St John's weather in September 2025

Q: 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.

Q: 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.

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

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

Q: 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.

Q: What is the chance of a cyclone 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.

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
31°C max day temperature
7
7 hours of sunshine per day
17
17 days with some rainfall
25
25°C min night temperature
12
12 hours of daylight per day
VH
Very High heat & humidity
140
140 mm of monthly rainfall
11
11+ (Extreme) UV index
29
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)

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.

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

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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Antigua - quick facts
Flight time^✝	9 hours
Time difference	UK -4 hours
Language(s)	English
Currency	Eastern Caribbean Dollar
Electricity	A + B plug (230V)
Driving side	Left
Why visit?	Beaches Nature Nightlife
Tourist info	Antigua Barbuda Tourism Authority