Cruz Bay Weather in September
What's the weather like in Cruz Bay (Saint John Island) in September 2025?
The climate in Cruz Bay during September can be summarized as hot, humid and wet.
September is in the fall / autumn in Cruz Bay and is typically the 2nd warmest month of the year. Daytime maximum temperatures average around a steamy 31°C (87°F), whilst at night 24°C (75°F) is normal.
| Daytime temperature | 30.6°C 87.1°F |
|---|---|
| Nightly temperature | 24°C 75.2°F |
| Average temperature | 27.3°C 81.1°F |
| Daily sunshine | 8.2 hrs |
| Avg rainfall | 143 mm 5.6 ins |
| Rainy days | 19 days |
| Sea temperature | 28.9°C 84.1°F |
| Humidity | 77% |
| Windspeed | 16.2kph 10 mph |
On average September is the 3rd wettest month of the year in Cruz Bay with around 143mm 5.6 inches of rain making it a wet time to visit. This rainfall is typically spread over 19 days, although this may vary considerably.
On the flip side this corresponds to an average of 8.2 hours of sunshine per day.
September temperatures in Cruz Bay
September rainfall
September hourly sunshine
The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Cruz Bay in September 2025.
Other monthly averages
Best places to visit in September
Cruz Bay weather stats
| Hottest month: | August | 30.4°C 86.7°F |
|---|---|---|
| Driest month: | February | 54mm 2.1ins |
| Sunniest month: | March | 9.3hrs |
| Coldest month: | January | 27.5°C 81.5°F |
| Wettest month: | October | 161mm 6.3ins |
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