Climate averages 1991–2020
McAllen weather
in January.
A mild, fairly dry month: the coolest and the 2nd driest of the year. Meets the pleasant-weather rule
Long-term climate patterns, not a forecast for a particular trip.
January is a mild month in McAllen: daytime highs average 21.8°C and nights cool to about 12.1°C. By daytime temperature it is the coolest month of the year.
Expect about 26 mm of rain on roughly 4 days, which makes January a fairly dry month (the 2nd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 10 h 42 min on an average January day.
The nearest other city in this atlas is Mission (10 km away). In January its highs average 21.9°C, about as warm as McAllen, with 26 mm of rain.
Among the 498 cities listed in the United States, McAllen ranks joint 22nd of 498 for the warmest January highs and joint 43rd of 498 for the driest January (rainfall, lowest first). The mean January high of those 498 cities is 9.5°C; McAllen is 12.3°C warmer than that mean.
From January to February, average highs rise by 2.6°C to 24.4°C, and monthly rainfall falls from 26 mm to 24 mm.
The annual picture
January in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
McAllen climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January, selected | 21.8°C12.1°C | 12.1°C | 26 | 4.4 | 10.711 h |
| February | 24.4°C14.1°C | 14.1°C | 24 | 4.4 | 11.311 h |
| March | 27.2°C16.8°C | 16.8°C | 36 | 5.2 | 12.012 h |
| April | 30.5°C19.9°C | 19.9°C | 44 | 5.3 | 12.813 h |
| May | 33.0°C23.1°C | 23.1°C | 55 | 6.6 | 13.413 h |
| June | 34.9°C25.1°C | 25.1°C | 51 | 7.0 | 13.714 h |
| July | 35.6°C25.5°C | 25.5°C | 55 | 5.7 | 13.614 h |
| August | 35.9°C25.7°C | 25.7°C | 39 | 6.7 | 13.113 h |
| September | 32.5°C23.8°C | 23.8°C | 88 | 11.8 | 12.312 h |
| October | 30.1°C20.5°C | 20.5°C | 59 | 6.7 | 11.612 h |
| November | 25.7°C16.2°C | 16.2°C | 35 | 5.3 | 10.911 h |
| December | 22.5°C13.0°C | 13.0°C | 30 | 5.1 | 10.511 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
January in nearby cities
- Mission in JanuaryUnited States · 10 kmHigh 21.9°C · Low 12.0°C · 26 mm rain
- Edinburg in JanuaryUnited States · 13 kmHigh 21.8°C · Low 12.0°C · 26 mm rain
- Reynosa in JanuaryMexico · 15 kmHigh 22.0°C · Low 12.2°C · 26 mm rain
- Ciudad Río Bravo in JanuaryMexico · 28 kmHigh 21.9°C · Low 12.4°C · 28 mm rain
- Heroica Matamoros in JanuaryMexico · 81 kmHigh 21.0°C · Low 13.7°C · 32 mm rain
- Nuevo Laredo in JanuaryMexico · 191 kmHigh 20.5°C · Low 10.2°C · 24 mm rain
- Corpus Christi in JanuaryUnited States · 196 kmHigh 18.9°C · Low 10.6°C · 48 mm rain
- Ciudad Benito Juárez in JanuaryMexico · 196 kmHigh 19.7°C · Low 9.4°C · 27 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for McAllen) is explained once on the McAllen year overview and on the Sources, method and limits page.
Edinburg and Mission lie in the same rainfall cell, so their rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.