Honolulu woke up to a soaking on Sunday as showers and thunderstorms rolled across Oʻahu, with a Flood Watch now blanketing the city through Monday, April 13, 2026, at 6:00 PM HST. Forecasters warn that some storms could unleash heavy downpours capable of flooding streets and cutting visibility to near zero. Highs will hover near 78°F with overnight lows around 71°F, and drivers should brace for slower commutes and sudden road closures when the rain really lets loose.
When And Where The Heaviest Rain Will Fall
An unstable band of tropical moisture is lining up to dump the heaviest rain over Oʻahu and Molokaʻi today and tonight, with new rainfall totals of 1 to 2 inches possible in just a few hours in some neighborhoods. The Flood Watch warns that flash flooding could quickly develop if thunderstorms stall over already saturated ground. According to the National Weather Service in Honolulu, the watch covers all islands and is expected to remain in effect through Monday afternoon…