September weather forecastPalo Alto, TX
September
Weather in September
September, the first month of the autumn in Palo Alto, is also a hot month, with temperature in the range of an average high of 90.3°F (32.4°C) and an average low of 76.3°F (24.6°C).Temperature
With the arrival of September, Palo Alto notices a mild change in the average high-temperature, sliding from August's torrid 95.9°F (35.5°C) to a tropical 90.3°F (32.4°C). Palo Alto, in September, observes a steady average low-temperature of 76.3°F (24.6°C).Heat index
For September, the heat index is estimated at a blisteringly hot 107.6°F (42°C). Additional precautions are required to avert heat cramps and heat exhaustion. Persistent activity may culminate in heatstroke.It is crucial to understand that heat index figures are for shade and gentle wind conditions. Direct sunlight might cause an increase of up to 15 Fahrenheit (8 Celsius) degrees in the heat index.
Note: The heat index, also known as 'apparent temperature' or 'feels like', is achieved by amalgamating air temperature with the relative humidity readings. An individual's temperature experience can be influenced by extra factors, including metabolic differences, activity levels, and clothing. Realize that direct exposure to sunlight can augment the felt heat, leading to a potential increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular significance for children. Children often miss understanding the importance of rest and rehydration. Thirst usually appears late during dehydration - therefore, maintaining hydration, particularly during long physical activities, is essential.
Perspiration is the body's default response to elevated temperatures, as it promotes the evaporation of sweat to achieve cooling. An increase in relative humidity retards evaporation, subsequently reducing the body's heat removal rate and leading to a sensation of being overly warm. Rising body temperatures due to excess heat retention could signify impending heat disorders.
Humidity
The average relative humidity in September is 70%.Rainfall
The month with the most rainfall is September, when the rain falls for 14.6 days and typically aggregates up to 1.73" (44mm) of precipitation.Snowfall
In Palo Alto, snow does not fall in January, March through November.Daylight
In Palo Alto, the average length of the day in September is 12h and 19min.On the first day of the month, sunrise is at 7:10 am and sunset at 7:51 pm. On the last day of September, sunrise is at 7:23 am and sunset at 7:18 pm CDT.
Sunshine
In Palo Alto, the average sunshine in September is 8.6h.UV index
In September, the average daily maximum UV index in Palo Alto is 7. A UV Index estimate of 6 to 7 represents a high threat to health from exposure to the Sun's UV radiation for average individuals.Note: In September, a regular UV index of 7 translates into these guidelines:
Refrain from overexposure. Fair-skinned individuals could burn in under 20 minutes. Remember that the sun's UV radiation is strongest between 10 a.m. and 4 p.m. Make an effort to avoid direct sun exposure during these hours. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Palo Alto, TX
- Average high temperature in September: 90.3°F
The warmest month (with the highest average high temperature) is August (95.9°F).
The month with the lowest average high temperature is January (65.5°F).
- Average low temperature in September: 76.3°F
The month with the highest average low temperature is August (78.4°F).
The coldest month (with the lowest average low temperature) is January (50.5°F).
Average pressure in September
Palo Alto, TX
- Average pressure in September: 29.91"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.87"Hg).
Average wind speed in September
Palo Alto, TX
- Average wind speed in September: 8.2mph
The windiest month (with the highest average wind speed) is May (11.1mph).
The calmest month (with the lowest average wind speed) is September (8.2mph).
Average humidity in September
Palo Alto, TX
- Average humidity in September: 70%
The month with the highest relative humidity is May (74%).
The month with the lowest relative humidity is August (65%).
Average rainfall in September
Palo Alto, TX
- Average rainfall in September: 1.73"
The wettest month (with the highest rainfall) is September (1.73").
The driest month (with the least rainfall) is February (0.47").
Average rainfall days in September
Palo Alto, TX
- Average rainfall days in September: 14.6 days
The month with the highest number of rainy days is September (14.6 days).
The month with the least rainy days is August (6.7 days).
Average snowfall in September
Palo Alto, TX
- Average snowfall in September: 0"
The months with the highest snowfall are February and December (0.04").
The months with the least snowfall are January, March, April, May, June, July, August, September, October and November (0").
Average snowfall days in September
Palo Alto, TX
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (0.2 days).
The months with the least snowfall days are January, March, April, May, June, July, August, September, October and November (0 days).
Average daylight in September /
Average sunshine in September
Palo Alto, TX
- Average daylight in September: 12h and 18min
The month with the longest days is June (Average daylight: 13h and 54min).
The month with the shortest days is December (Average daylight: 10h and 24min).
- Average sunshine in September: 8h and 36min
The month with the most sunshine is July (Average sunshine: 11h and 12min).
The month with the least sunshine is December (Average sunshine: 4h and 54min).
Average sunshine days in September
Palo Alto, TX
- Average sunshine days in September: 13 days
The month with the most sunshine days is August (22.9 days).
The month with the least sunshine days is September (13 days).
Average UV index in September
Palo Alto, TX
- Average UV index in September: 7
The month with the highest UV index is July (UV index 8).
The months with the lowest UV index are January and December (UV index 4).
Average cloud cover in September
Palo Alto, TX
- Average cloud cover in September: 30
The months with the most cloud cover are February and December (Cloud cover 45).
The month with the least cloud cover is August (Cloud cover 18).
Average visibility in September
Palo Alto, TX
- 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).
