Pomona (CA) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Pomona.
Climate overview of Pomona
Temperatures in Pomona, California, United States of America, vary greatly throughout the year. August is the hottest month at 34°C (93°F), while December is the coldest at 19°C (66°F).
The city tends toward dry conditions, with around 289 mm (11 in) of rainfall per year. It does, however, have a distinct dry season from March to November, with very warm summers and pleasant winters. July is the sunniest month, averaging 12.3 hours of sunshine per day.
Pomona Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Pomona - and find the best time to visit.
Monthly Temperature in Pomona
The climate in Pomona is known for significant temperature differences throughout the year, making the weather dynamic. Typically, average maximum daytime temperatures range from a very warm 34°C (93°F) in August to a pleasant 19°C (66°F) in the coolest month, December.
Nights vary from 17°C (63°F) in August to around 6°C (43°F) during the colder months.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Pomona
Pomona has a relatively dry climate with low precipitation, averaging 289 mm (11 in) of rainfall annually. The climate in Pomona shows significant variation throughout the year. Expect moderate rainfall in December, the wettest month, with an average of 77 mm (3 in) of precipitation over 9 rainy days.
In contrast, the driest month June offers drier and sunnier days, with around 0.2 mm (0.01 in) of rainfall over 0 rainy days. For more details, please visit our Pomona 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 Pomona
For those who appreciate different seasons, Pomona serves as an ideal destination. Expect longer, more sun-filled days in July with an average of 12.3 hours of sunshine daily, and embrace the darker days in January, offering only 6.6 hours of daily sunlight.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Daily hours of sunshine
Best Time to Visit Pomona
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: January, February, March, April, May, October and November
- Warmest weather: July, August and September
- Most sunshine: July and August
- Fewer rainy days: May, June, July, August and September
- Seasonal pattern: A distinct dry season from March to November, with very warm summers and pleasant winters
Frequently asked questions about the climate in Pomona
What is the best time to visit Pomona?
January, February, March, April, May, October and November typically offer the most optimal weather in Pomona. In contrast, August tends to have less optimal conditions. Pomona has a distinct dry season from March to November, with very warm summers and pleasant winters.
What temperatures can I expect in Pomona?
Daytime highs range from 19°C (66°F) in December to 34°C (93°F) in August. Nighttime lows range from 6°C (43°F) to 17°C (63°F). Temperatures vary considerably through the year.
How much rain does Pomona get?
Annual rainfall is around 289 mm (11 in). December is the wettest month with 77 mm (3 in), while June is the driest with 0.2 mm (0.01 in).
How sunny is Pomona?
Pomona receives around 3,279 hours of sunshine per year. July is the sunniest month with 369 hours, while January is the cloudiest with just 198 hours. Overall, Pomona enjoys abundant sunshine.
Pomona 3-Day Forecast
Pomona on the map
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