Overview: Fresno, CA Fresno, CA (United States of America) is a place with a hot continental climate. Temperatures during the day are in the range from 13 °C (55 °F) in December to 37 °C (99 °F) in July. The least rainy month in Fresno, CA is July with its 0 days of rain, the rainiest month is March, when it rains 7 days. The highest night temperatures could be experienced in July with 19 °C (66 °F), the lowest in December with 3 °C (38 °F).