May weather forecastHayward, CA
May
Weather in May
May encourages pleasant weather conditions in Hayward. The city experiences consistent climatic conditions with increased high temperatures, decreased humidity, and low rainfall. The extended daylight hours invite more sunshine, and wind speeds gradually decrease. May witnesses a dramatic drop in rainfall in Hayward, with an average of 0.51" (13mm), marking the onset of drought conditions. The brighter and drier May is a precursor to the impending brilliance of sunny Californian summers.Temperature
May's arrival shows an average high-temperature of an agreeable 70.3°F (21.3°C), hardly different from the previous month. Hayward's nighttime temperature during May is consistently averaged at a chilly 49.1°F (9.5°C).Humidity
The average relative humidity in May is 67%.Rainfall
In May, the rain falls for 4.3 days. Throughout May, 0.51" (13mm) of precipitation is accumulated. In Hayward, during the entire year, the rain falls for 69.2 days and collects up to 11.1" (282mm) of precipitation.Daylight
In Hayward, the average length of the day in May is 14h and 13min.On the first day of May, sunrise is at 6:11 am and sunset at 7:59 pm. On the last day of the month, sunrise is at 5:48 am and sunset at 8:23 pm PDT.
Sunshine
In May, the average sunshine is 10.9h.UV index
The average daily maximum UV index in May is 5. A UV Index estimate of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV radiation for the ordinary person.Note: The daily high UV index of 5 during May translates into the following recommendations:
Exercise prevention - Warding off sunburn is urged. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
Hayward, CA
- Average high temperature in May: 70.3°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 May: 49.1°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 May
Hayward, CA
- Average pressure in May: 29.98"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 May
Hayward, CA
- Average wind speed in May: 6.6mph
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 May
Hayward, CA
- Average humidity in May: 67%
The month with the highest relative humidity is March (74%).
The month with the lowest relative humidity is September (61%).
Average rainfall in May
Hayward, CA
- Average rainfall in May: 0.51"
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 May
Hayward, CA
- Average rainfall days in May: 4.3 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 May /
Average sunshine in May
Hayward, 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
Hayward, CA
- Average sunshine days in May: 26 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 May
Hayward, CA
- Average UV index in May: 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 May
Hayward, CA
- Average cloud cover in May: 22
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 May
Hayward, 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).
