Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average sea temperature in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
Peak temperatures are observed in August and September, averaging a high-temperature of 73°F (22.8°C).Humidity
In September, the average relative humidity in Rio del Mar, California, is 70%.Rainfall
In September, the rain falls for 2.7 days. Throughout September, 0.12" (3mm) of precipitation is accumulated. Throughout the year, there are 77.9 rainfall days, and 14.45" (367mm) of precipitation is accumulated.Ocean temperature
August and September, with an average ocean temperature of 58.1°F (14.5°C), are months with the warmest seawater in Rio del Mar.Note: Swimming at temperatures less than 50°F (10°C) in 58.1°F (14.5°C) is feasible with the right swimsuit; if not, expect cold shock and breathlessness. A quick swim at 55.4°F (13°C) without adequate warmth can be discomforting.
Daylight
In Rio del Mar, the average length of the day in September is 12h and 24min.On the first day of the month, sunrise is at 6:39 am and sunset at 7:35 pm. On the last day of September, sunrise is at 7:02 am and sunset at 6:51 pm PDT.
Sunshine
The average sunshine in September in Rio del Mar is 10.9h.UV index
The months with the highest UV index in Rio del Mar are June through September, with an average maximum UV index of 5. A UV Index reading of 3 to 5 represents a medium vulnerability from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The maximum daily UV index of 5 during September translates into the following directions:
Be vigilant - Preventing sunburn is recommended. Avoiding the Sun's peak radiation during midday hours is essential for health and safety. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What time of the year is the hottest in Rio del Mar?
What are September temperatures in Rio del Mar?
What is the average humidity in September in Rio del Mar?
How much does it rain in Rio del Mar in September?
What are the months with the warmest ocean in Rio del Mar?
What is the ocean temperature in September in Rio del Mar?
How many hours of daylight does Rio del Mar have in September?
What time are sunrise and sunset in September in Rio del Mar?
How many hours of sunshine does Rio del Mar have in September?
What are the months with the highest UV index in Rio del Mar?
How high is the UV index in September in Rio del Mar?
Average temperature in September
Rio del Mar, CA
- Average high temperature in September: 73°F
The warmest months (with the highest average high temperature) are August and September (73°F).
The month with the lowest average high temperature is December (57.2°F).
- Average low temperature in September: 55.2°F
The month with the highest average low temperature is September (55.2°F).
The coldest month (with the lowest average low temperature) is February (45.5°F).
Average pressure in September
Rio del Mar, CA
- Average pressure in September: 29.92"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is September (29.92"Hg).
Average wind speed in September
Rio del Mar, CA
- Average wind speed in September: 5.7mph
The windiest month (with the highest average wind speed) is April (7.4mph).
The calmest months (with the lowest average wind speed) are July and August (5.5mph).
Average humidity in September
Rio del Mar, CA
- Average humidity in September: 70%
The month with the highest relative humidity is March (75%).
The month with the lowest relative humidity is October (68%).
Average rainfall in September
Rio del Mar, CA
- Average rainfall in September: 0.12"
The wettest month (with the highest rainfall) is December (2.8").
The driest months (with the least rainfall) are July and August (0.04").
Average rainfall days in September
Rio del Mar, CA
- Average rainfall days in September: 2.7 days
The month with the highest number of rainy days is March (13.4 days).
The month with the least rainy days is August (1.2 days).
Average sea temperature in September
Rio del Mar, CA
- Average sea temperature in September: 58.1°F
The best months for swimming (with the highest average sea temperature) are August and September (58.1°F).
The coldest month (with the lowest average sea temperature) is April (53.8°F).
Average daylight in September /
Average sunshine in September
Rio del Mar, CA
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 42min).
- Average sunshine in September: 10h and 5min
The month with the most sunshine is July (Average sunshine: 11h and 42min).
The month with the least sunshine is December (Average sunshine: 5h and 48min).
Average sunshine days in September
Rio del Mar, CA
- Average sunshine days in September: 26.3 days
The month with the most sunshine days is August (27.8 days).
The month with the least sunshine days is March (16.4 days).
Average UV index in September
Rio del Mar, CA
- Average UV index in September: 5
The months with the highest UV index are June, July, August and September (UV index 5).
The months with the lowest UV index are February and November (UV index 3).
Average cloud cover in September
Rio del Mar, CA
- Average cloud cover in September: 15
The month with the most cloud cover is March (Cloud cover 38).
The months with the least cloud cover are July and September (Cloud cover 15).
Average visibility in September
Rio del Mar, 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).
Rio del Mar, California, USA
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