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United StatesThe weather in August in Alton
It's hot in August in Alton with an average temperature of 30°C. Temperatures this month range from a low of 29°C to a high of 32°C. At night, you can expect temperatures between 19°C and 22°C.
Looking for sun? August isn’t a good month to be in Alton. 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 August for Alton, Illinois. 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 39°C in 2023, Alton reached the highest temperature in August over the past 10 years. The lowest daytime temperature in this month was 22°C in 2019. The extreme nighttime temperatures ranged from a lowest recorded value of 12°C to a highest value of 27°C.
Rainfall amount
In August, there is an average of 163 mm of precipitation, spread over 17 days. The wind speed is around 3 Bft, mostly coming from the South.
Daily weather in August for Alton
Click on any day in August to get detailed info about the usual weather on that day in Alton. Check out the historical temperatures and precipitation over the past 10 years on this day.
August weather comparison
| Alton | New York | |
|---|---|---|
| Average temperature | 30°C | 30°C |
| Max. temperature | 32°C | 31°C |
| Min. temperature | 19°C | -5°C |
| Total precipitation | 163 mm | 79 mm |
| Rainy days | 17 days | 13 days |
Start of August
The month of August starts in Alton with hot temps, averaging around 31°C during the day and nights around 21°C.
Mid August
By mid-August, daytime temps drop to around 30°C, with nights around 20°C. During this part of the month, you might see regular precipitation, but there will also be some sunny days.
End of August
By the end of August, the average daytime temperature in Alton is around 31°C, while nighttime temps are about 20°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 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.
Check out the climate of Alton for all months and discover the best travel time
Temperature charts
These charts show the average temperatures in August in Alton, Illinois. The temperatures are shown in degrees Celsius and are calculated based on data from the past 10 years.
Daily Temperature in August in Alton
Temperature in August in Alton over the years
Precipitation charts
These charts show the average amount of precipitation in August in Alton, Illinois. 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 August in Alton
Total precipitation in August in Alton over the years
Daily UV index in August in Alton
This chart shows the average daily UV index in August in Alton, 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 August in Alton
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Average weather in Alton by month
Click on a month below to see detailed weather info for Alton. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.