Temperatures in September
It's warm in September in Jefferson with an average temperature of 23°C. Temperatures this month range from a low of 16°C to a high of 28°C. At night, you can expect temperatures between 10°C and 17°C.
Max and Min Temperatures per Day
This chart shows the daily maximum and minimum temperatures in degrees Celsius for Jefferson in September. The red line indicates the max temperatures, and the blue line shows the minimums.
Start of September
The month of September starts in Jefferson with warm temperatures, averaging around 25°C during the day and nights close to 15°C. You can expect regular precipitation, but there’s also a chance for some sunny days in the first days of the month.
Mid-September
By mid-September, the average daytime temperature stays the same at 25°C, with nights close to 14°C. During this part of the month, you can expect regular precipitation, but there’ll also be some sunny days.
End of September
By the end of September, the average daytime temperature in Jefferson will be around 22°C, with nights close to 12°C. A shower might show up, but overall the weather will be dry and sunny.
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Precipitation in September
In September, there is an average of 138 mm of precipitation, spread over 8 days. The wind speed is around 3 Bft, mostly coming from the Southwest.
The average precipitation chance is 28% per day this month. Though it seems pretty low, the weather’s variable. Some days have higher and others lower precipitation chances, which lowers the average.
Precipitation Chance
This chart shows the daily precipitation chance (in percentages) in September for Jefferson. 0% means it never rained on that day in the past 10 years, and 100% means it rained every day. All values in between represent the average chance of precipitation on that day.
Jefferson in September |
London | ||
|---|---|---|---|
 Average Temperature |
23°C | 20°C | |
 High Temp |
28°C | 22°C | |
| Low Temp |
16°C | 17°C | |
 Total Precipitation |
138 mm | 44 mm | |
| Rainy Days |
8 days | 8 days | |
August
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.
Is September a good time to visit Jefferson?
After some sun? Then September isn’t the best time to be in Jefferson. The temperature is pleasant, but there’s too much chance of rain this month.
Temperature records for Jefferson in September
With 34°C, Jefferson hit the highest temperature in the last 10 years in September 2023. The lowest daytime temperature in this month was 13°C in 2018. The extreme night temperatures ranged from a low of 1°C to a high of 23°C.
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Daily Temperature in September in Jefferson
This chart shows the average daily temperatures, both day and night, for each day in September in Jefferson, measured in degrees Celsius. The red line represents the maximum temperatures, while the blue line shows the minimums. The days of the month are displayed at the bottom of the chart. The data, based on historical observations, gives an overview of the average daily temperatures during this month.
Daily Precipitation in September in Jefferson
The chart below shows the average daily precipitation in September for Jefferson, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail. The days of the month are shown 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 rain is more likely. But it’s still an average, so each day can be different. Based on historical weather data for September, you can expect around 8 days of rain in Jefferson.
Daily UV Index in September in Jefferson
This chart shows the average daily UV index in September in Jefferson, 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 Jefferson Over the Years
This chart shows the average temperature in September in Jefferson, measured in degrees Celsius, over the past years.
Total Precipitation in September in Jefferson Over the Years
This chart shows the average precipitation in September in Jefferson, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail.
Daily climate in September for Jefferson
Click on a specific day in September for detailed info on the typical weather on that day in Jefferson. Check out the historical temperatures and precipitation over the past 10 years on this day.
Weather experiences in September in Jefferson
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Average Weather in Jefferson by Month
Click on a month below to see detailed weather info for Jefferson. 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 Jefferson for all months at once
