September weather forecastTopsham, ME
September
Weather in September
The first month of the autumn, September, is still a comfortable month in Topsham, Maine, with an average temperature varying between 67.1°F (19.5°C) and 54.3°F (12.4°C).Temperature
The advent of September brings a slight shift in average high-temperature, moving from a warm 73.4°F (23°C) in August to a refreshing 67.1°F (19.5°C). September nights in Topsham cool down to an average low-temperature of 54.3°F (12.4°C).Humidity
In Topsham, the average relative humidity in September is 79%.Rainfall
The month with the least rainfall in Topsham is September, when the rain falls for 8.9 days and typically collects 0.75" (19mm) of precipitation.Snowfall
May through September are months without snowfall in Topsham, Maine.Daylight
In September, the average length of the day in Topsham is 12h and 30min.On the first day of September, sunrise is at 6:04 am and sunset at 7:15 pm. On the last day of the month, sunrise is at 6:37 am and sunset at 6:22 pm EDT.
Sunshine
In Topsham, the average sunshine in September is 8.6h.UV index
The average daily maximum UV index in September in Topsham is 4. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV radiation for ordinary individuals.Note: The daily high UV index of 4 in September translates into this advice:
Adopt protective measures - Requirement to safeguard skin and eyes from harm exists. Avoiding the Sun's peak radiation during midday hours is essential for health and safety. During bright days, sunglasses that offer UVA and UVB defense are recommended.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Topsham, ME
- Average high temperature in September: 67.1°F
The warmest months (with the highest average high temperature) are July and August (73.4°F).
The month with the lowest average high temperature is January (29.7°F).
- Average low temperature in September: 54.3°F
The month with the highest average low temperature is July (60.4°F).
The coldest month (with the lowest average low temperature) is January (18.9°F).
Average pressure in September
Topsham, ME
- Average pressure in September: 30.05"Hg
The month with the highest atmospheric pressure is September (30.05"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in September
Topsham, ME
- Average wind speed in September: 7.8mph
The windiest month (with the highest average wind speed) is January (10.9mph).
The calmest month (with the lowest average wind speed) is August (6.9mph).
Average humidity in September
Topsham, ME
- Average humidity in September: 79%
The months with the highest relative humidity are June and July (82%).
The month with the lowest relative humidity is November (75%).
Average rainfall in September
Topsham, ME
- Average rainfall in September: 0.75"
The wettest month (with the highest rainfall) is October (1.85").
The driest month (with the least rainfall) is September (0.75").
Average rainfall days in September
Topsham, ME
- Average rainfall days in September: 8.9 days
The month with the highest number of rainy days is July (13.3 days).
The month with the least rainy days is February (4.8 days).
Average snowfall in September
Topsham, ME
- Average snowfall in September: 0"
The month with the highest snowfall is February (2.95").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Topsham, ME
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (8.5 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Topsham, ME
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).
- Average sunshine in September: 8h and 36min
The month with the most sunshine is August (Average sunshine: 10h and 24min).
The month with the least sunshine is December (Average sunshine: 4h and 36min).
Average sunshine days in September
Topsham, ME
- Average sunshine days in September: 18.7 days
The month with the most sunshine days is January (19.6 days).
The month with the least sunshine days is April (15 days).
Average UV index in September
Topsham, ME
- Average UV index in September: 4
The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in September
Topsham, ME
- Average cloud cover in September: 33
The month with the most cloud cover is March (Cloud cover 51).
The month with the least cloud cover is August (Cloud cover 32).
Average visibility in September
Topsham, ME
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
