Honolulu County (Honolulu)
September
Weather in Honolulu County for September 2025
Your guide to Honolulu County weather in September - trends and predictions
In general, the average temperature in Honolulu County at the beginning of September is 27 °F. As the month progressed, temperatures tended to slightly decrease, reaching an average of 26.9 °F by the end of September.
Expect significant rainfall in Honolulu County during September, with an average of 20 rainy days.
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10
Dry days
20
Rainy days
0
Snow days
27°/23°
Temperatures
25 km/h
Avg max wind
72 %
Avg humidity
Honolulu County in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  27° | 2 27° | 3 27° | 4 27° | 5  27° | 6  27° | 7  27° |
| 8 27° | 9 27° | 10 27° | 11 27° | 12 27° | 13 27° | 14 27° |
| 15 27° | 16 28° | 17 27° | 18 27° | 19 27° | 20 27° | 21 26° |
| 22 26° | 23 26° | 24 26° | 25 27° | 26 27° | 27 27° | 28 27° |
| 29 27° | 30 27° |
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Temperatures trend during September in Honolulu County
See the weather trend as well as the moving average line
September weather day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 | Light rain shower | 27° /23° | 2.9 mm | 6 | |
| Sept. 2 | Patchy rain possible | 27° /23° | 0.3 mm | 6 | |
| Sept. 3 | Patchy rain possible | 27° /23° | 0.4 mm | 6 | |
| Sept. 4 | Patchy rain possible | 27° /23° | 0.4 mm | 6 | |
| Sept. 5 | Partly cloudy | 27° /23° | 0.3 mm | 7 | |
| Sept. 6 | Cloudy | 27° /23° | 0.2 mm | 6 | |
| Sept. 7 | Overcast | 27° /23° | 0.2 mm | 6 | |
| Sept. 8 | Patchy rain possible | 27° /23° | 0.6 mm | 7 | |
| Sept. 9 | Cloudy | 27° /23° | 0.3 mm | 6 | |
| Sept. 10 | Partly cloudy | 27° /23° | 0.2 mm | 7 | |
| Sept. 11 | Patchy rain possible | 27° /23° | 1 mm | 7 | |
| Sept. 12 | Cloudy | 27° /23° | 0.1 mm | 6 | |
| Sept. 13 | Partly cloudy | 27° /24° | 0.3 mm | 7 | |
| Sept. 14 | Partly cloudy | 27° /24° | 0.5 mm | 7 | |
| Sept. 15 | Partly cloudy | 27° /24° | 1 mm | 7 | |
| Sept. 16 | Light rain shower | 28° /24° | 1.3 mm | 6 | |
| Sept. 17 | Cloudy | 27° /23° | 0.6 mm | 6 | |
| Sept. 18 | Patchy rain possible | 27° /24° | 0.9 mm | 6 | |
| Sept. 19 | Patchy rain possible | 27° /23° | 0.5 mm | 6 | |
| Sept. 20 | Patchy rain possible | 27° /23° | 0.5 mm | 6 | |
| Sept. 21 | Patchy rain possible | 26° /23° | 0.9 mm | 6 | |
| Sept. 22 | Patchy rain possible | 26° /23° | 0.5 mm | 6 | |
| Sept. 23 | Light rain shower | 26° /23° | 1.4 mm | 6 | |
| Sept. 24 | Patchy rain possible | 26° /23° | 1 mm | 6 | |
| Sept. 25 | Patchy rain possible | 27° /23° | 0.3 mm | 6 | |
| Sept. 26 | Patchy rain possible | 27° /23° | 0.6 mm | 6 | |
| Sept. 27 | Light rain shower | 27° /23° | 1.3 mm | 6 | |
| Sept. 28 | Patchy rain possible | 27° /23° | 0.5 mm | 6 | |
| 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.
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 22.5 mm across approximately 20 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 25 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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