September weather forecastMonte Sereno, CA
September
Weather in September
The first month of the autumn, September, is still a warm month in Monte Sereno, California, with temperature in the range of an average high of 78.4°F (25.8°C) and an average low of 55.6°F (13.1°C).Temperature
September denotes a minimal variation in the average high-temperature to a still moderately hot 78.4°F (25.8°C) from August's 80.4°F (26.9°C). September nights in Monte Sereno bring a pronounced temperature shift, with averages hovering around a refreshing 55.6°F (13.1°C).Humidity
July and September, with an average relative humidity of 62%, are the least humid months in Monte Sereno.Rainfall
In September, the rain falls for 2.5 days. Throughout September, 0.12" (3mm) of precipitation is accumulated. In Monte Sereno, during the entire year, the rain falls for 68.6 days and collects up to 11.57" (294mm) of precipitation.Daylight
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 7:36 pm. On the last day of September, in Monte Sereno, sunrise is at 7:03 am and sunset at 6:52 pm PDT.
Sunshine
The average sunshine in September is 11.1h.UV index
The average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to UV radiation for the ordinary person.Note: In September, the maximum UV index of 5 translates into these guidelines:
Make use of precautions - It is urged to ward off sun damage. Limiting sun exposure during midday hours helps in reducing the harmful effects of UV radiation. Fend off the sun's harsh rays with appropriate clothing, a wide-brim hat, and UV-protective sunglasses.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Monte Sereno, CA
- Average high temperature in September: 78.4°F
The warmest month (with the highest average high temperature) is July (80.8°F).
The month with the lowest average high temperature is December (56.7°F).
- Average low temperature in September: 55.6°F
The month with the highest average low temperature is August (55.9°F).
The coldest month (with the lowest average low temperature) is February (43.5°F).
Average pressure in September
Monte Sereno, 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 and September (29.92"Hg).
Average wind speed in September
Monte Sereno, CA
- Average wind speed in September: 4.5mph
The windiest month (with the highest average wind speed) is April (5.9mph).
The calmest months (with the lowest average wind speed) are August, September, October and November (4.5mph).
Average humidity in September
Monte Sereno, CA
- Average humidity in September: 62%
The month with the highest relative humidity is March (74%).
The months with the lowest relative humidity are July and September (62%).
Average rainfall in September
Monte Sereno, CA
- Average rainfall in September: 0.12"
The wettest month (with the highest rainfall) is February (2.2").
The driest months (with the least rainfall) are July and August (0.04").
Average rainfall days in September
Monte Sereno, CA
- Average rainfall days in September: 2.5 days
The month with the highest number of rainy days is March (12.5 days).
The month with the least rainy days is August (0.9 days).
Average daylight in September /
Average sunshine in September
Monte Sereno, 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: 11h and 6min
The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 6h and 0min).
Average sunshine days in September
Monte Sereno, CA
- Average sunshine days in September: 26.4 days
The month with the most sunshine days is August (29.2 days).
The month with the least sunshine days is March (17.3 days).
Average UV index in September
Monte Sereno, 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 January, February, November and December (UV index 3).
Average cloud cover in September
Monte Sereno, CA
- Average cloud cover in September: 10
The month with the most cloud cover is March (Cloud cover 35).
The month with the least cloud cover is July (Cloud cover 6).
Average visibility in September
Monte Sereno, 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).
