Wahiawā-Whitmore weather in September

In September, Wahiawā-Whitmore sees average daytime highs of 83°F and overnight lows near 74°F, with 0.8 in of rain across 7 wet days and about 12.1 hours of daylight. It is the 1st-warmest and 12th-wettest month of the year here.

Day-to-day highs hold fairly steady near 83°F through the month. The sky is clear or mostly clear about 45% of the time in September, and the air most often feels muggy.

Daylight stretches from about 12 h 24 min at the start of September to 11 h 48 min by month's end. Set against the rest of the year, September is Wahiawā-Whitmore's 2nd-clearest and 8th-windiest month. For the whole year in context, see Wahiawā-Whitmore's year-round climate.

Daytime high
83°
1st warmest
Overnight low
74°
11th coldest
Rainfall
0.8 in
7 wet days
Daylight
12 h 06 min
6:23 AM – 6:30 PM
Cloud cover
47%
2nd clearest
Wind
10 mph
8th windiest
Solar energy
6.44 kWh/m²
Travel score
6.3
out of 10

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 83°F through the month.

A typical September day in Wahiawā-Whitmore reaches about 83°F in the afternoon and slips back to 74°F overnight — a 9°F spread between the day's warmth and the night's chill. On most days the high lands between 81°F and 86°F. Set against its neighbours, September runs on par with August and on par with October.

65°70°75°80°85°151015202530
Avg high (°F)Avg low (°F)
18374
28374
38374
48374
58374
68374
78374
88374
98374
108374
118374
128374
138374
148374
158374
168374
178374
188374
198374
208374
218374
228374
238374
248374
258374
268374
278374
288374
298374
308374

Wahiawā-Whitmore weather by month

How September compares with the rest of the year at a glance. September is the 1st-warmest and 12th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysDaylight (hours)Travel score
Jan76° / 67°1.67.310.87.6
Feb76° / 67°1.5711.37.5
Mar76° / 68°2.18.911.87.2
Apr78° / 69°1.08.412.57.0
May80° / 70°1.18137.0
Jun82° / 72°0.97.313.36.9
Jul82° / 73°0.87.813.26.6
Aug83° / 74°0.96.812.76.3
Sep83° / 74°0.8712.16.3
Oct82° / 73°1.37.211.56.7
Nov79° / 71°1.87.7117.0
Dec77° / 69°1.97.210.77.4

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 45% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 30% of September, with mostly cloudy or overcast conditions the remaining 25%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
17426
27525
37525
47624
57624
67624
77624
87723
97723
107723
117723
127723
137723
147822
157822
167624
177624
187624
197624
207525
217525
227525
237426
247426
257327
267228
277129
287030
296931
306832

Chance of precipitation in September

Any precipitation

Wahiawā-Whitmore gets around 0.8 in of rain over 7 wet days in September, the driest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 24% and peaks near 25% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
122
222
322
423
523
623
723
824
924
1024
1124
1225
1325
1425
1525
1625
1725
1825
1925
2025
2124
2224
2323
2423
2523
2622
2722
2822
2922
3022

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

Most of September feels muggy — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, September lands in the muggy band about 72% of days. Sticky, muggy-or-worse air turns up on roughly 93% of them.

0%25%50%75%100%151015202530
Humid (%)Muggy (%)Oppressive (%)
167618
267618
367519
467519
567519
667420
777320
877221
977221
1077221
1177221
1277122
1377221
1477221
1577221
1677122
1777122
1887022
1987022
2087022
2187121
2287121
2377221
2477221
2577320
2677320
2777320
2877320
2977320
3077419

Wind in September

Winds average 10 mph in September.

Across September, daily wind ranges from about 10 mph on the calmest days to 11 mph at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (mph)Feels
111light breeze
211light breeze
311light breeze
411light breeze
511light breeze
611light breeze
711light breeze
811light breeze
911light breeze
1011light breeze
1111light breeze
1210light breeze
1310light breeze
1410light breeze
1510light breeze
1610light breeze
1710light breeze
1810light breeze
1910light breeze
2010light breeze
2110light breeze
2210light breeze
2310light breeze
2410light breeze
2510light breeze
2610light breeze
2710light breeze
2810light breeze
2910light breeze
3010light breeze

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 24 min at the start of September to 11 h 48 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 36 minutes over September. Sunrise moves from 6:19 AM to 6:27 AM, and sunset from 6:45 PM to 6:16 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.46:196:45
212.46:196:44
312.46:196:43
412.46:206:42
512.46:206:41
612.36:206:40
712.36:206:39
812.36:216:38
912.36:216:37
1012.26:216:36
1112.26:226:35
1212.26:226:34
1312.26:226:33
1412.26:226:32
1512.16:236:31
1612.16:236:30
1712.16:236:29
1812.16:236:28
1912.16:246:27
2012.06:246:26
2112.06:246:25
2212.06:246:24
2312.06:256:23
2412.06:256:22
2511.96:256:21
2611.96:266:20
2711.96:266:19
2811.96:266:18
2911.86:266:17
3011.86:276:16

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 6.44 kWh/m².

For context, solar energy here swings from a low near 4.24 kWh/m² to a high of 7.21 kWh/m² in June across the year — September's 6.44 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
16.7Intense
26.7Intense
36.7Intense
46.7Intense
56.7Intense
66.6Intense
76.6Intense
86.6Intense
96.6Intense
106.6Intense
116.5Intense
126.5Intense
136.5Intense
146.5Intense
156.5Intense
166.4Intense
176.4Intense
186.4Intense
196.4Intense
206.3Intense
216.3Intense
226.3Intense
236.3Intense
246.2Intense
256.2Intense
266.2Intense
276.1Intense
286.1Intense
296.1Intense
306.0Intense
Planning a trip in September

Hazard calendar for Wahiawā-Whitmore

In seasonPeak

In September, Wahiawā-Whitmore sits inside its pacific hurricane season. The full year is below, with each hazard's peak months called out.

Wahiawā-Whitmore sits in the eastern Pacific hurricane zone; the season peaks August–September.

Pacific hurricane
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is September a good time to visit Wahiawā-Whitmore?

Our two travel scores rate September for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

6.3
Sightseeing
11th-best month of the year
7.6
Beach & pool
2nd-best month of the year

September is a reasonable time to visit Wahiawā-Whitmore for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Wahiawā-Whitmore in September

From September's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In September, Wahiawā-Whitmore sees daytime highs around 83°F and nights near 74°F. Pack light clothes and sun protection. About 7 days see rain.

light clothessun protection

Sea temperature near Wahiawā-Whitmore in September

The nearest coast averages about 80°F in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 10 mi away) is warmest in September at about 80°F and coldest in February near 75°F.

The water stays above 68°F all year — warm enough for a swim any month.

74°76°78°80°82°JanFebMarAprMayJunJulAugSepOctNovDecrefreshingwarmcomfortable to swim
Sea temperature (°F)Comfort
Jan76Warm
Feb75Refreshing
Mar75Warm
Apr76Warm
May77Warm
Jun78Warm
Jul79Warm
Aug80Warm
Sep80Warm
Oct80Warm
Nov79Warm
Dec77Warm

UV index in Wahiawā-Whitmore in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 12 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Wahiawā-Whitmore peaks around July 23 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 19 at about 6 (high).

The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecVery highExtremeVery highHighJul 23UV 12Dec 19UV 6
UV index (midday)Level
Jan6High
Feb9Very high
Mar10Extreme
Apr11Extreme
May10Very high
Jun11Extreme
Jul12Extreme
Aug12Extreme
Sep12Extreme
Oct9Very high
Nov7High
Dec6High
Location & terrain

Where is Wahiawā-Whitmore?

Wahiawā-Whitmore sits at 21.5°N, 158.0°W, 919 ft above sea level, in United States. The nearest listed city is Wahiawā, 0.6 mi away.

Topography around Wahiawā-Whitmore

How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Wahiawā-Whitmore.

Within 2 miles, the terrain around Wahiawā-Whitmore has only modest variations in elevation — a maximum elevation change of 515 ft around an average of 928 ft above sea level; within 10 miles, very significant variations in elevation — a maximum elevation change of 3,999 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 3,983 ft.

The land around Wahiawā-Whitmore is covered by trees (39%), grassland (36%) and artificial surfaces (21%) within 2 miles, trees (63%) and grassland (24%) within 10 miles, and water (86%) within 50 miles.

2 miles
515 ft
10 miles
3,999 ft
50 miles
3,983 ft
treesshrubsgrasslandartificial surfacesbare terrainwater
September weather nearby: Wahiawā 0.6 mi · Schofield-Wheeler 1.9 mi · Schofield Barracks 1.9 mi · Mililani Mauka 3.1 mi · Mililani Mauka / Launani Valley 3.7 mi · Mililani Town 3.7 mi · Waipahu 8.1 mi · Pearl City 8.1 mi

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
Protestant 47%unaffiliated 23%Roman Catholic 21%Jewish 2%

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 Wahiawā-Whitmore (21.5056°, -158.0335°, elevation 919 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. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).