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      Elev 525 ft, 40.006 °N 89.848 °W

      Petersburg, IL

      Petersburg Station80°
      Updated: 10:42 AM CDT on September 6, 2026 (GMT -5)
      4 minutes ago
      85°
      65°
      80
      Feels Like 82
      Partly Cloudy
      N
      8
      Lower temperature is expected today
      50
      50
      575
      90
      50
      7
      0 mph
      50
      50
      50
      50
      50
      50
      Radar · Now
        Hyper-local data from Weather Underground's network of
        400,000+ personal weather stations worldwide
        Today
        Mon 09/07
        High 85°f
         1% Precip. / 0 in
        Sun and clouds mixed. High near 85F. Winds ENE at 5 to 10 mph.
        Tonight
        Mon 09/07
        Low 60°f
         8% Precip. / 0 in
        A few clouds. Low around 60F. Winds ENE at 5 to 10 mph.
        Tomorrow
        Tue 09/08
        High 85°f60°f
         8% Precip. / 0 in
        Mostly sunny skies. High near 85F. Winds E at 5 to 10 mph.
        Hourly Forecast
        Now
        79°
        11AM
        80°
        12PM
        82°
        1PM
        84°
        2PM
        84°
        3PM
        84°
        4PM
        84°
        5PM
        84°
        6PM
        82°
        7PM
        79°
        7:22PM
        Sunset
        8PM
        75°
        9PM
        72°
        10PM
        71°
        11PM
        69°
        12AM
        68°
        1AM
        66°
        2AM
        64°
        3AM
        63°
        4AM
        62°
        5AM
        62°
        6AM
        61°
        6:33AM
        Sunrise
        7AM
        61°
        8AM
        64°
        9AM
        69°
        10AM
        73°
        Precipitation
        8%
        Pollen
        Ragweed Pollen
        Moderate
        Air Quality
        54
        Moderate
        UV Index
        5
        Moderate
        Additional Conditions
        1. Pressure 30.04 in
        2. Visibility 10 miles
        3. Clouds Partly Cloudy
        4. Dew Point68°F
        5. Humidity 69%
        6. Rainfall 0 in
        7. Snow Depth 0 in
         KSPI Station History
        Almanac for September 6, 2026
        1. Forecast Average Record
        2. Temperature
        3. High 85°F 83°F 100°F 1954
        4. Low 65°F 60°F 40°F 1988
        5. Rain/Snow Depth
        6. Precipitation 0 in 3.5 in -
        7. Snow 0 in 0 in -
        Almanac for September 7, 2026
        1. Forecast Average Record
        2. Temperature
        3. High 85°F 83°F 100°F
        4. Low 65°F 59°F 41°F
        Astronomy
        1. Sun Rise Set
        2. Actual Time 6:31 AM 7:22 PM
        3. Civil Twilight 6:04 AM 7:50 PM
        4. Nautical Twilight 5:31 AM 8:22PM
        5. Astronomical Twilight 4:57 AM 8:56 PM
        1. Length of Visible Light 13h 45m
        2. Length of Day 12h 50m
        3. Tomorrow will be 2 minutes 34 seconds shorter
        1. Moon 12:58 AM 4:52 PM
        2. Waning Crescent28% of the Moon is Illuminated
        Sep 10
        New Moon
        Sep 18
        Waxing Half First Qtr
        Sep 26
        Full Moon
        Oct 3
        Waning Half Last Qtr
        Precipitation
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