April brings 23°C daytime highs, 48mm of precipitation across about 5 wet days and 12.7 hours of daylight — best for hiking and cycling. The strongest run of the year is February to April. June is the quietest month: quiet and local, and still good for beach days, swimming and quiet and local.
Long-run climate normals for San Antonio. Month ratings compare months within San Antonio only — they are not a ranking of San Antonio against other destinations, and they are not a forecast for a specific year.
Last updated: · Live forecast data refreshes hourly.
| Best month | April — Hiking, Cycling |
| Best 3-month window | February–April |
| Quietest month | June — Quiet and local |
| Driest month | March — 38mm |
| Wettest month | May — 108mm |
| Warmest / coolest | July 35°C / February 16°C |
| Seasonality | Fairly even across the year |
| Annual rainfall | 737mm over roughly 68 rain days |
June gets roughly 119% more precipitation than April — 105mm against 48mm. That difference, more than temperature, is what changes how a day here feels.
Daytime highs only move 19°C across the whole year (16–35°C), so timing matters far less here than rainfall does.
June gives you 13.9 hours of daylight against just 10.1 in December — a 4-hour difference in how much you can actually fit into a day.
March is the driest month at 38mm across roughly 4 wet days, while May peaks at 108mm.
November is almost as good as April, but usually quieter and cheaper. If your dates are flexible, it is the easier trip.
San Antonio stays fairly consistent all year, so there is no month you need to avoid. What you plan to do matters more than when you go.
Ratings compare months within San Antonio, not against destinations worldwide: five stars means the best time to be here, not that San Antonio beats anywhere else. Tags describe what the conditions actually suit.
| Month | Rating | High / Low | Precipitation | Wet days | Sun | Daylight | Best for |
|---|---|---|---|---|---|---|---|
| January | ★★★☆☆ | 16°C / 4°C | 42mm | 4 | 5h | 10.3h | Hiking · Cycling |
| February | ★★★☆☆ | 16°C / 4°C | 42mm | 4 | 5h | 11h | Hiking · Cycling |
| March | ★★★★☆ | 19°C / 7°C | 38mm | 4 | 5h | 11.8h | Hiking · Cycling · Spring greenery |
| April | ★★★★★ | 23°C / 11°C | 48mm | 5 | 6h | 12.7h | Hiking · Cycling |
| May | ★★☆☆☆ | 28°C / 16°C | 108mm | 11 | 6h | 13.5h | Beach days · Swimming · Quiet and local |
| June | ★★☆☆☆ | 32°C / 20°C | 105mm | 10 | 5h | 13.9h | Beach days · Swimming · Quiet and local |
| July | ★★☆☆☆ | 35°C / 23°C | 46mm | 5 | 5h | 13.7h | Beach days · Swimming · Quiet and local |
| August | ★★★☆☆ | 35°C / 23°C | 48mm | 5 | 11h | 13h | Beach days · Swimming · Reliable sunshine |
| September | ★★★★☆ | 32°C / 20°C | 58mm | 6 | 11h | 12.2h | Beach days · Swimming · Reliable sunshine |
| October | ★★★☆☆ | 28°C / 16°C | 76mm | 7 | 4h | 11.3h | Beach days · Swimming · Quiet and local |
| November | ★★★★★ | 23°C / 11°C | 42mm | 4 | 4h | 10.5h | Hiking · Cycling |
| December | ★★★★★ | 19°C / 7°C | 38mm | 4 | 8h | 10.1h | Hiking · Cycling |
| You are planning | Pick | Why |
|---|---|---|
| Sun & beach days | September | 11h daily sunshine, 32°C highs and only 6 rain days. |
| City walking & sightseeing | November | 23°C highs with 10.5h of daylight — long days without heat fatigue. |
| Photography & light | August | 11h of sun and 13h daylight give the widest window for golden-hour work. |
| Value & fewer crowds | March | Scores 75/100 — close to peak conditions but outside the busiest window. |
| Cooler-weather travel | January | 16°C highs and 4°C nights suit anyone who dislikes heat. |
Each month in San Antonio is described from long-run climate normals and then rated relative to the other eleven months in the same city. A five-star January in a cold destination means January is one of the best times to be there — not that it beats a Mediterranean summer.
| Factor | Weight | What it measures |
|---|---|---|
| Temperature | Described | Average daytime high and overnight low for the month, shown as measured rather than judged. |
| Precipitation | Described | Monthly millimetres and wet-day count, labelled as snow or rain/snow where temperatures make that the likely phase. |
| Sunshine & daylight | Described | Average daily sunshine hours and astronomical daylight length at mid-month, from the city’s latitude. |
| “Best for” tags | Derived | Applied only when the conditions genuinely support the activity — snow depth-friendly cold for skiing, 13–24°C and low rain risk for hiking, dark evenings at high latitude for aurora. A month with few strong use cases gets fewer tags rather than padded ones. |
| Star rating | Relative | Ranks the month against the other eleven months in the same city. Never a comparison between cities. |
Figures are long-run climate averages, not a forecast for a specific year. Where a month lacks sourced rainfall or humidity, the value is modelled from temperature range and rain frequency.
April is the best all-round month in San Antonio: 23°C highs, 48mm of precipitation and 12.7 hours of daylight, which suits hiking and cycling. The strongest three-month window is February to April.
June — 32°C highs, 105mm of precipitation over roughly 10 days and 13.9 hours of daylight. It is the cheapest and least crowded time to go, and it still works for beach days, swimming and quiet and local.
March is the driest month at 38mm over about 4 rain days, against 108mm in May. Across the year San Antonio records around 737mm.
Yes — conditions in San Antonio stay fairly even all year, so there is no month you need to avoid. What you plan to do matters more than when you go.
Daylight ranges from 10.1 hours in December to 13.9 hours in June, calculated from the city's latitude.