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 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
With the onset of September, the average high-temperature registers at a warm 84.9°F (29.4°C), subtly different from August's 86.5°F (30.3°C). Montebello's average low-temperature for the month of September records at a comfortable 64.8°F (18.2°C).Heat index
The heat index in September is calculated to be a hot 87.8°F (31°C). Long-standing exposure and activity could induce a feeling of tiredness and lead to heat cramps.Consider that heat index readings are for situations in the shade and light wind. Exposure to the sun directly might heighten the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'real feel', gives an indication of how one might feel in terms of heat after considering humidity. The impression of weather on a person can be swayed by additional aspects, including metabolic variations, pregnancy, and activity levels. Take note that direct exposure to the sun can increase the felt temperature, possibly adding 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values hold particular significance for children. Young ones often underestimate the need for rest and rehydration. Thirst appears late in dehydration - hence, it is important to keep hydrated, particularly during prolonged physical activities.
Humidity
In September, the average relative humidity is 53%.Rainfall
In Montebello, California, during September, the rain falls for 2.3 days and regularly aggregates up to 0.12" (3mm) of precipitation. Throughout the year, there are 40.9 rainfall days, and 6.18" (157mm) of precipitation is accumulated.Daylight
In September, the average length of the day in Montebello is 12h and 22min.On the first day of September, sunrise is at 6:26 am and sunset at 7:17 pm. On the last day of the month, sunrise is at 6:46 am and sunset at 6:37 pm PDT.
Sunshine
The average sunshine in September in Montebello is 10.6h.UV index
The average daily maximum UV index in September in Montebello is 6. A UV Index reading of 6 to 7 represents a high health hazard from unprotected exposure to Sun's UV rays for average individuals.Note: An average maximum UV index of 6 in September leads to these recommendations:
Evade overexposure. Individuals with fair skin risk burning in under 20 minutes. The Sun emits the most powerful UV radiation between 10 a.m. and 4 p.m. Try to avoid direct sunlight during this period. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot is it in Montebello in September?
What is the average humidity in September in Montebello?
How much does it rain in Montebello in September?
How many hours of daylight does Montebello have in September?
When is the sunrise / sunset in September in Montebello?
How long on average sun shines in September in Montebello?
What is the UV index reading in September in Montebello?
Average temperature in September
Montebello, CA
- Average high temperature in September: 84.9°F
The warmest month (with the highest average high temperature) is August (86.5°F).
The month with the lowest average high temperature is December (64.9°F).
- Average low temperature in September: 64.8°F
The month with the highest average low temperature is August (65.8°F).
The coldest month (with the lowest average low temperature) is February (48.9°F).
Average pressure in September
Montebello, CA
- Average pressure in September: 29.89"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed in September
Montebello, CA
- Average wind speed in September: 4.7mph
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 and October (4.7mph).
Average humidity in September
Montebello, CA
- Average humidity in September: 53%
The month with the highest relative humidity is June (62%).
The month with the lowest relative humidity is November (48%).
Average rainfall in September
Montebello, CA
- Average rainfall in September: 0.12"
The wettest month (with the highest rainfall) is December (1.3").
The driest month (with the least rainfall) is June (0.04").
Average rainfall days in September
Montebello, CA
- Average rainfall days in September: 2.3 days
The month with the highest number of rainy days is March (6 days).
The month with the least rainy days is June (1.2 days).
Average daylight in September /
Average sunshine in September
Montebello, CA
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).
- Average sunshine in September: 10h and 4min
The months with the most sunshine are July and August (Average sunshine: 12h and 0min).
The months with the least sunshine are January, February and December (Average sunshine: 6h and 48min).
Average sunshine days in September
Montebello, CA
- Average sunshine days in September: 26 days
The month with the most sunshine days is August (27.6 days).
The month with the least sunshine days is February (22.5 days).
Average UV index in September
Montebello, CA
- Average UV index in September: 6
The month with the highest UV index is August (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 4).
Average cloud cover in September
Montebello, CA
- Average cloud cover in September: 9
The months with the most cloud cover are March and December (Cloud cover 22).
The month with the least cloud cover is August (Cloud cover 5).
Average visibility in September
Montebello, 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).
Montebello, California, USA
Weather forecast for your location
2. Allow the app to use your location