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 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
The arrival of September corresponds with a minor reduction in the average high-temperature, down from August's tropical 88.2°F (31.2°C) to a warm 82.4°F (28°C). September nights bring a significant cooling from the heat of the day, with averages of 57.9°F (14.4°C).Humidity
In Keene, California, the average relative humidity in September is 32%.Rainfall
The month with the least rainfall is September, when the rain falls for 1.6 days and typically collects 0.12" (3mm) of precipitation.Snowfall
In Keene, snow does not fall in June through October.Daylight
In September, the average length of the day is 12h and 23min.On the first day of September, sunrise is at 6:27 am and sunset at 7:20 pm. On the last day of the month, sunrise is at 6:48 am and sunset at 6:38 pm PDT.
Sunshine
In September, the average sunshine is 10.9h.UV index
In Keene, the average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for the ordinary person.Note: The maximum UV index, 5 during September, leads to the following recommendations:
Put precautions into practice - Ensuring skin and eye safety is a necessity. Limiting sun exposure during midday hours helps in reducing the harmful effects of UV radiation. A hat with a broad brim is indispensable, filtering out up to half of UV rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot is it in September?
What is the average humidity in September?
What is the driest month in Keene?
How much does it rain in September?
When it does not snow?
How many hours of daylight does Keene have in September?
What time are sunrise and sunset in September?
How many hours of sunshine does Keene have in September?
How high is the UV index in September?
Average temperature in September
Keene, CA
- Average high temperature in September: 82.4°F
The warmest month (with the highest average high temperature) is July (88.5°F).
The month with the lowest average high temperature is December (50.5°F).
- Average low temperature in September: 57.9°F
The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is December (34°F).
Average pressure in September
Keene, CA
- Average pressure in September: 29.89"Hg
The month with the highest atmospheric pressure is January (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.86"Hg).
Average wind speed in September
Keene, CA
- Average wind speed in September: 7mph
The windiest month (with the highest average wind speed) is May (9.4mph).
The calmest month (with the lowest average wind speed) is September (7mph).
Average humidity in September
Keene, CA
- Average humidity in September: 32%
The months with the highest relative humidity are February and December (58%).
The month with the lowest relative humidity is August (28%).
Average rainfall in September
Keene, CA
- Average rainfall in September: 0.12"
The wettest month (with the highest rainfall) is December (1.5").
The driest month (with the least rainfall) is September (0.12").
Average rainfall days in September
Keene, CA
- Average rainfall days in September: 1.6 days
The month with the highest number of rainy days is March (7.5 days).
The month with the least rainy days is September (1.6 days).
Average snowfall in September
Keene, CA
- Average snowfall in September: 0"
The month with the highest snowfall is December (5.16").
The months with the least snowfall are June, July, August, September and October (0").
Average snowfall days in September
Keene, CA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (3.8 days).
The months with the least snowfall days are June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Keene, CA
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 30min).
The month with the shortest days is December (Average daylight: 9h and 48min).
- Average sunshine in September: 10h and 5min
The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is January (Average sunshine: 6h and 30min).
Average sunshine days in September
Keene, CA
- Average sunshine days in September: 27.8 days
The month with the most sunshine days is October (28 days).
The month with the least sunshine days is February (20.4 days).
Average UV index in September
Keene, CA
- Average UV index in September: 5
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are November and December (UV index 2).
Average cloud cover in September
Keene, CA
- Average cloud cover in September: 6
The month with the most cloud cover is March (Cloud cover 29).
The month with the least cloud cover is August (Cloud cover 5).
Average visibility in September
Keene, 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).
Keene, California, USA
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