San Juan, TX Weather & Climate Normals
What a normal year in San Juan actually looks like
On the 30-year record NOAA keeps for San Juan, TX, the comfort score comes out to 56/100, strongly seasonal: Comfortable weather is limited to a shorter window; summers, winters, or precipitation swing wide. Only 5 months a year land in the 55–75°F range this site treats as mild.
How much San Juan's weather actually swings
Average temperatures in San Juan run from 60°F in Jan up to 88°F in Aug, a 27.6°F seasonal swing, a middling gap by national standards.
San Juan, month by month
| Month | Avg high | Avg low | Precip | Snow |
|---|---|---|---|---|
| Jan | 71°F | 49°F | 0.65in | 0in |
| Feb | 76°F | 53°F | 0.64in | 0in |
| Mar | 82°F | 59°F | 1.04in | 0in |
| Apr | 87°F | 65°F | 1.37in | 0in |
| May | 92°F | 71°F | 1.39in | 0in |
| Jun | 96°F | 76°F | 3.05in | 0in |
| Jul | 98°F | 77°F | 1.62in | 0in |
| Aug | 99°F | 77°F | 1.45in | 0in |
| Sep | 94°F | 73°F | 3.81in | 0in |
| Oct | 89°F | 66°F | 2.04in | 0in |
| Nov | 80°F | 57°F | 1.05in | 0in |
| Dec | 73°F | 51°F | 0.57in | 0.1in |
If you're timing a visit, Jan, Feb, Mar, Nov, and Dec are San Juan's mildest stretch; if you're moving there, you should plan around Aug's heat instead.
How wet San Juan actually gets
Over a typical year, San Juan sees about 18.68in of precipitation a year across roughly 43 days with measurable rain or snow, with 0.1in of snow a year.
San Juan against the rest of the country
Out of 4876 cities scored here, San Juan comes in at 750; within TX alone it ranks 77 of 384. Population is about 37,341.
Checking the actual forecast
These figures come from Mcallen, TX US, the NOAA station 6.2 miles from San Juan, averaged over 30 years, not tomorrow's forecast.
More on how this is worked out
Why some cities show no snow or rain figure · What a 30-year climate normal actually is