International Development Secretary Justine Greening said just under half the aid will help Jordan cope with the increasing influx of people. The remaining aid will go to humanitarian agencies inside Syria to restock medical facilities and treat the sick and injured, as well as buy basic food supplies.
Some 6,400 Syrians arrived at the main refugee camp in Jordan in the last 24 hours, the United Nations said, which described the flow as "absolutely dramatic."
Greening called for additional support from the international community, saying the "vast majority are still not doing enough."
The two-year conflict in Syria has left 2 million people internally displaced and 60,000 dead.