The dollar is up strongly. Currency rates September 17, 2026

Data provided by the National Bank of Poland (NBP) on Thursday shows that on September 17, 1 US dollar cost PLN 3.8030. For the most popular European currency, i.e. euro, PLN 4.3632. For 1 Swiss franc you had to pay PLN 4.6076, and for 1 British pound you had to pay PLN 5.0942.

What exchange rates on September 17? The dollar is up strongly

Currency rates – Thursday, September 17

• dollar – PLN 3.8030

• euro – PLN 4.3632

• Swiss franc – PLN 4.6076

• pound sterling – PLN 5.0942

Currency rates – last 7 days

Currency rates – Wednesday, September 16

• dollar – PLN 3.7639

• euro – PLN 4.3435

• Swiss franc – PLN 4.5968

• pound sterling – PLN 5.0703

Currency rates – Tuesday, September 15

• dollar – PLN 3.7667

• euro – PLN 4.3445

• Swiss franc – PLN 4.6069

• pound sterling – PLN 5.0756

Currency rates – Monday, September 14

• dollar – PLN 3.7607

• euro – PLN 4.3391

• Swiss franc – PLN 4.5926

• pound sterling – PLN 5.0705

Currency rates – Friday, September 11

• dollar – PLN 3.7267

• euro – PLN 4.3228

• Swiss franc – PLN 4.5768

• pound sterling – PLN 5.0332

Currency rates – Thursday, September 10

• dollar – PLN 3.7103

• euro – PLN 4.3180

• Swiss franc – PLN 4.5792

• pound sterling – PLN 5.0300

Why do currency rates change daily?

Currency rates change every day due to dynamic processes taking place in the financial market. The most important factors influencing their fluctuations are: supply and demand for a given currency, decisions of central banks regarding interest rates, macroeconomic data such as inflation or GDP, as well as geopolitical events and global crises.

Investor speculation on the Forex market can also lead to sudden changes in rates. For example, an increase in demand for the US dollar may increase its value relative to other currencies. Seasonal factors, such as holidays or the end of the year, may also influence exchange rate fluctuations.