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 coincides with a soft drop in the average high-temperature, subtly decreasing from August's warm 82.8°F (28.2°C) to a still moderately hot 76.1°F (24.5°C). The low-temperature averages to a moderate 57.9°F (14.4°C) during the nights of September.Humidity
In Mechanics Valley, the average relative humidity in September is 77%.Rainfall
The month with the least rainfall is September, when the rain falls for 12 days and typically collects 1.65" (42mm) of precipitation.Snowfall
June through September are months without snowfall.Daylight
In September, the average length of the day is 12h and 27min.On the first day of September, sunrise is at 6:28 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
In Mechanics Valley, the average sunshine in September is 8.8h.UV index
In Mechanics Valley, Pennsylvania, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV radiation for the average person.Note: A maximum high UV index of 4 in September translates into the following recommendations:
Put precautions into practice - Protective measures against sun-induced damage are advised. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Mechanics Valley in September?
What is the average humidity in September?
What is the driest month?
How much does it rain in September?
When it does not snow?
Does it snow in September?
What is the average length of the day in September?
When are sunrise and sunset in September?
How long on average sun shines in September?
What is the UV index reading in September in Mechanics Valley?
Average temperature in September
Mechanics Valley, PA
- Average high temperature in September: 76.1°F
The warmest month (with the highest average high temperature) is July (84.9°F).
The month with the lowest average high temperature is January (35.6°F).
- Average low temperature in September: 57.9°F
The month with the highest average low temperature is July (66.7°F).
The coldest month (with the lowest average low temperature) is January (23.4°F).
Average pressure in September
Mechanics Valley, PA
- Average pressure in September: 30.06"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
Mechanics Valley, PA
- Average wind speed in September: 5.7mph
The windiest month (with the highest average wind speed) is March (8.3mph).
The calmest month (with the lowest average wind speed) is August (5.2mph).
Average humidity in September
Mechanics Valley, PA
- Average humidity in September: 77%
The months with the highest relative humidity are February and October (79%).
The month with the lowest relative humidity is April (73%).
Average rainfall in September
Mechanics Valley, PA
- Average rainfall in September: 1.65"
The wettest month (with the highest rainfall) is July (2.87").
The driest month (with the least rainfall) is September (1.65").
Average rainfall days in September
Mechanics Valley, PA
- Average rainfall days in September: 12 days
The month with the highest number of rainy days is July (17.3 days).
The month with the least rainy days is January (8.7 days).
Average snowfall in September
Mechanics Valley, PA
- Average snowfall in September: 0"
The month with the highest snowfall is March (2.76").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Mechanics Valley, PA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (7.9 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Mechanics Valley, PA
- Average daylight in September: 12h and 2min
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 24min).
- Average sunshine in September: 8h and 5min
The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is February (Average sunshine: 4h and 42min).
Average sunshine days in September
Mechanics Valley, PA
- Average sunshine days in September: 15.6 days
The month with the most sunshine days is November (18.5 days).
The month with the least sunshine days is June (11 days).
Average UV index in September
Mechanics Valley, PA
- Average UV index in September: 4
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, March, November and December (UV index 2).
Average cloud cover in September
Mechanics Valley, PA
- Average cloud cover in September: 38
The months with the most cloud cover are February and December (Cloud cover 48).
The month with the least cloud cover is July (Cloud cover 32).
Average visibility in September
Mechanics Valley, PA
- Average visibility in September: 5mi
The months with the highest visibility are January, February, March, April, June, July, August, October, November and December (6mi).
The months with the lowest visibility are May and September (5mi).
Mechanics Valley, Pennsylvania, USA
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