Weather Tomorrow in Fontana, CA

Extreme Heat WarningUntil Aug 24, 10:30 PM

Extreme Heat Warning issued August 24 at 1:58AM PDT until August 28 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.

Heat AdvisoryUntil Aug 24, 10:30 PM

Heat Advisory issued August 24 at 1:58AM PDT until August 25 at 10:00AM 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.

Tuesday, August 25, 2026

Clear

Precip chance

Wind

0-15 mph

Humidity

40%

Feels like

101–74°F

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

Tomorrow by Hour

72°Temperature trend103°

Time	Temp	Condition	Rain %	Wind	Humidity

7 AM☽	79°F	Mostly Clear	1%	0 mph	48%
8 AM☽	78°F	Mostly Clear	1%	0 mph	50%
9 AM☽	77°F	Clear	1%	0 mph	53%
10 AM☽	75°F	Clear	1%	0 mph	56%
11 AM☽	74°F	Clear	1%	0 mph	57%
12 PM☽	74°F	Mostly Clear	0%	0 mph	58%
1 PM	72°F	Sunny	0%	0 mph	60%
2 PM	74°F	Sunny	0%	0 mph	59%
3 PM	77°F	Sunny	0%	0 mph	54%
4 PM	82°F	Sunny	0%	0 mph	47%
5 PM	88°F	Sunny	0%	5 mph S	38%
6 PM	92°F	Sunny	2%	5 mph SW	33%
7 PM	96°F	Sunny	2%	5 mph SW	28%
8 PM	100°F	Sunny	2%	10 mph SW	23%
9 PM	102°F	Sunny	2%	10 mph SW	22%
10 PM	102°F	Sunny	2%	10 mph SW	22%
11 PM	103°F	Sunny	2%	15 mph SW	22%
12 AM	102°F	Sunny	1%	10 mph SW	24%
1 AM☽	100°F	Clear	1%	10 mph SW	27%
2 AM☽	95°F	Clear	1%	10 mph SW	31%
3 AM☽	90°F	Clear	1%	5 mph SW	36%
4 AM☽	87°F	Clear	1%	5 mph SW	39%
5 AM☽	85°F	Clear	1%	0 mph	41%
6 AM☽	83°F	Clear	0%	0 mph	43%

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: 103°F

Low: 72°F

Wind: 0-15 mph

Rain: 2%

Big temperature swing (72°F to 103°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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More for Fontana, CA

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Frequently Asked Questions

What is the weather forecast for tomorrow in Fontana, CA?

Tomorrow in Fontana: High of 103°F, Low of 72°F. Clear with 2% chance of precipitation. Wind 0-15 mph.

Will it rain tomorrow in Fontana?

No significant precipitation expected tomorrow.

What should I wear tomorrow in Fontana?

With a high of 103°F and low of 72°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.