Arroyo Grande (CA) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Arroyo Grande.
Climate overview of Arroyo Grande
The climate in Arroyo Grande, California, United States of America, is remarkably consistent, with temperatures year-round averaging 21°C (70°F). The warmest month is September at 23°C (73°F), and the coolest is December at 18°C (64°F).
The city has a relatively dry climate, receiving around 317 mm (12 in) of rainfall per year. It does experience a distinct dry season from April to November. December is the wettest month and August the driest. The most sunshine falls in July, with an average of 11.7 hours of daily sunshine.
Arroyo Grande Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Arroyo Grande — and find the best time to visit.
Monthly Temperature in Arroyo Grande
In Arroyo Grande temperatures are generally consistent throughout the year. On average, daytime temperatures range from a comfortable 23°C (73°F) in September to a moderate 18°C (64°F) in December.
Nighttime temperatures range from 13°C (55°F) in September to 6°C (43°F) in December.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Arroyo Grande
Arroyo Grande's climate is marked by below-average rainfall, accumulating 317 mm (12 in) of precipitation yearly. The seasons in Arroyo Grande bring significant changes in precipitation. The wettest month, December, receives moderate rainfall, with an average of 74 mm (2.9 in) of precipitation. This rainfall is distributed across 9 rainy days.
In contrast, the driest month, August, experiences much less rainfall, totaling 0.2 mm (0.01 in) over 0 rainy days. These distinct seasonal differences provide diverse experiences throughout the year. For more details, please visit our Arroyo Grande Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Sunshine Hours in Arroyo Grande
In Arroyo Grande, summer days are longer and more sunny, with daily sunshine hours peaking at 11.7 hours in July. As the darker season arrives, the brightness of the sun becomes less. January sees a soft sun for only 6.9 hours per average day.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Daily hours of sunshine
Best Time to Visit Arroyo Grande
Frequently asked questions about the climate in Arroyo Grande
What is the best time to visit Arroyo Grande?
March, April, May, June, July, August, September, October and November typically offer the most optimal weather in Arroyo Grande. In contrast, January, February and December tend to have less optimal conditions. Arroyo Grande has a distinct dry season from April to November.
What temperatures can I expect in Arroyo Grande?
Daytime highs range from 18°C (64°F) in December to 23°C (73°F) in September. Nighttime lows range from 6°C (43°F) to 13°C (55°F). Temperatures stay relatively stable year-round.
How much rain does Arroyo Grande get?
Annual rainfall is around 317 mm (12 in). December is the wettest month with 74 mm (2.9 in), while August is the driest with 0.2 mm (0.01 in).
How sunny is Arroyo Grande?
Arroyo Grande receives around 3,187 hours of sunshine per year. July is the sunniest month with 352 hours, while January is the cloudiest with just 208 hours. Overall, Arroyo Grande enjoys abundant sunshine.
Arroyo Grande 3-Day Forecast
Arroyo Grande (CA) 3-Day Forecast
Arroyo Grande on the map
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