My Costa Mesa Portal

Welcome to the non-official My Costa Mesa Portal.

View public safety alerts, emergency alerts, weather warnings and resources. Find government and nonprofit resources, and related private sector services. See detailed weather forecasts. Ask questions, provide feedback and collaborate. Get news and information.

Browse by category or Search for public safety alerts, resources and information like “public safety alerts, evac warning, missing person, change address, start and run a business, find benefits, do business with government and more."

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Latest News

TrumpRx.gov Adds Generic Drugs and Key Partnerships to Lower Prices

Hantavirus in the US: 2026 Outbreaks, Trends, and How to Stay Safe

DOJ Reclassifies Medical Marijuana to Schedule III in Landmark 2026 Order

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Operation Epic Fury: US Navy 100% Success Rate | Gen. Caine Blockade Update

Atmospheric River AR Level 2 Forecast for California Coast | April 15, 2026

more news

View Public Safety Alerts and Weather Warnings at: https://govonestop.com/active-alerts

Detailed Forecast

This Afternoon
Sunny, with a high near 75. Southwest wind around 10 mph.

Tonight
Mostly cloudy, with a low around 60. South wind around 5 mph.

Thursday
Mostly sunny, with a high near 76. South wind 0 to 10 mph.

Thursday Night
Mostly cloudy, with a low around 61. South wind 0 to 5 mph.

Friday
Mostly sunny, with a high near 75. South wind 0 to 10 mph.

Friday Night
Mostly cloudy, with a low around 60.

Saturday
Mostly cloudy, with a high near 74.

Saturday Night
Mostly cloudy, with a low around 60.

Sunday
Mostly sunny, with a high near 74.

Sunday Night
Partly cloudy, with a low around 59.

Monday
Mostly sunny, with a high near 74.

Monday Night
Partly cloudy, with a low around 59.

Tuesday
Mostly sunny, with a high near 75.

Tuesday Night
Partly cloudy, with a low around 61.

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