Last updated: June 24, 2025
In Rancho San Diego, United States, the average temperature in May is a pleasant 17°C (63°F). You can expect a minimum of 9°C (49°F) and a maximum soaring up to 30°C (87°F). With an average humidity of 46%, conditions are generally comfortable. However, be prepared for 21 mm (0.8 in) of precipitation spread over 4 days. Stay prepared and enjoy your time!
In May in Rancho San Diego, the average temperature is 17°C (63°F). Maximum temperatures can reach up to 30°C (87°F), while minimums can dip as low as 9°C (49°F). This pleasant climate makes Rancho San Diego an ideal destination for travelers seeking mild weather during this time.
In Rancho San Diego in May, the precipitation amount is 21 mm (0.8 in) over a span of 4 days.
In Rancho San Diego in May, humidity is 46%. With an average temperature of 17°C (63°F), this humidity feels like a mild embrace—comfortable for exploring the sights, though you might notice a slight heaviness in the air that encourages a leisurely pace as you take in the vibrant surroundings.
In Rancho San Diego in May, the maximum UV index reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, you can check the Hourly UV Index in Rancho San Diego.
UV Risk Categories
Weather in Rancho San Diego varies notably across the year, with each month offering distinct climate conditions. This page compares May’s weather to other months in Rancho San Diego, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 13°C (56°F) | 56 mm (2.2 inches) | 72% | moderate |
| February Weather | 13°C (56°F) | 68 mm (2.7 inches) | 77% | high |
| March Weather | 14°C (57°F) | 51 mm (2.0 inches) | 67% | very high |
| April Weather | 16°C (61°F) | 24 mm (0.9 inches) | 56% | very high |
| May Weather | 17°C (63°F) | 21 mm (0.8 inches) | 46% | extreme |
| June Weather | 19°C (67°F) | 2 mm (0.1 inches) | 48% | extreme |
| July Weather | 22°C (72°F) | 3 mm (0.1 inches) | 46% | extreme |
| August Weather | 23°C (74°F) | 1 mm (0.1 inches) | 42% | very high |
| September Weather | 22°C (72°F) | 4 mm (0.1 inches) | 52% | very high |
| October Weather | 20°C (68°F) | 14 mm (0.6 inches) | 58% | high |
| November Weather | 17°C (62°F) | 29 mm (1.1 inches) | 66% | moderate |
| December Weather | 14°C (57°F) | 65 mm (2.5 inches) | 74% | moderate |