Big Bend National Park weather in May
May in Big Bend National Park: hot, dry, with clean air — a great time to visit.
#9 of 12 months in Big Bend National Park · #430 of 604 destinations to visit in May · comfort 73/100 (tier B)
Updated June 2026 · climate normals from ERA5 reanalysis
Big Bend National Park climate normals — May
| Daytime high | 32°C / 89°F | 🥵 hot |
|---|---|---|
| Nighttime low | 17°C / 63°F | |
| Feels like (high) | 30°C / 86°F | |
| Rainfall | 13 mm / 0.5 in | ☀️ dry |
| Rainy days | 4 days | |
| Humidity | 32% | 🌵 dry |
| Dew point | 3°C / 37°F | |
| Sunshine | 12.2 h/day | |
| Daylight | 13.6 h | |
| Wind | 16 km/h / 10 mph | |
| Air quality (US AQI) | 50 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Big Bend National Park in May — FAQ
- Is May a good time to visit Big Bend National Park?
- May in Big Bend National Park: hot, dry, with clean air — a great time to visit. It ranks #9 of 12 months for Big Bend National Park on SeasonMap's comfort score (73/100).
- What is the weather like in Big Bend National Park in May?
- In May, Big Bend National Park averages a daily high of 31.9°C and a low of 17.3°C, with about 12.8 mm of rain over roughly 4.2 rainy days.
- What is the air quality in Big Bend National Park in May?
- Big Bend National Park has a mean US Air Quality Index of about 50 in May.