Kalihi Valley weather in September

In September, Kalihi Valley sees average daytime highs of 79°F and overnight lows near 77°F, with 0.4 in of rain across 2.2 wet days and about 12.1 hours of daylight. It is the 1st-warmest and 9th-wettest month of the year here.

Day-to-day highs hold fairly steady near 79°F through the month. The sky is clear or mostly clear about 74% of the time in September, and the air most often feels oppressive.

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 Kalihi Valley's 3rd-clearest and 6th-windiest month. For the whole year in context, see Kalihi Valley's year-round climate.

Daytime high
79°
1st warmest
Overnight low
77°
12th coldest
Rainfall
0.4 in
2.2 wet days
Daylight
12 h 06 min
6:22 AM – 6:29 PM
Cloud cover
29%
3rd clearest
Wind
16 mph
6th windiest
Solar energy
6.48 kWh/m²
Travel score
8.4
out of 10

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 79°F through the month.

A typical September day in Kalihi Valley reaches about 79°F in the afternoon and slips back to 77°F overnight — a 2°F spread between the day's warmth and the night's chill. On most days the high lands between 78°F and 81°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)
17977
27977
37977
47977
57977
67977
77977
87977
97977
107977
117977
127977
137977
147977
157977
167977
177977
187977
197977
207977
217977
227977
237977
247977
257977
267977
277977
287977
297977
307977

Kalihi Valley weather by month

How September compares with the rest of the year at a glance. September is the 1st-warmest and 9th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysDaylight (hours)Travel score
Jan74° / 72°1.44.910.88.2
Feb74° / 71°1.14.411.38.1
Mar74° / 71°1.54.411.88.2
Apr75° / 72°0.42.412.58.6
May76° / 74°0.52.2138.7
Jun77° / 75°0.31.113.38.8
Jul78° / 76°0.2113.28.7
Aug79° / 77°0.41.812.78.5
Sep79° / 77°0.42.212.18.4
Oct79° / 76°0.82.911.58.1
Nov77° / 75°1.64.9118.0
Dec75° / 73°1.95.210.78.2

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 74% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 11% of September, with mostly cloudy or overcast conditions the remaining 15%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
18614
28713
38713
48713
58713
68713
78713
88713
98713
108713
118713
128713
138713
148713
158713
168713
178614
188614
198614
208614
218515
228515
238416
248317
258317
268218
278218
288020
298020
307921

Chance of precipitation in September

Any precipitation

Kalihi Valley gets around 0.4 in of rain over 2.2 wet days in September. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 8% and peaks near 8% on the wettest days.

0%10%20%30%151015202530
Rain chance (%)
17
27
37
47
57
67
77
87
98
108
118
128
138
148
158
168
178
188
198
208
218
228
238
247
257
267
277
287
297
307

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the oppressive band about 53% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1047521
2047521
3047521
4046531
5046531
6046531
7045541
8045541
9045541
10044551
11044551
12044551
13044551
14044551
15044551
16045541
17045541
18045541
19145540
20146530
21146530
22146530
23147520
24147520
25147520
26148510
27148510
28148510
29148510
30148510

Wind in September

Winds average 16 mph in September.

Across September, daily wind ranges from about 15 mph on the calmest days to 17 mph at its breeziest. It stays fairly steady from day to day.

05101520151015202530
Wind speed (mph)Feels
117breezy
217breezy
316breezy
416breezy
516breezy
616breezy
716breezy
816breezy
916breezy
1016breezy
1116breezy
1216breezy
1316breezy
1416breezy
1516breezy
1616breezy
1716breezy
1816breezy
1915breezy
2015breezy
2115breezy
2215breezy
2315breezy
2415breezy
2515breezy
2615breezy
2715breezy
2815breezy
2915breezy
3015breezy

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 6:18 AM to 6:26 AM, and sunset from 6:44 PM to 6:15 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.46:186:44
212.46:186:43
312.46:196:42
412.46:196:41
512.36:196:40
612.36:196:39
712.36:206:38
812.36:206:37
912.36:206:36
1012.26:216:35
1112.26:216:34
1212.26:216:33
1312.26:216:32
1412.26:226:31
1512.16:226:30
1612.16:226:29
1712.16:226:28
1812.16:236:27
1912.16:236:26
2012.06:236:25
2112.06:236:24
2212.06:246:23
2312.06:246:22
2412.06:246:21
2511.96:246:20
2611.96:256:19
2711.96:256:18
2811.96:256:17
2911.86:266:16
3011.86:266:15

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 6.48 kWh/m².

For context, solar energy here swings from a low near 4.29 kWh/m² to a high of 7.28 kWh/m² in June across the year — September's 6.48 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
16.8Intense
26.8Intense
36.7Intense
46.7Intense
56.7Intense
66.7Intense
76.7Intense
86.7Intense
96.6Intense
106.6Intense
116.6Intense
126.6Intense
136.5Intense
146.5Intense
156.5Intense
166.5Intense
176.5Intense
186.4Intense
196.4Intense
206.4Intense
216.3Intense
226.3Intense
236.3Intense
246.3Intense
256.2Intense
266.2Intense
276.2Intense
286.1Intense
296.1Intense
306.1Intense
Planning a trip in September

Hazard calendar for Kalihi Valley

In seasonPeak

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

Kalihi Valley 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 Kalihi Valley?

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

8.4
Sightseeing
6th-best month of the year
8.1
Beach & pool
3rd-best month of the year

September is one of the better times to visit Kalihi Valley for general sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Kalihi Valley in September

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

In September, Kalihi Valley sees daytime highs around 79°F and nights near 77°F. Pack sun protection. Worth having: light clothes and a windbreaker.

sun protectionlight clothesa windbreaker

Sea temperature near Kalihi Valley 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 offshore 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
Feb75Warm
Mar75Warm
Apr76Warm
May77Warm
Jun78Warm
Jul79Warm
Aug80Warm
Sep80Warm
Oct80Warm
Nov79Warm
Dec77Warm

UV index in Kalihi Valley 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 Kalihi Valley 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.

025710JanFebMarAprMayJunJulAugSepOctNovDecVery highExtremeVery highHighJul 21UV 12Dec 18UV 6
UV index (midday)Level
Jan7High
Feb9Very high
Mar10Extreme
Apr11Extreme
May10Extreme
Jun11Extreme
Jul12Extreme
Aug12Extreme
Sep12Extreme
Oct9Very high
Nov7High
Dec6High
Location & terrain

Where is Kalihi Valley?

Kalihi Valley sits at 21.4°N, 157.8°W, 538 ft above sea level, in United States. The nearest listed city is Nuuanu - Punchbowl, 1.9 mi away.

Topography around Kalihi Valley

How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Kalihi Valley.

Within 2 miles, the terrain around Kalihi Valley has large variations in elevation — a maximum elevation change of 2,451 ft around an average of 1,010 ft above sea level; within 10 miles, large variations in elevation — a maximum elevation change of 3,117 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 3,983 ft.

The land around Kalihi Valley is covered by trees (89%) within 2 miles, trees (39%) and water (35%) within 10 miles, and water (87%) within 50 miles.

2 miles
2,451 ft
10 miles
3,117 ft
50 miles
3,983 ft
treesshrubsgrasslandartificial surfacesbare terrainwater
September weather nearby: Nuuanu - Punchbowl 1.9 mi · Liliha - Kapalama 1.9 mi · Makiki / Lower Punchbowl / Tantalus 3.1 mi · Kalihi-Palama 3.1 mi · Kaneohe 3.7 mi · Honolulu 4.3 mi · Manoa 4.3 mi · Ala Moana - Kakaʻako 5.0 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 Kalihi Valley (21.3637°, -157.8429°, elevation 538 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).