National City (CA) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit National City.
Climate overview of National City
The climate in National City, California, United States of America, sees a moderate range of temperatures across the year, from 27°C (81°F) in September down to 19°C (66°F) in December.
The city has an arid climate, receiving only 227 mm (8.9 in) of rainfall per year. The most sunshine falls in July, with an average of 10.1 hours of daily sunshine.
National City Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in National City - and find the best time to visit.
Monthly Temperature in National City
The weather in National City changes moderately throughout the year, offering enough variation to appreciate each season. On average, daytime temperatures range from a comfortable 27°C (81°F) in September to a pleasant 19°C (66°F) in December.
Nighttime temperatures range from 19°C (66°F) in September to 9°C (48°F) in December.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in National City
National City sits in an arid zone with minimal moisture, averaging 227 mm (8.9 in) of rainfall per year. The seasons in National City bring significant changes in precipitation. The wettest month, December, receives moderate rainfall, with an average of 62 mm (2.4 in) of precipitation. This rainfall is distributed across 7 rainy days.
In contrast, the driest month, June, 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 National City 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 National City
National City enjoys sunny spells year-round. July sees up to 10.1 hours of daily sunshine, perfect for a sunny trip. February, the least sunny month, still offers a generous 7.7 hours of sun despite this cloudier time of the year.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Daily hours of sunshine
Daily percentage of sunshine
Humidity in National City by Month
The relative humidity is high throughout the year in National City.
The city experiences its highest humidity in July, reaching 75%. In January, the humidity drops to its lowest level at 64%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
Best Time to Visit National City
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, July, August, September, October and November
- Warmest weather: July, August, September and October
- Most sunshine: July and August
- Fewer rainy days: May, June, July, August and September
- Seasonal pattern: Very little rainfall for most of the year
Frequently asked questions about the climate in National City
What is the best time to visit National City?
January, February, March, April, May, June, July, August, September, October and November typically offer the most optimal weather in National City. In contrast, December tends to have less optimal conditions. National City has very little rainfall for most of the year.
What temperatures can I expect in National City?
Daytime highs range from 19°C (66°F) in December to 27°C (81°F) in September. Nighttime lows range from 9°C (48°F) to 19°C (66°F).
How much rain does National City get?
Annual rainfall is around 227 mm (8.9 in). December is the wettest month with 62 mm (2.4 in), while June is the driest with 0.2 mm (0.01 in).
How sunny is National City?
National City receives around 3,069 hours of sunshine per year. July is the sunniest month with 304 hours, while February is the cloudiest with just 230 hours. Overall, National City enjoys abundant sunshine.
National City 3-Day Forecast
National City on the map
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