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
The shift from August to September includes a small decrease in the average high-temperature, from a moderately hot 81.5°F (27.5°C) to a still warm 76.1°F (24.5°C). During the nights in September, Houston experiences a consistent average temperature of 64°F (17.8°C).Humidity
In Houston, the average relative humidity in September is 79%.Rainfall
In September, the rain falls for 13.5 days. Throughout September, 1.85" (47mm) of precipitation is accumulated. In Houston, during the entire year, the rain falls for 152.4 days and collects up to 25.94" (659mm) of precipitation.Snowfall
April, June through October are months without snowfall in Houston, Delaware.Daylight
The average length of the day in September in Houston is 12h and 26min.On the first day of September in Houston, sunrise is at 6:31 am and sunset at 7:32 pm. On the last day of the month, sunrise is at 6:57 am and sunset at 6:45 pm EDT.
Sunshine
In September, the average sunshine is 9.4h.UV index
In September, the average daily maximum UV index in Houston is 5. A UV Index of 3 to 5 symbolizes a medium health hazard from unprotected exposure to Sun's UV rays for the ordinary person.Note: A maximum UV index of 5 in September translates into the following recommendations:
Take heed. Individuals of lighter complexion can be burned in less than half an hour. The Sun's radiation is especially intense around midday; try to stay in shade during this period. 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.
Frequently asked questions
What is the average September temperature in Houston?
What is the average humidity in September in Houston?
How many days does it rain in September in Houston?
When it does not snow in Houston?
What is the average length of the day in September in Houston?
When is the sunrise / sunset in September in Houston?
How many hours of sunshine does Houston have in September?
What is the UV index reading in September in Houston?
Average temperature in September
Houston, DE
- Average high temperature in September: 76.1°F
The warmest month (with the highest average high temperature) is July (83.1°F).
The month with the lowest average high temperature is January (40.6°F).
- Average low temperature in September: 64°F
The month with the highest average low temperature is July (70.7°F).
The coldest month (with the lowest average low temperature) is January (29.7°F).
Average pressure in September
Houston, DE
- Average pressure in September: 30.04"Hg
The month with the highest atmospheric pressure is November (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in September
Houston, DE
- Average wind speed in September: 7.8mph
The windiest month (with the highest average wind speed) is February (10.4mph).
The calmest month (with the lowest average wind speed) is August (6.6mph).
Average humidity in September
Houston, DE
- Average humidity in September: 79%
The month with the highest relative humidity is May (80%).
The months with the lowest relative humidity are January and November (74%).
Average rainfall in September
Houston, DE
- Average rainfall in September: 1.85"
The wettest month (with the highest rainfall) is August (3.07").
The driest month (with the least rainfall) is January (1.5").
Average rainfall days in September
Houston, DE
- Average rainfall days in September: 13.5 days
The month with the highest number of rainy days is July (17.3 days).
The month with the least rainy days is January (8.4 days).
Average snowfall in September
Houston, DE
- Average snowfall in September: 0"
The month with the highest snowfall is January (1.22").
The months with the least snowfall are April, June, July, August, September and October (0").
Average snowfall days in September
Houston, DE
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (3.3 days).
The months with the least snowfall days are April, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Houston, DE
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in September: 9h and 2min
The month with the most sunshine is July (Average sunshine: 10h and 48min).
The month with the least sunshine is February (Average sunshine: 5h and 0min).
Average sunshine days in September
Houston, DE
- Average sunshine days in September: 14.7 days
The month with the most sunshine days is January (19.6 days).
The month with the least sunshine days is July (11.6 days).
Average UV index in September
Houston, DE
- 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 and December (UV index 2).
Average cloud cover in September
Houston, DE
- Average cloud cover in September: 32
The months with the most cloud cover are February and March (Cloud cover 45).
The month with the least cloud cover is July (Cloud cover 27).
Average visibility in September
Houston, DE
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Houston, Delaware, USA
Weather forecast for your location
2. Allow the app to use your location
