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Kauai Weather

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Waimea, Kauai Weather

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Today

90° F
Sunny
Wind 9 to 14 mph E

Tonight

73° F
Partly Cloudy
Wind 3 to 9 mph ENE

Friday

90° F
Mostly Sunny
Wind 3 to 16 mph ENE

Friday Night

73° F
Partly Cloudy
Wind 10 mph ENE

Saturday

89° F
Mostly Sunny
Wind 12 mph ENE

Saturday Night

73° F
Partly Cloudy
Wind 7 to 10 mph ENE

Sunday

88° F
Partly Sunny then Isolated Rain Showers
Wind 8 mph ENE

Sunday Night

73° F
Mostly Cloudy
Wind 8 mph ENE

Monday

88° F
Partly Sunny then Isolated Rain Showers
Wind 2 to 6 mph ENE

Monday Night

72° F
Mostly Cloudy
Wind 6 mph NE

Tuesday

89° F
Mostly Sunny then Isolated Rain Showers
Wind 6 mph ENE

Tuesday Night

73° F
Partly Cloudy
Wind 6 mph ENE

Wednesday

89° F
Mostly Sunny then Isolated Rain Showers
Wind 7 mph ENE

Wednesday Night

73° F
Partly Cloudy
Wind 6 to 10 mph ENE
Cloud Weather Radar

Regional Kauai Weather Forecast October 23, 2025


no slideshow
Photo Credit: Pascal Debrunner

West Kaua’i

Tonight: Partly cloudy. Breezy. Scattered showers in the evening, then isolated showers after midnight. Lows 70 to 75 near the shore to around 62 above 3000 feet. Northeast winds up to 20 mph. Chance of rain 50 percent.

Thursday: Sunny and breezy. Isolated showers in the morning. Highs 86 to 91 near the shore to around 77 above 3000 feet. East winds up to 20 mph. Chance of rain 20 percent.

Thursday Night: Partly cloudy. Isolated showers in the evening, then scattered showers after midnight. Lows around 73 near the shore to around 63 above 3000 feet. Northeast winds up to 15 mph. Chance of rain 50 percent.

South Kaua’i

Tonight: Breezy. Mostly cloudy with scattered showers. Lows around 74. Northeast winds 15 to 20 mph. Chance of rain 50 percent.

Thursday: Breezy. Partly sunny with scattered showers in the morning, then mostly sunny with isolated showers in the afternoon. Highs 82 to 90. Northeast winds 15 to 25 mph. Chance of rain 40 percent.

Thursday Night: Mostly cloudy. Scattered showers in the evening, then numerous showers after midnight. Lows around 74. Northeast winds around 15 mph. Chance of rain 70 percent.

Kaua’i Mountains

Tonight: Breezy. Mostly cloudy with numerous showers. Lows 64 to 70 in the valleys to around 60 above 4000 feet. East winds up to 20 mph. Chance of rain 70 percent.

Thursday: Partly sunny in the morning then becoming mostly sunny. Breezy. Scattered showers. Highs 75 to 84 in the valleys to around 66 above 4000 feet. East winds up to 20 mph increasing to 10 to 25 mph in the afternoon. Chance of rain 50 percent.

Thursday Night: Mostly cloudy. Breezy. Scattered showers in the evening, then numerous showers after midnight. Lows 65 to 71 in the valleys to around 60 above 4000 feet. East winds 10 to 20 mph. Chance of rain 70 percent.

North Kaua’i

Tonight: Mostly cloudy with numerous showers. Lows 65 to 74. East winds up to 15 mph. Chance of rain 70 percent.

Thursday: Mostly sunny. Scattered showers in the morning, then isolated showers in the afternoon. Highs 77 to 89. East winds up to 15 mph increasing to 10 to 15 mph in the afternoon. Chance of rain 50 percent.

Thursday Night: Partly cloudy with scattered showers. Lows 66 to 74. East winds 10 to 15 mph. Chance of rain 50 percent.

East Kaua’i

Tonight: Mostly cloudy with numerous showers. Lows 66 to 78. Northeast winds 10 to 15 mph. Chance of rain 70 percent.

Thursday: Breezy. Partly sunny with scattered showers in the morning, then mostly sunny with isolated showers in the afternoon. Highs 74 to 86. Northeast winds 10 to 20 mph. Chance of rain 50 percent.

Thursday Night: Mostly cloudy. Scattered showers in the evening, then numerous showers after midnight. Lows 66 to 78. Northeast winds 10 to 15 mph. Chance of rain 70 percent.

Detailed Forecast

Update

The surf forecast has been updated this evening and a High Surf Advisory (HSA) has been issued for north and west facing shores of Kauai, Niihau, Oahu, Molokai and north facing shores of Maui through 6 PM HST Thursday. The latest offshore buoy 51001 observations are showing slightly higher NNW long period swell energy moving into the Hawaii region that will swiftly build surf heights along north and west facing shores just above HSA thresholds. This moderate, medium period NNW (330) swell will peak later tonight keeping surf heights just above the HSA thresholds through Thursday afternoon before falling below HSA thresholds by Thursday night.

Synopsis

Breezy trade winds will become locally windy Friday into the weekend as high pressure north of the state strengthens and moves eastward. Showers will favor windward and mauka areas, and occasionally spill over to interior and leeward areas. Pockets of drier air filtering into the region, coinciding with the stronger winds, will introduce fire weather concerns Friday and Saturday. By early next week, trades will weaken slightly and rain chances will potentially increase, but forecast confidence remains low due to differing model solutions.

Aviation

Moderate to breezy trades will persist through Thursday, and stability will increase as a mid-level trough currently over the Big Island is pushed eastward by a developing mid level ridge. Small pockets of moisture moving along the trade wind flow will produce isolated MVFR conditions along windward slopes overnight, most likely on Big Island, while VFR will prevail elsewhere. AIRMET Tango will remain in place for low-level turbulence over and downwind of terrain. A separate AIRMET Tango for turbulence between FL220 and FL300 over Big Island and Maui should be dropped by evening as the mid-level ridge builds overhead.
Stronger trades and increasingly stable conditions are expected Friday.

Marine

High pressure established north of the islands maintains locally strong trades that will gradually strengthen during the latter portion of the week. The Small Craft Advisory remains in effect for the typical windy waters around the Big Island and Maui County and has been extended through Saturday. An expansion in coverage is possible late this week as winds near 25 kt over a greater area and seas approach 10 ft over the waters.
A moderate, medium period NNW (330) swell is building today and is forecast to peak tonight bringing surf near the High Surf Advisory (HSA) threshold late tonight into early Thursday. Swell then briefly subsides Thursday into Thursday night only to be followed by renewed long period energy from a larger and slightly more NNW (340) swell that will peak Friday into Saturday. Given that the present swell is already running above GFS guidance, adjusted this weekend's NNW swell upward a couple of feet closer to ECMWF wave guidance. This swell therefore holds a higher probability of exceeding HSA thresholds for N and W facing shores Fri into Sat.
Background medium to long period S to SSW swells will filter into the area through the week keeping surf along S facing shores from going flat. Rough, choppy surf along E shores will continue through the forecast period and will see a slight increase during the second half of the week into the weekend.

Prev discussion

/ISSUED 400 PM HST Wed Oct 22 2025/
This afternoon, broad surface high pressure is located far northwest of the main Hawaiian Islands, and is driving locally breezy trade winds across the state. In the upper levels, elongated troughing extends from near a strong upper low over Southern California to near the Hawaiian Islands. Local radar and GOES-West satellite imagery show a few clouds and showers embedded within the breezy trades moving into windward and mauka areas of the islands, though observed rainfall totals today from across the state show that most areas have been relatively dry (save for windward and mauka sites on primarily Kauai). Typical afternoon sea-breeze convergence along the Kona slopes of the Big Island have also increased low clouds and introduced scattered showers there as well.
Tonight through early Thursday, most model guidance (including the WRF-ARW, WRF-FV3, ECMWF, GFS, and even the experimental HRRR- HI) all depict some variation of increasing moisture and enhanced windward and mauka showers. This is especially notable in the models for the north and east sections of the Big Island, where a cluster of clouds and showers that is located near 21N 151W as of 0100 UTC is forecast to move closer to the upper troughing as it approaches. This area appears rather unimpressive on current satellite imagery this afternoon, however, casting at least some skepticism on if this will actually materialize during the early morning hours. Regardless, have trended early morning windward shower chances slightly upward with this afternoon's forecast updates based on the latest model trends. Additionally, there is potential for isolated thunderstorms for the Big Island on Thursday afternoon when models show the coolest temperatures aloft as the upper trough lingers near the east end of the state.
The surface high pressure to the northwest of the state that is driving the locally breezy trades today will gradually strengthen and slide eastward along 30N through the weekend. As it does so, the local pressure gradient will strengthen and thereby result in an upward trend in trade winds for the next couple of days. The trades are forecast to be strongest Friday into Saturday, with some windier areas potentially flirting with Wind Advisory criteria (sustained wind speeds 30 mph) during that time. Meanwhile, guidance also continues to show a brief period of drier air filtering in across the area during the day on Thursday, followed by a plume of moisture overnight, and another pocket of drier air Friday through the weekend. While relative humidity values may be borderline, confidence is increasing that there is potential for critical fire weather thresholds to be met on both Friday and Saturday as the increased trade wind speeds corresponds with the arrival of drier air. Therefore, a Fire Weather Watch has been issued for central and leeward zones of the islands, in addition to the Big Island North zone where extreme drought is occurring, from Friday morning through Saturday afternoon, though the main concern will be from late morning through the afternoon hours each day when relative humidities will be at their lowest. See the Fire Weather section below for more details.
Model guidance is in decent agreement in that an upper level low will break free from its parent trough over the weekend and retrograde westward near to or over the island chain. However, global models differ on both the placement and timing of the upper low from late weekend into early next week, decreasing forecast confidence. For now, have maintained a moderate to locally breezy trade wind pattern Sunday into early next week as the high pushes further to the east and weakens, with a slightly wetter trade wind pattern Monday into Tuesday to reflect overall model trends.
AVIATION… Moderate to breezy trades will persist through Thursday, and stability will increase as a mid-level trough currently over the Big Island is pushed eastward by a developing mid level ridge. Small pockets of moisture moving along the trade wind flow will produce isolated MVFR conditions along windward slopes overnight, most likely on Big Island, while VFR will prevail elsewhere. AIRMET Tango will remain in place for low-level turbulence over and downwind of terrain. A separate AIRMET Tango for turbulence between FL220 and FL300 over Big Island and Maui should be dropped by evening as the mid-level ridge builds overhead.
Stronger trades and increasingly stable conditions are expected Friday.
MARINE… High pressure established north of the islands maintains locally strong trades that will gradually strengthen during the latter portion of the week. The Small Craft Advisory remains in effect for the typical windy waters around the Big Island and Maui County and has been extended through Saturday. An expansion in coverage is possible late this week as winds near 25 kt over a greater area and seas approach 10 ft over the waters.
A moderate, medium period NNW (330) swell is building today and is forecast to peak tonight bringing surf near the High Surf Advisory (HSA) threshold late tonight into early Thursday. Swell then briefly subsides Thursday into Thursday night only to be followed by renewed long period energy from a larger and slightly more NNW (340) swell that will peak Friday into Saturday. Given that the present swell is already running above GFS guidance, adjusted this weekend's NNW swell upward a couple of feet closer to ECMWF wave guidance. This swell therefore holds a higher probability of exceeding HSA thresholds for N and W facing shores Fri into Sat.
Background medium to long period S to SSW swells will filter into the area through the week keeping surf along S facing shores from going flat. Rough, choppy surf along E shores will continue through the forecast period and will see a slight increase during the second half of the week into the weekend.

HFO Watches/Warnings/Advisories

High Surf Advisory until 6 PM HST Thursday for Niihau, Kauai Leeward, Waianae Coast, Oahu North Shore, Maui Windward West, Kauai North, Molokai Windward, Molokai North, Molokai West, Maui Central Valley North, Windward Haleakala.
Fire Weather Watch from Friday morning through Saturday afternoon for Niihau, Kauai South, Kauai Southwest, East Honolulu, Honolulu Metro, Ewa Plain, Waianae Coast, Oahu North Shore, Central Oahu, Waianae Mountains, Molokai North, Molokai West, Molokai Leeward South, Lanai Windward, Lanai Leeward, Lanai South, Lanai Mauka, Kahoolawe, Maui Leeward West, Maui Central Valley North, Maui Central Valley South, South Maui/Upcountry, South Haleakala, Big Island South, Big Island Southeast, Big Island North, Kohala, Big Island Interior.
Small Craft Advisory until 6 PM HST Saturday for Maalaea Bay, Pailolo Channel, Alenuihaha Channel, Big Island Leeward Waters, Big Island Southeast Waters.

Kauai Now Weather is brought to you by Blue Hawaiian Helicopters.

Data Courtesy of NOAA.gov

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