September weather forecastOceanside, CA
September
Weather in September
September, the first month of the autumn in Oceanside, is still a warm month, with temperature in the range of an average high of 77.9°F (25.5°C) and an average low of 63.5°F (17.5°C).Temperature
The onset of September notes an average high-temperature of a still warm 77.9°F (25.5°C), subtly shifted from August's 78.6°F (25.9°C). In September, the nighttime temperature in Oceanside lowers to an average of 63.5°F (17.5°C).Humidity
The average relative humidity in September is 67%.Rainfall
In September, in Oceanside, California, the rain falls for 4.9 days. Throughout September, 0.31" (8mm) of precipitation is accumulated. Throughout the year, there are 68.2 rainfall days, and 9.49" (241mm) of precipitation is accumulated.Ocean temperature
In Oceanside, the average seawater temperature in September is 66.9°F (19.4°C).Note: A majority do not enjoy swimming in water at 66.9°F (19.4°C). The difficulty in controlling breathing increases progressively as the temperature dips below 69.8°F (21°C).
Daylight
The average length of the day in September in Oceanside is 12h and 22min.On the first day of September in Oceanside, sunrise is at 6:24 am and sunset at 7:14 pm. On the last day of the month, sunrise is at 6:43 am and sunset at 6:34 pm PDT.
Sunshine
In Oceanside, the average sunshine in September is 10.5h.UV index
July through September, with an average maximum UV index of 6, are months with the highest UV index. A UV Index reading of 6 to 7 represents a high health risk from unsafe exposure to UV radiation for the average person.Note: A daily high UV index of 6 in September leads to these guidelines:
Escape overexposure. People with light skin may incur burns in fewer than 20 minutes. Try to minimize direct Sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation. Also note that objects like parasols or canopies might not provide complete sun protection. For minimizing sun-related eye damage, always choose sunglasses with UVA and UVB coverage.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Oceanside, CA
- Average high temperature in September: 77.9°F
The warmest month (with the highest average high temperature) is August (78.6°F).
The month with the lowest average high temperature is December (62.4°F).
- Average low temperature in September: 63.5°F
The month with the highest average low temperature is August (64.2°F).
The coldest month (with the lowest average low temperature) is February (49.6°F).
Average pressure in September
Oceanside, CA
- Average pressure in September: 29.88"Hg
The month with the highest atmospheric pressure is January (30.09"Hg).
The months with the lowest atmospheric pressure are June and September (29.88"Hg).
Average wind speed in September
Oceanside, CA
- Average wind speed in September: 5mph
The windiest months (with the highest average wind speed) are April and May (6mph).
The calmest month (with the lowest average wind speed) is October (4.8mph).
Average humidity in September
Oceanside, CA
- Average humidity in September: 67%
The month with the highest relative humidity is June (73%).
The month with the lowest relative humidity is November (60%).
Average rainfall in September
Oceanside, CA
- Average rainfall in September: 0.31"
The wettest month (with the highest rainfall) is December (1.97").
The driest month (with the least rainfall) is June (0.12").
Average rainfall days in September
Oceanside, CA
- Average rainfall days in September: 4.9 days
The month with the highest number of rainy days is March (8 days).
The month with the least rainy days is June (2.7 days).
Average sea temperature in September
Oceanside, CA
- Average sea temperature in September: 66.9°F
The best month for swimming (with the highest average sea temperature) is August (68°F).
The coldest months (with the lowest average sea temperature) are January and February (58.7°F).
Average daylight in September /
Average sunshine in September
Oceanside, CA
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 18min).
The month with the shortest days is December (Average daylight: 10h and 0min).
- Average sunshine in September: 10h and 30min
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: 6h and 36min).
Average sunshine days in September
Oceanside, CA
- Average sunshine days in September: 22.4 days
The month with the most sunshine days is October (24.2 days).
The month with the least sunshine days is February (20 days).
Average UV index in September
Oceanside, CA
- Average UV index in September: 6
The months with the highest UV index are July, August and September (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 4).
Average cloud cover in September
Oceanside, CA
- Average cloud cover in September: 12
The month with the most cloud cover is December (Cloud cover 25).
The month with the least cloud cover is August (Cloud cover 8).
Average visibility in September
Oceanside, 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).
