May weather forecast
Fresno, CA

May ushers in the comfortable embrace of a warm early-summer atmosphere. The month is characterized by significant upswing in temperatures, complemented by extended sunshine hours. Rainfall plunges to 0.79 in, marking a move towards drier days ahead. The improved conditions lead to a drop in relative humidity, ensuring warm and uncomplicated weather that makes May the gateway to summer. As evidenced, the weather change in May is quite perceptible, transitioning from the pleasant spring climate to the upcoming summer heat.

Temperature

As May arrives, Fresno's weather shows a minor increase in high-temperatures, edging from April's pleasant 72.3°F (22.4°C) to a moderately hot 81°F (27.2°C). May nights present a sharp contrast to daytime highs, with average temperatures of 55.9°F (13.3°C).

Heat index

The heat index for May is computed to be 80.6°F (27°C). Remaining active during long-lasting exposure could cause fatigue, leading to heat cramps.
Observations indicate that the heat index values are for shady locations with light wind. Direct sunlight exposure may cause a 15 Fahrenheit (8 Celsius) degrees rise in the heat index.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', provides an understanding of perceived warmth by combining temperature and relative humidity. An individual's perception of weather can be swayed by a variety of elements including metabolic differences, pregnancy status, and their level of physical exertion. Keep aware, the sun, when shining directly, can intensify the heat experience, pushing the heat index up by 15 Fahrenheit (8 Celsius) degrees. Heat index values are primarily vital for children. Kids are usually in more danger than grown-ups as they tend to sweat less. Plus, their bigger skin surface in relation to their small frames and increased heat generation due to their activity level make them more susceptible.

Humidity

In May, the average relative humidity is 44%.

Rainfall

In Fresno, in May, it is raining for 4.8 days, with typically 0.79" (20mm) of accumulated precipitation. In Fresno, during the entire year, the rain falls for 59.3 days and collects up to 10.43" (265mm) of precipitation.

Daylight

The average length of the day in May is 14h and 9min.
On the first day of May, sunrise is at 6:04 am and sunset at 7:48 pm. On the last day of the month, sunrise is at 5:41 am and sunset at 8:12 pm PDT.

Sunshine

The average sunshine in May is 11.6h.

UV index

The average daily maximum UV index in May is 6. A UV Index value of 6 to 7 symbolizes a high health hazard from unprotected exposure to Sun's UV rays for the average person.
Note: A maximum UV index of 6 in May translates into the following recommendations:
Sidestep overexposure. Individuals with fair complexions risk burning in fewer than 20 minutes. It's important to stay in the shade and limit exposure to the sun from 10 a.m. to 4 p.m., when UV radiation is most intense, although remember that shade structures may not provide full sun protection. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes.