Weathermondo.com
JerseyThe weather in September in Saint Helier
It's pleasantly warm in September in Saint Helier with an average temperature of 20°C. Temperatures this month range from a low of 18°C to a high of 22°C. At night, you can expect temperatures between 13°C and 16°C.
Looking for great weather? September is a good time to be in Saint Helier. 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 Helier, Jersey. 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 31°C in 2020, Saint Helier reached the highest temperature in September over the past 10 years. The lowest daytime temperature in this month was 14°C in 2020. The extreme nighttime temperatures ranged from a lowest recorded value of 6°C to a highest value of 20°C.
Water temperature
The water temperature at Saint Helier is 19°C this month. Refreshing if you feel like a swim.
Rainfall amount
In September, there is an average of 47 mm of precipitation, spread over 9 days. The wind speed is around 4 Bft, mostly coming from the South.
Daily weather in September for Saint Helier
Click on any day in September to get detailed info about the usual weather on that day in Saint Helier. Check out the historical temperatures and precipitation over the past 10 years on this day.
September weather comparison
| Saint Helier | New York | |
|---|---|---|
| Average temperature | 20°C | 27°C |
| Max. temperature | 22°C | 31°C |
| Min. temperature | 13°C | -5°C |
| Total precipitation | 47 mm | 57 mm |
| Rainy days | 9 days | 9 days |
Start of September
The month of September starts in Saint Helier with mild temps, averaging around 21°C during the day and nights around 16°C.
Mid September
By mid-September, daytime temps stay steady at around 21°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 Helier is around 19°C, while nighttime temps are about 14°C. A shower might pop up, but overall, the weather will be dry and sunny.
UV index
The UV index is a maximum of 7 this month. That's a moderate to high value on the intensity scale of 1 to 11. Unprotected skin can burn within 15-25 minutes.
Check out the climate of Saint Helier for all months and discover the best travel time
Temperature charts
These charts show the average temperatures in September in Saint Helier, Jersey. The temperatures are shown in degrees Celsius and are calculated based on data from the past 10 years.
Daily Temperature in September in Saint Helier
Temperature in September in Saint Helier over the years
Precipitation charts
These charts show the average amount of precipitation in September in Saint Helier, Jersey. 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 Helier
Total precipitation in September in Saint Helier over the years
Daily UV index in September in Saint Helier
This chart shows the average daily UV index in September in Saint Helier, 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 Helier
Have you been to Saint Helier in September?
Share your weather experience in September in Saint Helier.
Average weather in Saint Helier by month
Click on a month below to see detailed weather info for Saint Helier. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.