Starr County climate

Starr County Weather in May

NOAA 1991-2020 normals for Rio Grande City, 21.9 km from Starr County

Average highs run from 91°F on May 1 to 97°F on May 31, and lows from 66°F to 73°F. Normal precipitation for the month is 2.85 in over about 5 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 Starr County, in °F, with the record for each date.406080100120151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

May at a glance

Average high
94°F
Average low
70°F
Precipitation
2.85 in
Record high
112°FMay 9, 2024
Record low
48°FMay 3, 2004
Chance of a freeze
0%
Days of 90°F or more
24.5
Daylight
13 h 10 min to 13 h 42 min
Cloud cover
53%
Humidity
62%
Dew point
66°F
Wind
12.8 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 191°F66°F97°F 200654°F 201712%0%
May 291°F67°F96°F 200654°F 200412%0%
May 392°F67°F100°F 202148°F 200412%0%
May 492°F67°F98°F 202051°F 200412%0%
May 592°F67°F100°F 202053°F 201112%0%
May 692°F68°F99°F 202656°F 201613%0%
May 792°F68°F97°F 202458°F 202113%0%
May 892°F68°F103°F 202458°F 201813%0%
May 992°F68°F112°F 202463°F 202013%0%
May 1093°F69°F107°F 200663°F 202013%0%
May 1193°F69°F96°F 200959°F 202513%0%
May 1293°F69°F101°F 201760°F 200613%0%
May 1393°F69°F102°F 202461°F 200713%0%
May 1493°F70°F98°F 202559°F 201413%0%
May 1594°F70°F101°F 202553°F 201414%0%
May 1694°F70°F99°F 202551°F 201414%0%
May 1794°F70°F98°F 201859°F 201414%0%
May 1894°F71°F101°F 202462°F 200914%0%
May 1994°F71°F103°F 202454°F 200914%0%
May 2095°F71°F102°F 202459°F 202114%0%
May 2195°F71°F101°F 202458°F 200914%0%
May 2295°F71°F101°F 202463°F 201214%0%
May 2395°F72°F101°F 200866°F 200914%0%
May 2495°F72°F102°F 202463°F 201714%0%
May 2596°F72°F103°F 202464°F 201714%0%
May 2696°F72°F102°F 202465°F 200714%0%
May 2796°F72°F101°F 201866°F 200714%0%
May 2896°F73°F104°F 202465°F 201014%0%
May 2996°F73°F101°F 200566°F 201514%0%
May 3097°F73°F100°F 200466°F 200514%0%
May 3197°F73°F100°F 200468°F 200914%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Starr County, in percent, and of at least 0.1 inch of snowfall.0510151102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (CDT).

May 1
sunrise 6:57 AM, sunset 8:07 PM
May 31
sunrise 6:42 AM, sunset 8:24 PM

Every day of May: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00417622 (Rio Grande City), public domain. Records: NOAA GHCN-Daily, station USW00012987, 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.