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      Flood Watch
      until 12:00 PM EDT
      Elev 112 ft, 40.178 °N 75.454 °W

      Collegeville, PA

      Yerkes Station80°
      Updated: 12:22 PM EDT on September 12, 2026 (GMT -4)
      10 minutes ago
      81°
      55°
      80
      Feels Like 83
      Cloudy
      N
      5
      Similar 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
        Sat 09/12
        High 81°f
         0% Precip. / 0 in
        Cloudy. High 81F. Winds SSE at 5 to 10 mph.
        Tonight
        Sat 09/12
        Low 70°f
         69% Precip. / 0.35 in
        Cloudy skies this evening followed by thunderstorms late. Low near 70F. Winds ESE at 5 to 10 mph. Chance of rain 70%. Locally heavy rainfall possible.
        Tomorrow
        Sun 09/13
        High 84°f66°f
         85% Precip. / 0.07 in
        Thunderstorms in the morning, then partly cloudy late. High 84F. Winds light and variable. Chance of rain 90%.
        Hourly Forecast
        Now
        78°
        1PM
        79°
        2PM
        80°
        3PM
        81°
        4PM
        81°
        5PM
        80°
        6PM
        79°
        7PM
        77°
        7:15PM
        Sunset
        8PM
        75°
        9PM
        74°
        10PM
        73°
        11PM
        73°
        12AM
        72°
        1AM
        72°
        2AM
        61%
        72°
        3AM
        56%
        71°
        4AM
        46%
        71°
        5AM
        67%
        72°
        6AM
        70%
        72°
        6:40AM
        Sunrise
        7AM
        85%
        71°
        8AM
        61%
        71°
        9AM
        31%
        73°
        10AM
        74°
        11AM
        76°
        12PM
        78°
        Precipitation
        85%
        Pollen
        Ragweed Pollen
        Moderate
        Air Quality
        38
        Good
        UV Index
        4
        Moderate
        Additional Conditions
        1. Pressure 30.08 in
        2. Visibility 10 miles
        3. Clouds Cloudy
        4. Dew Point61°F
        5. Humidity 57%
        6. Rainfall 0 in
        7. Snow Depth 0 in
         KPTW Station History
        Almanac for September 12, 2026
        1. Forecast Average Record
        2. Temperature
        3. High 81°F 80°F 98°F 1983
        4. Low 55°F 54°F 32°F 1995
        5. Rain/Snow Depth
        6. Precipitation 0.35 in 3.3 in -
        7. Snow 0 in 0 in -
        Almanac for September 13, 2026
        1. Forecast Average Record
        2. Temperature
        3. High 84°F 79°F 91°F
        4. Low 55°F 54°F 37°F
        Astronomy
        1. Sun Rise Set
        2. Actual Time 6:39 AM 7:15 PM
        3. Civil Twilight 6:12 AM 7:42 PM
        4. Nautical Twilight 5:40 AM 8:14PM
        5. Astronomical Twilight 5:06 AM 8:48 PM
        1. Length of Visible Light 13h 30m
        2. Length of Day 12h 35m
        3. Tomorrow will be 2 minutes 36 seconds shorter
        1. Moon 8:16 AM 7:47 PM
        2. Waxing Crescent2% of the Moon is Illuminated
        Sep 18
        Waxing Half First Qtr
        Sep 26
        Full Moon
        Oct 3
        Waning Half Last Qtr
        Oct 10
        New Moon
        Precipitation
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