266
FZUS53 KLOT 202100
SRFLOT

Surf Zone Forecast for Lake Michigan Beaches
National Weather Service Chicago IL
400 PM CDT Thu Aug 20 2026

ILZ006-212100-
Lake-
Including the beaches of Illinois Beach State Park
400 PM CDT Thu Aug 20 2026

.REST OF TODAY...
Swim Risk*..................Low.
Wave Height.................1 to 3 feet.
Water Temperature...........71-75.
Weather.....................Mostly sunny.
High Temperature............In the mid 70s.
Winds.......................Northeast winds 5 to 10 mph.

.TONIGHT...
Swim Risk*..................Low.
Wave Height.................1 to 2 feet.
Weather.....................Partly cloudy.
Low Temperature.............In the lower 60s.
Winds.......................Variable winds 5 mph or less.

.FRIDAY...
Swim Risk*..................Low.
Wave Height.................1 to 2 feet.
Weather.....................Mostly cloudy. A chance of showers and
                            thunderstorms.
High Temperature............Around 80.
Winds.......................Southwest winds 5 to 10 mph.

.SWIM RISK OUTLOOK...
.FRIDAY NIGHT...Low swim risk*.
.SATURDAY...Low swim risk*.
.SATURDAY NIGHT...Low swim risk*.
.SUNDAY...Moderate swim risk*.
.SUNDAY NIGHT...Low swim risk*.
.MONDAY...Low swim risk*.

&&

Swim Risk Category
* Low Risk - Large waves and dangerous currents are not expected,
however dangerous currents may exist at any time near piers,
breakwalls, and river outlets.
* Moderate Risk - Breaking waves and currents are expected. Stay away
from dangerous areas like piers, breakwalls, and river outlets.
Always have a flotation device with you in the water.
* High Risk - Life-threatening waves and currents are expected. Stay
out of the water and stay away from dangerous areas like piers and
breakwalls.

** For thunderstorm, waterspout, and UV definitions see:
https://www.weather.gov/beach/lot

$$

ILZ103-104-212100-
Northern Cook-Central Cook-
Including the beaches of Chicago Park District
400 PM CDT Thu Aug 20 2026

.REST OF TODAY...
Swim Risk*..................Low.
Wave Height.................1 to 3 feet.
Water Temperature...........71-75.
Weather.....................Mostly sunny.
High Temperature............In the upper 70s.
Winds.......................Northeast winds 5 to 10 mph.

.TONIGHT...
Swim Risk*..................Low.
Wave Height.................1 to 3 feet.
Weather.....................Partly cloudy.
Low Temperature.............In the mid 60s.
Winds.......................Variable winds 5 mph or less.

.FRIDAY...
Swim Risk*..................Low.
Wave Height.................Around 1 foot.
Weather.....................Mostly cloudy, then becoming mostly
                            cloudy. A slight chance of showers and
                            thunderstorms in the afternoon.
High Temperature............In the lower 80s.
Winds.......................South winds 5 to 10 mph.

.SWIM RISK OUTLOOK...
.FRIDAY NIGHT...Low swim risk*.
.SATURDAY...Low swim risk*.
.SATURDAY NIGHT...Moderate swim risk*.
.SUNDAY...Moderate swim risk*.
.SUNDAY NIGHT...Low swim risk*.
.MONDAY...Low swim risk*.

&&

Swim Risk Category
* Low Risk - Large waves and dangerous currents are not expected,
however dangerous currents may exist at any time near piers,
breakwalls, and river outlets.
* Moderate Risk - Breaking waves and currents are expected. Stay away
from dangerous areas like piers, breakwalls, and river outlets.
Always have a flotation device with you in the water.
* High Risk - Life-threatening waves and currents are expected. Stay
out of the water and stay away from dangerous areas like piers and
breakwalls.

** For thunderstorm, waterspout, and UV definitions see:
https://www.weather.gov/beach/lot

$$

INZ001-212100-
Lake-
Including the beaches of Indiana Dunes National Park
400 PM CDT Thu Aug 20 2026

.REST OF TODAY...
Swim Risk*..................Low.
Wave Height.................1 to 3 feet.
Water Temperature...........71-75.
Weather.....................Mostly sunny.
High Temperature............In the upper 70s.
Winds.......................North winds 10 to 15 mph.

.TONIGHT...
Swim Risk*..................Low.
Wave Height.................1 to 3 feet.
Weather.....................Partly cloudy.
Low Temperature.............In the lower 60s.
Winds.......................Northeast winds 5 to 10 mph, becoming
                            light and variable after midnight.

.FRIDAY...
Swim Risk*..................Low.
Wave Height.................Around 1 foot.
Weather.....................Partly cloudy becoming mostly cloudy in
                            the afternoon.
High Temperature............Around 80.
Winds.......................South winds 5 to 10 mph.

.SWIM RISK OUTLOOK...
.FRIDAY NIGHT...Low swim risk*.
.SATURDAY...Moderate swim risk*.
.SATURDAY NIGHT...Moderate swim risk*.
.SUNDAY...High swim risk*.
.SUNDAY NIGHT...Moderate swim risk*.
.MONDAY...Low swim risk*.

&&

Swim Risk Category
* Low Risk - Large waves and dangerous currents are not expected,
however dangerous currents may exist at any time near piers,
breakwalls, and river outlets.
* Moderate Risk - Breaking waves and currents are expected. Stay away
from dangerous areas like piers, breakwalls, and river outlets.
Always have a flotation device with you in the water.
* High Risk - Life-threatening waves and currents are expected. Stay
out of the water and stay away from dangerous areas like piers and
breakwalls.

** For thunderstorm, waterspout, and UV definitions see:
https://www.weather.gov/beach/lot

$$

INZ002-212100-
Porter-
Including the beaches of Indiana Dunes National Park
400 PM CDT Thu Aug 20 2026

.REST OF TODAY...
Swim Risk*..................Low.
Wave Height.................1 to 3 feet.
Water Temperature...........72-76.
Weather.....................Mostly sunny.
High Temperature............In the mid 70s.
Winds.......................North winds 10 to 15 mph.

.TONIGHT...
Swim Risk*..................Low.
Wave Height.................1 to 3 feet.
Weather.....................Partly cloudy.
Low Temperature.............In the lower 60s.
Winds.......................Northeast winds 5 to 10 mph, becoming
                            light and variable after midnight.

.FRIDAY...
Swim Risk*..................Low.
Wave Height.................1 foot or less.
Weather.....................Partly cloudy, then becoming mostly
                            cloudy.
High Temperature............In the upper 70s.
Winds.......................South winds around 5 mph.

.SWIM RISK OUTLOOK...
.FRIDAY NIGHT...Low swim risk*.
.SATURDAY...High swim risk*.
.SATURDAY NIGHT...Moderate swim risk*.
.SUNDAY...High swim risk*.
.SUNDAY NIGHT...High swim risk*.
.MONDAY...Low swim risk*.

&&

Swim Risk Category
* Low Risk - Large waves and dangerous currents are not expected,
however dangerous currents may exist at any time near piers,
breakwalls, and river outlets.
* Moderate Risk - Breaking waves and currents are expected. Stay away
from dangerous areas like piers, breakwalls, and river outlets.
Always have a flotation device with you in the water.
* High Risk - Life-threatening waves and currents are expected. Stay
out of the water and stay away from dangerous areas like piers and
breakwalls.

** For thunderstorm, waterspout, and UV definitions see:
https://www.weather.gov/beach/lot


$$