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 begins, there's a slight increase in the average high-temperature, moving from an agreeable 72.3°F (22.4°C) in April to a warm 81°F (27.2°C). A pronounced dip becomes evident during the nights in May as Fresno logs a consistent average temperature of 55.9°F (13.3°C).

Heat index

In May, the average heat index is appraised at 80.6°F (27°C). If one sustains activity during exposure, it could lead to a sense of fatigue, with a chance of heat cramps.
Remember that heat index calculations are made for conditions in the shade with light wind. Exposing to direct sunshine may enhance heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'real feel', stands as a testimony to how temperature and humidity combine to impact our sense of warmth. 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. In direct sunlight, the heat's impact can be heightened, potentially leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold great significance to children. Young ones often ignore the need to take a break and drink fluids. Thirst is a late-stage symptom of dehydration - hence, maintaining hydration, particularly during extended physical activities, is crucial.

Humidity

In Fresno, California, the average relative humidity in May is 44%.

Rainfall

In Fresno, in May, it is raining for 4.8 days, with typically 0.79" (20mm) of accumulated precipitation. Throughout the year, in Fresno, there are 59.3 rainfall days, and 10.43" (265mm) of precipitation is accumulated.

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

In Fresno, the average daily maximum UV index in May is 6. A UV Index of 6 to 7 symbolizes a high health risk from exposure to the Sun's UV rays for average individuals.
Note: The UV index of 6 during May translates into the following guidance:
Dodge overexposure. Fair-skinned people can get singed in less than 20 minutes. Stay in the shade and avoid direct Sun exposure from 10 a.m. to 4 p.m., a period when UV radiation is particularly strong, noting that parasols or canopies may not offer total sun protection. Arm yourself against UV rays' harm with protective apparel and UV-filtering shades.