Waipahu in Fall
In fall (September, October and November), Waipahu sees average daytime highs around 82°F and overnight lows near 73°F, with 3.9 in of rain over about 22 wet days across the season. It is the 2nd-warmest season and the 3rd-wettest season.
Over the season highs ease from about 83°F in early September to 78°F by late November. The sky is clear or mostly clear about 40% of the time across fall, and the air most often feels muggy.
Fall is Waipahu's 3rd-best season to visit on our travel score. Waipahu has little temperature swing across the year, so its calendar seasons blur — the season framing matters less here than for a place with four distinct seasons. For the whole year in context, see Waipahu's year-round climate.
- Avg daytime high
- 82°F
- 2nd-warmest season
- Avg overnight low
- 73°F
- Rainfall
- 3.9 in
- 22 wet days
- Avg wind
- 10 mph
- Travel score
- 6.7
- 3rd-best season
- Months
- Sep · Oct · Nov
Temperature in Waipahu in Fall
Over the season highs ease from about 83°F in early September to 78°F by late November.
A typical fall day in Waipahu reaches about 82°F and drops to 73°F overnight. The warmest of the three months is September, the coolest November.
Waipahu weather by month
How the three fall months (September, October and November) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°F) | Rainfall (inches) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 76° / 67° | 1.6 | 7.3 | 10.8 | 7.6 |
| Feb | 76° / 67° | 1.5 | 7 | 11.3 | 7.5 |
| Mar | 76° / 68° | 2.1 | 8.9 | 11.8 | 7.2 |
| Apr | 78° / 69° | 1.0 | 8.4 | 12.5 | 7.0 |
| May | 80° / 70° | 1.1 | 8 | 13 | 7.0 |
| Jun | 82° / 72° | 0.9 | 7.3 | 13.3 | 6.9 |
| Jul | 82° / 73° | 0.8 | 7.8 | 13.2 | 6.6 |
| Aug | 83° / 74° | 0.9 | 6.8 | 12.7 | 6.3 |
| Sep | 83° / 74° | 0.8 | 7 | 12.1 | 6.3 |
| Oct | 82° / 73° | 1.3 | 7.2 | 11.5 | 6.7 |
| Nov | 79° / 71° | 1.8 | 7.7 | 11 | 7.0 |
| Dec | 77° / 69° | 1.9 | 7.2 | 10.7 | 7.4 |
Cloud cover in Fall
The sky is clear or mostly clear about 40% of the time across fall.
Chance of precipitation in Fall
Waipahu gets around 3.9 in of rain over 22 wet days across fall. The line is the day-by-day chance of measurable precipitation.
Humidity in Fall
Most of fall feels muggy — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Fall
Winds average 10 mph across fall.
Sunrise & sunset in Fall
Daylight runs from about 12 h 24 min in early September to 10 h 48 min by late November. The lit band spans sunrise to sunset each day.
Solar energy in Fall
Average shortwave solar energy reaching the ground each day across fall, about 5.5 kWh/m².
Hazard calendar for Waipahu
In fall, Waipahu overlaps its pacific hurricane season. The full year is below, with each hazard's peak months called out.
Waipahu sits in the eastern Pacific hurricane zone; the season peaks August–September.
Is fall a good time to visit Waipahu?
Our two travel scores rate fall for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
fall is a reasonable time to visit Waipahu for sightseeing. The water and warmth also suit a beach or pool day.
What to pack for Waipahu in Fall
From fall's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In fall, Waipahu sees daytime highs around 82°F and nights near 73°F. Pack light clothes and sun protection. About 22 days see rain.
Sea temperature near Waipahu in Fall
The nearest coast averages about 80°F across fall — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea offshore is warmest in September at about 81°F and coldest in February near 76°F.
The water stays above 68°F all year — warm enough for a swim any month.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°F) | 76 | 76 | 76 | 76 | 77 | 78 | 79 | 80 | 81 | 80 | 79 | 77 |
| Comfort | Warm | Warm | Warm | Warm | Warm | Warm | Warm | Warm | Warm | Warm | Warm | Warm |
| Sea temperature (°F) | Comfort | |
|---|---|---|
| Jan | 76 | Warm |
| Feb | 76 | Warm |
| Mar | 76 | Warm |
| Apr | 76 | Warm |
| May | 77 | Warm |
| Jun | 78 | Warm |
| Jul | 79 | Warm |
| Aug | 80 | Warm |
| Sep | 81 | Warm |
| Oct | 80 | Warm |
| Nov | 79 | Warm |
| Dec | 77 | Warm |
UV index in Waipahu in Fall
Clear-sky midday UV across fall averages around 9 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Waipahu peaks around July 21 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 18 at about 6 (high).
The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 7 | 9 | 10 | 11 | 10 | 11 | 12 | 12 | 12 | 9 | 7 | 6 |
| Level | High | Very high | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Very high | High | High |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 7 | High |
| Feb | 9 | Very high |
| Mar | 10 | Extreme |
| Apr | 11 | Extreme |
| May | 10 | Extreme |
| Jun | 11 | Extreme |
| Jul | 12 | Extreme |
| Aug | 12 | Extreme |
| Sep | 12 | Extreme |
| Oct | 9 | Very high |
| Nov | 7 | High |
| Dec | 6 | High |
Where is Waipahu?
Waipahu sits at 21.4°N, 158.0°W, 62 ft above sea level, in United States. The nearest listed city is Pearl City, 2.5 mi away.
Topography around Waipahu
How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Waipahu.
Within 2 miles, the terrain around Waipahu has only modest variations in elevation — a maximum elevation change of 463 ft around an average of 115 ft above sea level; within 10 miles, large variations in elevation — a maximum elevation change of 3,025 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 3,983 ft.
The land around Waipahu is covered by artificial surfaces (38%) and grassland (28%) within 2 miles, trees (36%), grassland (23%) and water (23%) within 10 miles, and water (87%) within 50 miles.
United States travel facts
- Power plugs
- Type A / B
- 120 V · 60 Hz
- Prices
- ≈ 100% of US
- price level, 2025
- GDP per capita
- $90,027
- 2025
- Happiness
- 6.8 / 10
- World Happiness, 2025
- Safe drinking water
- 98%
- of population, 2024
- Homicide rate
- 5.8
- per 100k, 2023
- Road deaths
- 12.7
- per 100k/yr, 2019
- Income group
- High
- World Bank
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Waipahu (21.3867°, -158.0092°, elevation 62 ft), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google.