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 marks a gentle change in average high-temperature, declining from August's 81.1°F (27.3°C) to a still warm 74.3°F (23.5°C). In September, Washington reports a consistent average low-temperature of 55°F (12.8°C) during the nights.Humidity
The average relative humidity in September in Washington is 79%.Rainfall
The month with the least rainfall in Washington is September, when the rain falls for 11.5 days and typically collects 1.54" (39mm) of precipitation.Snowfall
In Washington, snow does not fall in June through September.Daylight
In Washington, the average length of the day in September is 12h and 27min.On the first day of September, sunrise is at 6:27 am and sunset at 7:31 pm. On the last day of the month, sunrise is at 6:56 am and sunset at 6:43 pm EDT.
Sunshine
The average sunshine in September in Washington is 8.6h.UV index
The average daily maximum UV index in September in Washington, New Jersey, is 4. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for the ordinary person.Note: The average daily UV index of 4 in September transforms into the following instructions:
Undertake precautions - Obligation exists to protect against skin and eye damage. Exposing oneself to the midday Sun can be harmful due to the strong UV radiation; limit your time outside. Boost your sun resistance with garments that are densely woven yet spacious.
Frequently asked questions
What is the temperature in September in Washington?
What is the average humidity in September in Washington?
What is the driest month in Washington?
How much does it rain in Washington in September?
When it does not snow in Washington?
Does it snow in Washington in September?
How many hours of daylight does Washington have in September?
When are sunrise and sunset in September in Washington?
How long on average sun shines in September in Washington?
What is the UV index intensity in September in Washington?
Average temperature in September
Washington, NJ
- Average high temperature in September: 74.3°F
The warmest month (with the highest average high temperature) is July (83.7°F).
The month with the lowest average high temperature is January (34°F).
- Average low temperature in September: 55°F
The month with the highest average low temperature is July (63°F).
The coldest month (with the lowest average low temperature) is January (21.6°F).
Average pressure in September
Washington, NJ
- Average pressure in September: 30.06"Hg
The month with the highest atmospheric pressure is November (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in September
Washington, NJ
- Average wind speed in September: 5.5mph
The windiest month (with the highest average wind speed) is March (8.1mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).
Average humidity in September
Washington, NJ
- Average humidity in September: 79%
The month with the highest relative humidity is February (81%).
The month with the lowest relative humidity is April (76%).
Average rainfall in September
Washington, NJ
- Average rainfall in September: 1.54"
The wettest month (with the highest rainfall) is July (2.87").
The driest month (with the least rainfall) is September (1.54").
Average rainfall days in September
Washington, NJ
- Average rainfall days in September: 11.5 days
The month with the highest number of rainy days is May (16.5 days).
The month with the least rainy days is January (8.1 days).
Average snowfall in September
Washington, NJ
- Average snowfall in September: 0"
The month with the highest snowfall is February (3.82").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Washington, NJ
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (8.4 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Washington, NJ
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in September: 8h and 4min
The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is February (Average sunshine: 4h and 36min).
Average sunshine days in September
Washington, NJ
- Average sunshine days in September: 15.8 days
The month with the most sunshine days is November (17.5 days).
The month with the least sunshine days is April (11.8 days).
Average UV index in September
Washington, NJ
- Average UV index in September: 4
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in September
Washington, NJ
- Average cloud cover in September: 40
The month with the most cloud cover is February (Cloud cover 50).
The month with the least cloud cover is July (Cloud cover 34).
Average visibility in September
Washington, NJ
- Average visibility in September: 5mi
The months with the highest visibility are April and November (6mi).
The months with the lowest visibility are January, February, March, May, June, July, August, September, October and December (5mi).
Washington, New Jersey, USA
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