September Weather in Brighton, United Kingdom

Last updated: March 17, 2025

In Brighton, United Kingdom, September showcases a mild climate, with average temperatures hovering around 16°C (62°F), peaking at a comfortable 22°C (72°F) during warmer days. As autumn approaches, nighttime temperatures can dip to a cool 10°C (50°F), inviting cozy evenings. The month is characterized by a moderate precipitation total of 63 mm (2.5 in) spread across 11 days, contributing to the region's lush scenery. Coupled with a relative humidity of 82%, September in Brighton offers a refreshing, breezy atmosphere perfect for exploring the seaside charm and vibrant urban life.

September Temperature in Brighton

September in Brighton ushers in a pleasant transition as summer gives way to autumn. With temperatures ranging from a comfortable 10°C (50°F) to a warm 22°C (72°F), the month showcases an average of 16°C (62°F), making it a delightful time to explore the seaside city. The days are often sunny and inviting, encouraging outdoor activities and beach strolls before the chilling autumn air sets in. As the month progresses, a subtle decline from the peak warmth of summer is evident, yet the lingering mildness invites locals and tourists alike to savor the vibrant atmosphere, hinting at the cooler months ahead while still basking in the last remnants of summer warmth.

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

The chart illustrates September temperature patterns in Brighton, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec454546495459636462575148
Data source: Temperature data for Brighton generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Brighton

September in Brighton sees a moderate precipitation total of 63 mm (2.5 in), falling over 11 days. This amount marks a slight decrease compared to the summer months, reflecting a transition into the wetter autumn season. Interestingly, as the year progresses, Brighton typically witnesses an uptick in both total rainfall and the number of rainy days, with October expected to bring significantly more moisture, averaging 129 mm (5.1 in) over 16 days. This trend illustrates how September often serves as a bridge between the drier summer and the more drizzly autumn, inviting a gradual shift from sunny days to the cozy anticipation of fall.

September Precipitation Trends in Brighton

The chart displays monthly precipitation patterns in Brighton, 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.
JanFebMarAprMayJunJulAugSepOctNovDec747867294765527463129110138
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Brighton

In September, Brighton experiences a humidity level of 82%, marking a slight increase from the drier summer months of July and August, which recorded 71% and 76% respectively. This rise is part of a trend where humidity begins to climb again as the region transitions into autumn. Notably, September’s humidity is still lower than the winter months, which typically see levels peaking at 90% in October and 92% in both November and December. With the lingering warmth of summer, September offers a balance, making it a uniquely refreshing month before the chill fully sets in.

September Average Humidity in Brighton

This chart illustrates the average monthly humidity levels in Brighton, with September's data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, allowing you to see how September's humidity levels compare to other months.
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 Brighton

In September, Brighton experiences a UV Index of 6, falling into the high exposure category, which means sun protection is essential, especially during peak hours. This month's UV levels signal a slight decline from the intense summer months of July and August, where the index hovered at a robust 8. However, with a burn time of just 25 minutes, the risk of skin damage remains significant, urging residents and visitors alike to embrace sun safety practices. As autumn approaches, it's critical to remain vigilant about UV exposure, reflecting a gradual transition in Brighton's UV landscape from the sizzling summer sun back to more moderate levels in October. For detailed insights, visit Brighton UV Index.

Maximum UV Index Levels in Brighton for September

The chart shows the monthly maximum UV Index (UVI) for Brighton 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.
JanFebMarAprMayJunJulAugSepOctNovDec224678876421
Data source: Brighton 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.

September Sunshine in Brighton

As summer wanes and autumn approaches, September in Brighton embraces a delightful transition with 324 hours of sunshine. This month stands out as a harmonious balance between the sun-drenched days of July and August, which boast 424 and 388 hours respectively, and the dimmer glow of October's 255 hours. The sun's generous presence throughout the year highlights a clear trend: Brighton flourishes in sunlight during the warmer months. September, with its comfortable temperatures and ample sunshine, offers an inviting opportunity for both locals and tourists to bask in the beauty of this coastal gem before the darker days of fall set in.

Monthly Sunshine Duration in Brighton: September Highlighted

The September sunshine duration represents the total number of hours Brighton experiences direct sunlight during the month of September, excluding cloudy or obstructed periods. This chart compares the sunshine duration of September with the other months of the year.
JanFebMarAprMayJunJulAugSepOctNovDec103h153h228h347h416h411h424h388h324h255h159h120h
Data source: Brighton September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Brighton During September

In Brighton, United Kingdom, September offers a moderate chance of sunny weather, with 37% likelihood of sunshine. This marks a slight dip from the summer months, where July and August boast probabilities of 42% and 38%, respectively. As the seasons transition, it's evident that September still holds its own, providing a cheerful outlook compared to the chillier months ahead, notably October's 31% chance. While it may not compare to the sunny peaks of April (59%), it certainly retains a sense of warmth, making it a lovely time to explore the coastal charm and vibrant atmosphere that Brighton has to offer.

Percentage of Sunny Days in September in Brighton

The chart illustrates the percentage of sunny days in Brighton throughout the year, with September highlighted. It highlights the variation in sunshine across each month and provides an overview of the typical frequency of sunny days, offering insights into how often Brighton experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec22%25%42%59%43%32%42%38%37%31%37%21%
Data source: Brighton September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Brighton in September

As September unfolds in Brighton, United Kingdom, daylight begins to recede with an average of 12 hours of light, marking a gentle transition away from the long summer days. This decrease follows the peak summer month of June, which boasted an impressive 16 hours of daylight, and gradually leads into October's shorter days, where daylight returns to 10 hours. Interestingly, September's daylight is still notable, maintaining a balance between the brighter summer months and the dimming leads of autumn, making it an ideal time for enjoyable outdoor activities before the chill sets in. As the season progresses, the rhythm of daylight serves as a reminder of nature's cyclical beauty, inviting both exploration and reflection.

Average Daylight Hours in Brighton for September

The chart illustrates the variation in daylight duration in Brighton throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec8h 29m10h 1m11h 55m13h 51m15h 32m16h 25m15h 57m14h 26m12h 34m10h 38m8h 55m8h
Data source: Brighton daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Brighton

As summer fades into autumn, September in Brighton brings a gentle shift in the breeze, with an average wind speed of 5.6 m/s (13 mph). This marks a slight decrease from the more blustery days of August, which saw winds at 6.3 m/s (14 mph). Notably, September’s winds are among the calmest of the year, echoing the tranquil transition of the season. This pattern reflects a broader trend where wind speeds gradually wane during the late summer months, culminating in a resurgence with October's winds picking up to 7.7 m/s (17 mph). Whether you’re enjoying a stroll along the seafront or simply basking in the golden autumn light, September's subtler winds create a serene backdrop perfect for embracing the changing seasons.

Average September Wind Speed in Brighton

The chart displays monthly wind speed patterns in Brighton, with values for each month shown alongside September's data, which is highlighted for easy comparison. It illustrates the average wind speed, offering insights into how September's wind conditions compare to the rest of the year.
JanFebMarAprMayJunJulAugSepOctNovDec7.98.26.85.87.04.65.46.35.6 m/s7.76.77.9
Data source: Brighton September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Brighton Compares to Other Months

The weather in Brighton changes throughout the year, offering a unique experience in each season. Below is a month-by-month comparison of September's weather with other months, highlighting differences in temperature, precipitation, and other key factors. Click on each section to discover seasonal trends in Brighton and find detailed weather information for every month.

When comparing the weather in September and January, notable differences emerge in temperature and precipitation. September enjoys milder temperatures, with averages ranging from a minimum of 10°C (50°F) to a maximum of 22°C (72°F), while January is much cooler, with averages fluctuating between 1°C (35°F) and 13°C (55°F). Precipitation levels are fairly close, with September receiving around 63 mm (2.5 in) over 11 days and January slightly higher at 74 mm (2.9 in) across 12 days. Humidity levels also rise in January, reaching 91% compared to September's 82%. For a detailed look at January weather in Brighton, you can visit Brighton weather in January.

September and February present contrasting weather conditions. In September, temperatures range from a mild 10°C (50°F) at night to a pleasant 22°C (72°F) during the day, with an average of 16°C (62°F). This month sees approximately 63 mm (2.5 in) of rain over about 11 days, and the humidity level is relatively comfortable at 82%. In contrast, February is notably colder with temperatures dipping to a minimum of -1°C (30°F) and averaging only 7°C (45°F), peaking at 12°C (54°F). The month experiences higher precipitation, totaling 78 mm (3.1 in) across 15 days, and the humidity rises to 89%, creating a markedly damp atmosphere. For more detailed information about February weather, visit Brighton weather in February.

September and March present distinct contrasts in weather conditions. September features milder temperatures, with an average of 16°C (62°F) and a maximum of 22°C (72°F), while March sees chillier conditions, averaging only 8°C (47°F) and peaking at 13°C (55°F). Precipitation levels are somewhat similar, with September receiving 63 mm (2.5 in) over 11 days and March slightly higher at 67 mm (2.6 in) across 14 days. Additionally, both months experience high humidity, with September at 82% and March a touch higher at 86%. For further details on March weather, you can visit Brighton weather in March.

September typically offers milder temperatures compared to April, with averages around 16°C (62°F) and highs reaching up to 22°C (72°F), while April's average temperature lingers at a cooler 9°C (49°F) with maximums of only 15°C (60°F). Additionally, September experiences higher rainfall, recording about 63 mm (2.5 in) over 11 days, compared to April's lighter precipitation of 29 mm (1.2 in) spread over just 6 days. Humidity remains relatively high in both months, with September at 82% and April slightly higher at 85%. For more detailed insights, you can check Brighton weather in April.

September generally experiences milder temperatures compared to May, with an average of 16°C (62°F) compared to May's 12°C (54°F). The minimum temperature in September, 10°C (50°F), is warmer than May's 6°C (42°F). In terms of maximum temperatures, September reaches 22°C (72°F), while May peaks at 19°C (66°F). Additionally, September sees a bit more rainfall, with 63 mm (2.5 in) over 11 days, compared to May's 47 mm (1.8 in) across 9 days. However, humidity levels remain fairly close, with September at 82% and May slightly lower at 79%. For more detailed information, you can check Brighton weather in May.

In comparing the weather between September and June, both months exhibit mild temperatures, but with slight variations. September has a minimum temperature of 10°C (50°F) and peaks around 22°C (72°F), averaging 16°C (62°F), while June's temperature ranges from a low of 10°C (51°F) to a high of 21°C (70°F), averaging 15°C (59°F). Precipitation levels are fairly similar, with September receiving 63 mm (2.5 in) over 11 days, and June slightly ahead with 65 mm (2.6 in) across 9 days. Humidity remains fairly consistent as well, with September at 82% and June at 80%. For more detailed insights on June weather, you can check out Brighton weather in June.

When comparing the weather in September and July, a few notable differences emerge. September typically features cooler temperatures, with a minimum of 10°C (50°F) and an average of 16°C (62°F), while July boasts slightly warmer conditions, with a minimum of 13°C (56°F) and an average of 17°C (63°F). Additionally, September experiences higher humidity levels at 82%, compared to July's 71%. In terms of precipitation, September receives more rainfall with 63 mm (2.5 in) over 11 days, whereas July has 52 mm (2.0 in) over 9 days. For more specific details on July weather, you can visit Brighton weather in July.

In comparing the weather between August and September, we see a noticeable shift in temperature and precipitation. August typically enjoys slightly warmer days, with average highs reaching 24°C (76°F) compared to September's peak of 22°C (72°F). In terms of humidity, September is notably more humid at 82%, while August sits at 76%. Precipitation also increases from August to September, with September experiencing 63 mm (2.5 in) over 11 days, while August sees 74 mm (2.9 in) across 13 days. For more detailed insights into August weather specifically, check out Brighton weather in August.

September generally features mild temperatures, with average highs around 22°C (72°F) and lows of 10°C (50°F). The month receives about 63 mm (2.5 in) of rain over 11 days, accompanied by a relative humidity of 82%. In contrast, October sees a slight dip in temperatures, with averages around 14°C (58°F) and maximums reaching 20°C (68°F). However, it experiences increased precipitation, totaling 129 mm (5.1 in) over 16 days, and higher humidity at 90%. This shift highlights a transition into a wetter and cooler climate as autumn progresses. For more details on October weather specifically in Brighton, visit Brighton weather in October.

In September, the weather is generally milder, with average temperatures ranging from a minimum of 10°C (50°F) to a maximum of 22°C (72°F), and an overall average of 16°C (62°F). The month experiences relatively less precipitation, with 63 mm (2.5 in) falling over about 11 days and a humidity level of 82%.

In contrast, November brings cooler temperatures, with averages dropping to a maximum of 16°C (61°F) and a minimum of just 3°C (37°F), resulting in an average temperature of only 11°C (52°F). The precipitation increases significantly to 110 mm (4.3 in) over 16 days, coupled with heightened humidity at 92%. For more detailed information, check Brighton weather in November.

Overall, September offers a more pleasant climate, while November shifts towards colder and wetter conditions.

September and December present contrasting weather patterns. In September, temperatures range from a minimum of 10°C (50°F) to a pleasant average of 16°C (62°F), with maximums reaching 22°C (72°F). The month experiences relatively moderate precipitation, totaling 63 mm (2.5 in) over about 11 days, alongside a humidity level of 82%. In contrast, December sees a significant drop in temperatures, with a minimum of 2°C (35°F) and an average of only 9°C (48°F), peaking at 13°C (56°F). The winter month also brings increased precipitation, reaching 138 mm (5.4 in) spread over 18 days, accompanied by even higher humidity at 92%. For more detailed information, check out Brighton weather in December.

Compare Brighton's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Brighton

As September transitions into autumn, Brighton's weather showcases a delightful shift from the summer warmth. With milder average temperatures, the air feels crisper, making it a refreshing time to explore the seaside. However, this month also brings increased rainfall compared to the drier summer months, with several days of precipitation that enhance the vibrant colors of the changing foliage. The higher humidity levels add a touch of warmth to the cooler breezes, making September a unique blend of summer's remnants and autumn's embrace. For a deeper understanding of Brighton's weather patterns throughout the year, check out Brighton Climate.