Click for Hazardous Weather Outlook for Koshkonong Mounds, Wisconsin
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Weather Conditions for Koshkonong Mounds, Wisconsin : Jefferson County
Issued: 1:21 am CDT Sep 15, 2026 Latitude: 42.874173 Longitude: -88.9120532 View on Google Maps

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Overnight Tuesday Wednesday Thursday Friday Saturday Sunday Monday
90% chance of thunderstorms on Overnight 80% chance of thunderstorms on Tuesday Partly Sunny on Wednesday 20% chance of thunderstorms on Thursday 50% chance of rain on Friday 70% chance of thunderstorms on Saturday 30% chance of thunderstorms on Sunday Mostly Sunny on Monday
Low: 62°F High: 75°F High: 71°F High: 76°F High: 73°F High: 77°F High: 70°F High: 69°F
Low: 55°F Low: 60°F Low: 58°F Low: 60°F Low: 58°F Low: 52°F  
Thunderstorms Thunderstorms Partly Sunny Thunderstorms Rain Thunderstorms Thunderstorms Mostly Sunny
Current Conditions at
JANESVILLE - (KJVL)
68°
Clear
as of 1:15 AM CDST
Rel. Humidity: 56%
Dew Point: 52°F
Visibility: 10 Miles
Pressure: 29.91 in.
Flight Rule: VFR
Wind Data
17 MPH
Gust: 23 MPH
180° South
Cloud Level(s): Clear
Current Conditions at
WATERTOWN - (KRYV)
64°
Cloudy
Light Rain
as of 1:15 AM CDST
Rel. Humidity: 63%
Dew Point: 52°F
Visibility: 10 Miles
Pressure: 29.96 in.
Flight Rule: VFR
Wind Data
6 MPH
Gust: 25 MPH
300° Northwest
Cloud Level(s): Solid Overcast at 6000ft
Current Conditions at
MADISON - (KMSN)
61°
Cloudy
Heavy Thunderstorm Rain Mist
as of 1:16 AM CDST
Rel. Humidity: 87%
Dew Point: 57°F
Visibility: 1 3/4 Miles
Pressure: 29.99 in.
Flight Rule: IFR
Wind Data
3 MPH
230° Southwest
Cloud Level(s): Scattered at 3000ft, Broken at 5000ft, Solid Overcast at 7000ft
Current Conditions at
BURLINGTON MUNICIPAL AIR - (KBUU)
68°
Partly Cloudy
as of 1:15 AM CDST
Rel. Humidity: 56%
Dew Point: 52°F
Visibility: 10 Miles
Pressure: 29.94 in.
Flight Rule: VFR
Wind Data
9 MPH
Gust: 16 MPH
180° South
Cloud Level(s): Scattered at 7000ft, Scattered at 8000ft
90% chance of thunderstorms Overnight Overnight... Scattered showers and thunderstorms, then showers and possibly a thunderstorm after 2am. Low around 62. Windy, with a south wind 20 to 25 mph, with gusts as high as 30 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

80% chance of thunderstorms Tuesday Tuesday... Showers and possibly a thunderstorm before 11am, then scattered showers between 11am and 1pm. High near 75. Breezy, with a southwest wind 10 to 20 mph, with gusts as high as 25 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.

Mostly Cloudy on Tuesday Night Tuesday Night... Mostly cloudy, with a low around 55. Northwest wind around 5 mph becoming north after midnight.

Partly Sunny on Wednesday Wednesday... Partly sunny, with a high near 71. East wind 5 to 10 mph.

50% chance of thunderstorms Wednesday Night Wednesday Night... A 50 percent chance of showers and thunderstorms, mainly after 1am. Increasing clouds, with a low around 60. East wind 5 to 10 mph.

20% chance of thunderstorms Thursday Thursday... A slight chance of showers and thunderstorms before 7am, then a slight chance of showers between 7am and 1pm. Mostly cloudy, with a high near 76. Northeast wind around 5 mph becoming north in the afternoon. Chance of precipitation is 20%.

Mostly Cloudy on Thursday Night Thursday Night... Mostly cloudy, with a low around 58. Northeast wind around 5 mph.

50% chance of rain Friday Friday... A 50 percent chance of showers. Mostly cloudy, with a high near 73. East wind 5 to 10 mph.

80% chance of thunderstorms Friday Night Friday Night... A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 1am. Low around 60. Chance of precipitation is 80%.

70% chance of thunderstorms Saturday Saturday... Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 77. Chance of precipitation is 70%.

50% chance of thunderstorms Saturday Night Saturday Night... A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 58.

30% chance of thunderstorms Sunday Sunday... A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 70.

Mostly Cloudy on Sunday Night Sunday Night... Mostly cloudy, with a low around 52.

Mostly Sunny on Monday Monday... Mostly sunny, with a high near 69.

Wisconsin's Warnings, Watches, and AdvisoriesWisconsin's Watches, Warnings, and Advisories

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Sun Almanac for Koshkonong Mounds, Wisconsin
Astronomical Sunrise 04:59 AM?Astronomical sunrise occurs when the Sun is 18° below the horizon and the sky begins to brighten from a completly darkened state.
Nautical Sunrise 05:34 AM?Nautical sunrise (or nautical dawn) is the precise moment when the sun's center is 12° below the horizon in the morning. It marks the beginning of nautical twilight, allowing pilots/mariners to see the horizon.
Civil Sunrise 06:07 AM?Civil sunrise is the moment in the morning when the sun's center is 6° below the horizon. It marks the start of morning civil twilight, providing enough natural light for most, outdoor activities without artificial lighting. It typically occurs roughly 20-30 minutes before actual sunrise.
Sunrise 06:36 AM?Sunrise (or sunup) is the moment when the upper rim of the Sun appears on the horizon in the morning. It marks the end of the twilight phase, often accompanied by distinct atmospheric colors.

Daylight: 12 Hours 30 Minutes?Daylight hours are the period of time between local sunrise and sunset, representing the daily portion of sunlight. These hours change in length based on season, Earth's tilt, and latitude.

Sunset 7:06 PM?The sunset is defined in astronomy as the moment the upper limb of the Sun disappears below the horizon. It marks the end of daylight and is often accompanied by distinct atmospheric colors. It also signals the beginning of twilight.
Civil Sunset 7:34 PM?Civil sunset (or evening civil twilight) occurs when the center of the sun is 6° below the horizon, marking the end of the brightest twilight phase. It typically occurs roughly 20-30 minutes after sunset, providing enough light for most outdoor activities to continue without artificial light.
Nautical Sunset 8:08 PM?Nautical sunset occurs when the sun's center is 12° below the horizon, marking the end of nautical twilight. This phase, following civil twilight, allows the horizon to remain visible, enabling mariners to take accurate star sights for navigation. The sky is dark, but some ambient light remains
Astronomical Sunset 8:42 PM?Astronomical sunrise occurs when the Sun drops to 18° below the horizon. This causes the sky to enter a completly darkened state.

Civil Rise to Set: 13 Hours 27 Minutes
Nautical Rise to Set: 14 Hours 34 Minutes
Astro Rise to Set: 15 Hours 43 Minutes

Click for yearly Sun Almanac for Koshkonong Mounds
Moon Almanac for Koshkonong Mounds, Wisconsin
Moon Phase: Waxing Crescent
Moon Illumination: 18%
Moon Age: 4.12 Days
Moon is currently below the horizon
Distance from Moon to Earth: 247,355 miles
Upcoming Lunar Events for
Koshkonong Mounds:
Next EventEvent TimeIllum

Moonrise:11:41 am Tue20.9%
High Moon:04:21 pm Tue22.5%
Moonset:08:55 pm Tue24.1%
New Moon: Thu Sep 10
First Quarter: Fri Sep 18
Full Moon: Sat Sep 26
Last Quarter: Sat Oct 3
New Moon: Sat Oct 10
Click for Monthly Moon Almanac