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
Stepping into September, Hayward records an average high-temperature of a still warm 79°F (26.1°C), almost consistent with August. Hayward, after hot September days, encounters a marked drop to an average nighttime temperature of 56.3°F (13.5°C).Humidity
September is the least humid month, with an average relative humidity of 61%.Rainfall
In Hayward, during September, the rain falls for 2.1 days and regularly aggregates up to 0.12" (3mm) of precipitation. In Hayward, during the entire year, the rain falls for 69.2 days and collects up to 11.1" (282mm) of precipitation.Daylight
The average length of the day in September in Hayward is 12h and 25min.On the first day of September, sunrise is at 6:39 am and sunset at 7:36 pm. On the last day of the month, sunrise is at 7:03 am and sunset at 6:52 pm PDT.
Sunshine
The average sunshine in September is 11.1h.UV index
The average daily maximum UV index in September in Hayward, California, is 5. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV rays for the average person.Note: In September, a daily maximum UV index of 5 leads to the following instructions:
Preventative actions are necessary - Suggestions to safeguard against sun damage are in order. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit.
Frequently asked questions
What is the average September temperature in Hayward?
What is the least humid month in Hayward?
What is the average humidity in September in Hayward?
How much does it rain in Hayward in September?
What is the average length of the day in September in Hayward?
When is the sunrise / sunset in September in Hayward?
How many hours of sunshine does Hayward have in September?
What is the UV index reading in September in Hayward?
Average temperature in September
Hayward, CA
- Average high temperature in September: 79°F
The warmest month (with the highest average high temperature) is July (80.2°F).
The month with the lowest average high temperature is December (55.9°F).
- Average low temperature in September: 56.3°F
The month with the highest average low temperature is August (56.5°F).
The coldest months (with the lowest average low temperature) are January and December (43.7°F).
Average pressure in September
Hayward, CA
- Average pressure in September: 29.92"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The months with the lowest atmospheric pressure are June, August and September (29.92"Hg).
Average wind speed in September
Hayward, CA
- Average wind speed in September: 5mph
The windiest month (with the highest average wind speed) is May (6.6mph).
The calmest month (with the lowest average wind speed) is November (4.6mph).
Average humidity in September
Hayward, CA
- Average humidity in September: 61%
The month with the highest relative humidity is March (74%).
The month with the lowest relative humidity is September (61%).
Average rainfall in September
Hayward, CA
- Average rainfall in September: 0.12"
The wettest month (with the highest rainfall) is February (2.28").
The driest months (with the least rainfall) are July and August (0.04").
Average rainfall days in September
Hayward, CA
- Average rainfall days in September: 2.1 days
The month with the highest number of rainy days is March (12.4 days).
The month with the least rainy days is August (0.9 days).
Average daylight in September /
Average sunshine in September
Hayward, CA
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in September: 11h and 1min
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
Hayward, CA
- Average sunshine days in September: 27.1 days
The month with the most sunshine days is August (28.9 days).
The month with the least sunshine days is March (17.3 days).
Average UV index in September
Hayward, CA
- Average UV index in September: 5
The month with the highest UV index is June (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 3).
Average cloud cover in September
Hayward, CA
- Average cloud cover in September: 10
The months with the most cloud cover are March and December (Cloud cover 34).
The month with the least cloud cover is July (Cloud cover 7).
Average visibility in September
Hayward, 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).
Hayward, California, USA
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