Lat: 38.90N, Lon: 90.15W
Wx Zone: ILZ100 
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Current Conditions

°F Click to change Alton weather to Imperial units.Click to change Alton weather to Metric units. °C
Clear
Clear
64°F
Updated: 09/28 7:53 am
Feels Like:
64°F
Humidity: 83%
Wind:
N 5 mph
Barometer:
29.94 in
Visibility:
10 mi
Clear
Clear
18°C
Updated: 09/28 7:53 am
Feels Like:
18°C
Humidity: 83%
Wind:
N 8 km/h
Barometer:
1014 mb
Visibility:
16 km

Sun & Moon

Cloud Cover: 0%
UV Index: 6
Sunrise: 06:54 AM
Sunset: 06:48 PM
Moonrise: 11:29 PM
Moonset: 02:14 PM
Civil Twilight
6:25 AM to 6:52 AM CDT
6:48 PM to 7:14 PM CDT
Waning Crescent Moon
Waning Crescent Moon
Update is local observation time. What time is it in Alton? 7:53 AM Tuesday, September 28, 2021

Alton, IL Weather Forecast

°F Click to change Alton weather to Imperial units.Click to change Alton weather to Metric units. °C

Alton 14 Day Weather Outlook

Note: Our 7 day Alton weather forecast is our most reliable forecast. This model should only be used as a probable scenario. Forecasting more than 7 days ahead is challenging.
Tue
Sep 28

Partly cloudy, 0002 sunny intervals
Partly cloudy, high 91°F33°C, low 64°F,18°C, chance of precipitation 0%, wind SSW 10 mph,SSW 17 km/h, barometric pressure 29.88 in,1012 mb, visibility 6 mi10 km, humidity 54%.
Wed
Sep 29

Partly cloudy, 0002 sunny intervals
Partly cloudy, high 90°F32°C, low 66°F,19°C, chance of precipitation 0%, wind SE 13 mph,SE 21 km/h, barometric pressure 29.94 in,1014 mb, visibility 6 mi10 km, humidity 62%.
Thu
Sep 30

Heavy rain, 0018 cloudy with heavy rain
Heavy rain, high 76°F24°C, low 68°F,20°C, chance of precipitation 85%, wind SE 15 mph,SE 23 km/h, barometric pressure 30 in,1016 mb, visibility 6 mi9 km, humidity 91%.
Fri
Oct 1

Heavy rain, 0018 cloudy with heavy rain
Heavy rain, high 83°F29°C, low 65°F,19°C, chance of precipitation 87%, wind SSE 12 mph,SSE 19 km/h, barometric pressure 30.03 in,1017 mb, visibility 6 mi9 km, humidity 83%.
Sat
Oct 2

Moderate rain, 0018 cloudy with heavy rain
Moderate rain, high 73°F23°C, low 68°F,20°C, chance of precipitation 85%, wind WSW 7 mph,WSW 12 km/h, barometric pressure 30 in,1016 mb, visibility 4 mi7 km, humidity 94%.
Sun
Oct 3

Patchy rain possible, 0009 light rain showers
Patchy rain possible, high 77°F25°C, low 65°F,18°C, chance of precipitation 78%, wind WNW 9 mph,WNW 14 km/h, barometric pressure 29.97 in,1015 mb, visibility 5 mi8 km, humidity 83%.
Mon
Oct 4

Patchy rain possible, 0009 light rain showers
Patchy rain possible, high 75°F24°C, low 59°F,15°C, chance of precipitation 79%, wind SW 11 mph,SW 18 km/h, barometric pressure 30 in,1016 mb, visibility 6 mi10 km, humidity 74%.
Tue
Oct 5

Patchy rain possible, 0009 light rain showers
Patchy rain possible, high 71°F21°C, low 62°F,17°C, chance of precipitation 83%, wind NE 8 mph,NE 12 km/h, barometric pressure 30.09 in,1019 mb, visibility 6 mi10 km, humidity 84%.
Wed
Oct 6

Patchy rain possible, 0009 light rain showers
Patchy rain possible, high 76°F24°C, low 58°F,15°C, chance of precipitation 80%, wind ESE 8 mph,ESE 13 km/h, barometric pressure 30.12 in,1020 mb, visibility 6 mi10 km, humidity 74%.
Thu
Oct 7

Patchy rain possible, 0009 light rain showers
Patchy rain possible, high 80°F27°C, low 63°F,17°C, chance of precipitation 74%, wind SSE 14 mph,SSE 22 km/h, barometric pressure 30 in,1016 mb, visibility 6 mi10 km, humidity 75%.
Fri
Oct 8

Patchy rain possible, 0009 light rain showers
Patchy rain possible, high 81°F27°C, low 64°F,18°C, chance of precipitation 84%, wind SSW 11 mph,SSW 17 km/h, barometric pressure 29.94 in,1014 mb, visibility 6 mi9 km, humidity 79%.
Sat
Oct 9

Patchy rain possible, 0009 light rain showers
Patchy rain possible, high 89°F32°C, low 65°F,18°C, chance of precipitation 72%, wind SE 9 mph,SE 14 km/h, barometric pressure 29.97 in,1015 mb, visibility 6 mi10 km, humidity 70%.
Sun
Oct 10

Patchy rain possible, 0009 light rain showers
Patchy rain possible, high 82°F28°C, low 69°F,20°C, chance of precipitation 76%, wind SSE 13 mph,SSE 21 km/h, barometric pressure 29.94 in,1014 mb, visibility 6 mi10 km, humidity 78%.
Mon
Oct 11

Partly cloudy, 0002 sunny intervals
Partly cloudy, high 85°F29°C, low 71°F,22°C, chance of precipitation 0%, wind S 18 mph,S 30 km/h, barometric pressure 29.91 in,1013 mb, visibility 6 mi10 km, humidity 69%.
Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 340 AM EDT Tue Sep 28 2021 Valid Tue Sep 28 2021 - Thu Sep 30 2021 ...Severe thunderstorms possible across portions of the Mid-Atlantic today... ...Increasing chances for thunderstorms and heavy rain found throughout the central and southern Plains through midweek... ...Record breaking warmth and critical fire weather forecast across the Northern Plains... The weather pattern across much of the Lower 48 is set become slightly more active to end the month of September. In the East, a cold front dropping south across the Northeast and Mid-Atlantic today will usher in cooler and more fall-like temperatures. However, a few strong to locally severe thunderstorms may develop along this frontal boundary this afternoon. Isolated thunderstorms will have the potential to produce damaging wind gusts and large hail. The Storm Prediction Center has issued a Slight Risk (level 2/5) of severe weather between northern Virginia and southern New Jersey. Farther west, a cold front currently pushing across the Northern Rockies and Intermountain West is expected to continue marching eastward until reaching the Northern Plains and Central Rockies by Wednesday, followed by the Southern Plains on Thursday. Scattered showers and much cooler temperatures are forecast behind the cold front, with a few snowflakes mixing into the highest elevations of the Rockies as well. Once the frontal boundary reaches the Great Plains on Wednesday, it will clash with a warm tropical airmass funneling out of the western Gulf of Mexico and spark numerous clusters of the showers and thunderstorms. The main concern with these storms across the Central Plains will be associated with heavy rain and the potential for isolated instances of flash flooding. By Thursday, the heavy rain threat will shift southward and into the Southern Plains. Meanwhile, the aforementioned tropical airmass will also help aid thunderstorm development across Texas and Lower Mississippi Valley over the next few days ahead of the approaching weather system. Slow-moving thunderstorms along with intense rainfall rates could produce isolated flash flooding. A few severe thunderstorms are also not out of the question across central Texas and southwestern Oklahoma along a dryline this afternoon. One more day of record-breaking warmth is forecast throughout the Northern Plains today as highs soar 20 to 30 degrees above average. High temperatures are forecast to soar into the upper 80s and 90s throughout much of the Great Plains and parts of the Midwest. A dozen daily high temperature records could fall across Nebraska and the Dakotas. By Wednesday, this wave of unseasonably warm temperatures will shift out of the Northern Plains into the Upper Midwest. In conjunction with the late-September heat, gusty winds and low relative humidity will make for dangerous fire weather conditions across the Northern Plains today. Red Flag Warnings have been issued throughout southeast Montana, northern Wyoming and the western Dakota in order to highlight the potential for new wildfires to spread uncontrollably. Snell Graphics are available at https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php
Storm Prediction Center
United States 2 Day Forecast
WPC Short Range Forecasts (Days ½-2½)