Zhanjiang has a humid subtropical climate. The monthly daily average temperature in January is 15.9 °C (60.6 °F), and in July is 29.0 °C (84.2 °F). From April to September, rainfall is the heaviest and most frequent. Influenced by the ocean climate, Zhanjiang escapes the heat of the summer and chilliness of the winter.
The city is served by the Zhanjiang Airport (IATA: ZHA, ICAO: ZGZJ).
The Litang-Zhanjiang Railway runs from Zhanjiang inland to Guangxi. A branch line off the Litang-Zhanjiang Line at Hechun to Maoming connects Zhanjiang with Guangdong's rail network to the east. A direct rail connection between Zhanjiang and Maoming, which will form the southernmost section of the Luoyang-Zhanjiang Railway, is under construction. The Guangdong-Hainan Railway runs south from Zhanjiang down the Leizhou Peninsula to Hai'an where trains are ferried to Hainan Island's rail network.