Click for Hazardous Weather Outlook for Lake Koshkonong, Wisconsin
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Weather Conditions for Lake Koshkonong, Wisconsin : Jefferson County
Issued: 12:46 pm CDT Sep 4, 2026 Latitude: 42.9097273 Longitude: -88.9195531 View on Google Maps

MouseOver for Detail Forecast
This Afternoon Tonight Saturday Sunday Labor Day Tuesday Wednesday Thursday
50% chance of thunderstorms on This Afternoon 30% chance of thunderstorms on Tonight Morning Fog on Saturday Mostly Sunny on Sunday Mostly Sunny on Labor Day 20% chance of thunderstorms on Tuesday 20% chance of thunderstorms on Wednesday 20% chance of  on Thursday
High: 83°F Low: 70°F High: 82°F High: 81°F High: 81°F High: 83°F High: 85°F High: 79°F
Low: 60°F Low: 61°F Low: 63°F Low: 70°F Low: 65°F  
Thunderstorms Thunderstorms Morning Fog Mostly Sunny Mostly Sunny Thunderstorms Thunderstorms Partly Sunny
Current Conditions at
WATERTOWN - (KRYV)
75°
Clear
as of 12:35 PM CDST
Rel. Humidity: 88%
Dew Point: 72°F
Visibility: 10 Miles
Pressure: 29.95 in.
Flight Rule: VFR
Wind Data
12 MPH
190° South
Cloud Level(s): Clear
Current Conditions at
MADISON - (KMSN)
75°
Clear
Thunderstorm
as of 12:12 PM CDST
Rel. Humidity: 78%
Dew Point: 68°F
Visibility: 10 Miles
Pressure: 29.96 in.
Flight Rule: VFR
Wind Data
14 MPH
Gust: 24 MPH
190° South
Cloud Level(s): Few Cumulonimbus at 8000ft, Broken at 13000ft, Broken at 16000ft, Broken at 25000ft
Current Conditions at
BURLINGTON MUNICIPAL AIR - (KBUU)
75°
Clear
as of 12:35 PM CDST
Rel. Humidity: 88%
Dew Point: 72°F
Visibility: 10 Miles
Pressure: 29.95 in.
Flight Rule: VFR
Wind Data
8 MPH
200° South
Cloud Level(s): Clear
50% chance of thunderstorms This Afternoon This Afternoon... Scattered showers and thunderstorms, mainly before 4pm. Partly sunny, with a high near 83. South wind 5 to 10 mph becoming west. Chance of precipitation is 50%.

30% chance of thunderstorms Tonight Tonight... A 30 percent chance of showers and thunderstorms before 11pm. Patchy fog after midnight. Otherwise, partly cloudy, with a low around 70. West wind around 5 mph becoming calm in the evening.

Morning Fog on Saturday Saturday... Areas of fog before 10am. Otherwise, partly sunny, with a high near 82. North wind 5 to 10 mph.

Cloudy on Saturday Night Saturday Night... Partly cloudy, with a low around 60. Northeast wind 5 to 10 mph becoming light after midnight.

Mostly Sunny on Sunday Sunday... Mostly sunny, with a high near 81. Calm wind becoming east around 5 mph in the morning.

Cloudy on Sunday Night Sunday Night... Partly cloudy, with a low around 61. East wind around 5 mph becoming calm in the evening.

Mostly Sunny on Labor Day Labor Day... Mostly sunny, with a high near 81. Calm wind becoming southeast around 5 mph in the morning.

Mostly Cloudy on Monday Night Monday Night... Mostly cloudy, with a low around 63. Southeast wind 5 to 10 mph.

20% chance of thunderstorms Tuesday Tuesday... A slight chance of showers, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 83. Chance of precipitation is 20%.

60% chance of thunderstorms Tuesday Night Tuesday Night... A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 70. Chance of precipitation is 60%.

20% chance of thunderstorms Wednesday Wednesday... A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 85.

30% chance of thunderstorms Wednesday Night Wednesday Night... A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 65.

20% chance of  Thursday Thursday... A 20 percent chance of showers. Partly sunny, with a high near 79.

Current Radar Image


Sun Almanac for Lake Koshkonong, Wisconsin
Astronomical Sunrise 04:44 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 05:20 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 05:55 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 06:24 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: 13 Hours 01 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 7:25 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 7:54 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 8:29 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 9:05 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 59 Minutes
Nautical Rise to Set: 15 Hours 9 Minutes
Astro Rise to Set: 16 Hours 21 Minutes

Click for yearly Sun Almanac for Lake Koshkonong
Moon Almanac for Lake Koshkonong, Wisconsin
Moon Phase: Last Quarter
Moon Illumination: 45%
Moon Age: 22.6 Days
Moon is currently above the horizon
Distance from Moon to Earth: 225,950 miles
Upcoming Lunar Events for
Lake Koshkonong:
Next EventEvent TimeIllum

Moonset:03:08 pm Fri44.6%
Moonrise:11:34 pm Fri40.6%
High Moon:07:53 am Sat36.6%
Moonset:04:10 pm Sat32.8%
New Moon: Wed Aug 12
First Quarter: Wed Aug 19
Full Moon: Fri Aug 28
Last Quarter: Fri Sep 4
New Moon: Thu Sep 10
Click for Monthly Moon Almanac
Wisconsin's Current Temperatures
Wisconsin's Current Temperature Map


Wisconsin's Satellite ImageWisconsin Satellite Image

Wisconsin's Current Wind DirectionWisconsin's Current Wind Direction

National Summary
of upper and lower values of current conditions amongst 5387 locations
in the contiguous United States
High
Temp
100° Mount Carmel Municipal, Illinois
and 5 other locations
Low
Temp
39° Mullan Pass, Idaho
Wind
Speed
37mph Parkersburg, West Virginia
Wind
Gust
59mph Parkersburg, West Virginia
Wind
Chill
42° Pagosa Springs, Colorado
Heat
Index
119° Corning Municipal A/P, Arkansas
High
Pressure
30.73Hg Salida Mountain, Colorado
Low
Pressure
29.72Hg Malta, Montana
# Locations Reporting Rain 35
# Locations Reporting Thunderstorms / Lightning 28
# Locations Reporting Fog 2
Average Temperature in the Contiguous USA 83°
Wisconsin State Summary
of upper and lower values of current conditions amongst 46 locations
in Wisconsin
High
Temp
88° Prairie Du Chien
and 1 other location
Low
Temp
63° Superior
Wind
Speed
17mph Kenosha
Wind
Gust
25mph Kenosha
Heat
Index
97° Black River Falls
and 1 other location
High
Pressure
29.99Hg Kings
Low
Pressure
29.88Hg Black River Falls
Average temperature in Wisconsin 76°
# Locations Reporting Thunderstorms 1
# Locations Reporting MVFR
(Marginal Visual Flight Rules)
1
# Locations Reporting VFR
(Visual Flight Rules)
45