There were times I didn’t go to shul because of bad weather. One Shabbos the temperature was very low, it was very windy, and it was snowing heavily. It had snowed earlier in the week, and many of the streets were still icy. I didn’t walk to shul, because it was dangerous. There was once a bad storm on a Shabbos, and there were big branches falling in my neighborhood. I didn’t walk to shul for Mincha or Maariv, for fear of a falling branch.
But I never missed going to shul just because of a fear of getting wet! I’ve walked to shul in downpours, in snowstorms, and temperatures in the single and triple digits.