September weather forecastAnnapolis, CA
September
Weather in September
September, the first month of the autumn in Annapolis, is also a moderately hot month, with temperature in the range of an average low of 53.2°F (11.8°C) and an average high of 80.1°F (26.7°C).Temperature
Annapolis experiences an average high-temperature of a still moderately hot 80.1°F (26.7°C) with the onset of September, subtly varied from August's 83.5°F (28.6°C). Annapolis in September observes a substantial swing from the daily highs, with average nighttime temperatures of 53.2°F (11.8°C).Humidity
The months with the lowest humidity are July and September, with an average relative humidity of 60%.Rainfall
In Annapolis, during September, the rain falls for 2.1 days and regularly aggregates up to 0.16" (4mm) of precipitation. Throughout the year, there are 83.1 rainfall days, and 21.38" (543mm) of precipitation is accumulated.Snowfall
January, March through December are months without snowfall.Daylight
The average length of the day in September is 12h and 25min.On the first day of the month, sunrise is at 6:43 am and sunset at 7:43 pm. On the last day of September, sunrise is at 7:09 am and sunset at 6:57 pm PDT.
Sunshine
In September, the average sunshine is 10.9h.UV index
In Annapolis, the average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a moderate health risk from unsafe exposure to UV radiation for the average person.Note: In September, the average maximum UV index of 5 translates into the following recommendations:
Exercise prevention - Precautions against solar damage are endorsed. UV radiation from the Sun is most dangerous during midday; take precautions and seek shade. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Annapolis, CA
- Average high temperature in September: 80.1°F
The warmest month (with the highest average high temperature) is August (83.5°F).
The month with the lowest average high temperature is December (54.7°F).
- Average low temperature in September: 53.2°F
The month with the highest average low temperature is August (54.1°F).
The coldest month (with the lowest average low temperature) is December (39.9°F).
Average pressure in September
Annapolis, CA
- Average pressure in September: 29.92"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The months with the lowest atmospheric pressure are June, August and September (29.92"Hg).
Average wind speed in September
Annapolis, CA
- Average wind speed in September: 5.2mph
The windiest month (with the highest average wind speed) is May (6.8mph).
The calmest month (with the lowest average wind speed) is November (4.9mph).
Average humidity in September
Annapolis, CA
- Average humidity in September: 60%
The month with the highest relative humidity is March (78%).
The months with the lowest relative humidity are July and September (60%).
Average rainfall in September
Annapolis, CA
- Average rainfall in September: 0.16"
The wettest month (with the highest rainfall) is February (4.49").
The driest months (with the least rainfall) are July and August (0.04").
Average rainfall days in September
Annapolis, CA
- Average rainfall days in September: 2.1 days
The month with the highest number of rainy days is March (15 days).
The month with the least rainy days is August (0.9 days).
Average snowfall in September
Annapolis, CA
- Average snowfall in September: 0"
The month with the highest snowfall is February (0.2").
The months with the least snowfall are January, March, April, May, June, July, August, September, October, November and December (0").
Average snowfall days in September
Annapolis, CA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (0.3 days).
The months with the least snowfall days are January, March, April, May, June, July, August, September, October, November and December (0 days).
Average daylight in September /
Average sunshine in September
Annapolis, CA
- 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: 10h and 54min
The months with the most sunshine are July and August (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 5h and 24min).
Average sunshine days in September
Annapolis, CA
- Average sunshine days in September: 27.1 days
The months with the most sunshine days are July and August (29.6 days).
The month with the least sunshine days is March (14.6 days).
Average UV index in September
Annapolis, CA
- Average UV index in September: 5
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are February, November and December (UV index 3).
Average cloud cover in September
Annapolis, CA
- Average cloud cover in September: 10
The month with the most cloud cover is March (Cloud cover 42).
The months with the least cloud cover are July and August (Cloud cover 6).
Average visibility in September
Annapolis, CA
- 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).
