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.
Local Context And What To Watch
After days of passing showers, soils and streams are already running high across much of the island, which means even short, intense bursts of rain can turn into fast-moving runoff and force the closure of low water crossings. Forecasters say the rain bands may drift back west toward Kauaʻi tonight, while the Big Island stays comparatively quiet aside from the usual upslope showers. For background on the setup that led to this soggy stretch and earlier forecasts, see our April 5 coverage Soupy Skies And Street Floods.
How To Stay Safe Today
Officials are repeating the classic advice for days like this: avoid driving through standing water and never attempt to cross flooded roads. Turn around, do not drown. If flooding threatens your home or neighborhood, move to higher ground and call 9-1-1 only if you are in immediate danger. Otherwise, keep an eye on county alerts and updates from the National Weather Service. Make sure phones are charged, postpone nonessential trips during the heaviest bands, and have a backup route in mind in case your usual roads get washed out.
