In this paper, we evaluate agricultural farmers’ economic benefit of weather information service provided by the Central Weather Bureau in Taiwan. Following the standard procedure of the contingent valuation method, we conducted an in-person survey using a representative sample of major farm households randomly drawn by the Bureau of Census. We applied the method of Least Absolute Deviation (LAD) to estimate farmers’ willingness to pay for weather information service. The estimated results show that a farmer is willing to pay 4,134 NTD~4,307 NTD per year for the weather information service and thus the total economic benefits of weather information service is 395.38 million NTD~643.97 million per year. We also evaluate the potential economic benefit that can be realized and find that the benefits of weather information service can reach 577.66 million NTD~941.16 million per year. The results here provide the public sector to improve the educational and extensive strategy in the future and help the private sector to understand the potential market value of weather information services.