I have seasonal allergies and take singular daily. I've tried various inhalers which can induce me almost loosing my voice. I have a chronic dry non productive cough, mild to moderate shortness of breath, occassional chest tightness.
Yes, DB, hot, dry weather can absolutely make asthma worse, because those are the conditions that help spread pollen spores far and wide in the environment. If you are allergic to pollen, then hot, dry weather is your enemy. Stay inside as much as you can on days like that, especially in the early morning when pollen counts are often at their highest.
To your health,
I don't know where you live, but It is hot and dry where I am in Georgia, but I believe it is the air quality that is causing me the worst asthma symptoms I have had in a long time. First I went through a wet spring when everything bloomed and my allergies were an issue, but that was nothing compared to this week. Nothing is working and every time I have to go out I just get worse. I think I am going to start on Prednisone tomorrow because when it gets this bad that is the only thing that will stop it.