San Bernardino Weather in September
Thinking of visiting San Bernardino in September? Expect moderate temperatures reaching 14°C (57°F) during the day, dropping to 4°C (39°F) at night, and note that quite a bit of rainfall is likely.
Rainfall in San Bernardino in September
Historically, September sees about 15 days of rain, with a monthly average of 146 mm (5.7 in). Rainfall intensity is on the higher side this month. Expect more substantial showers rather than light, passing rain.
Temperature in San Bernardino in September
Expect highs of 14°C (57°F) in San Bernardino in September, with nights dropping to around 4°C (39°F). A light jacket or extra layer can be useful, especially outside the warmest hours of the day. At 4°C (39°F) overnight, it gets properly cold after dark. On the bright side, cold nights tend to make for excellent sleeping conditions.
Sunshine in San Bernardino in September
The month experiences a moderate amount of sunlight, with 156 hours of sunshine. This provides a nice balance between sunshine and clouds.For San Bernardino itself, July and August generally stand out with the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Switzerland, check out our San Bernardino's climate page.
San Bernardino Temperature in September
Min Temperature
4°C (39°F)
Max Temperature
14°C (57°F)
Chance of Rain
50%
Precipitation
146 mm (5.7 in)
Rainy days
15 days
Humidity
75% *
Sunshine
156 hours *
Percentage Sunshine
50% *
Best Places in Switzerland in September
Find out more about the weather in Switzerland and which places have the best travel conditions in this month. See all of Switzerland in September →
perfect weather
pleasant
tolerable
unpleasant
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What to Wear in San Bernardino in September
The weather can swing between comfortable and chilly in September, so flexibility is key. Pack a variety of tops, at least one warm layer, and both shorts and long pants. This gives you options no matter what the day brings. Expect heavy rainfall, so bring good rain protection and waterproof bags. It won't hurt to bring your sunglasses along, as you'll see some sunny periods.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 Switzerland, check out our San Bernardino's climate page.
Temperature Rainfall Sunshine Humidity
See the full San Bernardino climate overview or explore weather in Switzerland.
