United StatesAverage weather for Hilo in September
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.
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. There are plenty of days with a good chance of precipitation.
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.
Water temperature
The water temperature at Hilo is 28°C this month. Nice and warm for a swim.
In September, there is an average of 447 mm of precipitation, spread over 20 days. The wind speed is around 4 Bft, mostly coming from the Southwest.
Hilo in September |
New York | ||
|---|---|---|---|
 Average temperature |
30°C | 27°C | |
 Max. temperature |
31°C | 31°C | |
| Min. temperature |
29°C | -5°C | |
 Total precipitation |
447 mm | 57 mm | |
| Rainy days |
20 days | 9 days | |
August
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.
Is September a good time to visit Hilo?
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.
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.
Check out the climate of Hilo for all months and discover the best travel time
Daily Temperature in September in Hilo
This chart shows the average daily high and low temperatures in September for Hilo, in degrees Celsius. The red line represents the highs, and the blue line shows the lows. The days of the month are displayed at the bottom of the chart. The data, based on historical observations, provide the average temperatures for this month.
Daily Precipitation in September in Hilo
The chart below shows the average daily precipitation in September for Hilo, measured in millimeters over the past few years. Precipitation is always measured as water, even if it’s snow or hail. The days of the month are listed at the bottom of the chart.
A low average precipitation means that the chance of rain on that day is usually small, while a higher average suggests that it rained more often. But remember, it’s just an average, and every day can be different. Based on historical weather data for September, you can expect about 20 days of precipitation in Hilo.
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.
Temperature in September in Hilo over the years
This chart shows the average temperature in September in Hilo, measured in degrees Celsius, over the past few years.
Total precipitation in September in Hilo over the years
This chart shows the average precipitation in September in Hilo, measured in millimeters over the past years. Precipitation is always measured as water, whether it’s snow or hail.
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.
Weather experiences in September in Hilo
Have you been to Hilo in September?
Share your weather experience in September in Hilo.
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.
