Weather in Alton, United States
Weather Advisories
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Today's weather summary
The weather in Alton on Saturday, July 25th, is going to be mostly clear for most of the day, together with cloud overcast before dawn.
There is also a chance for some clouds during the morning around 10 am.
Weather details for Alton, on Saturday, July 25th:
The highest temperature during the day is going to be 28°C around 7 pm. The day will be extremely humid, with average humidity of 77%, ranging from 55% to a maximum value of 95% at about 7 am. The wind will be light, and will get up to 14 km/h at 11 am, blowing from the west. The cloud coverage will range from 11% around 2 pm to as high as 100% around 11 pm with an average of 57%.
The precipitation probability will change throughout the day between 0% and 20%. The highest chance for precipitation will be around 10 pm and the lowest probability around midnight. The dew point will range from 16°C up to a maximum value of 21°C around 11 pm.
The visibility is expected to be good with average visibility of 15 km throughout the day. Atmospheric pressure will be normal with average pressure of 1017 hPa. Sunrise will be at 6:36 am, and sunset at 8:55 pm, making it a total of 14 hours and 19 minutes of daylight.
Air quality forecast for Alton, on Saturday, July 25th:
On average, the air quality on this day will be moderate, meaning that air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. According to our index, ranging from 0 to 500, the air quality is going to be between values of 41 and 68.
Pollen forecast for Alton, on Saturday, July 25th:
The overall pollen forecast for this day shows no significant pollen. Tree pollen on this day is expected to have no risk. There's no risk of weed pollen, and as for grass pollen, this day is expected to have no risk.
The weather in Alton on Sunday, July 26th, will be cloudy for most of the day, together with clear skies before dawn.
There's seems to be also high probability of some clouds before dawn around 1 am.
Weather information for Alton, on Sunday, July 26th:
The highest temperature of the day is going to be 31°C at about 4 pm. The day will be extremely humid, with average humidity of 82%, ranging from 57% to a maximum value of 100% at about 9 am. The wind will be light, and will get up to 13 km/h at 6 pm, blowing from the west. The cloud coverage will range from 0% around 8 pm to as high as 100% around 10 pm with an average of 65%.
The precipitation probability will change throughout the day between 0% and 20%. The highest chance for precipitation will be around midnight and the lowest probability around 1 am. The dew point will range from 21°C up to a maximum value of 23°C around 8 pm.
The visibility is expected to be good with average visibility of 12 km throughout the day. Atmospheric pressure will be normal with average pressure of 1013 hPa. Sunrise will be at 6:37 am, and sunset at 8:54 pm. The day will have 14 hours and 17 minutes of daylight.
Air quality forecast for Alton, on Sunday, July 26th:
On average, the air quality on this day will be moderate, meaning that air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. According to our index, ranging from 0 to 500, the air quality is going to be between values of 53 and 61.
Pollen forecast for Alton, on Sunday, July 26th:
The overall pollen forecast for this day shows no significant pollen. Tree pollen on this day is expected to have no risk. There's no risk of weed pollen, and as for grass pollen, this day is expected to have no risk.
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