Caseyville climate

Caseyville Weather in May

NOAA 1991-2020 normals for Cahokia, 16.6 km from Caseyville

Average highs run from 72°F on May 1 to 80°F on May 31, and lows from 51°F to 61°F. Normal precipitation for the month is 4.80 in over about 12 wet days.

May day by day

The normal high and low for each date, and the record, in °F.

Normal daily high and low temperature at Caseyville, in °F, with the record for each date.20406080100151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

May at a glance

Average high
76°F
Average low
56°F
Precipitation
4.80 in
Record high
95°FMay 26, 2012
Record low
33°FMay 4, 2011
Chance of a freeze
0%
Days of 90°F or more
1.4
Daylight
13 h 49 min to 14 h 40 min
Cloud cover
63%
Humidity
78%
Dew point
58°F
Wind
8.1 mph

Every day of the month

A wet day has at least 0.01 inch of precipitation; snow means at least 0.1 inch of snowfall.

DateNormal highNormal lowRecord highRecord lowChance wetChance of snow
May 172°F51°F87°F 201836°F 201542%0%
May 273°F52°F89°F 201240°F 200542%0%
May 373°F52°F87°F 200135°F 200542%0%
May 473°F52°F86°F 200133°F 201142%0%
May 573°F53°F91°F 201241°F 201142%0%
May 674°F53°F91°F 201243°F 202542%0%
May 774°F53°F92°F 202339°F 202641%0%
May 874°F54°F87°F 201439°F 202041%0%
May 974°F54°F88°F 200334°F 202041%0%
May 1074°F54°F90°F 201835°F 202141%0%
May 1175°F55°F94°F 202237°F 202141%0%
May 1275°F55°F94°F 202239°F 200841%0%
May 1375°F55°F91°F 201836°F 202140%0%
May 1475°F56°F92°F 201337°F 202140%0%
May 1576°F56°F91°F 201342°F 201640%0%
May 1676°F56°F92°F 200139°F 200540%0%
May 1776°F56°F89°F 202637°F 201440%0%
May 1877°F57°F90°F 201737°F 200239%0%
May 1977°F57°F94°F 199842°F 200239%0%
May 2077°F57°F91°F 201240°F 200239%0%
May 2177°F58°F90°F 202442°F 200239%0%
May 2278°F58°F88°F 200944°F 200238%0%
May 2378°F58°F89°F 201043°F 200338%0%
May 2478°F59°F92°F 201243°F 201338%0%
May 2579°F59°F94°F 200646°F 199938%0%
May 2679°F59°F95°F 201247°F 199938%0%
May 2779°F59°F95°F 201843°F 199938%0%
May 2879°F60°F95°F 201249°F 199938%0%
May 2980°F60°F92°F 200645°F 202137%0%
May 3080°F60°F90°F 201141°F 202137%0%
May 3180°F61°F94°F 199850°F 202137%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Caseyville, in percent, and of at least 0.1 inch of snowfall.010203040501102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (CDT).

May 1
sunrise 6:03 AM, sunset 7:52 PM
May 31
sunrise 5:38 AM, sunset 8:18 PM

Every day of May: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00111160 (Cahokia), public domain. Records: NOAA GHCN-Daily, station USW00003960, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.