Weathermondo.com
United StatesThe weather in September in Saint Peters
It's warm in September in Saint Peters with an average temperature of 25°C. Temperatures this month range from a low of 20°C to a high of 29°C. At night, you can expect temperatures between 12°C and 18°C.
Looking for sun? September isn’t a good month to be in Saint Peters. The temperature is nice, but there’s too much chance of 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 Peters, Pennsylvania. 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 35°C in 2016, Saint Peters reached the highest temperature in September over the past 10 years. The lowest daytime temperature in this month was 14°C in 2018. The extreme nighttime temperatures ranged from a lowest recorded value of 2°C to a highest value of 24°C.
Rainfall amount
In September, there is an average of 204 mm of precipitation, spread over 19 days. The wind speed is around 3 Bft, mostly coming from the South.
Daily weather in September for Saint Peters
Click on any day in September to get detailed info about the usual weather on that day in Saint Peters. Check out the historical temperatures and precipitation over the past 10 years on this day.
September weather comparison
| Saint Peters | New York | |
|---|---|---|
| Average temperature | 25°C | 27°C |
| Max. temperature | 29°C | 31°C |
| Min. temperature | 12°C | -5°C |
| Total precipitation | 204 mm | 57 mm |
| Rainy days | 19 days | 9 days |
Start of September
The month of September starts in Saint Peters with hot temps, averaging around 27°C during the day and nights around 18°C.
Mid September
By mid-September, daytime temps drop to around 25°C, with nights around 15°C. During this part of the month, you might see regular precipitation, but there will also be some sunny days.
End of September
By the end of September, the average daytime temperature in Saint Peters is around 24°C, while nighttime temps are about 14°C. Expect regular precipitation, but if you’re lucky, you’ll also get some dry and sunny days.
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UV index
The UV index is a maximum of 8 this month. That's a very high value on the intensity scale of 1 to 11. Unprotected skin can burn within 10-15 minutes.
Check out the climate of Saint Peters for all months and discover the best travel time
Temperature charts
These charts show the average temperatures in September in Saint Peters, Pennsylvania. The temperatures are shown in degrees Celsius and are calculated based on data from the past 10 years.
Daily Temperature in September in Saint Peters
Temperature in September in Saint Peters over the years
Precipitation charts
These charts show the average amount of precipitation in September in Saint Peters, Pennsylvania. 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 Peters
Total precipitation in September in Saint Peters over the years
Daily UV index in September in Saint Peters
This chart shows the average daily UV index in September in Saint Peters, 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 Peters
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Average weather in Saint Peters by month
Click on a month below to see detailed weather info for Saint Peters. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.