Sinton, Texas climate: Normal weather by month, frost dates and records
Sinton's normal year runs from 45°F January nights to 95°F August afternoons, with 33.0 inches of precipitation and less than an inch of snow (0.4 in) a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 21.9°C, January lows of 7°C, August highs of 35°C, 837 mm of precipitation a year.
- NOAA stationSinton
- Station IDUSC00418354
- Location28.04°N 97.54°W
- Elevation48 ft (15 m)
- Population5,648
On October 22, the normal high in Sinton is 83°F and the normal low 61°F, and the chance of measurable rain or snow is 15%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Sinton.
- Jan 66° 45°
- Feb 70° 49°
- Mar 75° 56°
- Apr 81° 62°
- May 86° 69°
- Jun 91° 74°
- Jul 93° 76°
- Aug 95° 76°
- Sep 90° 71°
- Oct 85° 63°
- Nov 75° 54°
- Dec 68° 47°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like in Sinton each month?
August is the warmest month, with normal highs of 95°F; January the coldest, with normal lows of 45°F. The most precipitation falls in September (5.28 in), the least in January (1.65 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 66°F | 45°F | 55.7°F | 1.65 | 5 | <1 | 3 | 10 h 30 min |
| February | 70°F | 49°F | 59.8°F | 1.85 | 5 | <1 | 1 | 11 h 10 min |
| March | 75°F | 56°F | 65.4°F | 2.44 | 5 | 1 | <1 | 12 h |
| April | 81°F | 62°F | 71.2°F | 1.83 | 4 | 2 | <1 | 12 h 50 min |
| May | 86°F | 69°F | 77.6°F | 3.26 | 5 | 7 | <1 | 13 h 30 min |
| June | 91°F | 74°F | 82.7°F | 3.41 | 4 | 22 | <1 | 13 h 50 min |
| July | 93°F | 76°F | 84.4°F | 2.80 | 4 | 26 | <1 | 13 h 50 min |
| August | 95°F | 76°F | 85.2°F | 2.47 | 5 | 29 | <1 | 13 h 10 min |
| September | 90°F | 71°F | 80.9°F | 5.28 | 8 | 20 | <1 | 12 h 20 min |
| October | 85°F | 63°F | 73.7°F | 3.86 | 5 | 6 | <1 | 11 h 30 min |
| November | 75°F | 54°F | 64.5°F | 2.41 | 4 | <1 | <1 | 10 h 50 min |
| December | 68°F | 47°F | 57.4°F | 1.70 | 5 | <1 | 2 | 10 h 20 min |
| Year (annual) | 81°F | 62°F | 71.5°F | 32.96 | 57 | 113 | 7 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 19°C | 7°C | 13.2°C | 42 mm |
| February | 21°C | 10°C | 15.4°C | 47 mm |
| March | 24°C | 13°C | 18.6°C | 62 mm |
| April | 27°C | 16°C | 21.8°C | 46 mm |
| May | 30°C | 21°C | 25.3°C | 83 mm |
| June | 33°C | 24°C | 28.2°C | 87 mm |
| July | 34°C | 24°C | 29.1°C | 71 mm |
| August | 35°C | 24°C | 29.6°C | 63 mm |
| September | 32°C | 22°C | 27.2°C | 134 mm |
| October | 29°C | 17°C | 23.2°C | 98 mm |
| November | 24°C | 12°C | 18.1°C | 61 mm |
| December | 20°C | 8°C | 14.1°C | 43 mm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00418354; annual normals. Wet days: 0.01 inch or more; 90°F days and freezing nights: NOAA's day counts. Daylight: sunrise to sunset on the 15th, computed from the latitude.
When is the best weather to visit Sinton?
Normal highs sit between 65°F and 85°F in January, February, March, April, October, November and December. Of those, April has the fewest days with rain (4).
That is a measurement, not a recommendation: it counts the months whose normal afternoon high sits between 65°F and 85°F, where a light layer is enough by day.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00418354.
When is the last frost in Sinton?
In Sinton, the last spring frost (32°F) comes after February 1 in half of years and after March 6 in one year in ten; the first autumn frost comes before December 17 in half of years and before November 22 in one year in ten. A night at 32°F or colder comes at all in 93% of years here (NOAA).
Frost-free in half of yearsFrost in 1 to 9 years out of 10Frost most years
- Last spring frost, half of years after
- February 11 year in 10 after March 6; 9 in 10 after December 27
- First autumn frost, half of years before
- December 171 year in 10 before November 22; 9 in 10 before January 17
NOAA puts the median frost-free season at 324 days, and the season without a hard freeze (28°F) at 361 days.
A hard freeze (28°F) comes after January 12 in half of springs and before January 1 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Sinton in zone 9b in ZIP code 78387, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Sinton's NOAA station is in zone 9b: the coldest night of a typical year reaches 27°F (15 complete years).
Frost dates for every NOAA station in Texas · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00418354; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026; the station zone: ACIS daily lows, 1991-2020. A 10% date means one year in ten has a frost after it in spring or before it in autumn.
How hot and how cold does it get in Sinton?
In a normal year in Sinton, 113 days a year reach 90°F (3 of them 100°F or more), 7 nights fall to 32°F or colder and 57 days bring measurable precipitation.
- Days at 90°F or more
- 113a normal year
- Days at 100°F or more
- 3a normal year
- Nights at 32°F or colder
- 7a normal year
- Days that stay below freezing
- fewer than 1high of 32°F or less
- Days with 0.01 inch of precipitation
- 57a normal year
The highest temperature in this station's record (since 1958) is 109°F, on September 6, 2000; the lowest is 10°F, on December 23, 1989.
The wettest calendar year on that record is 1997, with 50.39 in; the snowiest season is 1925–26, with 6.0 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00418354; records: ACIS (NOAA Regional Climate Centers), station USC00418354. Records use complete months only; a month missing more than three days is left out.
How sunny is Sinton?
Over a year 79% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Sinton, 4.8 kWh per square metre a day. August is the sunniest month (87%) and February the cloudiest (68%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 70% | 3.0 |
| February | 68% | 3.5 |
| March | 71% | 4.5 |
| April | 74% | 5.3 |
| May | 79% | 6.0 |
| June | 85% | 6.7 |
| July | 86% | 6.6 |
| August | 87% | 6.3 |
| September | 81% | 5.2 |
| October | 83% | 4.5 |
| November | 77% | 3.4 |
| December | 70% | 2.8 |
Source: NASA POWER solar climatology, 2001-2020 (CERES SYN1deg). Satellite-based, for the 1-degree cell (about 100 km across) around the station, so it describes the area rather than the airport.
How much heating and cooling does Sinton need?
A normal year in Sinton brings 1,011 heating degree days, 81% fewer than the median U.S. place (5,373), and 3,419 cooling degree days, 3.8 times the median (908). One month needs 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 7,999 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 310 | 20 |
| February | 185 | 40 |
| March | 89 | 103 |
| April | 21 | 207 |
| May | 1 | 392 |
| June | 0 | 531 |
| July | 0 | 601 |
| August | 0 | 628 |
| September | 0 | 476 |
| October | 17 | 287 |
| November | 115 | 100 |
| December | 272 | 35 |
| Year (annual) | 1,011 | 3,419 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00418354. A degree day is one degree of a day's mean temperature below 65°F (heating) or above it (cooling); utilities use them to estimate energy use.
How does Sinton's climate compare?
Sinton is warmer than 282 of the other 320 places with their own NOAA record in Texas, and wetter than 174. Across the 7,247 U.S. stations with normals, its annual mean of 71.5°F is warmer than 96%.
In the Köppen classification computed from these normals, Sinton is Cfa: temperate, no dry season, hot summer. What the classes mean.
Places with the most similar year elsewhere
Measured month by month on the normal high, low and precipitation, among places of 20,000 or more people in other states:
Source: NOAA NCEI 1991-2020 normals for every station PlainClimate covers. Similarity: the root-mean-square difference of the 36 monthly figures, precipitation weighted so an inch counts like 6°F.
Which places near Sinton share this climate record?
9 places have no NOAA station with 1991-2020 normals of their own, and this station is the nearest full record. A place's own climate can differ from these figures, by several degrees where it sits much higher or lower than the station, nearer the coast, or inside a large city's heat; for the larger places the next nearest records are named with their yearly mean, so the spread around them is visible, and places of 50,000 or more have their own page with NOAA's gridded normals.
- Odem, TX2,292 people · 7 mi S
- Taft Southwest, TX1,399 people · 10 mi SE
- St. Paul, TX1,165 people · 4 mi N
- Morgan Farm, TX467 people · 3 mi S
- Del Sol, TX351 people · 2 mi SE
- Edroy, TX297 people · 10 mi SW
- Loma Linda, TX230 people · 4 mi SE
- La Paloma Addition, TX107 people · 3 mi SE
- Rancho Chico, TX48 people · 3 mi SE
Source: Census Bureau 2024 Gazetteer (place centers) and Vintage 2024 population estimates. Distance and direction from the station to each place's center.
Questions about Sinton's climate
What is the coldest month in Sinton?
January, with a normal high of 66°F and a normal low of 45°F. The warmest is August (95°F by day, 76°F at night).
Does it snow in Sinton?
Rarely: NOAA's normal is 0.4 inch a year.
What is the rainiest month in Sinton?
September, with 5.28 in of precipitation in a normal year; the driest is January with 1.65 in.
What plant hardiness zone is Sinton in?
The USDA's 2023 map puts Sinton in zone 9b in ZIP code 78387, the nearest ZIP area. By the same method at Sinton's NOAA station, the coldest night of a typical year reaches 27°F (15 years, 1991-2020): zone 9b.
How late can frost come in Sinton?
In half of years the last 32°F night comes after February 1; in one year in ten it comes after March 6. Waiting until March 6 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Texas climateThe statewide normals and every place in the state
- Welder Wildlife Foundation, TX9 miles from this station, 70.5°F a year
- Corpus Christi, TX18 miles from this station, 73.0°F a year
- Robstown, TX19 miles from this station, 73.1°F a year
- Mathis, TX20 miles from this station, 71.1°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made