Monthly outlook for Waipio Acres, HI: average high 82.3°, average low 73.7°. That is 0° above the climate normal for August. Precipitation is expected on 8 days (about 0.6 inches), against a normal of 4 days and 0.5 inches. The warmest day looks like 18 August (86.8°), the coolest 18 August (72.2°).
82.3°/73.7°
Average high / low
+0°
Above normal
8 / 4
Wet days / normal
0.6 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
9 August – 18 August
82.6°
82.2°
+0.2°
19 August – 28 August
81.9°
82.3°
-0.3°
29 August – 7 September
at normal
82.5°
—
August records over 66 years
90.3°8 August 2019All-time high
66.4°31 August 2021All-time low
Climate normals and records are computed from the nearest reference point — Mililani Town (2 mi).
Mon, 1084° / 74°0
84 °
Waipio Acres, Monday, 10 August
Light rain. High 84°, low 74°.
Pressure29.97 inHg
Wind10.9 mph NE
Humidity59%
Visibility6.2 mi
Dew point68°
Tue, 1183° / 73°0
83 °
Waipio Acres, Tuesday, 11 August
Overcast. High 83°, low 73°.
Pressure29.97 inHg
Wind9.7 mph E
Humidity57%
Visibility6.2 mi
Dew point66°
Wed, 1282° / 74°0.02
82 °
Waipio Acres, Wednesday, 12 August
Light rain. High 82°, low 74°.
Pressure29.97 inHg
Wind11.1 mph E
Humidity55%
Visibility6.2 mi
Dew point64°
Thu, 1382° / 73°0.02
82 °
Waipio Acres, Thursday, 13 August
Light rain. High 82°, low 73°.
Pressure29.97 inHg
Wind14.5 mph NE
Humidity59%
Visibility—
Dew point65°
Fri, 1482° / 73°0
82 °
Waipio Acres, Friday, 14 August
Partly cloudy. High 82°, low 73°.
Pressure29.97 inHg
Wind15.3 mph NE
Humidity62%
Visibility—
Dew point65°
Sat, 1582° / 73°0
82 °
Waipio Acres, Saturday, 15 August
Light rain. High 82°, low 73°.
Pressure29.97 inHg
Wind14.5 mph NE
Humidity56%
Visibility—
Dew point63°
Sun, 1678° / 74°0.15
78 °
Waipio Acres, Sunday, 16 August
Light rain. High 78°, low 74°.
Pressure29.91 inHg
Wind10.8 mph N
Humidity80%
Visibility—
Dew point70°
Mon, 1786° / 74°0.05
86 °
Waipio Acres, Monday, 17 August
Light rain. High 86°, low 74°.
Pressure29.94 inHg
Wind10.2 mph S
Humidity60%
Visibility—
Dew point68°
Tue, 1887° / 72°0.02
87 °
Waipio Acres, Tuesday, 18 August
Light rain. High 87°, low 72°.
Pressure30.00 inHg
Wind4.8 mph E
Humidity50%
Visibility—
Dew point63°
Wed, 1983° / 74°0.05
83 °
Waipio Acres, Wednesday, 19 August
Light rain. High 83°, low 74°.
Pressure30.00 inHg
Wind10.2 mph E
Humidity59%
Visibility—
Dew point65°
Thu, 2083° / 74°0.06
83 °
Waipio Acres, Thursday, 20 August
Light rain. High 83°, low 74°.
Pressure30.03 inHg
Wind11.9 mph E
Humidity64%
Visibility—
Dew point67°
Fri, 2183° / 76°0.1
83 °
Waipio Acres, Friday, 21 August
Light rain. High 83°, low 76°.
Pressure30.03 inHg
Wind13.2 mph E
Humidity74%
Visibility—
Dew point71°
Sat, 2282° / 74°0.06
82 °
Waipio Acres, Saturday, 22 August
Light rain. High 82°, low 74°.
Pressure30.03 inHg
Wind17.3 mph E
Humidity70%
Visibility—
Dew point69°
Sun, 2381° / 73°0.04
81 °
Waipio Acres, Sunday, 23 August
Light rain. High 81°, low 73°.
Pressure30.03 inHg
Wind17.9 mph NE
Humidity61%
Visibility—
Dew point65°
Mon, 2481° / 74°0.05
81 °
Waipio Acres, Monday, 24 August
Light rain. High 81°, low 74°.
Pressure29.97 inHg
Wind14.6 mph NE
Humidity65%
Visibility—
Dew point67°
From day 17 onward the outlook is built from 60-year climate statistics
Tue, 2582° / 74°0.03
82 °
Waipio Acres, Tuesday, 25 August
Climate normal for this date — 60-year average.
Average high82°
Average low74°
Average precipitation0.03 in
Chance of precipitation17%
Record high88° (2025)
Record low69° (2025)
Wed, 2682° / 74°0.03
82 °
Waipio Acres, Wednesday, 26 August
Climate normal for this date — 60-year average.
Average high82°
Average low74°
Average precipitation0.03 in
Chance of precipitation27%
Record high88° (2019)
Record low70° (2025)
Thu, 2782° / 74°0.03
82 °
Waipio Acres, Thursday, 27 August
Climate normal for this date — 60-year average.
Average high82°
Average low74°
Average precipitation0.03 in
Chance of precipitation22%
Record high88° (2019)
Record low70° (2024)
Fri, 2883° / 74°0.03
83 °
Waipio Acres, Friday, 28 August
Climate normal for this date — 60-year average.
Average high83°
Average low74°
Average precipitation0.03 in
Chance of precipitation28%
Record high89° (2019)
Record low69° (2024)
Sat, 2983° / 74°0.02
83 °
Waipio Acres, Saturday, 29 August
Climate normal for this date — 60-year average.
Average high83°
Average low74°
Average precipitation0.02 in
Chance of precipitation20%
Record high89° (2019)
Record low69° (2025)
Sun, 3083° / 74°0.03
83 °
Waipio Acres, Sunday, 30 August
Climate normal for this date — 60-year average.
Average high83°
Average low74°
Average precipitation0.03 in
Chance of precipitation28%
Record high89° (2023)
Record low68° (2025)
Mon, 3182° / 74°0.04
82 °
Waipio Acres, Monday, 31 August
Climate normal for this date — 60-year average.
Average high82°
Average low74°
Average precipitation0.04 in
Chance of precipitation33%
Record high89° (2019)
Record low66° (2021)
Tue, 0182° / 74°0.04
82 °
Waipio Acres, Tuesday, 1 September
Climate normal for this date — 60-year average.
Average high82°
Average low74°
Average precipitation0.04 in
Chance of precipitation38%
Record high88° (2019)
Record low68° (2021)
Wed, 0282° / 74°0.03
82 °
Waipio Acres, Wednesday, 2 September
Climate normal for this date — 60-year average.
Average high82°
Average low74°
Average precipitation0.03 in
Chance of precipitation32%
Record high88° (2020)
Record low68° (2025)
Thu, 0382° / 74°0.04
82 °
Waipio Acres, Thursday, 3 September
Climate normal for this date — 60-year average.
Average high82°
Average low74°
Average precipitation0.04 in
Chance of precipitation38%
Record high88° (2019)
Record low69° (2023)
Fri, 0482° / 74°0.04
82 °
Waipio Acres, Friday, 4 September
Climate normal for this date — 60-year average.
Average high82°
Average low74°
Average precipitation0.04 in
Chance of precipitation33%
Record high89° (2025)
Record low67° (2023)
Sat, 0583° / 74°0.03
83 °
Waipio Acres, Saturday, 5 September
Climate normal for this date — 60-year average.
Average high83°
Average low74°
Average precipitation0.03 in
Chance of precipitation35%
Record high89° (2023)
Record low68° (2023)
Sun, 0682° / 73°0.02
82 °
Waipio Acres, Sunday, 6 September
Climate normal for this date — 60-year average.
Average high82°
Average low73°
Average precipitation0.02 in
Chance of precipitation13%
Record high88° (2024)
Record low67° (2023)
Mon, 0783° / 74°0.02
83 °
Waipio Acres, Monday, 7 September
Climate normal for this date — 60-year average.
Average high83°
Average low74°
Average precipitation0.02 in
Chance of precipitation22%
Record high89° (2023)
Record low67° (2025)
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 Waipio Acres, 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 Waipio Acres, 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.