September weather forecastCarlisle, PA
September
Weather in September
Carlisle’s September weather, ranging from 55.8°F (13.2°C) to 74.3°F (23.5°C), signifies a brief, pleasant interlude between summer and the approaching season of fall in October. The break from the intense heat of summer is welcomed by many. The reduction in temperature is subtle but enough to change the atmosphere. Rainfall sees a decline, further enhancing the mild nature of the September weather.Temperature
Carlisle's September weather shows a modest shift in high-temperatures, falling from August's moderately hot 81.3°F (27.4°C) to a still warm 74.3°F (23.5°C). September witnesses an average nighttime temperature of 55.8°F (13.2°C).Humidity
In September, the average relative humidity is 78%.Rainfall
In September, the rain falls for 10.4 days. Throughout September, 0.79" (20mm) of precipitation is accumulated. In Carlisle, during the entire year, the rain falls for 123.7 days and collects up to 12.09" (307mm) of precipitation.Snowfall
In Carlisle, snow does not fall in May through September.Daylight
In September, the average length of the day is 12h and 27min.On the first day of September, sunrise is at 6:37 am and sunset at 7:40 pm. On the last day of the month, sunrise is at 7:04 am and sunset at 6:52 pm EDT.
Sunshine
In September, the average sunshine is 8.9h.UV index
In September, the average daily maximum UV index is 4. A UV Index reading of 3 to 5 represents a medium vulnerability from unprotected exposure to Sun's UV rays for average individuals.Note: The maximum daily UV index of 4 in September interprets into the following recommendations:
Heed the precautions - Protecting the skin and eyes from damage is compulsory. UV radiation from the Sun is most dangerous during midday; take precautions and seek shade. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Carlisle, PA
- Average high temperature in September: 74.3°F
The warmest month (with the highest average high temperature) is July (83.8°F).
The month with the lowest average high temperature is January (35.1°F).
- Average low temperature in September: 55.8°F
The month with the highest average low temperature is July (63.7°F).
The coldest month (with the lowest average low temperature) is January (22.3°F).
Average pressure in September
Carlisle, 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
Carlisle, PA
- Average wind speed in September: 5.3mph
The windiest month (with the highest average wind speed) is March (8.1mph).
The calmest months (with the lowest average wind speed) are July and August (4.8mph).
Average humidity in September
Carlisle, PA
- Average humidity in September: 78%
The month with the highest relative humidity is February (80%).
The months with the lowest relative humidity are April and July (75%).
Average rainfall in September
Carlisle, PA
- Average rainfall in September: 0.79"
The wettest month (with the highest rainfall) is May (1.34").
The driest months (with the least rainfall) are January and February (0.75").
Average rainfall days in September
Carlisle, PA
- Average rainfall days in September: 10.4 days
The month with the highest number of rainy days is May (14.7 days).
The month with the least rainy days is January (5.3 days).
Average snowfall in September
Carlisle, PA
- Average snowfall in September: 0"
The month with the highest snowfall is February (1.5").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Carlisle, PA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (7.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Carlisle, 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 54min
The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is February (Average sunshine: 4h and 30min).
Average sunshine days in September
Carlisle, PA
- Average sunshine days in September: 17.7 days
The month with the most sunshine days is November (21.5 days).
The month with the least sunshine days is May (13.8 days).
Average UV index in September
Carlisle, PA
- Average UV index in September: 4
The months with the highest UV index are May, 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
Carlisle, PA
- Average cloud cover in September: 37
The month with the most cloud cover is February (Cloud cover 50).
The month with the least cloud cover is July (Cloud cover 31).
Average visibility in September
Carlisle, 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).
