Tuesday, April 21, 2026 - Honolulu is serving up a warm, sticky afternoon, with mostly clear skies and temperatures near 72°F under light north winds. Expect the sunshine to dominate through the morning, then watch for afternoon heating to tug clouds inland and spark a few scattered, quick-hitting showers after lunchtime.
The National Weather Service is calling for a high near 83°F and about a 30% chance of showers late in the day. Any spot that does get wet should see less than a tenth of an inch of rain, and tonight’s low is expected to linger near 73°F, according to NWS Honolulu. South-southeast breezes will stay on the light side today before veering to the east-southeast overnight.
Afternoon Showers And Inland Clouds
A gentle land-and-sea-breeze pattern will nudge isolated showers over interior and mauka spots during peak afternoon heating, with brief downpours possible near ridgelines and in gullies. Any burst of rain should be short-lived, but drivers on mauka routes could run into slick pavement during the heavier showers. Skies should start to partially clear again after sunset.
Trades Return Later This Week
Trade winds are expected to redevelop late Wednesday, then strengthen Thursday and Friday, ushering in drier air and breezier northeast flow that will push most showers back onto windward slopes. For a refresher on how this recent muggy stretch set up, check out this look at sticky skies and sneaky showers.
Surf And Boating Notes
A small, medium-period northwest swell will give a modest boost to surf along north and west-facing shores today, while a moderate north-northeast swell moves in and peaks on Wednesday, lifting surf there to moderate heights. East-facing beaches remain on the smaller side for now but should creep back toward typical seasonal levels as the trades strengthen later this week. Boaters are advised to keep an eye on channel conditions and be ready for increasingly choppy water.
No watches or warnings are currently posted for Oʻahu, but the forecast is always subject to change, so double-check conditions before heading out or locking in outdoor plans. Keep a NOAA Weather Radio or the NWS Honolulu page close at hand in case anything shifts in a hurry.
