Monrovia (CA) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Monrovia.
Climate overview of Monrovia
Temperatures in Monrovia, 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 has a relatively dry climate, receiving around 417 mm (16 in) of rainfall per year. It does experience a distinct dry season from April to November, with very warm summers and pleasant winters. December is the wettest month and August the driest. July is the sunniest month, averaging 12.1 hours of sunshine per day.
Monrovia Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Monrovia - and find the best time to visit.
Monthly Temperature in Monrovia
The climate in Monrovia is known for significant temperature differences throughout the year, making the weather dynamic. On average, daytime temperatures range from a very warm 34°C (93°F) in August to a pleasant 19°C (66°F) in December.
Nighttime temperatures range from 18°C (64°F) in August to 8°C (46°F) in December.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Monrovia
Monrovia has a relatively dry climate with low precipitation, averaging 417 mm (16 in) of rainfall annually. The seasons in Monrovia bring significant changes in precipitation. The wettest month, December, receives moderate rainfall, with an average of 98 mm (3.9 in) of precipitation. This rainfall is distributed across 9 rainy days.
In contrast, the driest month, August, experiences much less rainfall, totaling 0.4 mm (0.02 in) over 0 rainy days. These distinct seasonal differences provide diverse experiences throughout the year. For more details, please visit our Monrovia 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 Monrovia
In Monrovia, summer days are longer and more sunny, with daily sunshine hours peaking at 12.1 hours in July. As the darker season arrives, the brightness of the sun becomes less. November sees a soft sun for only 7.2 hours per average day.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Daily hours of sunshine
Daily percentage of sunshine
Humidity in Monrovia by Month
The relative humidity is high throughout the year in Monrovia.
The city experiences its highest humidity in May, reaching 73%. In November, the humidity drops to its lowest level at 50%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
Best Time to Visit Monrovia
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, June, October and November
- Warmest weather: July, August and September
- Most sunshine: July and August
- Fewest rainy days: June, July, August and September
- Seasonal pattern: A distinct dry season from April to November, with very warm summers and pleasant winters
Frequently asked questions about the climate in Monrovia
What is the best time to visit Monrovia?
January, February, March, April, May, June, October and November typically offer the most optimal weather in Monrovia. In contrast, August tends to have less optimal conditions. Monrovia has a distinct dry season from April to November, with very warm summers and pleasant winters.
What temperatures can I expect in Monrovia?
Daytime highs range from 19°C (66°F) in December to 34°C (93°F) in August. Nighttime lows range from 8°C (46°F) to 18°C (64°F). Temperatures vary considerably through the year.
How much rain does Monrovia get?
Annual rainfall is around 417 mm (16 in). December is the wettest month with 98 mm (3.9 in), while August is the driest with 0.4 mm (0.02 in).
How sunny is Monrovia?
Monrovia receives around 3,257 hours of sunshine per year. July is the sunniest month with 364 hours, while November is the cloudiest with just 217 hours. Overall, Monrovia enjoys abundant sunshine.
Monrovia 3-Day Forecast
Monrovia (CA) 3-Day Forecast
Monrovia on the map
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