Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
As September takes hold, the average high-temperature is a still hot 88.5°F (31.4°C), nearly mirroring that of the previous month. The nighttime temperature during September exhibits a clear drop from daytime highs, settling at a mild 58.6°F (14.8°C).Heat index
Throughout September, the heat index is estimated at a tropical 89.6°F (32°C). If activity and exposure persist, they could induce fatigue, leading to possible heat cramps.Remember that heat index calculations are made for conditions in the shade with light wind. The presence of direct sunlight can raise the heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'real feel', reflects the feeling of heat when considering both air temperature and humidity. Factors including metabolic differences, physical activity, and clothing are additional elements that influence the individual's temperature experience. Being under direct sunshine can magnify the heat experience, possibly pushing up the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly meaningful for babies and toddlers. Young ones often ignore the need to take a break and drink fluids. Thirst is a late-stage symptom of dehydration - hence, maintaining hydration, particularly during extended physical activities, is crucial.
Humidity
In Herald, the average relative humidity in September is 46%.Rainfall
In Herald, during September, the rain falls for 1.5 days and regularly aggregates up to 0.08" (2mm) of precipitation. In Herald, during the entire year, the rain falls for 63.8 days and collects up to 12.6" (320mm) of precipitation.Snowfall
January through November are months without snowfall in Herald.Daylight
In Herald, the average length of the day in September 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
The average sunshine in September is 11.3h.UV index
The average daily maximum UV index in September in Herald is 5. A UV Index estimate of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV rays for average individuals.Note: The maximum daily UV index, 5 in September, converts into the following recommendations:
Undertake precautions - Obligation exists to protect against skin and eye damage. Limiting sun exposure during midday hours helps in reducing the harmful effects of UV radiation. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes.
Frequently asked questions
Is it hot in Herald during September?
What is the average humidity in September in Herald?
How many days does it rain in September in Herald?
When it does not snow in Herald?
How many hours of daylight does Herald have in September?
When is the sunrise / sunset in September in Herald?
How long on average sun shines in September in Herald?
How high is the UV index in September in Herald?
Average temperature in September
Herald, CA
- Average high temperature in September: 88.5°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 (55°F).
- Average low temperature in September: 58.6°F
The month with the highest average low temperature is August (58.8°F).
The coldest month (with the lowest average low temperature) is December (41°F).
Average pressure in September
Herald, 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
Herald, CA
- Average wind speed in September: 4.6mph
The windiest months (with the highest average wind speed) are February and June (5.8mph).
The calmest month (with the lowest average wind speed) is November (4.4mph).
Average humidity in September
Herald, CA
- Average humidity in September: 46%
The month with the highest relative humidity is March (75%).
The month with the lowest relative humidity is July (45%).
Average rainfall in September
Herald, CA
- Average rainfall in September: 0.08"
The wettest month (with the highest rainfall) is February (2.4").
The driest months (with the least rainfall) are July and August (0.04").
Average rainfall days in September
Herald, CA
- Average rainfall days in September: 1.5 days
The month with the highest number of rainy days is March (12.4 days).
The month with the least rainy days is June (0.9 days).
Average snowfall days in September
Herald, 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
Herald, CA
- Average daylight in September: 12h and 2min
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 36min).
- Average sunshine in September: 11h and 2min
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 54min).
Average sunshine days in September
Herald, CA
- Average sunshine days in September: 27.5 days
The month with the most sunshine days is August (29.3 days).
The month with the least sunshine days is March (17.8 days).
Average UV index in September
Herald, CA
- Average UV index in September: 5
The month with the highest UV index is June (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 3).
Average cloud cover in September
Herald, CA
- Average cloud cover in September: 7
The month with the most cloud cover is March (Cloud cover 35).
The month with the least cloud cover is July (Cloud cover 4).
Average visibility in September
Herald, 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).
Herald, California, USA
Weather forecast for your location
2. Allow the app to use your location
