Last updated: August 27, 2025
In May, the average temperature in San Francisco, Mexico hovers around 25°C (78°F), providing a pleasant climate for visitors. However, temperatures can vary significantly, with a minimum of 16°C (60°F) and a scorching maximum reaching 37°C (98°F). During this month, expect 185 mm (7.3 in) of precipitation spread across approximately 17 days, contributing to an average humidity of 82%. Ensure to prepare accordingly if you're planning a trip!
In May in San Francisco, the average temperature is 25°C (78°F). The maximum can reach 37°C (98°F), and the minimum can be as low as 16°C (60°F). This pleasant climate makes San Francisco an ideal destination for travelers seeking warmth and sunshine during the May.
In San Francisco in May, the precipitation amount is 185 mm (7.3 in), which occurs over a span of 17 days.
In San Francisco in May, humidity is 82%. With an average temperature of 25°C (78°F), this humidity feels like a warm, heavy blanket wrapping around you, making outdoor activities a bit more challenging and encouraging you to seek shade or a cool spot during your travels.
In San Francisco in May, the maximum UV index reaches 13, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's crucial to take protective measures. For detailed information, you can check the Hourly UV Index in San Francisco.
UV Risk Categories
Weather in San Francisco varies notably across the year, with each month offering distinct climate conditions. This page compares May’s weather to other months in San Francisco, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 17°C (63°F) | 92 mm (3.6 inches) | 88% | very high |
| February Weather | 19°C (66°F) | 79 mm (3.1 inches) | 86% | extreme |
| March Weather | 21°C (70°F) | 112 mm (4.4 inches) | 83% | extreme |
| April Weather | 23°C (74°F) | 117 mm (4.6 inches) | 80% | extreme |
| May Weather | 25°C (78°F) | 185 mm (7.3 inches) | 82% | extreme |
| June Weather | 25°C (78°F) | 210 mm (8.3 inches) | 79% | extreme |
| July Weather | 25°C (77°F) | 141 mm (5.5 inches) | 72% | extreme |
| August Weather | 25°C (78°F) | 191 mm (7.5 inches) | 74% | extreme |
| September Weather | 25°C (77°F) | 212 mm (8.4 inches) | 84% | extreme |
| October Weather | 23°C (74°F) | 287 mm (11.3 inches) | 92% | extreme |
| November Weather | 20°C (68°F) | 127 mm (5.0 inches) | 91% | very high |
| December Weather | 18°C (64°F) | 62 mm (2.4 inches) | 91% | high |