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United StatesThe weather in September in Casper
It's warm in September in Casper with an average temperature of 25°C. Temperatures this month range from a low of 20°C to a high of 31°C. At night, you can expect temperatures between 4°C and 12°C.
Looking for great weather? September is a good time to be in Casper. 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 Casper, Wyoming. A low precipitation value usually indicates little to no rainfall on that day in recent years, while a higher value suggests more frequent rainfall.
Precipitation and snowfall
In September, there is an average of 21 mm of precipitation, spread over 5 days. Of the total precipitation, about 1,1 cm falls as snow in September. The wind speed is around 5 Bft, mostly coming from the South.
Daily weather in September for Casper
Click on any day in September to get detailed info about the usual weather on that day in Casper. Check out the historical temperatures and precipitation over the past 10 years on this day.
September weather comparison
| Casper | New York | |
|---|---|---|
| Average temperature | 25°C | 27°C |
| Max. temperature | 31°C | 31°C |
| Min. temperature | 4°C | -5°C |
| Total precipitation | 21 mm | 57 mm |
| Rainy days | 5 days | 9 days |
| Total snowfall | 1,1 cm | 0 cm |
| Snowy days | 1 day | 0 days |
Start of September
The month of September starts in Casper with hot temps, averaging around 28°C during the day and nights around 10°C.
Mid September
By mid-September, daytime temps drop to around 26°C, with nights around 8°C. Not much precipitation expected during this period. It’s mostly dry and sunny.
End of September
By the end of September, the average daytime temperature in Casper is around 23°C, while nighttime temps are about 6°C. There’s hardly any chance of precipitation. The weather will be mostly dry with plenty of sun.
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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 Casper for all months and discover the best travel time
Temperature charts
These charts show the average temperatures in September in Casper, Wyoming. The temperatures are shown in degrees Celsius and are calculated based on data from the past 10 years.
Daily Temperature in September in Casper
Temperature in September in Casper over the years
Precipitation charts
These charts show the average amount of precipitation in September in Casper, Wyoming. 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 Casper
Total precipitation in September in Casper over the years
Daily Snowfall in September in Casper
Snowfall in September in Casper per year
Daily UV index in September in Casper
This chart shows the average daily UV index in September in Casper, 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 Casper
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Average weather in Casper by month
Click on a month below to see detailed weather info for Casper. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.