Weather Tomorrow in San Bernardino, CA

Extreme Heat WarningUntil Sep 9, 5:30 AM

Extreme Heat Warning issued September 8 at 1:52PM PDT until September 9 at 8:00PM PDT by NWS San Diego CA

Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Do not leave young children and pets in unattended vehicles. Car interiors will reach lethal temperatures in a matter of minutes.

Heat AdvisoryUntil Sep 9, 5:30 AM

Heat Advisory issued September 8 at 1:52PM PDT until September 10 at 8:00PM PDT by NWS San Diego CA

Wednesday, September 9, 2026

Clear

Precip chance

Wind

0-10 mph

Humidity

52%

Feels like

100–78°F

Data source: National Weather Service (NOAA) · Updated just now

Tomorrow by Hour

76°Temperature trend102°

Time	Temp	Condition	Rain %	Wind	Humidity

7 AM☽	82°F	Partly Cloudy	3%	0 mph	62%
8 AM☽	81°F	Partly Cloudy	3%	0 mph	63%
9 AM☽	79°F	Mostly Clear	3%	0 mph	66%
10 AM☽	78°F	Mostly Clear	3%	0 mph	68%
11 AM☽	78°F	Mostly Clear	3%	0 mph	68%
12 PM☽	77°F	Mostly Clear	1%	0 mph	69%
1 PM	76°F	Sunny	1%	0 mph	69%
2 PM	76°F	Sunny	1%	0 mph	71%
3 PM	78°F	Sunny	1%	0 mph	70%
4 PM	84°F	Sunny	1%	0 mph	58%
5 PM	89°F	Sunny	1%	0 mph	50%
6 PM	94°F	Sunny	8%	0 mph	41%
7 PM	98°F	Sunny	8%	0 mph	34%
8 PM	100°F	Sunny	8%	5 mph SW	31%
9 PM	101°F	Sunny	8%	0 mph	30%
10 PM	102°F	Sunny	8%	5 mph W	30%
11 PM	101°F	Sunny	8%	5 mph W	32%
12 AM	100°F	Sunny	8%	10 mph W	36%
1 AM☽	98°F	Mostly Clear	8%	5 mph W	39%
2 AM☽	94°F	Mostly Clear	8%	5 mph SW	46%
3 AM☽	91°F	Mostly Clear	8%	5 mph S	49%
4 AM☽	89°F	Mostly Clear	8%	5 mph SW	52%
5 AM☽	87°F	Mostly Clear	8%	0 mph	56%
6 AM☽	86°F	Partly Cloudy	0%	0 mph	58%

Precipitation Timeline

No significant precipitation expected tomorrow.

What to Wear Tomorrow

Extreme heat — stay cool and protected

Clothing

• Lightest possible clothing
• Wide-brim hat
• UV-protective shirt if outdoors

Footwear

Breathable sandals

Accessories

• Sunglasses
• Sunscreen

Conditions

High: 102°F

Low: 76°F

Wind: 0-10 mph

Rain: 8%

Big temperature swing (76°F to 102°F) — dress in removable layers.

Best Time to Be Outside Tomorrow

1 PM – 2 PM

Excellent conditions for outdoor activities (dry, comfortable temp, light wind, daylight)

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Frequently Asked Questions

What is the weather forecast for tomorrow in San Bernardino, CA?

Tomorrow in San Bernardino: High of 102°F, Low of 76°F. Clear with 8% chance of precipitation. Wind 0-10 mph.

Will it rain tomorrow in San Bernardino?

No significant precipitation expected tomorrow.

What should I wear tomorrow in San Bernardino?

With a high of 102°F and low of 76°F, check our "What to Wear" section above for specific clothing recommendations based on temperature, wind, and precipitation.

How accurate is this forecast?

Our forecasts come directly from the National Weather Service (NOAA), which provides some of the most accurate weather predictions available. Tomorrow forecasts are generally 80-90% accurate, with accuracy decreasing the further out you look. Data is refreshed every 30 minutes.