Kihei, HI weather in September
Kihei is hot, humid and mostly dry in September: highs average 90°F and nights drop to about 71°F. Rain falls on about 5 days.
- Normal high
- 90°F
- Normal low
- 71°F
- Wet days
- 5
- 0.5 in total
- Muggy days
- 25
- dew point 65°F+
How September changes from start to finish
| September 1 | September 30 | |
|---|---|---|
| Normal high | 90°F | 90°F |
| Normal low | 72°F | 71°F |
| Chance of a wet day | 20% | 18% |
| Sunrise / sunset | 6:09 am / 6:41 pm | 6:16 am / 6:14 pm |
| Daylight | 12.5 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 am73°Fdew point 66°F
- 9 am82°Fdew point 68°F
- Noon86°Fdew point 68°F
- 3 pm86°Fdew point 68°F
- 6 pm80°Fdew point 68°F
- 9 pm77°Fdew point 68°F
NOAA hourly normals (local standard time) from Kahului Airport (10 mi away); average wind 13 mph; clear or few clouds in 40% of daytime hours, mostly cloudy or overcast in 17%.
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 mph4 of 30
- Hot dayshigh 90°F or more10 of 30
- Muggy daysdaily mean dew point 65°F or more25 of 30
- Wet daysat least 0.01 in of rain or melted snow5 of 30
- Notable rainat least 0.10 in1 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 0.5 in; a dry September brings about 0.1 in and a wet one about 0.7 in (25th and 75th percentiles). Days with half an inch or more are rare.
How September varies from year to year
- Warmest September, 1991-20202019: average high 92°F
- Coolest September1998: average high 86°F
- Wettest September2018: 2.0 in
- Driest September2002: no measurable precipitation
- Highest reading97°F (September 16, 2019)
- Lowest reading59°F (September 15, 2009)
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 | 90°F | 90°F | 89°F |
| Normal low | 72°F | 71°F | 70°F |
| Wet days | 7 | 5 | 7 |
| 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
- Cooler: Hilo, HI114 mi · high 83°F · 23 wet days
How Kihei ranks in September
- Normal high51st warmest of 378 cities; 1st of 7 in Hawaii
- Wet days83rd driest of 378
- Comfortable days341st most of 342
What to pack for Kihei in September
- Light, breathable clothing – highs near 90°F and about 25 muggy days
Heating and cooling
September has 0 heating degree days and 468 cooling degree days (base 65°F), 11% of the year's total heating and cooling demand.
Questions
How hot is Kihei in September?
The normal high is 90°F and the normal low is 71°F. From 1991 to 2020 the hottest September reading was 97°F (September 16, 2019).
Does it rain a lot in Kihei in September?
About 5 days in September have at least 0.01 in of precipitation, and the normal total is 0.5 in. The wettest September in 1991-2020 was in 2018 (2.0 in); the driest was in 2002, with no measurable precipitation.
Is September a good time to visit Kihei?
September ranks 11th of 12 months on our comfort score for Kihei (46 out of 100). It has almost no comfortable days and about 10 days at 90°F or hotter. The best months are February, May and June.
Where the numbers come from
- Temperature, rain, frost dates, humidity and wind by hour and cloud cover: Kahului Airport (USW00022516), 10 mi N of the city center, 51 ft . NOAA normals and daily records, 1991-2020.
- Snowfall and snow depth: Kihei 311 (USC00514489), 2.6 mi NNE of the city center, 158 ft (147 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Kahului Airport (911900-22516), 9.3 mi N of the city center, 46 ft . Hourly observations, 1991-2020.