Dangerous heat wave to hit Northern California: Check live temperatures and heat risk maps through June 1
Northern California is bracing for a multi-day extreme heat event, with major health risks expected in the Sacramento Valley and surrounding areas. Affected residents are urged to stay hydrated, limit outdoor activity, and monitor updates as conditions evolve.
The National Weather Service (NWS) in Sacramento has issued a Dangerous Heat Alert for much of Northern California, with triple-digit temperatures forecast from Friday, May 30 through Sunday, June 1.
Affected cities include Sacramento, Redding, Chico, Stockton, Modesto, Fairfield, and surrounding areas, in which you can check current temperatures with the tool below.
Heat Timing and Temperature Forecast
An Extreme Heat Watch is in effect from 11 AM Friday to 8 PM Sunday for the Valley, Delta, foothills, and northern Coastal Range. Highs will range from 99°-109°. Be sure to have a way to stay cool and hydrated! #cawx pic.twitter.com/eHRyjzHfkh
— NWS Sacramento (@NWSSacramento) May 26, 2025
The period of greatest concern spans 11 AM Friday to 11 PM Saturday, May 30–31, when high temperatures in the Valley, Delta, Foothills, and Northern Coastal Range are expected to reach 99°F to 109°F, with overnight lows only dropping into the mid-60s to mid-70s.
Major HeatRisk Across the Region
According to the NWS HeatRisk map for Friday, May 30, much of the Sacramento Valley—including Redding, Chico, Yuba City, and Sacramento—will experience Major HeatRisk conditions, meaning the weather will be dangerous for anyone without proper cooling or hydration.
Key recommendations include:
- Canceling outdoor activities during peak heat hours.
- Remaining in cool, shaded, or air-conditioned spaces.
- Drinking water frequently and avoiding alcohol or caffeine.
Probability of 100°F+ Temperatures by Location
Impacts and Safety Recommendations
The NWS warns that the heat wave poses a high risk of heat stress and heat-related illnesses, particularly for vulnerable populations such as the elderly, children, outdoor workers, and pets.
What to Do:
- Stay hydrated – drink water frequently, even if you don’t feel thirsty.
- Avoid direct sun – especially between 10 AM and 6 PM.
- Use air conditioning if available—fans alone may not provide sufficient cooling.
- Check on at-risk neighbors and family members.
- Know the signs of heat illness, including dizziness, headache, nausea, and confusion.
Stay Updated
This alert will remain in effect through Sunday afternoon, June 1, and may be extended if conditions persist or worsen. Residents are advised to continue monitoring the NWS for the latest updates.
