Monthly outlook for Waianae, HI: average high 83°, average low 77.3°. That is 0.8° above the climate normal for August. Precipitation is expected on 3 days (about 1.6 inches), against a normal of 4 days and 0.6 inches. The warmest day looks like 22 August (84.7°), the coolest 12 August (75.8°).
83°/77.3°
Average high / low
+0.8°
Above normal
3 / 4
Wet days / normal
1.6 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
8 August – 17 August
83°
81.5°
+0.8°
18 August – 27 August
83°
81.6°
+0.8°
28 August – 6 September
at normal
81.8°
—
August records over 66 years
88°11 August 2025All-time high
62.6°31 August 2021All-time low
Climate normals and records are computed from the nearest reference point — Schofield Barracks (8 mi).
Sun, 0984° / 77°0
84 °
Waianae, Sunday, 9 August
Partly cloudy. High 84°, low 77°.
Pressure30.00 inHg
Wind9.9 mph NE
Humidity68%
Visibility6.2 mi
Dew point71°
Mon, 1084° / 78°0
84 °
Waianae, Monday, 10 August
Mostly clear. High 84°, low 78°.
Pressure29.97 inHg
Wind10.3 mph NE
Humidity66%
Visibility6.2 mi
Dew point71°
Tue, 1184° / 77°0
84 °
Waianae, Tuesday, 11 August
Overcast. High 84°, low 77°.
Pressure29.94 inHg
Wind6.5 mph NE
Humidity59%
Visibility6.2 mi
Dew point67°
Wed, 1283° / 76°0
83 °
Waianae, Wednesday, 12 August
Mostly clear. High 83°, low 76°.
Pressure29.94 inHg
Wind7.5 mph E
Humidity57%
Visibility6.2 mi
Dew point65°
Thu, 1383° / 77°0
83 °
Waianae, Thursday, 13 August
Overcast. High 83°, low 77°.
Pressure29.94 inHg
Wind16.4 mph NE
Humidity62%
Visibility—
Dew point68°
Fri, 1483° / 77°0
83 °
Waianae, Friday, 14 August
Clear. High 83°, low 77°.
Pressure29.94 inHg
Wind17.9 mph NE
Humidity65%
Visibility—
Dew point68°
Sat, 1582° / 77°0.04
82 °
Waianae, Saturday, 15 August
Light rain. High 82°, low 77°.
Pressure29.94 inHg
Wind21.3 mph NE
Humidity73%
Visibility—
Dew point71°
Sun, 1679° / 77°1.39
79 °
Waianae, Sunday, 16 August
Heavy rain. High 79°, low 77°.
Pressure29.53 inHg
Wind39.1 mph N
Humidity90%
Visibility—
Dew point74°
Mon, 1784° / 78°0.05
84 °
Waianae, Monday, 17 August
Light rain. High 84°, low 78°.
Pressure30.00 inHg
Wind16.2 mph SE
Humidity73%
Visibility—
Dew point72°
Tue, 1882° / 78°0
82 °
Waianae, Tuesday, 18 August
Mostly clear. High 82°, low 78°.
Pressure30.06 inHg
Wind15.9 mph NE
Humidity69%
Visibility—
Dew point69°
Wed, 1981° / 77°0.02
81 °
Waianae, Wednesday, 19 August
Light rain. High 81°, low 77°.
Pressure30.03 inHg
Wind15.2 mph NE
Humidity74%
Visibility—
Dew point71°
Thu, 2083° / 76°0
83 °
Waianae, Thursday, 20 August
Clear. High 83°, low 76°.
Pressure30.00 inHg
Wind8.3 mph NE
Humidity62%
Visibility—
Dew point67°
Fri, 2183° / 77°0.04
83 °
Waianae, Friday, 21 August
Light rain. High 83°, low 77°.
Pressure30.00 inHg
Wind7.7 mph NE
Humidity70%
Visibility—
Dew point71°
Sat, 2285° / 78°0.03
85 °
Waianae, Saturday, 22 August
Light rain. High 85°, low 78°.
Pressure30.00 inHg
Wind10.3 mph E
Humidity73%
Visibility—
Dew point73°
Sun, 2385° / 79°0
85 °
Waianae, Sunday, 23 August
Overcast. High 85°, low 79°.
Pressure30.00 inHg
Wind11.9 mph E
Humidity66%
Visibility—
Dew point70°
From day 17 onward the outlook is built from 60-year climate statistics
Mon, 2482° / 73°0.07
82 °
Waianae, Monday, 24 August
Climate normal for this date — 60-year average.
Average high82°
Average low73°
Average precipitation0.07 in
Chance of precipitation32%
Record high85° (1996)
Record low66° (2022)
Tue, 2582° / 73°0.04
82 °
Waianae, Tuesday, 25 August
Climate normal for this date — 60-year average.
Average high82°
Average low73°
Average precipitation0.04 in
Chance of precipitation17%
Record high85° (1996)
Record low67° (2025)
Wed, 2681° / 73°0.04
81 °
Waianae, Wednesday, 26 August
Climate normal for this date — 60-year average.
Average high81°
Average low73°
Average precipitation0.04 in
Chance of precipitation28%
Record high85° (1996)
Record low67° (2021)
Thu, 2782° / 73°0.03
82 °
Waianae, Thursday, 27 August
Climate normal for this date — 60-year average.
Average high82°
Average low73°
Average precipitation0.03 in
Chance of precipitation25%
Record high85° (2019)
Record low65° (2024)
Fri, 2882° / 73°0.03
82 °
Waianae, Friday, 28 August
Climate normal for this date — 60-year average.
Average high82°
Average low73°
Average precipitation0.03 in
Chance of precipitation32%
Record high86° (2019)
Record low66° (2022)
Sat, 2982° / 73°0.02
82 °
Waianae, Saturday, 29 August
Climate normal for this date — 60-year average.
Average high82°
Average low73°
Average precipitation0.02 in
Chance of precipitation23%
Record high88° (2019)
Record low67° (2023)
Sun, 3082° / 73°0.03
82 °
Waianae, Sunday, 30 August
Climate normal for this date — 60-year average.
Average high82°
Average low73°
Average precipitation0.03 in
Chance of precipitation32%
Record high85° (2025)
Record low65° (2025)
Mon, 3182° / 73°0.04
82 °
Waianae, Monday, 31 August
Climate normal for this date — 60-year average.
Average high82°
Average low73°
Average precipitation0.04 in
Chance of precipitation33%
Record high86° (2019)
Record low63° (2021)
Tue, 0182° / 73°0.04
82 °
Waianae, Tuesday, 1 September
Climate normal for this date — 60-year average.
Average high82°
Average low73°
Average precipitation0.04 in
Chance of precipitation43%
Record high85° (2019)
Record low65° (2021)
Wed, 0282° / 73°0.03
82 °
Waianae, Wednesday, 2 September
Climate normal for this date — 60-year average.
Average high82°
Average low73°
Average precipitation0.03 in
Chance of precipitation33%
Record high85° (1997)
Record low66° (2025)
Thu, 0382° / 73°0.05
82 °
Waianae, Thursday, 3 September
Climate normal for this date — 60-year average.
Average high82°
Average low73°
Average precipitation0.05 in
Chance of precipitation42%
Record high86° (2019)
Record low66° (2018)
Fri, 0482° / 73°0.04
82 °
Waianae, Friday, 4 September
Climate normal for this date — 60-year average.
Average high82°
Average low73°
Average precipitation0.04 in
Chance of precipitation33%
Record high87° (2023)
Record low64° (2023)
Sat, 0582° / 73°0.03
82 °
Waianae, Saturday, 5 September
Climate normal for this date — 60-year average.
Average high82°
Average low73°
Average precipitation0.03 in
Chance of precipitation32%
Record high87° (2023)
Record low64° (2023)
Sun, 0682° / 73°0.02
82 °
Waianae, Sunday, 6 September
Climate normal for this date — 60-year average.
Average high82°
Average low73°
Average precipitation0.02 in
Chance of precipitation15%
Record high86° (2023)
Record low65° (2023)
About the monthly outlook
How accurate is a 30-day forecast?
The first 16 days come from weather models — reliable for the first 3–5 days and progressively less so after that. Days 17 through 30 for Waianae, HI are built from the climate normal, the 60-year average, so they show typical weather for those dates rather than a specific forecast.
What does "above normal" mean?
We compare the forecast against the climate normal for those exact calendar days, computed from 60 years of observations. The deviation shows how much the coming month differs from a typical one.
Where do the 66-year records come from?
They are real temperature extremes recorded in Waianae, HI since 1960: the highest and lowest reading for each calendar date, with the year it happened.
How often is it updated?
The forecast portion refreshes every hour; the climate portion is based on long-term data and stays stable.