September weather forecastMadison, CA
September
Weather in September
September, the first month of the autumn in Madison, is still a hot month, with an average temperature varying between 88.7°F (31.5°C) and 59°F (15°C).Temperature
With the start of September, Madison measures an average high-temperature of a still hot 88.7°F (31.5°C), not significantly differing from August's 93.2°F (34°C). Madison anticipates a considerable cooling off from the daytime high to an average minimum temperature of 59°F (15°C) in September.Heat index
September's average heat index is estimated at a tropical 89.6°F (32°C). When exposure and activity are sustained, they could induce fatigue, with a chance of heat cramps.When considering the heat index, it's pivotal to note it is for shade and mild wind conditions. A rise of up to 15 Fahrenheit (8 Celsius) degrees in the heat index could result from direct sunlight.
Note: The heat index, also known as 'feels like' or 'apparent temperature', gauges the sensation of temperature factoring in the air's moisture content. One's weather perception can be influenced by a range of factors including metabolic differences, being pregnant, and their level of physical activity. It is noteworthy that being in direct sunlight can enhance the weather's impact, raising the heat index by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Children frequently underestimate the importance of resting and drinking fluids. Thirst is a symptom of advanced dehydration - hence the need to hydrate regularly, especially during protracted physical exercises.
Humidity
The least humid month is September, with an average relative humidity of 43%.Rainfall
In Madison, during September, the rain falls for 1.8 days and regularly aggregates up to 0.08" (2mm) of precipitation. In Madison, California, during the entire year, the rain falls for 70.7 days and collects up to 12.52" (318mm) of precipitation.Snowfall
In Madison, snow does not fall in January through November.Daylight
In Madison, the average length of the day in September is 12h and 25min.On the first day of the month, sunrise is at 6:37 am and sunset at 7:37 pm. On the last day of September, sunrise is at 7:03 am and sunset at 6:51 pm PDT.
Sunshine
In Madison, the average sunshine in September is 11.2h.UV index
In Madison, the average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a medium vulnerability from unprotected exposure to Sun's UV rays for the average person.Note: An average UV index of 5 in September transforms into this advice:
Put precautions into practice - Ensuring skin and eye safety is a necessity. Given the potency of the midday Sun's UV radiation, one should avoid prolonged exposure. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Madison, CA
- Average high temperature in September: 88.7°F
The warmest month (with the highest average high temperature) is July (93.9°F).
The month with the lowest average high temperature is December (54.3°F).
- Average low temperature in September: 59°F
The months with the highest average low temperature are July and August (59.2°F).
The coldest months (with the lowest average low temperature) are January and December (41.5°F).
Average pressure in September
Madison, CA
- Average pressure in September: 29.91"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in September
Madison, CA
- Average wind speed in September: 5mph
The windiest month (with the highest average wind speed) is February (6.3mph).
The calmest month (with the lowest average wind speed) is September (5mph).
Average humidity in September
Madison, CA
- Average humidity in September: 43%
The month with the highest relative humidity is March (74%).
The month with the lowest relative humidity is September (43%).
Average rainfall in September
Madison, CA
- Average rainfall in September: 0.08"
The wettest month (with the highest rainfall) is February (2.52").
The driest months (with the least rainfall) are July and August (0.04").
Average rainfall days in September
Madison, CA
- Average rainfall days in September: 1.8 days
The month with the highest number of rainy days is March (12.6 days).
The month with the least rainy days is July (0.8 days).
Average snowfall days in September
Madison, 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
Madison, 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 12min
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 42min).
Average sunshine days in September
Madison, CA
- Average sunshine days in September: 28 days
The months with the most sunshine days are July and August (29.3 days).
The month with the least sunshine days is March (16.8 days).
Average UV index in September
Madison, 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
Madison, CA
- Average cloud cover in September: 8
The month with the most cloud cover is March (Cloud cover 38).
The month with the least cloud cover is July (Cloud cover 4).
Average visibility in September
Madison, 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).
