Kahului weather in September: Kahului, Hawaii: normal highs, lows, rain and records for September
Kahului in September has a normal high of 90°F and a normal low of 71°F, a daily mean of 81°F, holding near 90°F all month. Measurable precipitation falls on 5 days in a normal September, 0.45 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 32°C and low of 22°C, 11 mm of precipitation in September.
- NOAA stationKahului Airport
- Station IDUSW00022516
- Location20.90°N 156.43°W
- Elevation51 ft (16 m)
- From the center3 miles
- Population (census place)27,068
- Jan 82° 64°
- Feb 82° 64°
- Mar 83° 65°
- Apr 85° 67°
- May 87° 68°
- Jun 88° 70°
- Jul 89° 72°
- Aug 90° 72°
- Sep 90° 71°
- Oct 89° 70°
- Nov 86° 68°
- Dec 83° 66°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Kahului in September?
The normal high is 90°F and the normal low 71°F, for a daily mean of 80.6°F. September is 0.5°F cooler than August and 1.2°F warmer than October. September is the 2nd warmest month of the year in Kahului and the 11th wettest. From one year to the next September's mean temperature typically moves about 1.2°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 79°F and 82°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 21%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 90°F | 72°F | 21% | 4% |
| September 8 | 90°F | 71°F | 19% | 4% |
| September 15 | 90°F | 71°F | 18% | 4% |
| September 22 | 90°F | 71°F | 17% | 4% |
| September 30 | 90°F | 71°F | 18% | 4% |
Every day of September: normal high, low and chance of precipitation (warmest afternoon September 1, coldest night September 30)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| September 1 | 90°F | 72°F | 21% | 4% | 12 h 30 min |
| September 2 | 90°F | 72°F | 20% | 4% | 12 h 30 min |
| September 3 | 90°F | 72°F | 20% | 4% | 12 h 30 min |
| September 4 | 90°F | 72°F | 20% | 4% | 12 h 30 min |
| September 5 | 90°F | 72°F | 20% | 4% | 12 h 30 min |
| September 6 | 90°F | 72°F | 20% | 4% | 12 h 30 min |
| September 7 | 90°F | 72°F | 19% | 4% | 12 h 30 min |
| September 8 | 90°F | 71°F | 19% | 4% | 12 h 30 min |
| September 9 | 90°F | 71°F | 19% | 4% | 12 h 20 min |
| September 10 | 90°F | 71°F | 19% | 4% | 12 h 20 min |
| September 11 | 90°F | 71°F | 19% | 4% | 12 h 20 min |
| September 12 | 90°F | 71°F | 18% | 4% | 12 h 20 min |
| September 13 | 90°F | 71°F | 18% | 4% | 12 h 20 min |
| September 14 | 90°F | 71°F | 18% | 4% | 12 h 20 min |
| September 15 | 90°F | 71°F | 18% | 4% | 12 h 20 min |
| September 16 | 90°F | 71°F | 18% | 4% | 12 h 20 min |
| September 17 | 90°F | 71°F | 18% | 4% | 12 h 20 min |
| September 18 | 90°F | 71°F | 18% | 4% | 12 h 10 min |
| September 19 | 90°F | 71°F | 18% | 4% | 12 h 10 min |
| September 20 | 90°F | 71°F | 18% | 4% | 12 h 10 min |
| September 21 | 90°F | 71°F | 17% | 4% | 12 h 10 min |
| September 22 | 90°F | 71°F | 17% | 4% | 12 h 10 min |
| September 23 | 90°F | 71°F | 17% | 4% | 12 h 10 min |
| September 24 | 90°F | 71°F | 17% | 4% | 12 h 10 min |
| September 25 | 90°F | 71°F | 17% | 4% | 12 h 10 min |
| September 26 | 90°F | 71°F | 17% | 4% | 12 h |
| September 27 | 90°F | 71°F | 17% | 4% | 12 h |
| September 28 | 90°F | 71°F | 18% | 4% | 12 h |
| September 29 | 90°F | 71°F | 18% | 4% | 12 h |
| September 30 | 90°F | 71°F | 18% | 4% | 12 h |
- Normal high
- 90°FSeptember average
- Normal low
- 71°FSeptember average
- Precipitation
- 0.45 inmonth total
- Days with precipitation
- 50.01 inch or more
- Days at 90°F or more
- 10
- Daylight
- 12 h 30 min to 12 hSeptember 1 to September 30
- Days at 70°F or more
- 30
- Days at 80°F or more
- 30
- Sunshine
- 88%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00022516; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Kahului in September?
On a given September day the chance of 0.01 inch or more is 18% on average, highest around September 1 (21%). In all, 0.45 in falls on 5 days of a normal September.
In a normal September in Kahului, 10 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00022516.
How humid and windy is Kahului in September?
At 3 p.m. the normal temperature is 85°F with 56% relative humidity and a dew point of 68°F; at 6 a.m. it is 72°F with 81% humidity. The wind averages 11.8 mph, most often from the northeast in the afternoon. A dew point of 65°F or more feels muggy to most people.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 72°F | 66°F | 81% | 7.5 mph | 63% |
| 9 a.m. | 82°F | 68°F | 64% | 11.7 mph | 58% |
| noon | 86°F | 68°F | 55% | 18.0 mph | 39% |
| 3 p.m. | 85°F | 68°F | 56% | 18.5 mph | 33% |
| 6 p.m. | 80°F | 68°F | 68% | 13.8 mph | 33% |
| 9 p.m. | 77°F | 68°F | 75% | 9.8 mph | 64% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00022516. Hourly normals exist only for NOAA's first-order stations; a dash where NOAA publishes no value for that hour (the sky at some hours).
What are the records for September in Kahului?
The warmest September temperature on Kahului's official record (since 1954) is 97°F, on September 16, 2019; the coldest is 59°F, on September 15, 2009. The wettest September brought 1.97 in (2018).
The September mean against the 1991-2020 normal of 80.6°F: 2021 79.8°F (−0.8), 2022 82.3°F (+1.7), 2023 79.9°F (−0.7), 2024 79.8°F (−0.8), 2025 80.6°F (at normal), 2026 80.9°F (+0.3). 2 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 79.8°F | −0.8°F | 0.13 in |
| 2022 | 82.3°F | +1.7°F | 0.53 in |
| 2023 | 79.9°F | −0.7°F | 0.08 in |
| 2024 | 79.8°F | −0.8°F | 0.00 in |
| 2025 | 80.6°F | at normal | 0.04 in |
| 2026 | 80.9°F | +0.3°F | 0.60 in |
Source: records: ACIS, NWS threaded record OGGthr; recent months: ACIS, station USW00022516. Records and recent months use complete months only.
How does September in Kahului compare across Hawaii?
Across the 18 places PlainClimate covers in Hawaii, September normal highs run from 75°F in Kula to 90°F in Kahului; Kahului's is 90°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.