Last updated: June 24, 2025
In May, the average temperature in Fontana, United States hovers around 15°C (60°F). However, be prepared for a range, as temperatures can dip to a chilly -1°C (30°F) or soar up to a sweltering 34°C (93°F). During this time, expect approximately 154 mm (6.0 in) of precipitation spread over 14 days, contributing to an average humidity of 78%. Stay comfortable and plan ahead for varied weather conditions!
In May in Fontana, the average temperature is 15°C (60°F). The maximum can reach 34°C (93°F), while the minimum can drop as low as -1°C (30°F). This diverse temperature range makes Fontana an interesting destination for travelers, offering the opportunity to enjoy both warm and cool weather experiences.
In Fontana in May, the precipitation amount is 154 mm (6.0 in) over the course of 14 days.
In Fontana in May, humidity is 78%. With an average temperature of 15°C (60°F), this humidity feels like a warm, damp embrace that can make outdoor activities a bit uncomfortable, highlighting the importance of staying hydrated and taking breaks in the shade while exploring.
In Fontana in May, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Fontana.
UV Risk Categories
Weather in Fontana varies notably across the year, with each month offering distinct climate conditions. This page compares May’s weather to other months in Fontana, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -5°C (23°F) | 61 mm (2.4 inches) | 85% | moderate |
| February Weather | -4°C (25°F) | 58 mm (2.3 inches) | 85% | moderate |
| March Weather | 3°C (37°F) | 66 mm (2.6 inches) | 85% | high |
| April Weather | 8°C (47°F) | 110 mm (4.3 inches) | 85% | very high |
| May Weather | 15°C (60°F) | 154 mm (6.0 inches) | 78% | very high |
| June Weather | 21°C (71°F) | 115 mm (4.5 inches) | 80% | very high |
| July Weather | 24°C (75°F) | 84 mm (3.3 inches) | 78% | very high |
| August Weather | 22°C (72°F) | 91 mm (3.6 inches) | 76% | very high |
| September Weather | 19°C (66°F) | 104 mm (4.1 inches) | 79% | very high |
| October Weather | 11°C (53°F) | 119 mm (4.7 inches) | 83% | moderate |
| November Weather | 3°C (37°F) | 49 mm (1.9 inches) | 88% | moderate |
| December Weather | -1°C (31°F) | 52 mm (2.1 inches) | 81% | low |