My Profile
  1. Member Settings
  2. My Devices
  3. Sign Out
Log In
    Favorites
        More Settings
      Elev 55 ft, 33.937 °N 80.391 °W

      Sumter, SC

      Sunway Knolls Station87°
      Updated: 12:24 PM EDT on September 22, 2026 (GMT -4)
      2 minutes ago
      89°
      71°
      87
      Feels Like 95
      Cloudy
      N
      9
      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
        Tue 09/22
        High 89°f
         58% Precip. / 0.02 in
        Scattered thunderstorms. High 89F. Winds ENE at 5 to 10 mph. Chance of rain 60%. Locally heavy rainfall possible.
        Tonight
        Tue 09/22
        Low 69°f
         58% Precip. / 0.17 in
        Scattered thunderstorms early, then cloudy skies after midnight. Low 69F. Winds NE at 5 to 10 mph. Chance of rain 60%. Locally heavy rainfall possible.
        Tomorrow
        Wed 09/23
        High 78°f62°f
         24% Precip. / 0 in
        Overcast. Slight chance of a rain shower. High 78F. Winds NE at 10 to 15 mph.
        Hourly Forecast
        Now
        87°
        1PM
        88°
        2PM
        89°
        3PM
        89°
        4PM
        87°
        5PM
        85°
        6PM
        58%
        82°
        7PM
        58%
        79°
        7:18PM
        Sunset
        8PM
        78°
        9PM
        50%
        75°
        10PM
        74°
        11PM
        73°
        12AM
        73°
        1AM
        73°
        2AM
        72°
        3AM
        71°
        4AM
        71°
        5AM
        70°
        6AM
        70°
        7AM
        70°
        7:10AM
        Sunrise
        8AM
        70°
        9AM
        71°
        10AM
        72°
        11AM
        74°
        12PM
        75°
        Precipitation
        58%
        Thunderstorms possible after 6 PM
        Pollen
        None
        Air Quality
        36
        Good
        UV Index
        5
        Moderate
        Additional Conditions
        1. Pressure 30 in
        2. Visibility 10 miles
        3. Clouds Cloudy
        4. Dew Point72°F
        5. Humidity 61%
        6. Rainfall 0 in
        7. Snow Depth 0 in
         KSMS Station History
        Almanac for September 22, 2026
        1. Forecast Average Record
        2. Temperature
        3. High 89°F 82°F 96°F 1940
        4. Low 71°F 61°F 45°F 1938
        5. Rain/Snow Depth
        6. Precipitation 0.19 in 3.1 in -
        7. Snow 0 in 0 in -
        Almanac for September 23, 2026
        1. Forecast Average Record
        2. Temperature
        3. High 78°F 82°F 97°F
        4. Low 71°F 61°F 44°F
        Astronomy
        1. Sun Rise Set
        2. Actual Time 7:09 AM 7:18 PM
        3. Civil Twilight 6:44 AM 7:43 PM
        4. Nautical Twilight 6:15 AM 8:12PM
        5. Astronomical Twilight 5:46 AM 8:41 PM
        1. Length of Visible Light 12h 58m
        2. Length of Day 12h 8m
        3. Tomorrow will be 2 minutes 6 seconds shorter
        1. Moon 5:13 PM 2:57 AM
        2. Waxing Gibbous85% of the Moon is Illuminated
        Sep 26
        Full Moon
        Oct 3
        Waning Half Last Qtr
        Oct 10
        New Moon
        Oct 18
        Waxing Half First Qtr
        Nearby Weather Stations
        Station Location
        Temp
        Windchill
        Heat Index
        Dew Point
        Humidity
        Wind
        Precip.
        Elev.
        Updated
        Loading nearby stations…
        Precipitation
        Loading…
        Health
        Loading…
        Weather Alerts
        Loading…
        Our AppsAbout UsContactCareersWeather Data APIs
        PWS NetworkWundermap
        Terms of UsePrivacy PolicyCookie NoticeAccessibility StatementAdChoicesData Vendors
        essentialaccessibility.com
        We recognize our responsibility to use data and technology for good. We may use or share your data with our data vendors. Take control of your data.
        Review All Privacy and Ad Settings
        Choose how my information is shared
        Data Rights
        The Weather Company The Weather Channel Weather Underground Storm Radar
        © The Weather Company, LLC 2026
        Glossary