BMT graduations happen year-round, and San Antonio's weather swings hard between seasons. Here's what to expect and pack, whichever month your Airman's ceremony falls on.
Quick Answer
- Hottest months: July and August, highs near 95–96°F (35°C), very humid.
- Coldest month: January, highs around 63°F (17°C), lows near 41°F (5°C).
- Best months to visit: March–April and October–November, mild and drier.
Averages based on 1991–2020 NOAA climate normals for San Antonio. Always check the actual forecast a few days before you travel.
Average Temperatures by Month
| Month | Avg. High | Avg. Low |
|---|---|---|
| January | 63°F (17°C) | 41°F (5°C) |
| February | 68°F (20°C) | 45°F (7°C) |
| March | 74°F (23°C) | 52°F (11°C) |
| April | 80°F (27°C) | 58°F (15°C) |
| May | 87°F (30°C) | 66°F (19°C) |
| June | 92°F (34°C) | 73°F (23°C) |
| July | 95°F (35°C) | 75°F (24°C) |
| August | 96°F (36°C) | 75°F (24°C) |
| September | 90°F (32°C) | 70°F (21°C) |
| October | 82°F (28°C) | 60°F (16°C) |
| November | 72°F (22°C) | 50°F (10°C) |
| December | 65°F (18°C) | 42°F (6°C) |
Source: NOAA 1991–2020 climate normals for San Antonio, TX.
What to Pack, Season by Season
Summer graduations (May–September): Expect heat and humidity, with highs regularly in the 90s and around 18 days a year hitting 100°F or hotter. Pack lightweight, breathable clothing, sunglasses, sunscreen, a hat, and a refillable water bottle — outdoor ceremony seating gets hot fast.
Winter graduations (December–February): Mild compared to most of the country, but mornings can be genuinely cold, with roughly 14 freezing days a year, mostly overnight. Bring a light jacket or layers for an early ceremony, even if the afternoon warms up.
Spring & fall graduations (March–April, October–November): Generally the most comfortable stretch, with mild days and cooler nights — still worth layering since temperature swings between morning and afternoon can be significant.
Plan Your Trip
Packing List
Everything else to bring for graduation week.
Hotels Near Lackland
Book early — graduation week rooms go fast.
BMT Schedule
The full phase-by-phase graduation timeline.
Frequently Asked Questions
What is the hottest month in San Antonio?
August, with an average high around 96°F (36°C). July is close behind. San Antonio sees roughly 18 days a year of 100°F or hotter, almost all in June through September.
What is the coldest month in San Antonio?
January, with an average high near 63°F (17°C) and lows around 41°F (5°C). Freezing temperatures happen on roughly 14 days a year, mostly November through March, but rarely last all day.
What should I wear to an outdoor BMT graduation ceremony?
Check the forecast close to your travel date and dress in layers. Summer graduations call for lightweight, breathable clothing, sun protection, and water; winter graduations are mild by most standards but mornings can be chilly, so bring a light jacket.