Honolulu County (Honolulu)
September
Weather in Honolulu County, Hawaii for September 2025
Your guide to Honolulu County weather in September - trends and predictions
Until now, September 2025 in Honolulu County has been nearly identical to the historical average, with a temperature of 27.2 °F (showing only a slight deviation of 0 °F).
The forecast for the next days in Honolulu County predicts temperatures to be around 27 °F, close to the historical average.
In general, the average temperature in Honolulu County at the beginning of September is 27 °F. As the month progressed, temperatures tended to remain steady, reaching an average of 27 °F by the end of September.
Honolulu County experiences moderate rainfall in September, with an average of 8 rainy days and a total precipitation of 20.9 mm.
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Temperatures
Rain 🌧️
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22
Dry days
8
Rainy days
0
Snow days
27°/23°
Temperatures
24 km/h
Avg max wind
71 %
Avg humidity
Honolulu County Weather September
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Temperatures trend during September in Honolulu County
See the weather trend as well as the moving average line
September weather in Honolulu County day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Patchy rain possible | 27° /23° | 2 mm | 6 | |
| Sept. 2 | Patchy rain possible | 27° /23° | 0.2 mm | 6 | |
| Sept. 3 | Patchy rain possible | 27° /23° | 0.3 mm | 6 | |
| Sept. 4 | Patchy rain possible | 27° /23° | 0.5 mm | 6 | |
| Sept. 5 | Patchy rain possible | 27° /23° | 0.4 mm | 6 | |
| Sept. 6 | Patchy rain possible | 27° /23° | 0.3 mm | 6 | |
| Sept. 7 | Patchy rain possible | 27° /23° | 0.2 mm | 6 | |
| Sept. 8 | Patchy rain possible | 27° /23° | 1 mm | 6 | |
| Sept. 9 | Patchy rain possible | 28° /23° | 0.8 mm | 6 | |
| Sept. 10 |  Partly cloudy | 28° /23° | 1.7 mm | 6 | |
| Sept. 11 | Patchy rain possible | 27° /23° | 0.7 mm | 6 | |
| Sept. 12 | Patchy rain possible | 27° /23° | 0 mm | 6 | |
| Sept. 13 | Patchy rain possible | 27° /24° | 0.3 mm | 6 | |
| Sept. 14 | Patchy rain possible | 27° /23° | 0.4 mm | 6 | |
| Sept. 15 | Patchy rain possible | 27° /25° | 0.2 mm | 2.5 | |
| Sept. 16 | Patchy rain possible | 27° /24° | 0.4 mm | 2.3 | |
| Sept. 17 | Patchy rain possible | 27° /25° | 0.3 mm | 2.6 | |
| Sept. 18 | Patchy rain possible | 27° /25° | 0.9 mm | 2.6 | |
| Sept. 19 | Patchy rain possible | 27° /25° | 2.3 mm | 0 | |
| Sept. 20 | Patchy rain possible | 27° /25° | 0.3 mm | 6 | |
| Sept. 21 | Patchy rain possible | 27° /25° | 0.2 mm | 6 | |
| Sept. 22 | Patchy rain possible | 27° /25° | 0.2 mm | 6 | |
| Sept. 23 | Patchy rain possible | 27° /25° | 0.4 mm | 6 | |
| Sept. 24 | Patchy rain possible | 27° /25° | 0.2 mm | 6 | |
| Sept. 25 | Patchy rain possible | 27° /25° | 0.1 mm | 6 | |
| Sept. 26 | Patchy rain possible | 27° /25° | 0.2 mm | 6 | |
| Sept. 27 | Patchy rain possible | 27° /25° | 0.1 mm | 6 | |
| Sept. 28 |  Sunny | 27° /24° | 0 mm | 7 | |
| Sept. 29 | Patchy rain possible | 27° /23° | 0.5 mm | 6 | |
| Sept. 30 | Patchy rain possible | 27° /23° | 1.4 mm | 6 | |
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Important Notice
Our weather forecast for Honolulu County in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Honolulu County forecast closer to your planned date for the most up-to-date weather information.
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Honolulu County in September - FAQ
What are the expected maximum and minimum temperatures in Honolulu County during September?
During September, expect a variety of temperatures with highs around 27° and lows near 23°, suitable for diverse activities and preferences.
How much rainfall should be expected in Honolulu County during September?
In September, Honolulu County can expect light to moderate rainfall, totaling 20.9 mm across approximately 8 days. Occasional showers are possible, and planning ahead for them could be helpful.
What are the typical wind conditions in Honolulu County during September?
The average wind speed in Honolulu County during September is 24 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Honolulu County
Explore the daily rainfall trends and prepare for Honolulu Countys September weather 💧
UV exposure in Honolulu County during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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Where is Honolulu County?Get accurate weather forecasts for Honolulu County, located at latitude 21.307 and longitude -157.858. Stay updated with localized weather information tailored for Honolulu County.
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