The weather in September in Saint Helena, Ascension and Tristan da Cunha
It's pleasantly warm in September in Saint Helena, Ascension and Tristan da Cunha with an average temperature of 19°C. Temperatures this month range from a low of 18°C to a high of 20°C. At night, you can expect temperatures between 15°C and 16°C.
Looking for great weather? September is a good time to be in Saint Helena, Ascension and Tristan da Cunha. The temperatures are nice, and there’s not too much rain.
Average temperatures and precipitation
This chart shows the average daily maximum and minimum temperatures (in degrees Celsius) and precipitation (in millimeters) in September for Saint Helena, Ascension and Tristan da Cunha. A low precipitation value usually indicates little to no rainfall on that day in recent years, while a higher value suggests more frequent rainfall.
Temperature records
With 29°C in 2022, Saint Helena, Ascension and Tristan da Cunha reached the highest temperature in September over the past 10 years. The lowest daytime temperature in this month was 15°C in 2020. The extreme nighttime temperatures ranged from a lowest recorded value of 12°C to a highest value of 19°C.
Rainfall amount
In September, there is an average of 34 mm of precipitation, spread over 8 days. The wind speed is around 5 Bft, mostly coming from the Southeast.
Daily weather in September for Saint Helena, Ascension and Tristan da Cunha
Click on any day in September to get detailed info about the usual weather on that day in Saint Helena, Ascension and Tristan da Cunha. Check out the historical temperatures and precipitation over the past 10 years on this day.
September weather comparison
| Saint Helena, Ascension and Tristan da Cunha | New York | |
|---|---|---|
| Average temperature | 19°C | 27°C |
| Max. temperature | 20°C | 31°C |
| Min. temperature | 15°C | -5°C |
| Total precipitation | 34 mm | 57 mm |
| Rainy days | 8 days | 9 days |
Start of September
The month of September starts in Saint Helena, Ascension and Tristan da Cunha with mild temps, averaging around 19°C during the day and nights around 16°C.
Mid September
By mid-September, daytime temps stay steady at around 19°C, with nights around 15°C. There’s a chance of some showers during this time, but plenty of dry and sunny days too.
End of September
By the end of September, the average daytime temperature in Saint Helena, Ascension and Tristan da Cunha is around 19°C, while nighttime temps are about 15°C. A shower might pop up, but overall, the weather will be dry and sunny.
UV index
The UV index is a maximum of 9 this month. That's a very high value on the intensity scale of 1 to 11. Unprotected skin can burn within 10-15 minutes.
You can check out all destinations in Saint Helena, Ascension and Tristan da Cunha to get the full picture of the climate.
Temperature charts
These charts show the average temperatures in September in Saint Helena, Ascension and Tristan da Cunha. The temperatures are shown in degrees Celsius and are calculated based on data from the past 10 years.
Daily Temperature in September in Saint Helena, Ascension and Tristan da Cunha
Temperature in September in Saint Helena, Ascension and Tristan da Cunha over the years
Precipitation charts
These charts show the average amount of precipitation in September in Saint Helena, Ascension and Tristan da Cunha. Precipitation is always measured as water, even when it falls as snow or hail The amount of precipitation is displayed in millimeters, while snowfall is shown in centimeters.
Daily Precipitation in September in Saint Helena, Ascension and Tristan da Cunha
Total precipitation in September in Saint Helena, Ascension and Tristan da Cunha over the years
Daily UV index in September in Saint Helena, Ascension and Tristan da Cunha
This chart shows the average daily UV index in September in Saint Helena, Ascension and Tristan da Cunha, with the UV index ranging from 0 to a maximum of 11. The bottom of the chart shows the days of the month. Based on historical data, this chart provides an idea of the daily UV radiation levels you can expect.
Weather experiences in September in Saint Helena, Ascension and Tristan da Cunha
Have you been to Saint Helena, Ascension and Tristan da Cunha in September?
Share your weather experience in September in Saint Helena, Ascension and Tristan da Cunha.
Average weather in Saint Helena, Ascension and Tristan da Cunha by month
Click on a month below to see detailed weather info for Saint Helena, Ascension and Tristan da Cunha. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.