September weather forecastRichmond, ME
September
Weather in September
With temperatures dropping to 68.9°F (20.5°C), September marks the onset of fall in Richmond. An interesting characteristic is the drastic reduction in rainfall to 1.38" (35mm) from the 2.28" (58mm) recorded in August. The foliage begins to change color, transforming the city into an explosion of oranges and yellows. Pumpkin patches and hayrides commence, symbolizing the arrival of the harvest season. Hence, September in Richmond, with declining temperatures, less rainfall, and fall foliage, ushers in the autumn season.Temperature
During the shift to September, Richmond records a mild decrease in average high-temperature, moving from a moderately hot 75.4°F (24.1°C) in August to an agreeable 68.9°F (20.5°C). The average temperature during September nights dips to a fresh 52.2°F (11.2°C).Humidity
In September, the average relative humidity is 80%.Rainfall
September is the month with the least rainfall. Rain falls for 9.5 days and accumulates 1.38" (35mm) of precipitation.Snowfall
June through September are months without snowfall.Ocean temperature
In September, the average ocean temperature is 59.2°F (15.1°C).Note: For the majority of people, swimming in water at 59.2°F (15.1°C) is not enjoyable. The challenge of controlling breathing escalates as the temperature decreases from 69.8°F (21°C) to 59°F (15°C).
Daylight
In Richmond, the average length of the day in September is 12h and 30min.On the first day of the month, sunrise is at 6:03 am and sunset at 7:14 pm. On the last day of September, in Richmond, sunrise is at 6:36 am and sunset at 6:21 pm EDT.
Sunshine
In September, the average sunshine is 8.4h.UV index
The average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a moderate health risk from unsafe exposure to UV radiation for the ordinary person.Note: An average maximum UV index of 4 in September leads to these recommendations:
Take precautions - Protection against skin and eye damage is obliged. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. 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
Richmond, ME
- Average high temperature in September: 68.9°F
The warmest month (with the highest average high temperature) is July (75.7°F).
The month with the lowest average high temperature is January (28.2°F).
- Average low temperature in September: 52.2°F
The month with the highest average low temperature is July (59.2°F).
The coldest month (with the lowest average low temperature) is January (16.2°F).
Average pressure in September
Richmond, ME
- Average pressure in September: 30.04"Hg
The months with the highest atmospheric pressure are September and November (30.04"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in September
Richmond, ME
- Average wind speed in September: 6.6mph
The windiest month (with the highest average wind speed) is March (9.4mph).
The calmest month (with the lowest average wind speed) is August (5.8mph).
Average humidity in September
Richmond, ME
- Average humidity in September: 80%
The months with the highest relative humidity are June and July (82%).
The month with the lowest relative humidity is November (76%).
Average rainfall in September
Richmond, ME
- Average rainfall in September: 1.38"
The wettest month (with the highest rainfall) is October (2.95").
The driest month (with the least rainfall) is September (1.38").
Average rainfall days in September
Richmond, ME
- Average rainfall days in September: 9.5 days
The month with the highest number of rainy days is April (15.1 days).
The month with the least rainy days is January (6.4 days).
Average snowfall in September
Richmond, ME
- Average snowfall in September: 0"
The month with the highest snowfall is January (5.28").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Richmond, ME
- Average snowfall days in September: 0 days
The months with the highest number of snowfall days are January and February (9.4 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average sea temperature in September
Richmond, ME
- Average sea temperature in September: 59.1°F
The best month for swimming (with the highest average sea temperature) is August (61.5°F).
The coldest month (with the lowest average sea temperature) is March (37.7°F).
Average daylight in September /
Average sunshine in September
Richmond, 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: 8h and 54min).
- Average sunshine in September: 8h and 24min
The month with the most sunshine is August (Average sunshine: 10h and 12min).
The month with the least sunshine is February (Average sunshine: 4h and 36min).
Average sunshine days in September
Richmond, ME
- Average sunshine days in September: 18.1 days
The month with the most sunshine days is September (18.1 days).
The month with the least sunshine days is April (11.7 days).
Average UV index in September
Richmond, ME
- Average UV index in September: 4
The month with the highest UV index is 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
Richmond, ME
- Average cloud cover in September: 35
The months with the most cloud cover are February, March and April (Cloud cover 51).
The month with the least cloud cover is August (Cloud cover 34).
Average visibility in September
Richmond, ME
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, September, October, November and December (6mi).
The months with the lowest visibility are May, June, July and August (5mi).
