The 22023 BMW Championship is experiencing unfortunate inclement weather conditions ahead of the first rounds of play at the Olympia Fields North Course in the suburbs of Chicago.The first tee time for the event was initially scheduled for 8:26 a.m. CT (or 9:26 a.m. ET). But PGA TOUR Communications shared an update on Twitter that it would be delayed for an hour due to poor weather conditions.However, in a new update, PGA TOUR Communications shared that the first round is delayed for another hour and will now start at 10:26 a.m. CT (or 11:26 a.m. ET).The tweet read:"The first round is delayed an additional hour. The first tee time is now scheduled for 10:26 a.m. CT."As per the PGA Tour, Olympia Fields is currently experiencing rain showers and mild thunderstorms, causing the delay.However, the course will later experience mixed weather with both sun and clouds on Thursday. Golfers can expect mostly clear, sunny weather over the course of the next three days.The field for the 2023 BMW Championship includes the top 50 players in the FedEx Cup rankings. Jon Rahm is currently at the top with 3,386 points and is followed by World No. 1 Scottie Scheffler with 3,238 points.Lucas Glover, who is currently placed fourth on the rankings, made a huge 45-place jump after winning the FedEx St. Jude Championship 2023. He will tee off at 1:10 a.m. ET and is paired with third-ranked Rory McIlroy.What is the updated tee time for the 2023 BMW Championship?Below are the updated tee times and pairings for the second FedEx Cup playoff event at Olympia Fields North Course (all times in ET):11:26 AM - Brendon Todd, JT Poston11:37 AM - Adam Svensson, Matthew Fitzpatrick11:48 AM - Adam Hadwin, Byeong-Hun An11:59 AM - Sahith Theegala, Justin Rose12:10 AM - Jordan Spieth, Sung-Jae Im12:21 AM - Sepp Straka, Emiliano Grillo12:32 AM - Xander Schauffele, Adam Schenk12:43 AM - Russell Henley, Nick Taylor12:54 AM - Patrick Cantlay, Max Homa01:10 AM - Rory McIlroy, Lucas Glover01:21 AM - Brian Harman, Tommy Fleetwood01:32 AM - Hideki Matsuyama, Tom Hoge01:43 AM - Cameron Davis, Cameron Young01:54 AM - Eric Cole, Andrew Putnam02:05 PM - Lee Hodges, Seamus Power02:16 PM - Kurt Kitayama, Denny McCarthy02:27 PM - Sam Burns, Chris Kirk02:43 PM - Tyrrell Hatton, Corey Conners02:54 PM - Collin Morikawa, Jason Day03:05 PM - Si Woo Kim, Joohyung Kim03:16 PM - Tony Finau, Taylor Moore03:27 PM - Wyndham Clark, Viktor Hovland03:38 PM - Jon Rahm, Scottie Scheffler03:49 PM - Rickie Fowler, Keegan Bradley04:00 PM - Patrick Rodgers, Harris EnglishOther major news on the 2023 BMW Championship will be updated soon.