<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2015-10-19</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000105418</issuerCik>
        <issuerName>WEIS MARKETS INC</issuerName>
        <issuerTradingSymbol>WMK</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0000920914</rptOwnerCik>
            <rptOwnerName>WASSERMAN ELLEN W P</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O WEIS MARKETS, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>1000 SOUTH SECOND STREET, PO BOX 471</rptOwnerStreet2>
            <rptOwnerCity>SUNBURY</rptOwnerCity>
            <rptOwnerState>PA</rptOwnerState>
            <rptOwnerZipCode>17801</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>1</isOther>
            <otherText>Member of a 10% owner group</otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2015-10-19</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>J</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>3324543.5</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                    <footnoteId id="F2"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>3324543.5</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By Family Trust</value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2015-10-26</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>5</transactionFormType>
                <transactionCode>G</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value>E</value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>1746424</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                    <footnoteId id="F2"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">The reporting person became trustee of a family trust established under the will of Harry Weis.  The reporting person and members of her immediate family are among the beneficiaries of the trust.  The reporting person disclaims beneficial ownership of the Common Stock held by the trust except to the extent of her pecuniary interest therein.  This item is being reported as a change in ownership but did not involve the purchase or sale of any shares.</footnote>
        <footnote id="F2">Not applicable</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>Ellen W.P. Wasserman</signatureName>
        <signatureDate>2016-02-09</signatureDate>
    </ownerSignature>
</ownershipDocument>
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X0306
4
2015-10-19
0
0000105418
WEIS MARKETS INC
WMK
0000920914
WASSERMAN ELLEN W P
C/O WEIS MARKETS, INC.
1000 SOUTH SECOND STREET, PO BOX 471
SUNBURY
PA
17801
0
0
0
1
Member of a 10% owner group
Common Stock
2015-10-19
4
J
0
3324543.5
0
A
3324543.5
I
By Family Trust
Common Stock
2015-10-26
5
G
0
E
1746424
0
D
0
D
The reporting person became trustee of a family trust established under the will of Harry Weis.  The reporting person and members of her immediate family are among the beneficiaries of the trust.  The reporting person disclaims beneficial ownership of the Common Stock held by the trust except to the extent of her pecuniary interest therein.  This item is being reported as a change in ownership but did not involve the purchase or sale of any shares.
Not applicable
Ellen W.P. Wasserman
2016-02-09