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
As August shifts into September, a minor alteration in temperatures is observed, with average highs reducing from a blistering 105.1°F (40.6°C) to a torrid 99.5°F (37.5°C). During the nights in September, Winterhaven observes an average low-temperature of 81°F (27.2°C).Humidity
In Winterhaven, the average relative humidity in September is 29%.Rainfall
The wettest months are July and September, with an average 0.39" (10mm) of rainfall.Daylight
In September, the average length of the day in Winterhaven is 12h and 22min.On the first day of the month, sunrise is at 6:13 am and sunset at 7:02 pm. On the last day of September, sunrise is at 6:32 am and sunset at 6:23 pm PDT.
Sunshine
In September, the average sunshine in Winterhaven is 9.8h.UV index
June through September, with an average maximum UV index of 8, are months with the highest UV index in Winterhaven. A UV Index value of 8 to 10 symbolizes a very high health risk from exposure to the Sun's UV radiation for ordinary individuals.Note: In September, the maximum UV index of 8 suggests this advice:
Skin and eyes are vulnerable without protection. Ensure you always take precautions. Stay in the shade and avoid direct Sun exposure from 10 a.m. to 4 p.m., a time when UV radiation is at its strongest, and remember that parasols or canopies do not offer full protection. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized.
Frequently asked questions
How hot does it get in Winterhaven in September?
What is the average humidity in September in Winterhaven?
What is the wettest month in Winterhaven?
How much does it rain in Winterhaven in September?
How many hours of daylight does Winterhaven have in September?
When is the sunrise / sunset in September in Winterhaven?
How long on average sun shines in September in Winterhaven?
What is the month with the highest UV index in Winterhaven?
What is the UV index reading in September in Winterhaven?
Average temperature in September
Winterhaven, CA
- Average high temperature in September: 99.5°F
The warmest month (with the highest average high temperature) is July (105.3°F).
The month with the lowest average high temperature is December (66°F).
- Average low temperature in September: 81°F
The month with the highest average low temperature is August (86.4°F).
The coldest month (with the lowest average low temperature) is December (50.5°F).
Average pressure in September
Winterhaven, CA
- Average pressure in September: 29.78"Hg
The month with the highest atmospheric pressure is January (30.07"Hg).
The month with the lowest atmospheric pressure is June (29.74"Hg).
Average wind speed in September
Winterhaven, CA
- Average wind speed in September: 6.9mph
The windiest months (with the highest average wind speed) are April and July (8.5mph).
The calmest month (with the lowest average wind speed) is November (6.6mph).
Average humidity in September
Winterhaven, CA
- Average humidity in September: 29%
The month with the highest relative humidity is December (38%).
The month with the lowest relative humidity is June (22%).
Average rainfall in September
Winterhaven, CA
- Average rainfall in September: 0.39"
The wettest months (with the highest rainfall) are July and September (0.39").
The driest months (with the least rainfall) are May and June (0.04").
Average rainfall days in September
Winterhaven, CA
- Average rainfall days in September: 4.6 days
The month with the highest number of rainy days is July (5.8 days).
The month with the least rainy days is May (0.8 days).
Average daylight in September /
Average sunshine in September
Winterhaven, CA
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 18min).
The month with the shortest days is December (Average daylight: 10h and 0min).
- Average sunshine in September: 9h and 5min
The month with the most sunshine is June (Average sunshine: 12h and 12min).
The month with the least sunshine is December (Average sunshine: 7h and 12min).
Average sunshine days in September
Winterhaven, CA
- Average sunshine days in September: 23 days
The month with the most sunshine days is May (30.2 days).
The month with the least sunshine days is July (22.1 days).
Average UV index in September
Winterhaven, CA
- Average UV index in September: 8
The months with the highest UV index are June, July, August and September (UV index 8).
The months with the lowest UV index are November and December (UV index 4).
Average cloud cover in September
Winterhaven, CA
- Average cloud cover in September: 8
The month with the most cloud cover is December (Cloud cover 17).
The month with the least cloud cover is June (Cloud cover 5).
Average visibility in September
Winterhaven, 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).
Winterhaven, California, USA
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