Last updated today at 06:13. Forecast - Oceanside (CA) Day by day forecast . Oceanside - CA Weather Forecast. 14 day weather for Oceanside, California, United States Of America, giving an extended long range forecast outlook Weather warnings issued. Be prepared with the most accurate 10-day forecast for Oceanside, CA with highs, lows, chance of precipitation from The Weather Channel and Access detailed hourly and 14 day forecasts, current conditions, maps, warnings, meteograms, historical data and more for Oceanside Date Weather Pre. Oceanside Weather 14 Day. The professional 14 day weather trend for Oceanside. This website uses cookies. Showing the uncertainty and reliability of the weather forecast. OK Comments Membership info Register new Login Read about how we use cookies. Oceanside (CA) - Weather warnings issued 14-day forecast. Weather Underground provides local & long-range weather forecasts, weatherreports, maps & tropical weather conditions for the Oceanside area. Oceanside Weather Forecasts. 5 days, 7 days, 10 day, 14 days, 15 days, 16 days, 25 days, 30 days, 45 days, 60 days, 90 days. Hi.