Last updated: June 24, 2025
In January, the average temperature in Hayward, United States hovers around -10°C (14°F), with extremes ranging from a brisk -33°C (-27°F) to a surprisingly mild 7°C (45°F). Expect 26 mm (1.0 in) of precipitation spread over 6 days, contributing to a notable average humidity of 88%. Be prepared for a cold and potentially damp experience!
In January in Hayward, the average temperature is -10°C (14°F). Maximum temperatures can reach 7°C (45°F), while minimums can drop as low as -33°C (-27°F). Travelers should be prepared for icy conditions and pack appropriate winter gear when visiting during this time.
In Hayward in January, the precipitation amount is 26 mm (1.0 in) over the course of 6 days.
In Hayward in January humidity is 88%. With an average temperature of -10°C (14°F), this humidity feels like an uncomfortable chill that penetrates your clothes, making it difficult to explore the area without bundling up in multiple layers. The dampness clings to your skin, intensifying the cold, and can quickly lead to discomfort for travelers venturing outside for extended periods.
In Hayward in January, the maximum UV index is 2, which corresponds to a low exposure category. With this level of UV radiation, the time to burn is approximately 45 minutes. To learn more about the hourly UV index in Hayward, you can visit Hourly UV Index in Hayward.
UV Risk Categories
Weather in Hayward varies notably across the year, with each month offering distinct climate conditions. This page compares January’s weather to other months in Hayward, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -10°C (14°F) | 26 mm (1.0 inches) | 88% | low |
| February Weather | -10°C (15°F) | 40 mm (1.6 inches) | 89% | moderate |
| March Weather | -2°C (29°F) | 49 mm (1.9 inches) | 86% | moderate |
| April Weather | 4°C (40°F) | 88 mm (3.5 inches) | 85% | high |
| May Weather | 13°C (56°F) | 104 mm (4.1 inches) | 79% | very high |
| June Weather | 19°C (67°F) | 94 mm (3.7 inches) | 80% | very high |
| July Weather | 22°C (71°F) | 100 mm (3.9 inches) | 80% | very high |
| August Weather | 20°C (68°F) | 113 mm (4.5 inches) | 78% | very high |
| September Weather | 16°C (61°F) | 104 mm (4.1 inches) | 80% | high |
| October Weather | 8°C (46°F) | 94 mm (3.7 inches) | 84% | moderate |
| November Weather | -1°C (31°F) | 46 mm (1.8 inches) | 89% | moderate |
| December Weather | -6°C (21°F) | 61 mm (2.4 inches) | 85% | low |