Cameron County climate

Cameron County Weather in September

NOAA 1991-2020 normals for Port Isabel Cameron AP, 10.8 km from Cameron County

Average highs run from 92°F on September 1 to 89°F on September 30, and lows from 76°F to 73°F. Normal precipitation for the month is 5.26 in over about 10 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 Cameron County, in °F, with the record for each date.5060708090100110151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

September at a glance

Average high
90°F
Average low
75°F
Precipitation
5.26 in
Record high
101°FSep 3, 2000
Record low
57°FSep 27, 2000
Chance of a freeze
0%
Days of 90°F or more
17.9
Daylight
12 h 39 min to 11 h 55 min
Cloud cover
51%
Humidity
74%
Dew point
73°F
Wind
8.9 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 192°F76°F99°F 200074°F 200126%0%
Sep 292°F76°F99°F 201873°F 200626%0%
Sep 392°F76°F101°F 200072°F 200427%0%
Sep 492°F76°F101°F 201173°F 200027%0%
Sep 592°F76°F100°F 200073°F 200028%0%
Sep 692°F76°F98°F 200071°F 201128%0%
Sep 792°F76°F97°F 201266°F 201129%0%
Sep 891°F76°F100°F 200266°F 201129%0%
Sep 991°F76°F96°F 201669°F 201130%0%
Sep 1091°F76°F100°F 202667°F 201130%0%
Sep 1191°F76°F100°F 202668°F 201730%0%
Sep 1291°F76°F97°F 202665°F 201731%0%
Sep 1391°F75°F96°F 201169°F 201731%0%
Sep 1491°F75°F99°F 202372°F 200931%0%
Sep 1591°F75°F98°F 202373°F 200031%0%
Sep 1690°F75°F95°F 200667°F 200831%0%
Sep 1790°F75°F97°F 201666°F 200831%0%
Sep 1890°F75°F97°F 201167°F 200831%0%
Sep 1990°F75°F95°F 201769°F 200031%0%
Sep 2090°F75°F95°F 201769°F 200231%0%
Sep 2190°F74°F95°F 201767°F 200231%0%
Sep 2290°F74°F98°F 202366°F 202131%0%
Sep 2389°F74°F98°F 200565°F 202130%0%
Sep 2489°F74°F100°F 200563°F 199930%0%
Sep 2589°F74°F100°F 201166°F 200130%0%
Sep 2689°F74°F98°F 201160°F 200030%0%
Sep 2789°F73°F98°F 201157°F 200030%0%
Sep 2889°F73°F98°F 200562°F 200029%0%
Sep 2989°F73°F94°F 201261°F 200029%0%
Sep 3089°F73°F93°F 202362°F 200029%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Cameron County, in percent, and of at least 0.1 inch of snowfall.0102030401102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (CDT).

September 1
sunrise 7:10 AM, sunset 7:49 PM
September 30
sunrise 7:22 AM, sunset 7:17 PM

Every day of September: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USW00012957 (Port Isabel Cameron AP), public domain. Records: NOAA GHCN-Daily, station USW00012957, 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.