Weguelin was the son of William A Weguelin of Weymouth Street, Portland Place, London, who was a Russia merchant in London. He had directorships of the London and Liverpool and Globe Assurance Co., the Bahia and San Francisco Railway Co., and the Trust and Loan Co. of Upper Canada. From 1853 to 1855 he was Deputy Governor of the Bank of England and from 1855 to 1857 the Governor. He was a J.P. for Surrey.
Weguelin was elected as Member of Parliament (MP) for Southampton at a by-election in February 1857. He was re-elected at the general election in April 1857, but was defeated at the 1859 general election. He was returned to the Commons after a two-year absence at a by-election in July 1861 for Wolverhampton, and held that seat until he retired from Parliament at the 1880 general election.
Weguelin died at the age of 75.
Weguelin married firstly in 1837 Charlotte Poulett-Thomson, daughter of A. H. Poulett-Thomson. She died in 1840 and he married secondly in 1844, Catherine Hammersley, daughter of Charles Hammersley.
- Leigh Rayment's Historical List of MPs – Constituencies beginning with "S" (part 3)
- Leigh Rayment's Historical List of MPs – Constituencies beginning with "W" (part 5)
- Debretts House of Commons and the Judicial Bench 1870
- "No. 21967". The London Gazette. 13 February 1857. p. 499.
- "No. 21987". The London Gazette. 10 April 1857. p. 1298.
- Craig, F. W. S. (1989) . British parliamentary election results 1832–1885 (2nd ed.). Chichester: Parliamentary Research Services. p. 280. ISBN 0-900178-26-4.
- "No. 22527". The London Gazette. 5 July 1861. p. 2789.
- Craig, pages 338–9
- Hansard 1803–2005: contributions in Parliament by Thomas Weguelin
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