May weather forecastPalo Alto, CA
May
Weather in May
The last month of the spring, May, is an agreeable month in Palo Alto, California, with an average temperature fluctuating between 68.2°F (20.1°C) and 49.6°F (9.8°C).Temperature
The beginning of May records an average high-temperature of an agreeable 68.2°F (20.1°C), marking a negligible difference from April's 64.9°F (18.3°C). Throughout May, Palo Alto witnesses a nighttime temperature average of 49.6°F (9.8°C).Humidity
In Palo Alto, the average relative humidity in May is 69%.Rainfall
In Palo Alto, in May, during 4.4 rainfall days, 0.47" (12mm) of precipitation is typically accumulated. Throughout the year, there are 63.3 rainfall days, and 9.53" (242mm) of precipitation is accumulated.Daylight
In Palo Alto, the average length of the day in May is 14h and 12min.On the first day of May, sunrise is at 6:12 am and sunset at 7:58 pm. On the last day of the month, sunrise is at 5:49 am and sunset at 8:23 pm PDT.
Sunshine
In Palo Alto, the average sunshine in May is 10.9h.UV index
April through October, with an average maximum UV index of 5, are months with the highest UV index. A UV Index reading of 3 to 5 represents a moderate health risk from unsafe exposure to UV radiation for the ordinary person.Note: An average maximum UV index of 5 in May leads to these recommendations:
Prioritize safety - The need to safeguard skin and eyes from harm is emphasized. The Sun's UV radiation is especially harmful around midday, so reduce exposure and stay safe. Stay sun-safe with clothing that is both closely woven and worn loosely.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
Palo Alto, CA
- Average high temperature in May: 68.2°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 May: 49.6°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 May
Palo Alto, CA
- Average pressure in May: 29.98"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 May
Palo Alto, CA
- Average wind speed in May: 6.5mph
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 May
Palo Alto, CA
- Average humidity in May: 69%
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 May
Palo Alto, CA
- Average rainfall in May: 0.47"
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 May
Palo Alto, CA
- Average rainfall days in May: 4.4 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 May /
Average sunshine in May
Palo Alto, CA
- Average daylight in May: 14h and 12min
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 May: 10h and 54min
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 May
Palo Alto, CA
- Average sunshine days in May: 25.8 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 May
Palo Alto, CA
- Average UV index in May: 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 May
Palo Alto, CA
- Average cloud cover in May: 23
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 May
Palo Alto, CA
- Average visibility in May: 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).
