Brighton weather in September

September in Brighton: nice, a little rain, with clean air — a great time to visit.

Updated September 2026 · climate normals from ERA5 reanalysis

Brighton🇬🇧 United Kingdom · British Isles · Beach75
  1. 40Jan
  2. 47Feb
  3. 57Mar
  4. 73Apr
  5. 77May
  6. 81Jun
  7. 84Jul
  8. 86Aug
  9. 75Sep
  10. 62Oct
  11. 49Nov
  12. 38Dec

#5 of 12 months in Brighton · #842 of 1413 destinations to visit in September · comfort 75/100 (tier B)

Days
20°C
Nights
11°C
Wet days
11
Sun
8.5 h
Humidity
79%
Daylight
13 h
Brighton, United Kingdom
Photo: Expect Best · Pexels

Traveller notes on Brighton in September

Notes from nearby London (76 km away)

Brighton doesn't have its own notes for September yet — these are about London, close enough to share the season.

Regulars are candid that recent early-September stretches have run warm and sunny, but are careful to add that's no guarantee for any given year - the month can just as easily turn wet, windy and chilly. Our row backs the moderate average sitting between those extremes, 20.7C over 12.3C nights, with 56.2mm of rain across 10.6 days. Regulars picked this month specifically expecting lighter crowds than July or August alongside reasonably decent weather, and are consistent that layering plus an umbrella and cardigan for cooler evenings is the standard advice regardless of how the daytime weather turns out. The record: humidity 78 percent, 7.8 hours of sun, a 19 kph wind and AQI 46.
PastYearsWarmDoesNotGuaranteeThisOne · September · 1 month ago · about London · Read more on Tripadvisor ↗

Other months in Brighton

The Brighton forum's line on July is that it is unpredictable in both directions - brilliant one week, grey and wet the next - with the south coast running warmer than points north. The beach is pebble, not sand, and regulars warn that the water is cold whatever the air is doing, though people swim anyway; Hove Lawns is the recommendation for a proper swim, with a blue flag, a lifeguard, a cafe and toilets on the promenade. On crowds the advice is blunt: if it is sunny, every beach in Brighton and Hove will be busy, the stretch between the two piers busiest of all, quieter east and west, and a weekday better than a weekend. The record: 21.6C days, 13C nights, 9.8 precipitation days, 11.5 hours of sun and a 17.8C sea.
PebblesAndPromenade · July · 1 month ago · Read more on Tripadvisor ↗
Forum posters are candid that February is cold, often not much above freezing, and dark early - but a surprising number argue winter is actually the best time to visit precisely because the summer crowds are long gone while the city itself stays fully open. The advice for rainy stretches is simply not to let it derail the trip: the museum, the Pavilion, the pier and Churchill Square all give plenty of indoor and covered options, and a rainy day arguably means a quieter, more local experience of the seafront and lanes.
Tripadvisor community · February · 1 month ago · Read more on Tripadvisor ↗
Brighton's forum is honest that August is no sure thing — regulars describe swings from a cool, rainy week in the mid-60s°F to a properly hot one in the high 80s within the same summer. The one constant: it's a pebble beach, not sand, and the water stays cold enough that most visitors manage no more than a quick dip even in August.
Tripadvisor community · August · 1 month ago · Read more on Tripadvisor ↗

Add your own note from Brighton's card on the map.

Brighton climate normals — September

Daytime high20°C / 67°F😎 nice
Nighttime low11°C / 51°F
Feels like (high)18°C / 64°F
Sea temperature19°C / 67°F🌊 fresh
Rainfall64 mm / 2.5 in🌦 some rain
Rainy days11 days
Humidity79%💦 very humid
Dew point12°C / 54°F
Sunshine8.5 h/day
Daylight12.6 h
Wind21 km/h / 13 mph
Air quality (US AQI)45🍃 good

Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.

Crowds in Brighton in September

How busy the place itself is — school and mass holidays, the months an editor tagged, and how sought-after the weather makes them. Never part of the comfort score.

Peak crowdsBeach season, London day-trippers, school holidays in 3 of the markets that fill it(estimated)

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Peak crowdsBusyShoulder seasonQuiet

Best months for Brighton's weather

Ranked by this destination's own climate comfort score across the year — a different thing from how busy it gets (see Crowds above).

Fair weatherBrighton's weather peaks June–August.

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Best weatherFair weatherToughest weather

What's on in Brighton in September

Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.

  • Season

    Beach season

    1 Jun – 15 Sep · usuallySea warm enoughCrowded

    Day trippers from London fill the pebbles on any warm weekend and the trains down are rationed by capacity rather than timetable. The sea is swimmable but never warm.

  • Season

    London day-trippers

    20 Jun – 5 Sep · usuallyDay-tripper crushCrowded

    An hour from Victoria and the beach fills on any warm weekend; the last trains back go standing and the Lanes are shoulder to shoulder from noon. Weekday mornings are another city. Source ↗

What's on around the world in September →

Nearby, and something's on

Within 300 km of Brighton — a day trip or a short hop — with something on this month. Never part of the comfort score.

Where is Brighton?

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Brighton in September — FAQ

Is September a good time to visit Brighton?
September in Brighton: nice, a little rain, with clean air — a great time to visit. It ranks #5 of 12 months for Brighton on SeasonMap's comfort score (75/100).
What is the weather like in Brighton in September?
In September, Brighton averages a daily high of 19.5°C and a low of 10.7°C, with about 64.2 mm of rain over roughly 10.8 rainy days.
What is the air quality in Brighton in September?
Brighton has a mean US Air Quality Index of about 45 in September.

Within 300 km: London's Open House Festival on 12–20 Sep, and Bournemouth's New Forest heather around 1 Aug – 10 Sep.