Weathermondo.com
United StatesThe weather in September in Hilo
It's hot in September in Hilo with an average temperature of 30°C. Temperatures this month range from a low of 29°C to a high of 31°C. At night, you can expect temperatures between 20°C and 23°C.
Looking for sun? September isn’t a good month to be in Hilo. The temperature is nice, but there’s too much chance of rain.
Average temperatures and precipitation
This chart shows the average daily maximum and minimum temperatures (in degrees Celsius) and precipitation (in millimeters) in September for Hilo, Hawaii. A low precipitation value usually indicates little to no rainfall on that day in recent years, while a higher value suggests more frequent rainfall.
Temperature records
With 34°C in 2019, Hilo reached the highest temperature in September over the past 10 years. The lowest daytime temperature in this month was 23°C in 2021. The extreme nighttime temperatures ranged from a lowest recorded value of 5°C to a highest value of 25°C.
Water temperature
The water temperature at Hilo is 28°C this month. Nice and warm for a swim.
Rainfall amount
In September, there is an average of 447 mm of precipitation, spread over 27 days. The wind speed is around 4 Bft, mostly coming from the Southwest.
Daily weather in September for Hilo
Click on any day in September to get detailed info about the usual weather on that day in Hilo. Check out the historical temperatures and precipitation over the past 10 years on this day.
September weather comparison
| Hilo | New York | |
|---|---|---|
| Average temperature | 30°C | 27°C |
| Max. temperature | 31°C | 31°C |
| Min. temperature | 20°C | -5°C |
| Total precipitation | 447 mm | 57 mm |
| Rainy days | 27 days | 9 days |
Start of September
The month of September starts in Hilo with hot temps, averaging around 31°C during the day and nights around 23°C.
Mid September
By mid-September, daytime temps drop to around 30°C, with nights around 22°C. There’s a high chance of precipitation during this time.
End of September
By the end of September, the average daytime temperature in Hilo is around 30°C, while nighttime temps are about 23°C. There’s a significant chance of many days with precipitation.
UV index
The UV index is a maximum of 9 this month. That's a very high value on the intensity scale of 1 to 11. Unprotected skin can burn within 10-15 minutes.
Check out the climate of Hilo for all months and discover the best travel time
Temperature charts
These charts show the average temperatures in September in Hilo, Hawaii. The temperatures are shown in degrees Celsius and are calculated based on data from the past 10 years.
Daily Temperature in September in Hilo
Temperature in September in Hilo over the years
Precipitation charts
These charts show the average amount of precipitation in September in Hilo, Hawaii. Precipitation is always measured as water, even when it falls as snow or hail The amount of precipitation is displayed in millimeters, while snowfall is shown in centimeters.
Daily Precipitation in September in Hilo
Total precipitation in September in Hilo over the years
Daily UV index in September in Hilo
This chart shows the average daily UV index in September in Hilo, with the UV index ranging from 0 to a maximum of 11. The bottom of the chart shows the days of the month. Based on historical data, this chart provides an idea of the daily UV radiation levels you can expect.
Weather experiences in September in Hilo
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Average weather in Hilo by month
Click on a month below to see detailed weather info for Hilo. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.