Last updated: June 24, 2025
In Santa Rosa, United States, the average temperature in May hovers around 17°C (62°F), with a minimum that can dip to 3°C (39°F) and a maximum reaching up to 35°C (96°F). Expect some moisture, as the region sees about 27 mm (1.1 in) of precipitation over 3 days. With an average humidity level of 80%, it's a month where the air feels distinctly tropical!
In May in Santa Rosa, the average temperature is 17°C (62°F). The maximum can reach 35°C (96°F), while the minimum can be as low as 3°C (39°F). This variation makes it essential for travelers to pack accordingly, ensuring they are prepared for both warm and chilly conditions.
In Santa Rosa in May, the total precipitation amount is 27 mm (1.1 in) over the course of 3 days.
In Santa Rosa in May, humidity is 80%. With an average temperature of 17°C (62°F), this humidity feels like a heavy blanket wrapping around you, making travel sticky and uncomfortable, and often leaving you longing for a refreshing breeze.
In Santa Rosa in May, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Santa Rosa.
UV Risk Categories
Weather in Santa Rosa varies notably across the year, with each month offering distinct climate conditions. This page compares May’s weather to other months in Santa Rosa, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 9°C (49°F) | 139 mm (5.5 inches) | 86% | moderate |
| February Weather | 10°C (50°F) | 155 mm (6.1 inches) | 84% | moderate |
| March Weather | 11°C (52°F) | 97 mm (3.8 inches) | 83% | high |
| April Weather | 14°C (57°F) | 45 mm (1.8 inches) | 80% | very high |
| May Weather | 17°C (62°F) | 27 mm (1.1 inches) | 80% | very high |
| June Weather | 21°C (69°F) | 2 mm (0.1 inches) | 76% | extreme |
| July Weather | 22°C (71°F) | 0 mm (0.0 inches) | 70% | extreme |
| August Weather | 21°C (71°F) | 0 mm (0.0 inches) | 66% | very high |
| September Weather | 20°C (69°F) | 2 mm (0.1 inches) | 68% | very high |
| October Weather | 17°C (63°F) | 41 mm (1.6 inches) | 72% | high |
| November Weather | 12°C (54°F) | 58 mm (2.3 inches) | 84% | moderate |
| December Weather | 9°C (48°F) | 101 mm (4.0 inches) | 84% | moderate |