Last updated: August 27, 2025
In Santa Ana, Mexico, the average temperature in September hovers around a warm 28°C (83°F), with the mercury dipping as low as 21°C (70°F) and soaring to a high of 38°C (101°F). Expect 103 mm (4.0 in) of precipitation spread over 14 days, contributing to an average humidity of 82%. Whether you're seeking sun or shade, this month promises a mix of warmth and moisture!
In September in Santa Ana, the average temperature is 28°C (83°F), with maximums reaching 38°C (101°F) and minimums dropping to as low as 21°C (70°F). This makes it an ideal time for travelers to enjoy warm weather and outdoor activities.
In Santa Ana in September, the precipitation amount is 103 mm (4.0 in) over a span of 14 days.
In Santa Ana in September, humidity is 82%. With an average temperature of 28°C (83°F), this humidity feels like stepping into a warm, damp embrace, which can make traveling feel heavy and exhausting, as every movement can be met with a sticky veil of moisture that clings to the skin.
In Santa Ana in September, the maximum UV index is 12, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, underscoring the importance of sun protection. For detailed information, you can check the Hourly UV Index in Santa Ana.
UV Risk Categories
Weather in Santa Ana varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Santa Ana, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 18°C (64°F) | 16 mm (0.6 inches) | 74% | high |
| February Weather | 19°C (66°F) | 29 mm (1.2 inches) | 67% | very high |
| March Weather | 21°C (71°F) | 11 mm (0.4 inches) | 60% | very high |
| April Weather | 25°C (77°F) | 1 mm (0.0 inches) | 51% | extreme |
| May Weather | 28°C (82°F) | 0 mm (0.0 inches) | 47% | extreme |
| June Weather | 30°C (87°F) | 27 mm (1.1 inches) | 50% | extreme |
| July Weather | 29°C (85°F) | 117 mm (4.6 inches) | 70% | extreme |
| August Weather | 29°C (85°F) | 124 mm (4.9 inches) | 81% | extreme |
| September Weather | 28°C (83°F) | 103 mm (4.0 inches) | 82% | extreme |
| October Weather | 27°C (81°F) | 24 mm (0.9 inches) | 78% | very high |
| November Weather | 23°C (74°F) | 39 mm (1.5 inches) | 78% | high |
| December Weather | 19°C (66°F) | 20 mm (0.8 inches) | 80% | high |