817
CDUS43 KLSX 212135
CLISTL
CLIMATE REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
435 PM CDT SUN SEP 21 2025
...............................
..THE ST. LOUIS CLIMATE SUMMARY FOR SEPTEMBER 21 2025
VALID TODAY AS OF 0400 PM LOCAL TIME.
CLIMATE NORMAL PERIOD 1991 TO 2020
CLIMATE RECORD PERIOD 1874 TO 2025
WEATHER ITEM OBSERVED TIME RECORD YEAR NORMAL DEPARTURE LAST
VALUE (LST) VALUE VALUE FROM YEAR
NORMAL
...............................................................
TEMPERATURE (F)
TODAY
MAXIMUM 87 259 PM 97 1881 79 8 94
MINIMUM 67 630 AM 40 1983 59 8 75
AVERAGE 77 69 8 85
PRECIPITATION (IN)
TODAY 0.00 1.78 1947 0.10 -0.10 0.00
MONTH TO DATE 0.23 2.14 -1.91 0.08
SINCE SEP 1 0.23 2.14 -1.91 0.08
SINCE JAN 1 32.32 31.81 0.51 31.76
SNOWFALL (IN)
TODAY MM 0.0 2015 0.0 MM 0.0
MONTH TO DATE 0.0 0.0 0.0 0.0
SINCE SEP 1 0.0 0.0 0.0 0.0
SINCE JUL 1 0.0 0.0 0.0 0.0
SNOW DEPTH MM
DEGREE DAYS
HEATING
TODAY 0 1 -1 0
MONTH TO DATE 4 9 -5 3
SINCE SEP 1 4 9 -5 3
SINCE JUL 1 4 10 -6 3
COOLING
TODAY 12 6 6 20
MONTH TO DATE 203 173 30 213
SINCE SEP 1 203 173 30 213
SINCE JAN 1 1724 1623 101 1921
...............................................................
WIND (MPH)
HIGHEST WIND SPEED 13 HIGHEST WIND DIRECTION SW (210)
HIGHEST GUST SPEED 22 HIGHEST GUST DIRECTION SW (220)
AVERAGE WIND SPEED 5.3
SKY COVER
AVERAGE SKY COVER 0.5
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED TODAY.
NO SIGNIFICANT WEATHER WAS OBSERVED.
RELATIVE HUMIDITY (PERCENT)
HIGHEST 87 100 AM
LOWEST 43 300 PM
AVERAGE 65
......................................................
THE ST. LOUIS CLIMATE NORMALS FOR TOMORROW
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 79 95 1956
2017
MINIMUM TEMPERATURE (F) 59 40 1974
1995
SUNRISE AND SUNSET
SEPTEMBER 21 2025.....SUNRISE 649 AM CDT SUNSET 700 PM CDT
SEPTEMBER 22 2025.....SUNRISE 650 AM CDT SUNSET 658 PM CDT
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
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