place sliced cucumbers and onion in a bowl and turn over lightly to mix. Place in a large 2 quart jar (one with a lid that seals tight).
Blend Sugar, Vinegar, Salt, Celery Seed and Dill Weed in a small bowl. Sugar will notr be completely disolved and that is okay. Pour mixture over cucumber and onion mixture in 2 quart jar, seal top and place in refrigerator. Periodically turn jar upside down to agitate mixture over cucumbers and return back to refrigerator right side up again. Ready to eat next day.