Port Aransas, Texas climate: Normal weather by month, frost dates and records
Port Aransas's normal year runs from 50°F January nights to 89°F August afternoons, with 35.5 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 22.2°C, January lows of 10°C, August highs of 32°C, 903 mm of precipitation a year.
- NOAA stationPort Aransas
- Station IDUSC00417170
- Location27.84°N 97.06°W
- Elevation12 ft (4 m)
- Population3,616
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Port Aransas.
- Jan 62° 50°
- Feb 65° 54°
- Mar 70° 60°
- Apr 76° 67°
- May 81° 73°
- Jun 87° 78°
- Jul 88° 80°
- Aug 89° 80°
- Sep 87° 77°
- Oct 81° 71°
- Nov 72° 61°
- Dec 65° 53°
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 Port Aransas each month?
August is the warmest month, with normal highs of 89°F; January the coldest, with normal lows of 50°F. The most precipitation falls in September (6.51 in), the least in December (1.71 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 62°F | 50°F | 56.4°F | 2.11 | 9 | <1 | <1 | 10 h 30 min |
| February | 65°F | 54°F | 59.3°F | 1.92 | 9 | <1 | <1 | 11 h 10 min |
| March | 70°F | 60°F | 65.1°F | 2.42 | 7 | <1 | <1 | 12 h |
| April | 76°F | 67°F | 71.2°F | 2.00 | 5 | <1 | <1 | 12 h 50 min |
| May | 81°F | 73°F | 77.3°F | 3.99 | 5 | <1 | <1 | 13 h 30 min |
| June | 87°F | 78°F | 82.5°F | 3.72 | 5 | 7 | <1 | 13 h 50 min |
| July | 88°F | 80°F | 83.8°F | 2.57 | 4 | 15 | <1 | 13 h 50 min |
| August | 89°F | 80°F | 84.3°F | 1.80 | 5 | 22 | <1 | 13 h 10 min |
| September | 87°F | 77°F | 81.6°F | 6.51 | 10 | 11 | <1 | 12 h 20 min |
| October | 81°F | 71°F | 76.0°F | 3.92 | 7 | 1 | <1 | 11 h 30 min |
| November | 72°F | 61°F | 66.3°F | 2.88 | 7 | <1 | <1 | 10 h 50 min |
| December | 65°F | 53°F | 59.2°F | 1.71 | 8 | <1 | <1 | 10 h 20 min |
| Year (annual) | 77°F | 67°F | 71.9°F | 35.55 | 81 | 57 | 1 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 17°C | 10°C | 13.6°C | 54 mm |
| February | 18°C | 12°C | 15.2°C | 49 mm |
| March | 21°C | 16°C | 18.4°C | 61 mm |
| April | 24°C | 19°C | 21.8°C | 51 mm |
| May | 27°C | 23°C | 25.2°C | 101 mm |
| June | 30°C | 26°C | 28.1°C | 94 mm |
| July | 31°C | 26°C | 28.8°C | 65 mm |
| August | 32°C | 27°C | 29.1°C | 46 mm |
| September | 30°C | 25°C | 27.6°C | 165 mm |
| October | 27°C | 22°C | 24.4°C | 100 mm |
| November | 22°C | 16°C | 19.1°C | 73 mm |
| December | 19°C | 12°C | 15.1°C | 43 mm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00417170; 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 Port Aransas?
Normal highs sit between 65°F and 85°F in March, April, May, October, November and December. Of those, May has the fewest days with rain (5).
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 USC00417170.
When is the last frost in Port Aransas?
A night at 32°F or colder comes in only 37% of years in Port Aransas (NOAA). NOAA's median date of the last spring frost is January 16 and of the first autumn frost January 5.
NOAA puts the median frost-free season at 365 days, and the season without a hard freeze (28°F) at 365 days.
The USDA's 2023 Plant Hardiness Zone Map puts Port Aransas in zone 10a in ZIP code 78373.
Frost dates for every NOAA station in Texas · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00417170; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026. 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 Port Aransas?
In a normal year in Port Aransas, 57 days a year reach 90°F, 1 night falls to 32°F or colder and 81 days bring measurable precipitation.
- Days at 90°F or more
- 57a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 1a normal year
- Days that stay below freezing
- fewer than 1high of 32°F or less
- Days with 0.01 inch of precipitation
- 81a normal year
Source: NOAA NCEI 1991-2020 annual normals, station USC00417170.
How sunny is Port Aransas?
Over a year 80% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Port Aransas, 4.9 kWh per square metre a day. August is the sunniest month (89%) and December the cloudiest (70%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 70% | 3.0 |
| February | 70% | 3.6 |
| March | 73% | 4.6 |
| April | 77% | 5.4 |
| May | 81% | 6.0 |
| June | 87% | 6.6 |
| July | 87% | 6.5 |
| August | 89% | 6.3 |
| September | 81% | 5.2 |
| October | 84% | 4.6 |
| November | 77% | 3.5 |
| 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 Port Aransas need?
A normal year in Port Aransas brings 833 heating degree days, 84% fewer than the median U.S. place (5,373), and 3,378 cooling degree days, 3.7 times the median (908). No month reaches 300 heating degree days. For gardens and crops, NOAA counts 8,090 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 276 | 8 |
| February | 175 | 15 |
| March | 72 | 75 |
| April | 12 | 198 |
| May | 0 | 382 |
| June | 0 | 523 |
| July | 0 | 583 |
| August | 0 | 598 |
| September | 0 | 499 |
| October | 6 | 346 |
| November | 80 | 120 |
| December | 212 | 31 |
| Year (annual) | 833 | 3,378 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00417170. 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 Port Aransas's climate compare?
Port Aransas is warmer than 290 of the other 320 places with their own NOAA record in Texas, and wetter than 190. Across the 7,247 U.S. stations with normals, its annual mean of 71.9°F is warmer than 97%.
In the Köppen classification computed from these normals, Port Aransas 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 Port Aransas share this climate record?
4 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.
- Ingleside, TX10,155 people · 9 mi W
- Aransas Pass, TX8,742 people · 6 mi NW
- Ingleside on the Bay, TX602 people · 10 mi W
- Falman, TX13 people · 9 mi NW
Source: Census Bureau 2024 Gazetteer (place centers) and Vintage 2024 population estimates. Distance and direction from the station to each place's center.
What do Port Aransas's other NOAA stations record?
One more NOAA station keeps 1991-2020 normals in or near Port Aransas. This page uses Port Aransas; the other differs by site and elevation:
| Station | From this station | Elevation | Year | Jan low | Jul high | Precip. | Snow | Last frost |
|---|---|---|---|---|---|---|---|---|
| Port Aransas (11 mi SSW) USC00417176 | 11 mi SW | 6 ft | 71.9°F | 49°F | 89°F | 34.1 | – | January 22 |
Source: NOAA NCEI 1991-2020 normals for each station. Last frost: the median last spring date of 32°F.
Questions about Port Aransas's climate
What is the coldest month in Port Aransas?
January, with a normal high of 62°F and a normal low of 50°F. The warmest is August (89°F by day, 80°F at night).
Does it snow in Port Aransas?
Rarely: NOAA's normal is no measurable snow a year.
What is the rainiest month in Port Aransas?
September, with 6.51 in of precipitation in a normal year; the driest is December with 1.71 in.
What plant hardiness zone is Port Aransas in?
The USDA's 2023 map puts Port Aransas in zone 10a in ZIP code 78373.
Nearby and next
- Texas climateThe statewide normals and every place in the state
- Rockport, TX17 miles from this station, 73.0°F a year
- C C Botanical Gardens, TX24 miles from this station, 71.7°F a year
- Corpus Christi Cabaniss Field, TX25 miles from this station, 73.6°F a year
- Corpus Christi, TX28 miles from this station, 73.0°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made