Haleiwa, HI weather in September
In September, Haleiwa sees highs around 86°F and lows around 70°F: warm and humid, with rain on most days. Expect about 21 wet days. Pack rain gear.
- Normal high
- 86°F
- Normal low
- 70°F
- Wet days
- 21
- 3.3 in total
- Muggy days
- 27
- dew point 65°F+
How September changes from start to finish
| September 1 | September 30 | |
|---|---|---|
| Normal high | 87°F | 86°F |
| Normal low | 70°F | 69°F |
| Chance of a wet day | 71% | 70% |
| Sunrise / sunset | 6:15 am / 6:49 pm | 6:23 am / 6:21 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 am76°Fdew point 68°F
- 9 am82°Fdew point 68°F
- Noon86°Fdew point 68°F
- 3 pm86°Fdew point 67°F
- 6 pm82°Fdew point 68°F
- 9 pm79°Fdew point 68°F
NOAA hourly normals (local standard time) from Honolulu Intl Airport (22 mi away); average wind 10 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 mph11 of 30
- Hot dayshigh 90°F or more4 of 30
- Muggy daysdaily mean dew point 65°F or more27 of 30
- Wet daysat least 0.01 in of rain or melted snow21 of 30
- Notable rainat least 0.10 in9 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 3.3 in; a dry September brings about 1.8 in and a wet one about 4.5 in (25th and 75th percentiles). About 1 day brings half an inch or more, and about 1 an inch or more.
How September varies from year to year
- Warmest September, 1991-20202003: average high 90°F
- Coolest September2012: average high 82°F
- Wettest September1996: 7.9 in
- Driest September1993: 1.2 in
- Highest reading94°F (September 21, 1995)
- 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 | 86°F | 86°F | 84°F |
| Normal low | 70°F | 70°F | 69°F |
| Wet days | 22 | 21 | 23 |
| Comfortable days | 0 | 0 | 0 |
| Daylight | 12.8 h | 12.3 h | 11.7 h |
Highs change by 0°F from August and -2°F into October.
Nearby alternatives in September
- Drier: Honolulu, HI25 mi · high 88°F · 7 wet days
How Haleiwa ranks in September
- Normal high127th warmest of 378 cities; 4th of 7 in Hawaii
- Wet days375th driest of 378
- Comfortable days338th most of 342
What to pack for Haleiwa in September
- Light, breathable clothing – highs near 86°F and about 27 muggy days
- A rain jacket or umbrella – rain on about 21 days
- A swimsuit – about 11 beach days
Heating and cooling
September has 0 heating degree days and 389 cooling degree days (base 65°F), 11% of the year's total heating and cooling demand.
Questions
How hot is Haleiwa in September?
The normal high is 86°F and the normal low is 70°F. From 1991 to 2020 the hottest September reading was 94°F (most recently on September 21, 1995).
Does it rain a lot in Haleiwa in September?
About 21 days in September have at least 0.01 in of precipitation, and the normal total is 3.3 in. The wettest September in 1991-2020 was in 1996 (7.9 in); the driest was in 1993 (1.2 in).
Is September a good time to visit Haleiwa?
September ranks 10th of 12 months on our comfort score for Haleiwa (43 out of 100). It has almost no comfortable days and about 4 days at 90°F or hotter. The best months are January, February and March.
Where the numbers come from
- Temperature, rain, snowfall, snow depth and frost dates: Waimea Valley 892.2 (USC00519603), 5.0 mi NE of the city center, 41 ft . NOAA normals and daily records, 1991-2020.
- Humidity and wind by hour and cloud cover: Honolulu Intl Airport (USW00022521), 22 mi SSE of the city center, 7 ft . NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Honolulu International Airport (911820-22521), 21 mi SSE of the city center, 6 ft . Hourly observations, 1991-2020.