St John's weather in September 2025

Expect 31°C daytime maximum temperatures in the shade with on average 7 hours of sunshine per day in St John's in September. Check more long-term weather averages for St John's in September before you book your next holiday to Antigua in 2025/2026.

  • 31°C maximum daytime temperature in September in St John's31
    31°C max day temperature
  • 7 hours of sunshine per day
  • 17 days with some rainfall in September in St John's17
    17 days with some rainfall
  • 25°C minimum night-time temperature in September in St John's25
    25°C min night temperature
  • 12 hours of daylight per day in September in St John's12
    12 hours of daylight per day
  • Very high heat & humidity in September in St John'sVH
    Very High heat & humidity
  • 140 mm monthly rainfall in September in St John's140
    140 mm of monthly rainfall
  • UV (maximum) index 11+ (Extreme) in September in St John's11
    11+ (Extreme) UV index
  • 29°C sea temperature in September in St John's29
    29°C sea temperature

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The September weather guide for Antigua (St John's) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C / mm)  |  Imperial (°F / inches)

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More about Antigua

How hot is it in St John's in September?

Daytime temperatures usually reach 31°C in St John's in September with very high heat and humidity, falling to 25°C at night.

How sunny is it in St John's in September?

There are normally 7 hours of bright sunshine each day in St John's in September - that's 61% of daylight hours.

How warm is the sea around St John's in September?

The average sea temperature around St John's in September is 29°C.

Does it rain in St John's in September?

There are usually 17 days with some rain in St John's in September and the average monthly rainfall is 140mm.

What is the chance of a hurricane in St John's in September?

On average 1.3 days in September in St John's are likely to be affected by the passage of one or more tropical storms.

St John's September sunrise & sunset times

Browse the sunrise and sunset times for St John's in September 2025. Select a month to view St John's sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:54 18:21
Monday, 15th September 2025 05:56 18:09
Tuesday, 30th September 2025 05:57 17:57

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