Photo: Satxra · CC BY-SA 4.0Weslaco reaches 100° on about 17 days a year, more than 94% of U.S. towns
A typical July afternoon reaches 97°, a January night drops to 51°, and snow is almost unheard of.
A year in Weslaco at a glance
Each month’s typical high and low, and what it brings.
What stands out about Weslaco’s climate
Compared with towns across the U.S., with Weslaco’s place in Texas beside it.
What a year in Weslaco feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 17 days a year reach 100°
And 160 days reach 90°. Frost and day counts come from NOAA’s station at Weslaco, TX, 1.6 miles from the town’s center, at about the same height.
The 2023 USDA map puts Weslaco’s center in zone 10a: the coldest night of a typical winter, averaged over 1991–2020, reaches about 32°. Plant labels use the zone; frost dates tell you when to plant.
Freezing nights by month
Average nights at or below 32°
90° days by month
Average days at 90° or more
About 23 inches of rain a year
September is the wettest month and February the driest. Rain falls on about 57 days a year. Snow is rare: about 0.2" in a normal year at Mercedes 6 Sse, TX, so most winters see none.
Rain + melted snow by month
Inches of water
Heating and cooling a home in Weslaco
12% of the work is heating, so air conditioning is the bigger bill. No month averages under 55°.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Weslaco, TX.
Living with Weslaco’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
Zone 10a. Frost comes about 1 winter in 2, so the growing year is set by heat, not cold: 17 days at 100° make midsummer the hard season for gardens.
Months with highs of 62–84° and lows of 40° or more: January, February, March, November and December. 13 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Weslaco from natural hazards, hurricanes are the largest share (52%); heat waves, cold waves, winter storms and ice storms together are 23%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Weslaco and its neighbors
Every town next door is within a degree of Weslaco in January and July, closer than the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like Weslaco’s, farther away
TownRatings’ own comparison of NOAA 1991–2020 normals, not a NOAA product: places of 5,000+ at least 150 miles away, one per state, closest on January low, July high, precipitation and snow.
| Town | Jan. low | July high | Precip. | Snow |
|---|---|---|---|---|
| Weslaco, TX | 51° | 97° | 23" | 0.2" |
| Rialto, CA | 43° | 95° | 16" | 0.0" |
| Corona de Tucson, AZ | 36° | 96° | 14" | 0.1" |
| Central Point, OR | 32° | 93° | 22" | 3.4" |
| Waihee-Waiehu, HI | 64° | 89° | 16" | 0.0" |
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value. Snow and frost-free days come from the nearest weather station, so neighbors often share them.
Warmer than it used to be
The last 30 years in Weslaco averaged 1.2° warmer than the 1900s. The biggest change is in February (+2.1°).
A smaller shift than in 61% of U.S. towns.
Change by month
The two periods overlap (1991–2000 is in both), which makes the gap a little smaller than it would be between separate periods.
How Weslaco compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Weslaco’s place among Texas’.
Weslaco weather by month
Highs, lows and precipitation from NOAA’s grid at Weslaco’s center; snow, wet days and snow on the ground from Mercedes 6 Sse, TX. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 72° | 51° | 0.9" | 0.0" | 5 | 0 | 54° – 67° |
| February | 76° | 55° | 0.9" | 0.0" | 4 | 0 | 58° – 73° |
| March | 82° | 61° | 1.2" | 0.0" | 3 | 0 | 65° – 77° |
| April | 87° | 65° | 1.5" | 0.0" | 3 | 0 | 70° – 81° |
| May | 92° | 72° | 2.2" | 0.0" | 4 | 0 | 77° – 85° |
| June | 96° | 75° | 2.8" | 0.0" | 5 | 0 | 83° – 89° |
| July | 97° | 76° | 2.2" | 0.0" | 5 | 0 | 83° – 90° |
| August | 98° | 76° | 1.8" | 0.0" | 5 | 0 | 85° – 90° |
| September | 93° | 73° | 4.9" | 0.0" | 9 | 0 | 80° – 86° |
| October | 88° | 66° | 2.6" | 0.0" | 5 | 0 | 75° – 81° |
| November | 79° | 58° | 1.4" | 0.0" | 4 | 0 | 63° – 75° |
| December | 73° | 52° | 1.1" | 0.2" | 5 | 0 | 56° – 67° |
| Year | 86° | 65° | 23.4" | 0.2" | 57 | 0 |
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from 58° to 73°. August is the most reliable, staying within 5°.
Where Weslaco’s numbers come from
Normals are 30-year averages, not a forecast. How TownRatings reads climate data →
- Temperatures and precipitation: NOAA’s gridded 1991–2020 normals for the 5 km cell at Weslaco’s center.
- Snow: Mercedes 6 Sse, TX.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Weslaco, TX, 1.6 miles from the town’s center, at about the same height; the nearest station that passes our checks for distance, height and agreement with the grid.
- Growing zone: USDA Plant Hardiness Zone Map, 2023. USDA Agricultural Research Service and PRISM Group, Oregon State University, prism.oregonstate.edu/phzm, accessed 8 Oct 2026.
- Then and now: NOAA’s gridded normals for 1901–2000 at the same cell.
- Storms and extremes: FEMA National Risk Index (expected annual losses to buildings).
Common questions about Weslaco’s climate
What is the weather like in Weslaco?
A typical July afternoon reaches 97°, a January night drops to 51°, and snow is almost unheard of. Milder January nights than 97% of U.S. towns; hotter July afternoons than 98% of U.S. towns.
How cold does it get in Weslaco in winter?
January nights average 51°. About 1 nights a year reach 32° or below. In the coldest January of the last 30 years the month averaged 54°.
How much snow does Weslaco get?
About 0.2 inches in a normal winter at Mercedes 6 Sse, TX, so most winters see none.
How hot does it get in Weslaco?
July, with a typical high of 97° and a low of 76°. About 160 days a year reach 90° and 17 reach 100° (Weslaco, TX).
When is the first and last frost in Weslaco?
Most years have no frost at all: a 32° night comes in about 44% of winters at Weslaco, TX, usually in December or January.
What growing zone is Weslaco in?
Zone 10a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 32°.
What is the best time of year to visit Weslaco?
By one simple rule (highs of 62–84° and lows of 40° or more), January, February, March, November and December. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Weslaco getting warmer?
Yes: 1991–2020 averaged 1.2° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 61% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Weslaco.
Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000; USDA/PRISM 2023 hardiness zones; FEMA National Risk Index. Today’s forecast: National Weather Service.