Normal weather for St Mary's in September
It's cool to moderate in September in St Mary's with an average temperature of 18°C. Temperatures this month range from a low of 17°C to a high of 20°C. At night, you can expect temperatures between 13°C and 15°C.
In September, there is an average of 57 mm of precipitation, spread over 9 days. The wind speed is around 5 Bft, mostly coming from the South.
St Mary's in September |
New York | ||
|---|---|---|---|
 Average Temperature |
18°C | 27°C | |
 High Temp |
20°C | 31°C | |
| Low Temp |
17°C | 21°C | |
 Total Precipitation |
57 mm | 57 mm | |
| Rainy Days |
9 days | 9 days | |
Start of September
The month of September starts in St Mary's with mild temps, averaging around 20°C during the day and nights around 15°C. A few showers might pop up early in the month, but overall, it’ll stay mostly sunny and dry.
With the temperature difference between day and night, it’s smart to wear layers. During the day, a shirt, maybe a light sweater, and thin pants will do. In the evening and morning, choose a light jacket, sweater or hoodie, and long pants.
Mid September
By mid-September, daytime temps drop to 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.
Since it cools down at night, it’s a good idea to wear layers. During the day, a shirt, maybe a light sweater, and thin pants will do. In the evening and morning, choose a light jacket, sweater or hoodie, and long pants.
End of September
By the end of September, the average daytime temperature in St Mary's is around 18°C, while nighttime temps are about 14°C. A shower might pop up, but overall, the weather will be dry and sunny.
Because temperatures drop in the evening, wearing layers is recommended. During the day, a shirt, maybe a light sweater, and thin pants will do. In the evening and morning, choose a light jacket, sweater or hoodie, and long pants.
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.
Is September a good time to visit St Mary's?
Looking for great weather? September is a good time to be in St Mary's. The temperatures are nice, and there’s not too much rain.
Temperature records for St Mary's in September
Check out the climate of St Mary's for all months and discover the best travel time
August
Daily Temperature in September in St Mary's
This chart shows the average daily high and low temperatures in September for St Mary's, in degrees Celsius. The red line represents the highs, and the blue line shows the lows. The days of the month are displayed at the bottom of the chart. The data, based on historical observations, provide the average temperatures for this month.
Daily Precipitation in September in St Mary's
The chart below shows the average daily precipitation in September for St Mary's, measured in millimeters over the past few years. Precipitation is always measured as water, even if it’s snow or hail. The days of the month are listed at the bottom of the chart.
A low average precipitation means that the chance of rain on that day is usually small, while a higher average suggests that it rained more often. But remember, it’s just an average, and every day can be different. Based on historical weather data for September, you can expect about 9 days of precipitation in St Mary's.
Daily UV Index in September in St Mary's
This chart shows the average daily UV index in September in St Mary's, 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.
Temperature in September in St Mary's Over the Years
This chart shows the average temperature in September in St Mary's, measured in degrees Celsius, over the past few years.
Total Precipitation in September in St Mary's Over the Years
This chart shows the average precipitation in September in St Mary's, measured in millimeters over the past years. Precipitation is always measured as water, whether it’s snow or hail.
Daily Climate in September for St Mary's
Click on any day in September to get detailed info about the usual weather on that day in St Mary's. Check out the historical temperatures and precipitation over the past 10 years on this day.
Weather experiences in September in St Mary's
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Average Weather in St Mary's by Month
Click on a month below to see detailed weather info for St Mary's. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.
Or check out the climate of St Mary's for all months at once
