Yosemite National Park is definitely worth a visit
Vast forests, blue lakes, towering sequoias, and majestic waterfalls hint at the beauty of Yosemite National Park—a true natural masterpiece.
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.
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
*
* Data from: Corona, the United States of America (36 KM, 22 Miles).
San Bernardino Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in San Bernardino - and find the best time to visit.
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
pleasant
tolerable
unpleasant
poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
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.
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Swimming10/10 -
Cycling8/10 -
Walking8/10 -
Barbeque10/10 -
Camping10/10 -
Outdoor sports8/10
San Bernardino 3-Day Forecast
More climate data for San Bernardino
See the full San Bernardino climate overview or explore weather in the United States of America.
Popular in September
Where to go in September - average daytime high across popular destinations.
Bucket list
Need travel inspiration? Check out our bucket list articles and be inspired.
Yosemite National Park is definitely worth a visit
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