San Bernardino Weather in September
September in San Bernardino sees daytime temperatures around 34°C (93°F) and lows of 17°C (63°F) at night. Rainfall is minimal, so you're unlikely to need an umbrella.
Rainfall in San Bernardino in September
Expect around a single day of rain based on historical data, with 4.8 mm (0.2 in) average. If rain does fall, it tends to be a moderate shower rather than anything heavy.
Temperature in San Bernardino in September
In September, San Bernardino sees very high temperatures, with highs of 34°C (93°F). Nights drop to around 17°C (63°F). Sunshine and humidity can make it feel even warmer than the raw temperature suggests. Nights cool down to 17°C (63°F), so a light jacket or extra layer is useful once the sun goes down. On the plus side, the cooler nights make for comfortable sleeping conditions.
Sunshine in San Bernardino in September
Expect a lot of sunshine this month, with about 290 hours of sun. These sunny conditions add to the overall experience.September in San Bernardino has its charm. However, if you're seeking pleasant, dry and sunny weather, our weather planner can help you explore other destinations in the world.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our San Bernardino's climate page.
San Bernardino Temperature in September
Min Temperature
17°C (63°F)
Max Temperature
34°C (93°F)
Chance of Rain
3%
Precipitation
4.8 mm (0.2 in)
Rainy days
a single day
Sunshine
290 hours *
Percentage Sunshine
*
Best Places in the United States of America in September
Find out more about the weather in the United States of America and which places have the best travel conditions in this month. See all of the United States of America in September →
perfect weather
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What to Wear in San Bernardino in September
Pack for serious heat in San Bernardino in September. Prioritize clothing that breathes and doesn't cling or stick. Lightweight cotton, linen, and moisture-wicking fabrics are ideal. A wide hat provides welcome shade. Dry conditions mean you won't need to worry about rain protection. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.What To Do in San Bernardino in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our San Bernardino's climate page.
See the full San Bernardino climate overview or explore weather in the United States of America.
