September weather forecastMerrian, PA
September
Weather in September
September, the first month of the autumn in Merrian, is also an agreeable month, with an average temperature varying between 53.6°F (12°C) and 72.9°F (22.7°C).Temperature
A mild drop in Merrian's average high-temperature is observed in September, transitioning from a moderately hot 79.3°F (26.3°C) in August to an agreeable 72.9°F (22.7°C). In September, Merrian's temperature tends to fall to an average low of 53.6°F (12°C) during the night.Humidity
In Merrian, Pennsylvania, the average relative humidity in September is 80%.Rainfall
In Merrian, in September, it is raining for 9.8 days, with typically 1.02" (26mm) of accumulated precipitation. In Merrian, during the entire year, the rain falls for 129.2 days and collects up to 16.42" (417mm) of precipitation.Snowfall
June through September are months without snowfall in Merrian, Pennsylvania.Daylight
The average length of the day in September is 12h and 27min.On the first day of September in Merrian, sunrise is at 6:33 am and sunset at 7:37 pm. On the last day of the month, sunrise is at 7:01 am and sunset at 6:48 pm EDT.
Sunshine
The average sunshine in September in Merrian is 8.7h.UV index
In Merrian, Pennsylvania, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for ordinary individuals.Note: An average UV index of 4 in September transforms into this advice:
Proceed with care. Light skin individuals may be exposed to burns in fewer than 30 minutes. To avoid the Sun's strongest rays, limit exposure around the mid-day period. Tightly woven clothing, when worn loosely, shields effectively against the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Merrian, PA
- Average high temperature in September: 72.9°F
The warmest month (with the highest average high temperature) is July (81.5°F).
The month with the lowest average high temperature is January (32°F).
- Average low temperature in September: 53.6°F
The month with the highest average low temperature is July (61.2°F).
The coldest month (with the lowest average low temperature) is January (20.1°F).
Average pressure in September
Merrian, PA
- Average pressure in September: 30.07"Hg
The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in September
Merrian, PA
- Average wind speed in September: 5.5mph
The windiest months (with the highest average wind speed) are March and April (8.3mph).
The calmest month (with the lowest average wind speed) is August (4.7mph).
Average humidity in September
Merrian, PA
- Average humidity in September: 80%
The month with the highest relative humidity is February (82%).
The months with the lowest relative humidity are March and April (77%).
Average rainfall in September
Merrian, PA
- Average rainfall in September: 1.02"
The wettest months (with the highest rainfall) are May and July (1.97").
The driest month (with the least rainfall) is February (0.98").
Average rainfall days in September
Merrian, PA
- Average rainfall days in September: 9.8 days
The month with the highest number of rainy days is May (15.4 days).
The month with the least rainy days is January (5.8 days).
Average snowfall in September
Merrian, PA
- Average snowfall in September: 0"
The month with the highest snowfall is February (2.2").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Merrian, PA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Merrian, PA
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in September: 8h and 42min
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 6min).
Average sunshine days in September
Merrian, PA
- Average sunshine days in September: 17.5 days
The month with the most sunshine days is November (20.4 days).
The month with the least sunshine days is May (12.5 days).
Average UV index in September
Merrian, PA
- Average UV index in September: 4
The month with the highest UV index is June (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
Merrian, PA
- Average cloud cover in September: 38
The month with the most cloud cover is February (Cloud cover 56).
The month with the least cloud cover is July (Cloud cover 33).
Average visibility in September
Merrian, PA
- Average visibility in September: 5mi
The months with the highest visibility are March, April, November and December (6mi).
The months with the lowest visibility are January, February, May, June, July, August, September and October (5mi).
