Temperatures in September
It's hot in September in Umatilla with an average temperature of 32°C. Temperatures this month range from a low of 31°C to a high of 33°C. At night, you can expect temperatures between 23°C and 25°C.
Max and Min Temperatures per Day
This chart shows the daily maximum and minimum temperatures in degrees Celsius for Umatilla in September. The red line indicates the max temperatures, and the blue line shows the minimums.
Start of September
The month of September starts in Umatilla with hot temperatures, averaging around 33°C during the day and nights close to 25°C. Plenty of days with a chance of precipitation. Breezy clothes like shorts or a dress, plus a hat and sunglasses, are ideal.
Mid-September
By mid-September, the average daytime temperature drops to around 32°C, with nights close to 25°C. During this part of the month, you can expect regular precipitation, but there’ll also be some sunny days. Breezy clothes like shorts or a dress, plus a hat and sunglasses, are ideal.
End of September
By the end of September, the average daytime temperature in Umatilla will be around 32°C, with nights close to 24°C. There’s regular precipitation, but with a bit of luck, you’ll also get some dry and sunny days. Breezy clothes like shorts or a dress, plus a hat and sunglasses, are ideal.
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Precipitation in September
In September, there is an average of 162 mm of precipitation, spread over 15 days. The wind speed is around 4 Bft, mostly coming from the Southeast.
Across the whole month, the average precipitation chance is 50% per day. Though it seems average, the weather’s variable. Some days have higher, others lower precipitation chances.
Precipitation Chance
This chart shows the daily precipitation chance (in percentages) in September for Umatilla. 0% means it never rained on that day in the past 10 years, and 100% means it rained every day. All values in between represent the average chance of precipitation on that day.
Umatilla in September |
London | ||
|---|---|---|---|
 Average Temperature |
32°C | 20°C | |
 High Temp |
33°C | 22°C | |
| Low Temp |
31°C | 17°C | |
 Total Precipitation |
162 mm | 44 mm | |
| Rainy Days |
15 days | 8 days | |
August
UV index
The UV index is a maximum of 5 this month. That's a moderate value on the intensity scale of 1 to 11. Unprotected skin can burn in about 30 minutes.
Is September a good time to visit Umatilla?
After some sun? Then September isn’t the best time to be in Umatilla. The temperature is pleasant, but there’s too much chance of rain this month.
The hurricane season in Umatilla runs from June to November.
Temperature records for Umatilla in September
With 36°C, Umatilla hit the highest temperature in the last 10 years in September 2019. The lowest daytime temperature in this month was 23°C in 2022. The extreme night temperatures ranged from a low of 17°C to a high of 28°C.
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Daily Temperature in September in Umatilla
This chart shows the average daily temperatures, both day and night, for each day in September in Umatilla, measured in degrees Celsius. The red line represents the maximum temperatures, while the blue line shows the minimums. The days of the month are displayed at the bottom of the chart. The data, based on historical observations, gives an overview of the average daily temperatures during this month.
Daily Precipitation in September in Umatilla
The chart below shows the average daily precipitation in September for Umatilla, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail. The days of the month are shown 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 rain is more likely. But it’s still an average, so each day can be different. Based on historical weather data for September, you can expect around 15 days of rain in Umatilla.
Daily UV Index in September in Umatilla
This chart shows the average daily UV index in September in Umatilla, 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 Umatilla Over the Years
This chart shows the average temperature in September in Umatilla, measured in degrees Celsius, over the past years.
Total Precipitation in September in Umatilla Over the Years
This chart shows the average precipitation in September in Umatilla, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail.
Daily climate in September for Umatilla
Click on a specific day in September for detailed info on the typical weather on that day in Umatilla. Check out the historical temperatures and precipitation over the past 10 years on this day.
Weather experiences in September in Umatilla
Have you been to Umatilla in September?
Share your weather experience in September in Umatilla.
Average Weather in Umatilla by Month
Click on a month below to see detailed weather info for Umatilla. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.
