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McAllen, Texas climate
BSh Hot semi-arid
McAllen has a seasonal tropical climate (Hot semi-arid, Köppen BSh). The hottest month is August with an average daily high near 99°F, while the coldest is January averaging around 49°F at night. Precipitation totals about 19 inches a year and is strongly seasonal — September alone averages 3.8 inches while December barely receives 0.57 inches.
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figuresClear vs cloudy days
Share of days each month that are clear, partly cloudy or cloudy · 1991–2020 · hover a month for the day countsMcAllen climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 71 | 76 | 82 | 87 | 92 | 96 | 98 | 99 | 94 | 89 | 80 | 73 |
| Avg temp (°F) | 60 | 65 | 70 | 76 | 82 | 86 | 87 | 88 | 84 | 78 | 68 | 62 |
| Avg low (°F) | 49 | 53 | 59 | 65 | 71 | 76 | 77 | 77 | 73 | 66 | 57 | 51 |
| Precipitation (in) | 0.7 | 0.6 | 1.0 | 1.4 | 1.4 | 3.1 | 1.6 | 1.5 | 3.8 | 2.0 | 1.1 | 0.6 |
| Snowfall (in) | — | — | — | — | — | — | — | — | — | — | — | 0.1 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 71 | 76 | 82 | 87 | 92 | 96 |
| Avg temp (°F) | 60 | 65 | 70 | 76 | 82 | 86 |
| Avg low (°F) | 49 | 53 | 59 | 65 | 71 | 76 |
| Precipitation (in) | 0.7 | 0.6 | 1.0 | 1.4 | 1.4 | 3.1 |
| Snowfall (in) | — | — | — | — | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 98 | 99 | 94 | 89 | 80 | 73 |
| Avg temp (°F) | 87 | 88 | 84 | 78 | 68 | 62 |
| Avg low (°F) | 77 | 77 | 73 | 66 | 57 | 51 |
| Precipitation (in) | 1.6 | 1.5 | 3.8 | 2.0 | 1.1 | 0.6 |
| Snowfall (in) | — | — | — | — | — | 0.1 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 6 | 3 | 2 | 3 |
| Days with high ≥ 90°F (days) | 0.2 | 2 | 4 | 9 | 19 | 25 | 25 | 26 | 23 | 11 | 2 | 0.3 |
| Days with low ≤ 32°F (days) | 0.5 | 0.5 | — | — | — | — | — | — | — | — | — | 0.3 |
| Days with snowfall ≥ 1 in (days) | — | — | — | — | — | — | — | — | — | — | — | 0.0 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 3 | 3 | 3 | 3 | 3 | 3 |
| Days with high ≥ 90°F (days) | 0.2 | 2 | 4 | 9 | 19 | 25 |
| Days with low ≤ 32°F (days) | 0.5 | 0.5 | — | — | — | — |
| Days with snowfall ≥ 1 in (days) | — | — | — | — | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 3 | 3 | 6 | 3 | 2 | 3 |
| Days with high ≥ 90°F (days) | 25 | 26 | 23 | 11 | 2 | 0.3 |
| Days with low ≤ 32°F (days) | — | — | — | — | — | 0.3 |
| Days with snowfall ≥ 1 in (days) | — | — | — | — | — | 0.0 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 59 | 59 | 60 | 58 | 52 | 42 | 38 | 38 | 46 | 41 | 50 | 59 |
| Clear days (≤ 30% cloud) | 8 | 7 | 7 | 7 | 8 | 13 | 15 | 15 | 12 | 14 | 10 | 7 |
| Partly cloudy days (30–70%) | 9 | 8 | 10 | 11 | 12 | 11 | 10 | 11 | 10 | 10 | 10 | 10 |
| Cloudy days (≥ 70%) | 14 | 13 | 14 | 12 | 11 | 6 | 6 | 5 | 8 | 7 | 10 | 14 |
| Relative humidity (%) | 71 | 69 | 66 | 65 | 66 | 66 | 67 | 66 | 72 | 71 | 71 | 71 |
| Wind speed (mph) | 7.3 | 8.1 | 8.7 | 9.0 | 9.0 | 8.5 | 8.7 | 7.5 | 6.0 | 6.6 | 6.9 | 7.0 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 59 | 59 | 60 | 58 | 52 | 42 |
| Clear days (≤ 30% cloud) | 8 | 7 | 7 | 7 | 8 | 13 |
| Partly cloudy days (30–70%) | 9 | 8 | 10 | 11 | 12 | 11 |
| Cloudy days (≥ 70%) | 14 | 13 | 14 | 12 | 11 | 6 |
| Relative humidity (%) | 71 | 69 | 66 | 65 | 66 | 66 |
| Wind speed (mph) | 7.3 | 8.1 | 8.7 | 9.0 | 9.0 | 8.5 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 38 | 38 | 46 | 41 | 50 | 59 |
| Clear days (≤ 30% cloud) | 15 | 15 | 12 | 14 | 10 | 7 |
| Partly cloudy days (30–70%) | 10 | 11 | 10 | 10 | 10 | 10 |
| Cloudy days (≥ 70%) | 6 | 5 | 8 | 7 | 10 | 14 |
| Relative humidity (%) | 67 | 66 | 72 | 71 | 71 | 71 |
| Wind speed (mph) | 8.7 | 7.5 | 6.0 | 6.6 | 6.9 | 7.0 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Mcallen (NOAA GHCN station USC00415701), about 2 km from the city centre.
Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.