According to the company's System Status page there are four ongoing issues which began around 2:00pm.
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Find My - Issue
Today, 2:00 PM - ongoing
Some users are affected
Users may be unable to use this service.
iCloud Account & Sign In - Issue
Today, 2:00 PM - ongoing
Some users are affected
This service may be slow or unavailable.
iCloud Contacts - Issue
Today, 2:00 PM - ongoing
Some users are affected
Users may be experiencing a problem with this service.
iCloud Mail - Issue
Today, 2:00 PM - ongoing
Some users are affected
This service may be slow or unavailable.
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You can check the current status of these issues at the link below.
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