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September Weather in Grimsby, United Kingdom

Last updated: August 27, 2025

In Grimsby, United Kingdom, the average temperature in September hovers around 15°C (58°F), offering a pleasant climate. Expect a chilly minimum of 5°C (40°F) and a delightful maximum of 27°C (81°F). While enjoying the weather, be prepared for some rain, as 65 mm (2.5 in) of precipitation may fall over 11 days. Don't forget, the air is often moist, with an average humidity of 84%.

September Temperature in Grimsby

In September in Grimsby, the average temperature is 15°C (58°F). Maximum temperatures can reach 27°C (81°F), while the minimum can drop as low as 5°C (40°F). Be prepared for a variety of weather conditions when traveling during this time.

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

The chart illustrates September temperature patterns in Grimsby, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Grimsby, September typically has an average temperature of 15°C (58°F), with highs reaching up to 27°C (81°F) and lows dropping to around 5°C (40°F).
JanFebMarAprMayJunJulAugSepOctNovDec414245475359636358534642
Data source: Temperature data for Grimsby 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 Grimsby

In Grimsby in September, the precipitation amount is 65 mm (2.5 in) over a span of 11 days.

September Precipitation Trends in Grimsby

The chart displays monthly precipitation patterns in Grimsby, 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 Grimsby, September typically receives around 65 mm (2.5 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec435658336678788165756268
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Grimsby

In Grimsby in September humidity is 84%. With an average temperature of 15°C (58°F), this humidity feels like a heavy blanket enveloping you, making travel feel like a slow, sticky journey where every step requires extra effort.

September Average Humidity in Grimsby

This chart illustrates the average monthly humidity levels in Grimsby, 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 Grimsby is approximately 84%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec89%87%86%85%83%83%80%78%84%88%89%88%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Grimsby

In Grimsby in September, the maximum UV index reaches 5, which corresponds to a moderate Exposure Category. Under these conditions, the estimated time to burn is approximately 30 minutes. For more details, you can check the Hourly UV Index in Grimsby.

Maximum UV Index Levels in Grimsby for September

The chart shows the monthly maximum UV Index (UVI) for Grimsby 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 Grimsby typically reaches 5, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec123578875321
Data source: Grimsby 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 Grimsby Compares to Other Months

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

This table compares monthly weather conditions in Grimsby, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather5°C (41°F)43 mm (1.7 inches)89%low
February Weather6°C (43°F)56 mm (2.2 inches)87%low
March Weather7°C (45°F)58 mm (2.3 inches)86%moderate
April Weather9°C (48°F)33 mm (1.3 inches)85%moderate
May Weather12°C (54°F)66 mm (2.6 inches)83%high
June Weather15°C (60°F)78 mm (3.1 inches)83%very high
July Weather17°C (63°F)78 mm (3.1 inches)79%very high
August Weather17°C (63°F)81 mm (3.2 inches)78%high
September Weather15°C (58°F)65 mm (2.5 inches)84%moderate
October Weather11°C (53°F)75 mm (2.9 inches)88%moderate
November Weather8°C (47°F)62 mm (2.4 inches)89%low
December Weather6°C (42°F)68 mm (2.7 inches)88%low

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