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Waipahu, Hawaii 7 Day Weather Forecast
Wx Forecast - Wx Discussion - Wx Aviation
NWS Forecast for Waipahu HI
National Weather Service Forecast for: Waipahu HI
Issued by: National Weather Service Honolulu, HI
Updated: 6:01 pm HST Jul 26, 2025
 
Overnight

Overnight: Mostly clear, with a low around 74. Light northwest wind.
Mostly Clear

Sunday

Sunday: Scattered showers after noon.  Mostly sunny, with a high near 87. Light and variable wind becoming north northeast around 5 mph in the afternoon.  Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.
Mostly Sunny
then
Scattered
Showers
Sunday
Night
Sunday Night: Isolated showers before midnight.  Partly cloudy, with a low around 75. East northeast wind around 6 mph.  Chance of precipitation is 20%.
Isolated
Showers then
Mostly Clear
Monday

Monday: Isolated showers.  Mostly sunny, with a high near 87. East wind 6 to 10 mph.  Chance of precipitation is 20%.
Isolated
Showers

Monday
Night
Monday Night: Isolated showers before midnight.  Partly cloudy, with a low around 75. East northeast wind 9 to 11 mph.  Chance of precipitation is 20%.
Isolated
Showers then
Mostly Clear
Tuesday

Tuesday: Sunny, with a high near 88. Breezy, with an east wind 11 to 15 mph, with gusts as high as 21 mph.
Sunny and
Breezy

Tuesday
Night
Tuesday Night: Mostly clear, with a low around 76. Breezy, with an east wind 13 to 16 mph, with gusts as high as 22 mph.
Mostly Clear
then Mostly
Clear and
Breezy
Wednesday

Wednesday: Sunny, with a high near 87. Breezy, with an east wind around 16 mph, with gusts as high as 22 mph.
Sunny and
Breezy

Wednesday
Night
Wednesday Night: Mostly clear, with a low around 76. Breezy, with an east wind 13 to 16 mph, with gusts as high as 22 mph.
Mostly Clear
and Breezy

Lo 74 °F Hi 87 °F Lo 75 °F Hi 87 °F Lo 75 °F Hi 88 °F Lo 76 °F Hi 87 °F Lo 76 °F

 

Overnight
 
Mostly clear, with a low around 74. Light northwest wind.
Sunday
 
Scattered showers after noon. Mostly sunny, with a high near 87. Light and variable wind becoming north northeast around 5 mph in the afternoon. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.
Sunday Night
 
Isolated showers before midnight. Partly cloudy, with a low around 75. East northeast wind around 6 mph. Chance of precipitation is 20%.
Monday
 
Isolated showers. Mostly sunny, with a high near 87. East wind 6 to 10 mph. Chance of precipitation is 20%.
Monday Night
 
Isolated showers before midnight. Partly cloudy, with a low around 75. East northeast wind 9 to 11 mph. Chance of precipitation is 20%.
Tuesday
 
Sunny, with a high near 88. Breezy, with an east wind 11 to 15 mph, with gusts as high as 21 mph.
Tuesday Night
 
Mostly clear, with a low around 76. Breezy, with an east wind 13 to 16 mph, with gusts as high as 22 mph.
Wednesday
 
Sunny, with a high near 87. Breezy, with an east wind around 16 mph, with gusts as high as 22 mph.
Wednesday Night
 
Mostly clear, with a low around 76. Breezy, with an east wind 13 to 16 mph, with gusts as high as 22 mph.
Thursday
 
Sunny, with a high near 87. Breezy, with an east wind 14 to 16 mph, with gusts as high as 22 mph.
Thursday Night
 
Partly cloudy, with a low around 76. East northeast wind around 14 mph, with gusts as high as 18 mph.
Friday
 
Sunny, with a high near 87. Breezy, with an east wind 15 to 20 mph, with gusts as high as 28 mph.
Friday Night
 
Mostly clear, with a low around 76. Breezy, with an east northeast wind around 18 mph, with gusts as high as 25 mph.
Saturday
 
Sunny, with a high near 87. Breezy, with an east northeast wind 17 to 20 mph, with gusts as high as 28 mph.

 

Forecast from NOAA-NWS for Waipahu HI.

Weather Forecast Discussion
295
FXHW60 PHFO 270153
AFDHFO

Area Forecast Discussion
National Weather Service Honolulu HI
353 PM HST Sat Jul 26 2025

.SYNOPSIS...
A weak surface trough will move through the state the next few
days and will bring an increase of clouds and scattered showers
on Sunday. With the lack of breezy trades and an increase of
humidities, temperatures will feel warmer than usual through at
least Monday. Expect trades to strengthen to breezy levels around
the middle of next week.

&&

.DISCUSSION...
A weak surface trough will slowly move through the state the next
few days and will bring an increase of moisture. CIMMS MIMIC
precipitable water show values of 1.6-1.8 inches just east of the
Big Island this afternoon and the latest Hilo sounding is showing
a value of 1.55 inches. As this plume of moisture continues to
increase over the Big Island this evening and tonight, we should
see an increase of rain mainly over windward Big Island tonight.
Stable conditions aloft, should keep rainfall intensities at
moderate levels and if anything the rainfall should be beneficial
to our ongoing drought conditions.

For Sunday, we should see the trough continue to drift westward
and will likely bring an increase of moisture to the rest of the
state. With the lighter trade winds in place, localized sea
breezes should develop across select leeward areas by mid day. Sea
breeze convergence should lead to an increase of clouds and
scattered showers Sunday afternoon across interior and leeward
areas. For areas that do not see any shower activity, with the
increase in humidities, temperatures will feel muggy.

There is good model agreement with high pressure building back in
to the northeast of the state early next week, which should allow
the trade winds to strengthen back to moderate to locally breezy
levels by midweek. At the same time, a drier airmass is expected
to return to the islands.

We are continuing to monitor the development of Invest 90C far
southeast of the state. Central Pacific Hurricane Center has
increased the probability of development and now has a high chance
of cyclone formation during the next 7 days. Even if a tropical
cyclone were to develop, there is good agreement within the global
ensemble members for it to stay south of the Hawaiian Islands.


&&

.AVIATION...
A surface trough just east of the Big Island will begin to move
through the state tonight, which will bring an increase of
showers over windward Big Island and windward Maui. Trade winds
will weaken a notch tonight into Sunday with gentle to moderate
trade winds expected through Sunday.

Predominately VFR conditions are expected to prevail, however periods
of MVFR conditions will be possible especially over PHTO tonight
as showers increase.

There are currently no AIRMETs in effect, but an AIRMET for
mountain obscurations will be possible tonight into Sunday as
showers increase over windward areas of the Big Island and Maui.



&&

.MARINE...
A weak trough just to the east of the islands will transit
through the area through the rest of the weekend then dissipate
early next week as high pressure north of the area strengthens.
Trade winds will stay gentle to locally fresh through Monday due
to the trough, then strengthen Tuesday to moderate to locally
strong levels with the strengthening high pressure. There is also
potential for a tropical disturbance to track south of the waters,
this could influence the trade winds speeds.

South facing shores will remain small through the weekend with
mainly medium period background energy. A storm force low east of
New Zealand has produced seas up to 40 feet per JSON satellite
observations, likely impacting the islands during the second half
of next week. Confidence has increased that this low will generate
a moderate to large long period south swell that may approach or
exceed the High Surf Advisory threshold as it peaks.

East facing shores will gradually decline this weekend as trade
winds weaken locally and upstream of the state. East shores should
then increase next week as trade wind speeds increase. Flat to
tiny surf expected along north facing shores through the week.

&&

.FIRE WEATHER...
An increase of humidities are expected over the next few days as a
weak surface trough passes through the state. Trade winds are
also expected to decrease on Sunday with localized sea breezes
developing during the late morning through the afternoon hours.
Trade winds are expected to restrengthen Tuesday into Wednesday,
with developing dry conditions returning across the state. This
could bring elevated fire weather concerns during the second half
of next week.


&&

.HFO WATCHES/WARNINGS/ADVISORIES...
None.

&&

$$


DISCUSSION...Kino
AVIATION...Kino
MARINE...Tsamous
FIRE WEATHER...Kino
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Forecast Discussion from: NOAA-NWS Script developed by: El Dorado Weather






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