Answer:
It is raining now,but I didn't bring an umbrella with me
Explanation:
"It's raining now": The phrase indicates that the action (raining) is happening at the present moment. The present continuous tense ("is raining") is used to describe ongoing actions.
"I didn't bring an umbrella with me": This part indicates an action that was completed in the past (bringing the umbrella). Since the action of not bringing the umbrella happened before the present moment of it raining, the past simple tense ("didn't bring") is appropriate.