Willacy County climate

Willacy County Weather in September

NOAA 1991-2020 normals for Port Mansfield, 18.8 km from Willacy County

Average highs run from 91°F on September 1 to 87°F on September 30, and lows from 76°F to 71°F. Normal precipitation for the month is 5.37 in over about 9 wet days.

September day by day

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

Normal daily high and low temperature at Willacy County, in °F, with the record for each date.406080100120151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

September at a glance

Average high
89°F
Average low
74°F
Precipitation
5.37 in
Record high
107°FSep 4, 2011
Record low
53°FSep 27, 2000
Chance of a freeze
0%
Days of 90°F or more
10.1
Daylight
12 h 40 min to 11 h 56 min
Cloud cover
51%
Humidity
75%
Dew point
73°F
Wind
9.6 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
Sep 191°F76°F103°F 202672°F 199721%0%
Sep 290°F76°F104°F 202669°F 200622%0%
Sep 390°F76°F106°F 201171°F 195422%0%
Sep 490°F75°F107°F 201172°F 200623%0%
Sep 590°F75°F107°F 200067°F 195223%0%
Sep 690°F75°F103°F 200065°F 201124%0%
Sep 790°F75°F102°F 202662°F 201124%0%
Sep 890°F75°F103°F 202361°F 201125%0%
Sep 989°F75°F102°F 202364°F 201125%0%
Sep 1089°F74°F104°F 202664°F 201725%0%
Sep 1189°F74°F103°F 202665°F 201725%0%
Sep 1289°F74°F102°F 202664°F 201726%0%
Sep 1389°F74°F102°F 202665°F 196026%0%
Sep 1489°F74°F101°F 202368°F 195926%0%
Sep 1589°F74°F102°F 202667°F 196026%0%
Sep 1688°F74°F102°F 200065°F 200826%0%
Sep 1788°F73°F100°F 202662°F 200826%0%
Sep 1888°F73°F100°F 201165°F 196126%0%
Sep 1988°F73°F99°F 201765°F 199926%0%
Sep 2088°F73°F98°F 201765°F 199926%0%
Sep 2188°F73°F98°F 201161°F 201226%0%
Sep 2288°F73°F99°F 202363°F 199926%0%
Sep 2388°F73°F101°F 200559°F 199925%0%
Sep 2487°F72°F103°F 200560°F 202125%0%
Sep 2587°F72°F102°F 201163°F 200025%0%
Sep 2687°F72°F100°F 201158°F 200024%0%
Sep 2787°F72°F100°F 200553°F 200024%0%
Sep 2887°F72°F102°F 200557°F 200024%0%
Sep 2987°F72°F98°F 200558°F 200024%0%
Sep 3087°F71°F97°F 200557°F 200023%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Willacy County, in percent, and of at least 0.1 inch of snowfall.01020301102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (CDT).

September 1
sunrise 7:10 AM, sunset 7:50 PM
September 30
sunrise 7:22 AM, sunset 7:18 PM

Every day of September: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00417184 (Port Mansfield), public domain. Records: NOAA GHCN-Daily, station USW00012904, 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.