Company: RAIN
Filing Date: 2025-05-16
Form Type: 424B3
Source: 0001213900-25-044498
Chunk: 0

Company: Rain Enhancement Technologies Holdco, Inc.
Filing Date: 2025-05-16
Form: 424B3
Chunk 0
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Filed Pursuant to Rule 424(b)(3)

Registration No. 333-284614

PROSPECTUS SUPPLEMENT No. 1

(to the prospectus dated April 25, 2025)

<div align='center'>Rain Enhancement Technologies Holdco, Inc.

5,000,000 Shares of Class A Common Stock Underlying Warrants (For Issuance)

5,914,057 Shares of Class A Common Stock (For Resale)</div>

This prospectus supplement No. 1 (this “Supplement”)
supplements, updates and amends the information contained in the prospectus dated April 25, 2025 (the “Prospectus”) relating
to the issuance of shares of Class A common stock, par value $0.0001 per share (the “Class A Common Stock”), of Rain Enhancement
Technologies Holdco, Inc. (the “Company”) upon the exercise of warrants of the Company (“Warrants”) and the resale
from time to time of shares of Class A Common Stock by the selling shareholders (including their transferees, donees, pledgees and other
successors-in-interest) named in the Prospectus. This Supplement updates and supplements the Prospectus.

This Supplement is being filed to update and supplement
the information previously included in the Prospectus with the information contained in the Company’s Quarterly Report on Form 10-Q
filed with the SEC on May 15, 2025 (the “Form 10-Q”). Accordingly, we have attached the Form 10-Q to this Supplement. You
should read this Supplement in conjunction with the Prospectus. This Supplement is not complete without, and may not be delivered or used
except in conjunction with, the Prospectus, including any amendments or supplements thereto. This Supplement is qualified by reference
to the Prospectus, except to the extent that the information provided by this Supplement supersedes information contained in the Prospectus.
Capitalized terms used in this Supplement have the meanings given to them in the Prospectus.

Our shares of Class A Common Stock and Warrants
are listed on the Nasdaq Stock Market LLC (“Nasdaq”) under the symbols “RAIN” and “RAINW,” respectively.
On May 13, 2025, the closing price of our Class A Common Stock was $5.98 per share and the closing price for our Warrants was $0.15 per
Warrant.

We are an “emerging growth company” as defined under the federal