East Honolulu, HI weather in September
East Honolulu is warm and oppressively humid in September, with frequent rain: highs average 85°F and nights drop to about 74°F. There are about 12 days with rain.
- Normal high
- 85°F
- Normal low
- 74°F
- Wet days
- 12
- 1.7 in total
- Muggy days
- 30
- dew point 65°F+
How September changes from start to finish
| September 1 | September 30 | |
|---|---|---|
| Normal high | 85°F | 85°F |
| Normal low | 74°F | 73°F |
| Chance of a wet day | 39% | 39% |
| Sunrise / sunset | 6:14 am / 6:47 pm | 6:21 am / 6:19 pm |
| Daylight | 12.6 h | 12.0 h |
Chance of a wet day: average for the first and last 7 days of the month. Times are local clock time (Hawaii time (no daylight saving)).
A typical September day
- 6 am77°Fdew point 70°F
- 9 am81°Fdew point 70°F
- Noon83°Fdew point 70°F
- 3 pm83°Fdew point 70°F
- 6 pm80°Fdew point 70°F
- 9 pm79°Fdew point 70°F
NOAA hourly normals (local standard time) from Kaneohe Bay MCAS (12 mi away); average wind 8 mph; clear or few clouds in 37% of daytime hours, mostly cloudy or overcast in 23%.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F0 of 30
- Beach dayshigh 80-95°F, under 0.05 in of rain, afternoon wind under 15 mph24 of 30
- Hot dayshigh 90°F or more0 of 30
- Muggy daysdaily mean dew point 65°F or more30 of 30
- Wet daysat least 0.01 in of rain or melted snow12 of 30
- Notable rainat least 0.10 in4 of 30
- Freezing nightslow 32°F or below0 of 30
Average days per September, counted from daily records for each year 1991-2020.
Rain in September
Normal precipitation is 1.7 in; a dry September brings about 0.6 in and a wet one about 1.9 in (25th and 75th percentiles). About 1 day brings half an inch or more.
How September varies from year to year
- Warmest September, 1991-20202019: average high 89°F
- Coolest September1991: average high 83°F
- Wettest September2015: 7.5 in
- Driest September2017: 0.09 in
- Highest reading90°F (September 18, 2019)
- Lowest reading59°F (September 30, 1992)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
September compared with August and October
| August | September | October | |
|---|---|---|---|
| Normal high | 85°F | 85°F | 84°F |
| Normal low | 74°F | 74°F | 73°F |
| Wet days | 12 | 12 | 12 |
| Comfortable days | 0 | 0 | 0 |
| Daylight | 12.8 h | 12.3 h | 11.7 h |
Highs change by 0°F from August and -1°F into October.
Nearby alternatives in September
- Drier: Honolulu, HI9 mi · high 88°F · 7 wet days
How East Honolulu ranks in September
- Normal high133rd warmest of 378 cities; 5th of 7 in Hawaii
- Wet days344th driest of 378
- Comfortable days337th most of 342
What to pack for East Honolulu in September
- Light, breathable clothing – highs near 85°F and about 30 muggy days
- A rain jacket or umbrella – rain on about 12 days
- A swimsuit – about 24 beach days
Heating and cooling
September has 0 heating degree days and 435 cooling degree days (base 65°F), 11% of the year's total heating and cooling demand.
Questions
How hot is East Honolulu in September?
The normal high is 85°F and the normal low is 74°F. From 1991 to 2020 the hottest September reading was 90°F (most recently on September 18, 2019).
Does it rain a lot in East Honolulu in September?
About 12 days in September have at least 0.01 in of precipitation, and the normal total is 1.7 in. The wettest September in 1991-2020 was in 2015 (7.5 in); the driest was in 2017 (0.09 in).
Is September a good time to visit East Honolulu?
September ranks 9th of 12 months on our comfort score for East Honolulu (50 out of 100). It has almost no comfortable days. The best months are February, May and June.
Where the numbers come from
- Temperature and frost dates: Waimanalo Exp F 795.1 (USC00519523), 3.3 mi N of the city center, 64 ft (55 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Rain, snowfall and snow depth: Paiko Drive 723.4 (USC00517540), 1.2 mi WSW of the city center, 5 ft . NOAA normals and daily records, 1991-2020.
- Humidity and wind by hour: Kaneohe Bay MCAS (USW00022519), 12 mi NNW of the city center, 10 ft . NOAA normals and daily records, 1991-2020.
- Cloud cover: Honolulu Intl Airport (USW00022521), 14 mi W of the city center, 7 ft . NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Kaneohe MCAS (911760-22519), 12 mi NNW of the city center, 24 ft . Hourly observations, 1991-2020.