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SoCal Residents Brace for Early Summer Heatwave
Temperatures expected to soar into the 90s and 100s this week, well before the official start of summer.
Mar. 17, 2026 at 5:41am
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With temperatures in Southern California cities like Ontario and Redlands expected to reach the 90s and even 100 degrees this week, residents are getting an early taste of summer weather. The National Weather Service has warned of dangerously hot conditions arriving Tuesday through Friday, urging people to stay hydrated and take precautions.
Why it matters
Early summer heatwaves can be dangerous, especially for vulnerable populations. The sudden shift in weather can also disrupt daily routines and plans, as people adjust to the warmer temperatures and seek ways to stay cool.
The details
The hot weather is being driven by a high-pressure system that is bringing unseasonably warm temperatures to the region. Ontario is expected to see highs around 99 degrees on Thursday, while Redlands could reach 100 degrees by Friday. The National Weather Service is advising residents to stay hydrated, limit time outdoors, and check on elderly or vulnerable neighbors.
- Temperatures are expected to peak Tuesday through Friday this week.
- Ontario is forecast to reach a high of 99 degrees on Thursday.
- Redlands is expected to hit 100 degrees by Friday.
The players
National Weather Service
The federal agency responsible for weather forecasting and issuing warnings about dangerous weather conditions.
What they’re saying
“Make sure you and everyone around you stays hydrated... even your car!”
— John Doe, Author
What’s next
The National Weather Service will continue to monitor the situation and issue updates as needed.
The takeaway
This early heatwave is a reminder that Southern Californians need to be prepared for the possibility of extreme summer weather, even before the official start of the season. Taking steps to stay cool and hydrated can help mitigate the risks posed by these dangerously hot conditions.
