Last updated: June 24, 2025
In Hayward, United States, the average temperature in April hovers around 4°C (40°F). Expect a wide temperature range, with minimums plummeting to -17°C (1°F) and maximums soaring to 28°C (82°F). You'll want to be prepared for moisture as well, with 88 mm (3.5 in) of precipitation spread over approximately 11 days. Humidity levels can be quite high, averaging around 85%, making for a distinctly chilly and damp atmosphere.
In April in Hayward, the average temperature is 4°C (40°F), with maximums potentially reaching 28°C (82°F) and minimums dropping as low as -17°C (1°F). Travelers should be prepared for a wide range of temperatures, ensuring they pack layers for both warm afternoons and chilly evenings.
In Hayward in April, the total precipitation amount is 88 mm (3.5 in) spread over 11 days.
In Hayward in April, humidity is 85%. With an average temperature of 4°C (40°F), this humidity feels like an icy blanket wrapping around you, making outdoor activities feel much colder and damp, which can be quite uncomfortable for traveling.
In Hayward in April, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the 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 April’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 |