Hilo (HI)
September
Weather in Hilo, Hawaii for September 2025
Your guide to Hilo weather in September - trends and predictions
In general, the average temperature in Hilo at the beginning of September is 24.7 °F. As the month progressed, temperatures tended to slightly decrease, reaching an average of 24.4 °F by the end of September.
Hilo experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 141.7 mm.
New! Chat with our AI weatherman - it’s amazing and free.
Temperatures
Rain 🌧️
More
0
Dry days
30
Rainy days
0
Snow days
25°/21°
Temperatures
15 km/h
Avg max wind
76 %
Avg humidity
Hilo Weather September
Move between months or click on a day
Temperatures trend during September in Hilo
See the weather trend as well as the moving average line
September weather in Hilo day by day
Click on a date for more information
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Heavy rain at times | 25° /22° | 3.7 mm | 6 | |
| Sept. 2 |  Moderate rain at times | 25° /22° | 3.3 mm | 5 | |
| Sept. 3 |  Patchy rain possible | 25° /21° | 2.6 mm | 6 | |
| Sept. 4 |  Overcast | 25° /21° | 0.6 mm | 6 | |
| Sept. 5 |  Cloudy | 25° /21° | 0.8 mm | 6 | |
| Sept. 6 | Moderate rain at times | 24° /21° | 2.6 mm | 5 | |
| Sept. 7 | Patchy rain possible | 24° /21° | 3.8 mm | 5 | |
| Sept. 8 | Patchy rain possible | 25° /21° | 0.6 mm | 6 | |
| Sept. 9 | Overcast | 24° /21° | 0.3 mm | 5 | |
| Sept. 10 | Moderate rain at times | 26° /22° | 3.8 mm | 6 | |
| Sept. 11 | Moderate rain at times | 25° /21° | 8.6 mm | 6 | |
| Sept. 12 | Patchy rain possible | 26° /22° | 4.9 mm | 6 | |
| Sept. 13 | Patchy rain possible | 25° /22° | 5.5 mm | 6 | |
| Sept. 14 | Moderate rain at times | 24° /20° | 6.9 mm | 5 | |
| Sept. 15 | Moderate or heavy rain shower | 25° /21° | 14.9 mm | 6 | |
| Sept. 16 | Patchy rain possible | 25° /23° | 6.2 mm | 6 | |
| Sept. 17 | Moderate rain at times | 25° /22° | 7.7 mm | 6 | |
| Sept. 18 | Patchy rain possible | 25° /22° | 2.8 mm | 6 | |
| Sept. 19 | Heavy rain at times | 25° /21° | 8.6 mm | 5 | |
| Sept. 20 | Moderate or heavy rain shower | 23° /21° | 14.6 mm | 5 | |
| Sept. 21 | Heavy rain at times | 23° /20° | 7.1 mm | 5 | |
| Sept. 22 | Patchy rain possible | 24° /20° | 5.4 mm | 5 | |
| Sept. 23 | Moderate rain at times | 26° /20° | 4.4 mm | 6 | |
| Sept. 24 | Patchy rain possible | 25° /22° | 1 mm | 6 | |
| Sept. 25 | Patchy rain possible | 25° /21° | 4.6 mm | 5 | |
| Sept. 26 | Heavy rain at times | 24° /22° | 6.2 mm | 5 | |
| Sept. 27 | Moderate rain at times | 24° /22° | 6 mm | 5 | |
| Sept. 28 | Patchy rain possible | 23° /19° | 1.2 mm | 5 | |
| Sept. 29 | Patchy rain possible | 25° /20° | 1.4 mm | 6 | |
| Sept. 30 |  Partly cloudy | 25° /21° | 1.5 mm | 7 | |
| Next | |||||
Important Notice
Our weather forecast for Hilo 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 Hilo forecast closer to your planned date for the most up-to-date weather information.
Change Month
Hilo in September - FAQ
What are the expected maximum and minimum temperatures in Hilo during September?
During September, expect a variety of temperatures with highs around 25° and lows near 21°, suitable for diverse activities and preferences.
How much rainfall should be expected in Hilo during September?
Significant rainfall exceeding 141.7 mm is expected in Hilo during September, occurring over more than 30 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Hilo during September?
The average wind speed in Hilo during September is 15 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Hilo
Explore the daily rainfall trends and prepare for Hilos September weather 💧
UV exposure in Hilo during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
Quick links
More Hilo weather pages
You are here
Where is Hilo?Get accurate weather forecasts for Hilo, located at latitude 19.73 and longitude -155.091. Stay updated with localized weather information tailored for Hilo.
Found a mistake?
We appreciate your attention to details. Tell us here.