September weather forecastSanta Cruz, CA
September
Weather in September
September in Santa Cruz brings gradual changes to central California's coastal weather. After the zenith of summer, the weather begins calming down, with the high temperature dropping slightly from August. Even though there's a slight jump in rainfall to 0.12" (3mm), rainfall days are few and far between. Sunny days are just as prevalent, and Santa Cruz holds onto the fading summer sparkle under a clear sky. Outdoor events and festivities find great ground under the September sun, celebrating the spirit and beauty of Santa Cruz.Temperature
The months of August and September bring the highest temperatures in Santa Cruz, averaging a high of 73°F (22.8°C).Humidity
The average relative humidity in September is 70%.Rainfall
In Santa Cruz, in September, it is raining for 2.7 days, with typically 0.12" (3mm) of accumulated precipitation. Throughout the year, in Santa Cruz, there are 77.9 rainfall days, and 14.45" (367mm) of precipitation is accumulated.Ocean temperature
The month with the warmest seawater in Santa Cruz, California, is September, with an average ocean temperature of 58.1°F (14.5°C).Note: Swimming in 58.1°F (14.5°C) poses a severe threat. Even short exposure to 55.4°F (13°C) is chilling, and going below 50°F (10°C) can cause breathing irregularities and intense cold shock, based on one's stamina.
Daylight
The average length of the day in September in Santa Cruz is 12h and 24min.On the first day of the month, sunrise is at 6:39 am and sunset at 7:36 pm. On the last day of September, sunrise is at 7:03 am and sunset at 6:52 pm PDT.
Sunshine
In September, the average sunshine in Santa Cruz is 10.9h.UV index
June through September, with an average maximum UV index of 5, are months with the highest UV index in Santa Cruz. A UV Index reading of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for the ordinary person.Note: In September, the maximum UV index of 5 suggests these recommendations:
Take care. Persons with lighter skin might suffer burns in less than 30 minutes. Around midday, solar radiation is most harmful; hence, exposure should be limited. 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
Santa Cruz, 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
Santa Cruz, 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
Santa Cruz, 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
Santa Cruz, 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
Santa Cruz, 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
Santa Cruz, 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
Santa Cruz, CA
- Average sea temperature in September: 58.2°F
The best month for swimming (with the highest average sea temperature) is September (58.2°F).
The coldest month (with the lowest average sea temperature) is April (53.9°F).
Average daylight in September /
Average sunshine in September
Santa Cruz, CA
- Average daylight in September: 12h and 24min
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 54min
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
Santa Cruz, 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
Santa Cruz, 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
Santa Cruz, 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
Santa Cruz, 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).
