September weather forecastBerkeley, CA
September
Weather in September
The farewell to summer in September is marked with temperatures averagely ranging from 56.8°F (13.8°C) to 76.6°F (24.8°C). Remarkably, this period has the highest temperature readings of the year in Berkeley, California. Further fall in cloud percentage to 13% permits clear, blue skies and a lower rainfall amounting to only 0.08" (2mm) over 2.3 days. The wind speeds dip slightly to 5.6mph (9km/h), while the daylight hours are shortened to 12.4. Seasonal transitions are noticeable as the UV index drops to 4, matching the cooling climate.Temperature
In Berkeley, the average temperatures in September are the highest, with a peak at 76.6°F (24.8°C) and a low of 56.8°F (13.8°C).Humidity
The average relative humidity in September in Berkeley, California, is 65%.Rainfall
June through September are months with the least rain in Berkeley when the rain falls for 2.3 days and typically aggregates up to 0.08" (2mm) of rain.Daylight
In Berkeley, California, the average length of the day in September is 12h and 25min.On the first day of the month, sunrise is at 6:39 am and sunset at 7:37 pm. On the last day of September, in Berkeley, sunrise is at 7:04 am and sunset at 6:53 pm PDT.
Sunshine
In Berkeley, the average sunshine in September is 11h.UV index
The months with the highest UV index are April through September, with an average maximum UV index of 5. A UV Index value of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The maximum daily UV index of 5 in September interprets into the following recommendations:
Prioritize safety - The need to safeguard skin and eyes from harm is emphasized. The Sun is at its harshest during midday; protect yourself by staying in shaded areas and minimizing exposure. Tightly woven clothing, when worn loosely, shields effectively against the Sun.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Berkeley, CA
- Average high temperature in September: 76.6°F
The warmest month (with the highest average high temperature) is September (76.6°F).
The month with the lowest average high temperature is December (55.4°F).
- Average low temperature in September: 56.8°F
The month with the highest average low temperature is September (56.8°F).
The coldest month (with the lowest average low temperature) is January (44.2°F).
Average pressure in September
Berkeley, 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
Berkeley, CA
- Average wind speed in September: 5.6mph
The windiest month (with the highest average wind speed) is May (7.3mph).
The calmest month (with the lowest average wind speed) is November (5mph).
Average humidity in September
Berkeley, CA
- Average humidity in September: 65%
The month with the highest relative humidity is March (75%).
The month with the lowest relative humidity is October (64%).
Average rainfall in September
Berkeley, CA
- Average rainfall in September: 0.08"
The wettest month (with the highest rainfall) is February (1.1").
The driest months (with the least rainfall) are June, July, August and September (0.08").
Average rainfall days in September
Berkeley, CA
- Average rainfall days in September: 2.3 days
The month with the highest number of rainy days is March (8.7 days).
The month with the least rainy days is August (1.5 days).
Average daylight in September /
Average sunshine in September
Berkeley, 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 36min).
- Average sunshine in September: 11h and 0min
The month with the most sunshine is July (Average sunshine: 11h and 54min).
The month with the least sunshine is December (Average sunshine: 5h and 48min).
Average sunshine days in September
Berkeley, CA
- Average sunshine days in September: 24.9 days
The month with the most sunshine days is October (26 days).
The month with the least sunshine days is February (20.5 days).
Average UV index in September
Berkeley, CA
- Average UV index in September: 5
The months with the highest UV index are April, May, June, July, August and September (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 3).
Average cloud cover in September
Berkeley, CA
- Average cloud cover in September: 13
The month with the most cloud cover is March (Cloud cover 36).
The month with the least cloud cover is July (Cloud cover 11).
Average visibility in September
Berkeley, 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).
