IrelandThe weather in September in Saint Johns Port
It's cool to moderate in September in Saint Johns Port with an average temperature of 17°C. Temperatures this month range from a low of 15°C to a high of 19°C. At night, you can expect temperatures between 9°C and 13°C.
Looking for sun and warm weather? September isn’t a good month to be in Saint Johns Port. The temperatures are too low for a warm stay this month.
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 Johns Port, Ireland. 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 2021, Saint Johns Port reached the highest temperature in September over the past 10 years. The lowest daytime temperature in this month was 11°C in 2019. The extreme nighttime temperatures ranged from a lowest recorded value of 2°C to a highest value of 17°C.
Rainfall amount
In September, there is an average of 76 mm of precipitation, spread over 10 days. The wind speed is around 4 Bft, mostly coming from the Southwest.
Daily weather in September for Saint Johns Port
Click on any day in September to get detailed info about the usual weather on that day in Saint Johns Port. Check out the historical temperatures and precipitation over the past 10 years on this day.
September weather comparison
| Saint Johns Port | New York | |
|---|---|---|
| Average temperature | 17°C | 27°C |
| Max. temperature | 19°C | 31°C |
| Min. temperature | 9°C | -5°C |
| Total precipitation | 76 mm | 57 mm |
| Rainy days | 10 days | 9 days |
Start of September
The month of September starts in Saint Johns Port with mild temps, averaging around 18°C during the day and nights around 12°C.
Mid September
By mid-September, daytime temps drop to around 17°C, with nights around 11°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 Johns Port is around 16°C, while nighttime temps are about 10°C. A shower might pop up, but overall, the weather will be dry and sunny.
UV index
The UV index is a maximum of 4 this month. That's a moderate value on the intensity scale of 1 to 11. Unprotected skin can burn in about 30 minutes.
Check out the climate of Saint Johns Port for all months and discover the best travel time
Temperature charts
These charts show the average temperatures in September in Saint Johns Port, Ireland. The temperatures are shown in degrees Celsius and are calculated based on data from the past 10 years.
Daily Temperature in September in Saint Johns Port
Temperature in September in Saint Johns Port over the years
Precipitation charts
These charts show the average amount of precipitation in September in Saint Johns Port, Ireland. 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 Johns Port
Total precipitation in September in Saint Johns Port over the years
Daily UV index in September in Saint Johns Port
This chart shows the average daily UV index in September in Saint Johns Port, 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 Johns Port
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Average weather in Saint Johns Port by month
Click on a month below to see detailed weather info for Saint Johns Port. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.