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
September records an average high-temperature of a still moderately hot 76.5°F (24.7°C), indicating a minor variation from the preceding month. Menlo Park experiences a steady low-temperature of 56.7°F (13.7°C) throughout September.Humidity
The months with the lowest humidity are September and October, with an average relative humidity of 65%.Rainfall
In Menlo Park, in September, during 2.1 rainfall days, 0.08" (2mm) of precipitation is typically accumulated. Throughout the year, there are 63.3 rainfall days, and 9.53" (242mm) of precipitation is accumulated.Daylight
In September, the average length of the day is 12h and 25min.On the first day of the month, sunrise is at 6:39 am and sunset at 7:37 pm. On the last day of September, sunrise is at 7:04 am and sunset at 6:52 pm PDT.
Sunshine
The average sunshine in September in Menlo Park is 11h.UV index
The months with the highest UV index are April through October, with an average maximum UV index of 5. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV rays for average individuals.Note: A typical high UV index of 5 in September suggests the following recommendations:
Take precautions - Protection against sun damage is advised. It's recommended to limit sun exposure when its radiation is at its peak during midday. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense.
Frequently asked questions
What is the temperature in September in Menlo Park?
What is the least humid month in Menlo Park?
What is the average humidity in September in Menlo Park?
How many days does it rain in September in Menlo Park?
What is the average length of the day in September in Menlo Park?
When are sunrise and sunset in September in Menlo Park?
How many hours of sunshine does Menlo Park have in September?
What are the months with the highest UV index in Menlo Park?
What is the UV index reading in September in Menlo Park?
Average temperature in September
Menlo Park, CA
- Average high temperature in September: 76.5°F
The warmest months (with the highest average high temperature) are July and August (77.5°F).
The month with the lowest average high temperature is December (56.3°F).
- Average low temperature in September: 56.7°F
The month with the highest average low temperature is August (57°F).
The coldest months (with the lowest average low temperature) are January and February (45.1°F).
Average pressure in September
Menlo Park, CA
- Average pressure in September: 29.92"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The months with the lowest atmospheric pressure are June and September (29.92"Hg).
Average wind speed in September
Menlo Park, CA
- Average wind speed in September: 4.9mph
The windiest months (with the highest average wind speed) are April and May (6.5mph).
The calmest months (with the lowest average wind speed) are September and October (4.9mph).
Average humidity in September
Menlo Park, CA
- Average humidity in September: 65%
The month with the highest relative humidity is March (74%).
The months with the lowest relative humidity are September and October (65%).
Average rainfall in September
Menlo Park, CA
- Average rainfall in September: 0.08"
The wettest month (with the highest rainfall) is February (2.01").
The driest month (with the least rainfall) is July (0").
Average rainfall days in September
Menlo Park, CA
- Average rainfall days in September: 2.1 days
The month with the highest number of rainy days is March (12.3 days).
The month with the least rainy days is August (0.6 days).
Average daylight in September /
Average sunshine in September
Menlo Park, 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 0min
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
Menlo Park, CA
- Average sunshine days in September: 27.6 days
The month with the most sunshine days is July (30.2 days).
The month with the least sunshine days is March (18 days).
Average UV index in September
Menlo Park, CA
- Average UV index in September: 5
The months with the highest UV index are April, May, June, July, August, September and October (UV index 5).
The months with the lowest UV index are February, November and December (UV index 3).
Average cloud cover in September
Menlo Park, CA
- Average cloud cover in September: 11
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 6).
Average visibility in September
Menlo Park, 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).
Menlo Park, California, USA
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