September weather forecastJohnstown, PA
September
Weather in September
As Johnstown, Pennsylvania slips into autumn in September, the hours of daylight and temperatures see a gradual reduction. The arrival of autumn is marked with foliage beginning to turn different hues. Rainfall pairs up with these conditions, creating a picturesque landscape. As the environment cools down, temperatures descend to a low of 52.7°F (11.5°C). Despite this drop, the weather remains sufficiently warm to enjoy outdoor activities.Temperature
In September, the average high-temperature marginally drops from a warm 77.9°F (25.5°C) in August to an agreeable 72.1°F (22.3°C). In the month of September, Johnstown records a consistent average low-temperature of 52.7°F (11.5°C).Humidity
The average relative humidity in September is 80%.Rainfall
In Johnstown, in September, it is raining for 13.5 days, with typically 1.46" (37mm) of accumulated precipitation. In Johnstown, Pennsylvania, during the entire year, the rain falls for 152.7 days and collects up to 21.1" (536mm) of precipitation.Snowfall
In Johnstown, snow does not fall in June through September.Daylight
The average length of the day in September is 12h and 27min.On the first day of the month, sunrise is at 6:43 am and sunset at 7:47 pm. On the last day of September, sunrise is at 7:11 am and sunset at 6:59 pm EDT.
Sunshine
In Johnstown, the average sunshine in September is 8.2h.UV index
The average daily maximum UV index in September in Johnstown, Pennsylvania, is 3. A UV Index estimate of 3 to 5 represents a medium vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.Note: The maximum daily UV index, 3 in September, converts into the following recommendations:
Heed the precautions - Suggestions to avoid sunburn are made. To avoid the Sun's strongest rays, limit exposure around the mid-day period. Employ a hat with a wide brim for robust protection, cutting UV exposure by half.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Johnstown, PA
- Average high temperature in September: 72.1°F
The warmest month (with the highest average high temperature) is July (80.2°F).
The month with the lowest average high temperature is January (30.7°F).
- Average low temperature in September: 52.7°F
The month with the highest average low temperature is July (58.8°F).
The coldest month (with the lowest average low temperature) is January (18.9°F).
Average pressure in September
Johnstown, PA
- Average pressure in September: 30.06"Hg
The month with the highest atmospheric pressure is November (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).
Average wind speed in September
Johnstown, PA
- Average wind speed in September: 5.9mph
The windiest month (with the highest average wind speed) is January (10.1mph).
The calmest month (with the lowest average wind speed) is August (5.2mph).
Average humidity in September
Johnstown, PA
- Average humidity in September: 80%
The month with the highest relative humidity is February (87%).
The month with the lowest relative humidity is July (78%).
Average rainfall in September
Johnstown, PA
- Average rainfall in September: 1.46"
The wettest month (with the highest rainfall) is May (2.56").
The driest month (with the least rainfall) is November (1.1").
Average rainfall days in September
Johnstown, PA
- Average rainfall days in September: 13.5 days
The month with the highest number of rainy days is May (19.8 days).
The month with the least rainy days is January (6.8 days).
Average snowfall in September
Johnstown, PA
- Average snowfall in September: 0"
The month with the highest snowfall is March (4.21").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Johnstown, PA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (12 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Johnstown, PA
- Average daylight in September: 12h and 24min
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 12min
The month with the most sunshine is July (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 0min).
Average sunshine days in September
Johnstown, PA
- Average sunshine days in September: 13.9 days
The month with the most sunshine days is November (18.8 days).
The month with the least sunshine days is May (9 days).
Average UV index in September
Johnstown, PA
- Average UV index in September: 3
The months with the highest UV index are May, June, July and August (UV index 5).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in September
Johnstown, PA
- Average cloud cover in September: 44
The month with the most cloud cover is January (Cloud cover 72).
The month with the least cloud cover is August (Cloud cover 39).
Average visibility in September
Johnstown, PA
- Average visibility in September: 5mi
The month with the highest visibility is April (6mi).
The months with the lowest visibility are January, February, March, May, June, July, August, September, October, November and December (5mi).
