367
FZUS53 KLOT 220158
SRFLOT

Surf Zone Forecast for Lake Michigan Beaches
National Weather Service Chicago IL
858 PM CDT Thu Aug 21 2025

ILZ006-220915-
Lake-
Including the beaches of Illinois Beach State Park
858 PM CDT Thu Aug 21 2025

.TONIGHT...
Swim Risk*..................Low.
Wave Height.................1 to 3 feet.
Water Temperature...........70-74.
Weather.....................Mostly clear. Patchy fog late.
Low Temperature.............In the mid 60s.
Winds.......................North winds 5 to 10 mph.

.FRIDAY...
Swim Risk*..................Low.
Wave Height.................1 to 2 feet.
Weather.....................Partly cloudy. Patchy fog early in the
                            morning.
High Temperature............In the upper 70s.
Winds.......................Northwest winds around 5 mph, becoming
                            east around 5 mph in the afternoon.

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

$$

ILZ103-104-220915-
Northern Cook-Central Cook-
Including the beaches of Chicago Park District
858 PM CDT Thu Aug 21 2025

.TONIGHT...
Swim Risk*..................Low.
Wave Height.................1 to 3 feet.
Water Temperature...........69-73.
Weather.....................Partly cloudy. Patchy fog late.
Low Temperature.............In the upper 60s.
Winds.......................Northeast winds 5 to 10 mph.

.FRIDAY...
Swim Risk*..................Low.
Wave Height.................1 to 2 feet.
Weather.....................Partly cloudy. Patchy fog early in the
                            morning.
High Temperature............In the upper 70s.
Winds.......................North winds around 5 mph, becoming
                            northeast around 5 mph in the
                            afternoon.

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

$$

INZ001-220915-
Lake-
Including the beaches of Indiana Dunes National Park
858 PM CDT Thu Aug 21 2025

.TONIGHT...
Swim Risk*..................Moderate.
Wave Height.................2 to 4 feet subsiding to 1 to 3 feet.
Water Temperature...........72-76.
Weather.....................Mostly cloudy, then becoming partly
                            cloudy. Patchy fog late.
Low Temperature.............In the upper 60s.
Winds.......................Northeast winds around 10 mph, becoming
                            east 5 to 10 mph late.

.FRIDAY...
Swim Risk*..................Low.
Wave Height.................1 to 3 feet.
Weather.....................Partly cloudy. Patchy fog early in the
                            morning.
High Temperature............In the upper 70s.
Winds.......................Light and variable winds, becoming north
                            around 5 mph in the afternoon.

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

$$

INZ002-220915-
Porter-
Including the beaches of Indiana Dunes National Park
858 PM CDT Thu Aug 21 2025

.TONIGHT...
Swim Risk*..................Moderate.
Wave Height.................2 to 4 feet subsiding to 1 to 3 feet.
Water Temperature...........72-76.
Weather.....................Partly cloudy. Patchy fog late.
Low Temperature.............In the mid 60s.
Winds.......................Northeast winds around 10 mph, becoming
                            east 5 to 10 mph late.

.FRIDAY...
Swim Risk*..................Low.
Wave Height.................1 to 3 feet.
Weather.....................Partly cloudy. Patchy fog early in the
                            morning.
High Temperature............In the upper 70s.
Winds.......................South winds around 5 mph, becoming
                            north around 5 mph in the afternoon.

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


$$