138
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Portslade

In Portslade in September, humidity is 82%. With an average temperature of 16°C (62°F), this humidity feels like a blanket of warmth enveloping you, making traveling feel sticky and heavy as you navigate through the air.

September Average Humidity in Portslade

This chart illustrates the average monthly humidity levels in Portslade, 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 Portslade is approximately 82%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec91%89%86%85%79%81%71%76%82%91%92%92%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Portslade

In Portslade 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 Portslade, you can refer to this Hourly UV Index in Portslade.

Maximum UV Index Levels in Portslade for September

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

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

This table compares monthly weather conditions in Portslade, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather7°C (45°F)74 mm (2.9 inches)91%low
February Weather7°C (45°F)78 mm (3.1 inches)89%low
March Weather8°C (47°F)67 mm (2.6 inches)86%moderate
April Weather9°C (49°F)29 mm (1.2 inches)85%high
May Weather12°C (54°F)47 mm (1.8 inches)79%high
June Weather15°C (59°F)65 mm (2.6 inches)80%very high
July Weather17°C (63°F)52 mm (2.0 inches)71%very high
August Weather18°C (64°F)74 mm (2.9 inches)76%high
September Weather16°C (62°F)63 mm (2.5 inches)82%high
October Weather14°C (58°F)129 mm (5.1 inches)90%moderate
November Weather11°C (52°F)110 mm (4.3 inches)92%low
December Weather9°C (48°F)138 mm (5.4 inches)92%low

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