668
FPUS53 KLSX 311023
ZFPLSX

Zone Forecasts
National Weather Service Saint Louis MO
523 AM CDT Mon Aug 31 2026

ILZ100-101-MOZ061-063-064-311800-
Madison IL-Saint Clair IL-Saint Charles MO-Saint Louis MO-
Saint Louis City MO-
Including the cities of Alton, Edwardsville, Belleville, Cahokia,
Saint Charles, and Saint Louis
523 AM CDT Mon Aug 31 2026

...HEAT ADVISORY IN EFFECT FROM NOON TODAY TO 8 PM CDT FRIDAY...

.TODAY...Sunny, hot with highs in the upper 90s. Southwest winds
5 to 10 mph.
.TONIGHT...Clear. Lows in the mid 70s. South winds 5 to 10 mph.
Heat index values up to 101 early in the evening.
.TUESDAY...Sunny, hot with highs in the upper 90s. Southwest
winds around 5 mph.
.TUESDAY NIGHT...Clear. Lows in the upper 70s. South winds around
5 mph. Heat index values up to 104 early in the evening.
.WEDNESDAY...Sunny, hot with highs in the upper 90s. Southwest
winds 5 to 10 mph.
.WEDNESDAY NIGHT THROUGH THURSDAY NIGHT...Mostly clear. Hot. Lows
in the upper 70s. Highs in the upper 90s. Heat index values up to
105.
.FRIDAY...Sunny. A slight chance of showers and thunderstorms in
the afternoon. Highs in the mid 90s. Chance of rain 20 percent.
Heat index values up to 100.
.FRIDAY NIGHT...Mostly clear. Lows in the mid 70s.
.SATURDAY...Sunny with a slight chance of showers. A slight
chance of thunderstorms in the afternoon. Highs in the lower 90s.
Chance of rain 20 percent.
.SATURDAY NIGHT AND SUNDAY...Mostly clear. Lows in the lower 70s.
Highs in the lower 90s.

$$

MOZ042-049-050-311800-
Audrain MO-Osage MO-Callaway MO-
Including the cities of Mexico and Fulton
523 AM CDT Mon Aug 31 2026

...HEAT ADVISORY IN EFFECT FROM NOON TODAY TO 8 PM CDT FRIDAY...

.TODAY...Sunny, hot with highs in the upper 90s. Southwest winds
5 to 10 mph with gusts up to 20 mph.
.TONIGHT...Mostly clear. Lows in the mid 70s. South winds around
5 mph. Heat index values up to 100 early in the evening.
.TUESDAY...Sunny, hot with highs in the upper 90s. Southwest
winds 5 to 10 mph.
.TUESDAY NIGHT...Mostly clear. Lows in the mid 70s. South winds
around 5 mph. Heat index values up to 100 early in the evening.
.WEDNESDAY...Sunny, hot with highs in the upper 90s. Southwest
winds 5 to 10 mph.
.WEDNESDAY NIGHT THROUGH FRIDAY NIGHT...Mostly clear. Lows in the
mid 70s. Highs in the mid 90s. Heat index values up to 105.
.SATURDAY...Sunny. A slight chance of showers and thunderstorms
in the afternoon. Highs in the lower 90s. Chance of rain
20 percent.
.SATURDAY NIGHT...Mostly clear. Lows around 70.
.SUNDAY...Mostly sunny. Highs around 90.

$$

MOZ041-047-048-311800-
Boone MO-Moniteau MO-Cole MO-
Including the cities of Columbia and Jefferson City
523 AM CDT Mon Aug 31 2026

...HEAT ADVISORY IN EFFECT FROM NOON TODAY TO 8 PM CDT FRIDAY...

.TODAY...Sunny, hot with highs in the upper 90s. Southwest winds
5 to 10 mph with gusts up to 20 mph.
.TONIGHT...Mostly clear. Lows in the mid 70s. South winds around
5 mph. Heat index values up to 101 early in the evening.
.TUESDAY...Sunny, hot with highs in the upper 90s. Southwest
winds around 5 mph.
.TUESDAY NIGHT...Mostly clear. Lows in the upper 70s. South winds
around 5 mph. Heat index values up to 101 early in the evening.
.WEDNESDAY...Sunny, hot with highs in the upper 90s. Southwest
winds 5 to 10 mph.
.WEDNESDAY NIGHT THROUGH THURSDAY NIGHT...Mostly clear. Hot. Lows
in the upper 70s. Highs in the upper 90s. Heat index values up to
105.
.FRIDAY AND FRIDAY NIGHT...Mostly clear. Highs in the lower 90s.
Lows in the mid 70s. Heat index values up to 100.
.SATURDAY...Sunny. A slight chance of showers and thunderstorms
in the afternoon. Highs in the lower 90s. Chance of rain
20 percent.
.SATURDAY NIGHT...Mostly clear. Lows in the lower 70s.
.SUNDAY...Mostly sunny. A slight chance of showers and
thunderstorms in the afternoon. Highs in the lower 90s. Chance of
rain 20 percent.

$$

ILZ095>097-MOZ018-019-026-027-034>036-311800-
Adams IL-Brown IL-Pike IL-Knox MO-Lewis MO-Shelby MO-Marion MO-
Monroe MO-Ralls MO-Pike MO-
Including the cities of Quincy, Mount Sterling, Pittsfield,
Hannibal, and Bowling Green
523 AM CDT Mon Aug 31 2026

...HEAT ADVISORY IN EFFECT FROM NOON TODAY TO 8 PM CDT FRIDAY...

.TODAY...Sunny, hot with highs in the mid 90s. Southwest winds
10 to 15 mph with gusts up to 25 mph.
.TONIGHT...Mostly clear. Lows in the mid 70s. South winds 5 to
10 mph. Heat index values up to 101 early in the evening.
.TUESDAY...Sunny, hot with highs in the upper 90s. Southwest
winds 5 to 10 mph.
.TUESDAY NIGHT...Mostly clear. Lows in the upper 70s. South winds
around 5 mph. Heat index values up to 100 early in the evening.
.WEDNESDAY...Sunny, hot with highs in the upper 90s. Southwest
winds 5 to 10 mph with gusts up to 20 mph. Heat index values up
to 105.
.WEDNESDAY NIGHT THROUGH THURSDAY NIGHT...Mostly clear. Hot. Lows
in the mid 70s. Highs in the mid 90s. Heat index values up to
105.
.FRIDAY AND FRIDAY NIGHT...Mostly clear. A slight chance of
showers and thunderstorms. Highs in the lower 90s. Lows in the
lower 70s. Chance of rain 20 percent.
.SATURDAY...Mostly sunny with a slight chance of showers. A
slight chance of thunderstorms in the afternoon. Highs in the
lower 90s. Chance of rain 20 percent.
.SATURDAY NIGHT...Partly cloudy. Lows around 70.
.SUNDAY...Mostly sunny with a 20 percent chance of showers. Highs
in the upper 80s.

$$

ILZ069-070-074-311800-
Clinton IL-Marion IL-Washington IL-
Including the cities of Centralia and Salem
523 AM CDT Mon Aug 31 2026

...HEAT ADVISORY IN EFFECT FROM NOON TODAY TO 8 PM CDT FRIDAY...

.TODAY...Sunny, hot with highs in the mid 90s. Southwest winds
5 to 10 mph.
.TONIGHT...Clear. Lows in the mid 70s. South winds around 5 mph.
.TUESDAY...Sunny, hot with highs in the upper 90s. Southwest
winds around 5 mph. Heat index values up to 105.
.TUESDAY NIGHT...Clear. Lows in the mid 70s. South winds around
5 mph. Heat index values up to 103 early in the evening.
.WEDNESDAY...Sunny, hot with highs in the upper 90s. Southwest
winds around 5 mph. Heat index values up to 105.
.WEDNESDAY NIGHT...Clear. Lows in the upper 70s. Heat index
values up to 100 early in the evening.
.THURSDAY AND THURSDAY NIGHT...Mostly clear. Hot. Highs in the
upper 90s. Lows in the mid 70s. Heat index values up to 105.
.FRIDAY...Sunny. A slight chance of showers and thunderstorms in
the afternoon. Highs in the lower 90s. Chance of rain 20 percent.
Heat index values up to 100.
.FRIDAY NIGHT...Mostly clear. Lows in the lower 70s.
.SATURDAY...Sunny with a slight chance of showers and
thunderstorms. Highs in the lower 90s. Chance of rain 20 percent.
.SATURDAY NIGHT AND SUNDAY...Mostly clear. Lows in the lower 70s.
Highs around 90.

$$

MOZ074-084-085-099-311800-
Saint Francois MO-Iron MO-Madison MO-Reynolds MO-
Including the city of Farmington
523 AM CDT Mon Aug 31 2026

...HEAT ADVISORY IN EFFECT FROM NOON TODAY TO 8 PM CDT FRIDAY...

.TODAY...Sunny. Highs in the mid 90s. South winds 5 to 10 mph.
.TONIGHT...Clear. Lows in the lower 70s. South winds around
5 mph.
.TUESDAY...Sunny, hot with highs in the mid 90s. Southwest winds
around 5 mph.
.TUESDAY NIGHT...Clear. Lows in the lower 70s. South winds around
5 mph.
.WEDNESDAY...Sunny, hot with highs in the mid 90s. Southwest
winds around 5 mph.
.WEDNESDAY NIGHT...Clear. Lows in the lower 70s.
.THURSDAY AND THURSDAY NIGHT...Mostly clear. Hot. Highs in the
mid 90s. Lows in the lower 70s. Heat index values up to 105.
.FRIDAY...Sunny. A slight chance of showers and thunderstorms in
the afternoon. Highs in the lower 90s. Chance of rain 20 percent.
Heat index values up to 100.
.FRIDAY NIGHT...Partly cloudy in the evening, then becoming
mostly clear. Lows in the lower 70s.
.SATURDAY...Sunny. A slight chance of showers and thunderstorms
in the afternoon. Highs in the lower 90s. Chance of rain
20 percent.
.SATURDAY NIGHT AND SUNDAY...Mostly clear. Lows in the upper 60s.
Highs around 90.

$$

MOZ051-052-060-311800-
Montgomery MO-Lincoln MO-Warren MO-
523 AM CDT Mon Aug 31 2026

...HEAT ADVISORY IN EFFECT FROM NOON TODAY TO 8 PM CDT FRIDAY...

.TODAY...Sunny, hot with highs in the upper 90s. Southwest winds
5 to 10 mph with gusts up to 20 mph.
.TONIGHT...Mostly clear. Lows in the mid 70s. South winds around
5 mph. Heat index values up to 101 early in the evening.
.TUESDAY...Sunny, hot with highs in the upper 90s. Southwest
winds around 5 mph.
.TUESDAY NIGHT...Clear. Lows in the mid 70s. South winds around
5 mph. Heat index values up to 101 early in the evening.
.WEDNESDAY...Sunny, hot with highs in the upper 90s. Southwest
winds around 5 mph.
.WEDNESDAY NIGHT THROUGH THURSDAY NIGHT...Mostly clear. Hot. Lows
in the mid 70s. Highs in the mid 90s. Heat index values up to
105.
.FRIDAY...Sunny. A slight chance of showers and thunderstorms in
the afternoon. Highs in the lower 90s. Chance of rain 20 percent.
Heat index values up to 100.
.FRIDAY NIGHT...Mostly clear. Lows in the lower 70s.
.SATURDAY...Sunny with a slight chance of showers. A slight
chance of thunderstorms in the afternoon. Highs in the lower 90s.
Chance of rain 20 percent.
.SATURDAY NIGHT...Mostly clear. Lows around 70.
.SUNDAY...Mostly sunny. Highs around 90.

$$

ILZ058-059-098-099-311800-
Greene IL-Macoupin IL-Calhoun IL-Jersey IL-
523 AM CDT Mon Aug 31 2026

...HEAT ADVISORY IN EFFECT FROM NOON TODAY TO 8 PM CDT FRIDAY...

.TODAY...Sunny, hot with highs in the upper 90s. Southwest winds
5 to 10 mph.
.TONIGHT...Mostly clear. Lows in the mid 70s. South winds 5 to
10 mph. Heat index values up to 100 early in the evening.
.TUESDAY...Sunny, hot with highs in the upper 90s. Southwest
winds 5 to 10 mph.
.TUESDAY NIGHT...Clear. Lows in the mid 70s. South winds around
5 mph. Heat index values up to 102 early in the evening.
.WEDNESDAY...Sunny, hot with highs in the upper 90s. Southwest
winds 5 to 10 mph.
.WEDNESDAY NIGHT THROUGH THURSDAY NIGHT...Mostly clear. Hot. Lows
in the mid 70s. Highs in the upper 90s. Heat index values up to
105.
.FRIDAY THROUGH SATURDAY...Mostly clear with a slight chance of
showers and thunderstorms. Highs in the lower 90s. Lows in the
lower 70s. Chance of rain 20 percent.
.SATURDAY NIGHT AND SUNDAY...Mostly clear. Lows around 70. Highs
around 90.

$$

ILZ060-064-065-311800-
Montgomery IL-Bond IL-Fayette IL-
Including the cities of Litchfield and Vandalia
523 AM CDT Mon Aug 31 2026

...HEAT ADVISORY IN EFFECT FROM NOON TODAY TO 8 PM CDT FRIDAY...

.TODAY...Sunny, hot with highs in the mid 90s. Southwest winds
5 to 10 mph.
.TONIGHT...Mostly clear. Not as cool with lows in the mid 70s.
South winds around 5 mph.
.TUESDAY...Sunny, hot with highs in the upper 90s. Southwest
winds 5 to 10 mph. Heat index values up to 104.
.TUESDAY NIGHT...Clear. Lows in the mid 70s. South winds around
5 mph. Heat index values up to 101 early in the evening.
.WEDNESDAY...Sunny, hot with highs in the upper 90s. Southwest
winds 5 to 10 mph. Heat index values up to 104.
.WEDNESDAY NIGHT...Clear. Lows in the upper 70s. Heat index
values up to 100 early in the evening.
.THURSDAY AND THURSDAY NIGHT...Mostly clear. Hot. Highs in the
upper 90s. Lows in the mid 70s. Heat index values up to 105.
.FRIDAY THROUGH SATURDAY...Mostly clear with a slight chance of
showers and thunderstorms. Highs in the lower 90s. Lows in the
lower 70s. Chance of rain 20 percent.
.SATURDAY NIGHT AND SUNDAY...Mostly clear. Lows in the upper 60s.
Highs in the upper 80s.

$$

ILZ079-MOZ075-311800-
Randolph IL-Sainte Genevieve MO-
Including the cities of Chester and Sparta
523 AM CDT Mon Aug 31 2026

...HEAT ADVISORY IN EFFECT FROM NOON TODAY TO 8 PM CDT FRIDAY...

.TODAY...Sunny, hot with highs in the mid 90s. South winds 5 to
10 mph.
.TONIGHT...Clear. Lows in the lower 70s. South winds around
5 mph.
.TUESDAY...Sunny, hot with highs in the upper 90s. Southwest
winds around 5 mph. Heat index values up to 104.
.TUESDAY NIGHT...Clear. Lows in the lower 70s. South winds around
5 mph. Heat index values up to 103 early in the evening.
.WEDNESDAY...Sunny, hot with highs in the mid 90s. Southwest
winds around 5 mph. Heat index values up to 105.
.WEDNESDAY NIGHT...Clear. Lows in the mid 70s. Heat index values
up to 100 early in the evening.
.THURSDAY AND THURSDAY NIGHT...Mostly clear. Hot. Highs in the
mid 90s. Lows in the mid 70s. Heat index values up to 105.
.FRIDAY...Sunny. A slight chance of showers and thunderstorms in
the afternoon. Highs in the lower 90s. Chance of rain 20 percent.
Heat index values up to 100.
.FRIDAY NIGHT...Mostly clear. Lows in the lower 70s.
.SATURDAY...Sunny. A slight chance of showers and thunderstorms
in the afternoon. Highs in the lower 90s. Chance of rain
20 percent. Heat index values up to 100.
.SATURDAY NIGHT AND SUNDAY...Mostly clear. Lows around 70. Highs
around 90.

$$

MOZ059-062-072-073-311800-
Gasconade MO-Franklin MO-Crawford MO-Washington MO-
Including the cities of Washington, Union, and Sullivan
523 AM CDT Mon Aug 31 2026

...HEAT ADVISORY IN EFFECT FROM NOON TODAY TO 8 PM CDT FRIDAY...

.TODAY...Sunny, hot with highs in the upper 90s. Southwest winds
5 to 10 mph.
.TONIGHT...Clear. Lows in the lower 70s. South winds around
5 mph.
.TUESDAY...Sunny, hot with highs in the upper 90s. Southwest
winds around 5 mph.
.TUESDAY NIGHT...Clear. Lows in the mid 70s. South winds around
5 mph. Heat index values up to 100 early in the evening.
.WEDNESDAY...Sunny, hot with highs in the mid 90s. Southwest
winds around 5 mph. Heat index values up to 103.
.WEDNESDAY NIGHT THROUGH THURSDAY NIGHT...Mostly clear. Hot. Lows
in the mid 70s. Highs in the mid 90s. Heat index values up to
105.
.FRIDAY...Sunny. A slight chance of showers and thunderstorms in
the afternoon. Highs in the lower 90s. Chance of rain 20 percent.
Heat index values up to 100.
.FRIDAY NIGHT...Mostly clear. Lows in the lower 70s.
.SATURDAY...Sunny. A slight chance of showers and thunderstorms
in the afternoon. Highs in the lower 90s. Chance of rain
20 percent.
.SATURDAY NIGHT AND SUNDAY...Mostly clear. Lows in the upper 60s.
Highs around 90.

$$

ILZ102-MOZ065-311800-
Monroe IL-Jefferson MO-
523 AM CDT Mon Aug 31 2026

...HEAT ADVISORY IN EFFECT FROM NOON TODAY TO 8 PM CDT FRIDAY...

.TODAY...Sunny, hot with highs in the upper 90s. Southwest winds
5 to 10 mph.
.TONIGHT...Clear. Lows in the mid 70s. South winds around 5 mph.
Heat index values up to 100 early in the evening.
.TUESDAY...Sunny, hot with highs in the upper 90s. Southwest
winds around 5 mph. Heat index values up to 105.
.TUESDAY NIGHT...Mostly clear. Lows in the mid 70s. South winds
around 5 mph. Heat index values up to 103 early in the evening.
.WEDNESDAY...Sunny, hot with highs in the upper 90s. Southwest
winds around 5 mph. Heat index values up to 105.
.WEDNESDAY NIGHT THROUGH THURSDAY NIGHT...Mostly clear. Hot. Lows
in the mid 70s. Highs in the upper 90s. Heat index values up to
110.
.FRIDAY...Sunny. A slight chance of showers and thunderstorms in
the afternoon. Highs in the lower 90s. Chance of rain 20 percent.
Heat index values up to 100.
.FRIDAY NIGHT...Mostly clear. Lows in the lower 70s.
.SATURDAY...Sunny. A slight chance of showers and thunderstorms
in the afternoon. Highs in the lower 90s. Chance of rain
20 percent. Heat index values up to 100.
.SATURDAY NIGHT AND SUNDAY...Mostly clear. Lows around 70. Highs
in the lower 90s.

$$