September weather forecastWilton, CA
September
Weather in September
September, the first month of the autumn in Wilton, is still a hot month, with temperature in the range of an average low of 58.5°F (14.7°C) and an average high of 88.5°F (31.4°C).Temperature
At the onset of September, Wilton records an average high-temperature of a still tropical 88.5°F (31.4°C), showing little deviation from the preceding month. Marked by a significant drop from the daytime highs, Wilton's average low-temperature in September stands at a moderate 58.5°F (14.7°C).Heat index
September's mean heat index is computed to be a tropical 89.6°F (32°C). Exhaustion might be the outcome of enduring exposure and continuous activity, with a risk of heat cramps.In reference to the heat index, it's for places in shade and with a slight wind. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'real feel', is the outcome of merging air's temperature and its humidity metrics. Factors such as metabolic variations, being pregnant, and physical activity can impact an individual's weather perception. In direct sunlight, the heat's impact can be heightened, potentially leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are largely significant for babies and toddlers. Kids are generally in more danger than adults because they perspire less. Their large skin surface area compared to their small bodies and the excessive heat due to their actions raises their risk.
Humidity
With an average relative humidity of 44%, September is the least humid month.Rainfall
In September, in Wilton, the rain falls for 2.3 days. Throughout September, 0.2" (5mm) of precipitation is accumulated. Throughout the year, in Wilton, there are 73.3 rainfall days, and 15.63" (397mm) of precipitation is accumulated.Snowfall
January through November are months without snowfall.Daylight
In September, the average length of the day in Wilton is 12h and 25min.On the first day of September, sunrise is at 6:35 am and sunset at 7:34 pm. On the last day of the month, sunrise is at 7:00 am and sunset at 6:48 pm PDT.
Sunshine
In Wilton, California, the average sunshine in September is 11.3h.UV index
The average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for the average person.Note: A maximum high UV index of 5 in September translates into the following recommendations:
Ensure safety - Recommendations to avert sunburn are presented. Avoid the Sun's strongest UV rays by seeking shade and limiting exposure during midday. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Wilton, CA
- Average high temperature in September: 88.5°F
The warmest month (with the highest average high temperature) is July (94.3°F).
The month with the lowest average high temperature is December (54.7°F).
- Average low temperature in September: 58.5°F
The month with the highest average low temperature is August (59.2°F).
The coldest months (with the lowest average low temperature) are January and December (40.8°F).
Average pressure in September
Wilton, CA
- Average pressure in September: 29.92"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in September
Wilton, CA
- Average wind speed in September: 4.1mph
The windiest month (with the highest average wind speed) is February (5.7mph).
The calmest month (with the lowest average wind speed) is September (4.1mph).
Average humidity in September
Wilton, CA
- Average humidity in September: 44%
The month with the highest relative humidity is March (75%).
The month with the lowest relative humidity is September (44%).
Average rainfall in September
Wilton, CA
- Average rainfall in September: 0.2"
The wettest month (with the highest rainfall) is March (2.91").
The driest months (with the least rainfall) are July and August (0.04").
Average rainfall days in September
Wilton, CA
- Average rainfall days in September: 2.3 days
The month with the highest number of rainy days is March (13.3 days).
The months with the least rainy days are June, July and August (1.4 days).
Average snowfall days in September
Wilton, CA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is December (0.1 days).
The months with the least snowfall days are January, February, March, April, May, June, July, August, September, October and November (0 days).
Average daylight in September /
Average sunshine in September
Wilton, CA
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in September: 11h and 18min
The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 5h and 48min).
Average sunshine days in September
Wilton, CA
- Average sunshine days in September: 26.9 days
The month with the most sunshine days is July (29.1 days).
The month with the least sunshine days is March (16.9 days).
Average UV index in September
Wilton, CA
- Average UV index in September: 5
The months with the highest UV index are June and July (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 3).
Average cloud cover in September
Wilton, CA
- Average cloud cover in September: 8
The month with the most cloud cover is March (Cloud cover 37).
The month with the least cloud cover is July (Cloud cover 4).
Average visibility in September
Wilton, 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).
