September weather forecastRehoboth Beach, DE
September
Weather in September
September marks the transition from summer to autumn in Rehoboth Beach, Delaware. The temperatures start to decline, and rainfall is reduced compared to August. Sunshine hours decrease as the daylight shortens, marking a change in the seasonal cycle. While the weather remains warm enough for beach activities, the atmosphere gently moves towards autumn. September in Rehoboth Beach exudes a serene ambience as the city readies itself for fall.Temperature
Rehoboth Beach observes a minor difference in average high-temperatures between August's 79.2°F (26.2°C) and September's 74.1°F (23.4°C). In Rehoboth Beach, the average low-temperature during September nights tends to settle at an enjoyable 67.8°F (19.9°C), indicating a slight drop from the daytime peak.Humidity
In Rehoboth Beach, the average relative humidity in September is 78%.Rainfall
September is the month with the least rainfall. Rain falls for 7.5 days and accumulates 0.28" (7mm) of precipitation.Snowfall
April through October are months without snowfall.Daylight
In September, the average length of the day is 12h and 26min.On the first day of the month, sunrise is at 6:30 am and sunset at 7:30 pm. On the last day of September, sunrise is at 6:55 am and sunset at 6:44 pm EDT.
Sunshine
In September, the average sunshine in Rehoboth Beach, Delaware, is 9.6h.UV index
In Rehoboth Beach, the average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a moderate health risk from unsafe exposure to UV radiation for the ordinary person.Note: The maximum daily UV index of 5 during September translates into the following directions:
Undertake protective steps - Recommendations to avoid sunburn are issued. UV radiation from the Sun is most dangerous during midday; take precautions and seek shade. 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
Rehoboth Beach, DE
- Average high temperature in September: 74.1°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 (41.4°F).
- Average low temperature in September: 67.8°F
The month with the highest average low temperature is July (73.6°F).
The coldest month (with the lowest average low temperature) is January (33.1°F).
Average pressure in September
Rehoboth Beach, DE
- Average pressure in September: 30.04"Hg
The month with the highest atmospheric pressure is November (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in September
Rehoboth Beach, DE
- Average wind speed in September: 10.6mph
The windiest month (with the highest average wind speed) is January (13mph).
The calmest month (with the lowest average wind speed) is August (8.8mph).
Average humidity in September
Rehoboth Beach, DE
- Average humidity in September: 78%
The month with the highest relative humidity is May (82%).
The month with the lowest relative humidity is November (73%).
Average rainfall in September
Rehoboth Beach, DE
- Average rainfall in September: 0.28"
The wettest month (with the highest rainfall) is October (0.71").
The driest month (with the least rainfall) is September (0.28").
Average rainfall days in September
Rehoboth Beach, DE
- Average rainfall days in September: 7.5 days
The month with the highest number of rainy days is July (10.2 days).
The month with the least rainy days is November (4.9 days).
Average snowfall in September
Rehoboth Beach, DE
- Average snowfall in September: 0"
The months with the highest snowfall are January and December (0.12").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Rehoboth Beach, DE
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (2.4 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Rehoboth Beach, DE
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in September: 9h and 36min
The month with the most sunshine is July (Average sunshine: 11h and 6min).
The month with the least sunshine is February (Average sunshine: 5h and 0min).
Average sunshine days in September
Rehoboth Beach, DE
- Average sunshine days in September: 20 days
The month with the most sunshine days is January (23.5 days).
The months with the least sunshine days are June and July (18.2 days).
Average UV index in September
Rehoboth Beach, DE
- Average UV index in September: 5
The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February and December (UV index 2).
Average cloud cover in September
Rehoboth Beach, DE
- Average cloud cover in September: 30
The month with the most cloud cover is February (Cloud cover 45).
The month with the least cloud cover is July (Cloud cover 24).
Average visibility in September
Rehoboth Beach, DE
- 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).
