Rijau is a Local Government Area in Niger State, Nigeria. Its headquarters are in the town of Rijau.

It has an area of 3,196 km and a population of 176,053 at the 2006 census.

The postal code of the area is 923.

Throughout the wet season, the temperature rarely falls below 54°F or rises above 105°F, with a year-round range of 59°F to 100°F.

A daily maximum temperature of 97°F is typical during the 2.3-month hot season, which runs from February 16 to April 25. April has an average high temperature of 99°F and low temperature of 76°F, making it the hottest month of the year in Rijau.

A daily maximum temperature below 87°F is typical during the 3.3-month cool season, which runs from July 2 to October 10. December, with an average low of 60°F and high of 90°F, is the coldest month of the year in Rijau.

The average proportion of sky that is covered by clouds in Rijau varies significantly seasonally throughout the year.

Beginning about November 4 and lasting for four months, the clearer season in Rijau ends around March 5.

In Rijau, January is the clearest month of the year, with the sky remaining clear, mostly clear, or partly overcast 61% of the time.

Beginning around March 5 and lasting for 8.0 months, the cloudier period of the year ends around November 4.

May is the cloudiest month of the year in Rijau, with the sky being overcast or mostly cloudy 77% of the time on average.