Climate Chart of San Antonio, USA

Monthly data: Temperature °C, Rain (mm), Sunshine (h) · 2013–2023

For San Antonio, USA, the climate data cover 2013–2023. Monthly mean temperatures range from January at 11.6 °C to August at 29.8 °C, giving a broad picture of the yearly temperature range without describing daytime highs or lows. The supplied monthly figures also show variation in daily rainfall and sunshine, while the recorded snowfall amounts are small. These averages help set expectations for planning, but do not predict conditions on any particular day.

Climate overview

Temperature

January has the lowest monthly mean temperature, 11.6 °C, while the highest monthly mean is August at 29.8 °C. These are averages for each month, not daytime maximum temperatures, so actual conditions can vary from day to day. The unweighted mean across monthly temperature means is 21.2 °C; it summarizes the calendar-month figures rather than giving a day-weighted annual average.

Rain

Mean daily rainfall is lowest in January at 1.65 mm/day and highest in May at 4.95 mm/day. These are average daily amounts, not monthly totals, and they do not indicate how often rain falls or guarantee dry or wet days. The unweighted mean of the monthly daily-rainfall means is 2.55 mm/day, a summary of the monthly figures rather than a day-weighted annual average.

Sunshine

Daily sunshine duration reaches its highest monthly mean in July at 11.88 hours/day, and its lowest in December at 6.27 hours/day. These averages can help with broad outdoor-planning expectations, but sunshine duration is not the same as day length and does not promise clear skies on a particular day. The unweighted mean across monthly sunshine means is 8.85 hours/day.

Snow

The highest monthly mean daily snowfall is recorded in February at 0.38 mm/day; the unweighted mean across monthly daily-snowfall means is 0.04 mm/day. These are small average amounts, but they cannot establish how many days have snow, snow depth, snow cover, or whether skiing conditions are available.

Best Travel Time Guide for San Antonio, USA: Ideal Seasons and Weather Insights

If lower average rainfall is your priority, January is the conditional option in these data, with mean daily rainfall of 1.65 mm/day. That average cannot guarantee dry days or show how frequently rain occurs; for planning around the month with the highest mean daily rainfall, take rain-ready clothing or a compact umbrella for May, at 4.95 mm/day. For visitors prioritising cooler monthly mean temperatures, January is the relevant choice, at 11.6 °C; this is a monthly mean, not a forecast of daytime temperatures, so check the forecast nearer your trip and pack adaptable layers. Sunshine averages may also help with outdoor scheduling: July has the highest mean daily sunshine duration at 11.88 hours/day, while December has the lowest at 6.27 hours/day. These figures describe sunshine duration, not day length or guaranteed clear weather.

Snowfall averages are not a basis for predicting snow cover or winter activities: the highest monthly mean daily snowfall is February at 0.38 mm/day. Treat that as a broad climate reference, not a measure of snowy days or a guarantee of particular ground conditions.

Climate Data Overview for San Antonio, USA

Explore the comprehensive climate data for San Antonio, USA. This detailed table provides valuable insights into temperature variations, precipitation levels, and seasonal changes, helping you understand the unique weather patterns of this region.

Month	Average: Temperature °C	Rain (mm) / day	Snow (mm) / day	Sunshine (h) / day
Jan	11.6	1.65	0.06	7.09
Feb	13.4	1.70	0.38	6.83
Mar	17.9	1.94	0.00	7.69
Apr	21.0	3.19	0.00	8.62
May	24.4	4.95	0.00	9.69
Jun	28.0	2.16	0.00	11.59
Jul	29.6	1.80	0.00	11.88
Aug	29.8	2.37	0.00	11.19
Sep	27.2	3.54	0.00	9.96
Oct	22.5	3.25	0.00	8.85
Nov	16.1	2.29	0.00	6.53
Dec	13.1	1.71	0.02	6.27
Average	21.2	2.55	0.04	8.85