| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 17.9° | 4.4° | 51.9mm | 7.9 | 77 |
| February | 19.3° | 6° | 40.7mm | 8.8 | 80 |
| March | 23.5° | 10.4° | 57mm | 8.8 | 82 |
| April | 27.1° | 14.1° | 49.7mm | 6.4 | 87 |
| May | 30.5° | 18.9° | 80.5mm | 7.5 | 71 |
| June | 33.6° | 22.4° | 82.4mm | 6.5 | 61 |
| July | 34.5° | 23.3° | 84.9mm | 6.6 | 57 |
| August | 35.4° | 23.5° | 62.4mm | 4.2 | 58 |
| September | 32.3° | 20.4° | 107.7mm | 7.5 | 64 |
| October | 27.5° | 14.9° | 114.8mm | 8 | 82 |
| November | 22.1° | 9.3° | 59.4mm | 7 | 86 |
| December | 18° | 4.7° | 43.4mm | 8.1 | 77 |
January in San Antonio averages a daily high of 17.9°C with nights around 4.4°C. Expect roughly 7.9 wet days totalling 51.9mm. Comfortable conditions for being outdoors all day.
February in San Antonio averages a daily high of 19.3°C with nights around 6°C. Expect roughly 8.8 wet days totalling 40.7mm. Comfortable conditions for being outdoors all day.
March in San Antonio averages a daily high of 23.5°C with nights around 10.4°C. Expect roughly 8.8 wet days totalling 57mm. Comfortable conditions for being outdoors all day.
April in San Antonio averages a daily high of 27.1°C with nights around 14.1°C. Expect roughly 6.4 wet days totalling 49.7mm. Comfortable conditions for being outdoors all day.
May in San Antonio averages a daily high of 30.5°C with nights around 18.9°C. Expect roughly 7.5 wet days totalling 80.5mm. Generally workable, with some weather to plan around.
June in San Antonio averages a daily high of 33.6°C with nights around 22.4°C. Expect roughly 6.5 wet days totalling 82.4mm. Generally workable, with some weather to plan around.
July in San Antonio averages a daily high of 34.5°C with nights around 23.3°C. Expect roughly 6.6 wet days totalling 84.9mm. Generally workable, with some weather to plan around.
August in San Antonio averages a daily high of 35.4°C with nights around 23.5°C. Expect roughly 4.2 wet days totalling 62.4mm. Generally workable, with some weather to plan around.
September in San Antonio averages a daily high of 32.3°C with nights around 20.4°C. Expect roughly 7.5 wet days totalling 107.7mm. Generally workable, with some weather to plan around.
October in San Antonio averages a daily high of 27.5°C with nights around 14.9°C. Expect roughly 8 wet days totalling 114.8mm. Comfortable conditions for being outdoors all day.
November in San Antonio averages a daily high of 22.1°C with nights around 9.3°C. Expect roughly 7 wet days totalling 59.4mm. Comfortable conditions for being outdoors all day.
December in San Antonio averages a daily high of 18°C with nights around 4.7°C. Expect roughly 8.1 wet days totalling 43.4mm. Comfortable conditions for being outdoors all day.
Each month scores out of 100. It starts at 100 and loses points for daytime highs outside a 20–27°C band, for wet days, and for nights below 2°C. Nothing else is weighted in — no crowd data, no prices, no opinion. San Antonio peaks at 87.
Based on 30 years of records, February–April scores highest for comfort in San Antonio, balancing daytime temperature against rainfall.
August is the warmest, averaging a daily high of 35.4°C.
October is the wettest, averaging 114.8mm of rain across roughly 8 wet days.
January is the coolest month, with average daily highs around 17.9°C.