Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
September's arrival aligns with a minor decrease in average high-temperatures, from August's 85.6°F (29.8°C) to a still warm 80.1°F (26.7°C). In the month of September, the average temperature in Portland dips to a comfortable 61.5°F (16.4°C) during the night.Humidity
The average relative humidity in September is 76%.Rainfall
In September, the rain falls for 14.7 days. Throughout September, 2.8" (71mm) of precipitation is accumulated. In Portland, during the entire year, the rain falls for 177.4 days and collects up to 44.61" (1133mm) of precipitation.Snowfall
In Portland, Tennessee, snow does not fall in May through October.Daylight
In September, the average length of the day is 12h and 24min.On the first day of the month, sunrise is at 6:17 am and sunset at 7:13 pm. On the last day of September, sunrise is at 6:41 am and sunset at 6:30 pm CDT.
Sunshine
In Portland, the average sunshine in September is 8.3h.UV index
In Portland, Tennessee, the average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a medium vulnerability from unprotected exposure to Sun's UV rays for average individuals.Note: In September, the average maximum UV index of 5 translates into the following recommendations:
Preventative actions are necessary - The mandate to avoid skin and eye damage is in place. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Portland in September?
What is the average humidity in September in Portland?
How many days does it rain in September in Portland?
When it does not snow in Portland?
What is the average length of the day in September in Portland?
When are sunrise and sunset in September in Portland?
How long on average sun shines in September in Portland?
How high is the UV index in September in Portland?
Average temperature in September
Portland, TN
- Average high temperature in September: 80.1°F
The warmest month (with the highest average high temperature) is July (86.9°F).
The month with the lowest average high temperature is January (42.8°F).
- Average low temperature in September: 61.5°F
The month with the highest average low temperature is July (68.4°F).
The coldest month (with the lowest average low temperature) is January (28.8°F).
Average pressure in September
Portland, TN
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.96"Hg).
Average wind speed in September
Portland, TN
- Average wind speed in September: 5.3mph
The windiest month (with the highest average wind speed) is February (8.4mph).
The calmest months (with the lowest average wind speed) are July and August (4.8mph).
Average humidity in September
Portland, TN
- Average humidity in September: 76%
The months with the highest relative humidity are March, May and December (79%).
The months with the lowest relative humidity are October and November (75%).
Average rainfall in September
Portland, TN
- Average rainfall in September: 2.8"
The wettest month (with the highest rainfall) is July (5.39").
The driest month (with the least rainfall) is November (2.56").
Average rainfall days in September
Portland, TN
- Average rainfall days in September: 14.7 days
The month with the highest number of rainy days is July (19.7 days).
The month with the least rainy days is November (9.7 days).
Average snowfall in September
Portland, TN
- Average snowfall in September: 0"
The month with the highest snowfall is February (1.69").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Portland, TN
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (5.3 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Portland, TN
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 36min).
The month with the shortest days is December (Average daylight: 9h and 42min).
- Average sunshine in September: 8h and 2min
The month with the most sunshine is June (Average sunshine: 10h and 6min).
The month with the least sunshine is February (Average sunshine: 4h and 12min).
Average sunshine days in September
Portland, TN
- Average sunshine days in September: 14.1 days
The month with the most sunshine days is November (17.7 days).
The month with the least sunshine days is July (9.7 days).
Average UV index in September
Portland, TN
- Average UV index in September: 5
The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February and December (UV index 2).
Average cloud cover in September
Portland, TN
- Average cloud cover in September: 34
The month with the most cloud cover is February (Cloud cover 56).
The month with the least cloud cover is June (Cloud cover 32).
Average visibility in September
Portland, TN
- Average visibility in September: 6mi
The months with the highest visibility are February, March, April, June, August, September, October, November and December (6mi).
The months with the lowest visibility are January, May and July (5mi).
Portland, Tennessee, USA
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