Mankato Half Marathon on Saturday

Only a few days till the Mankato Half.  I've decided to run with the 1:40 pacer and push the last mile to get under 1:40.  I've been doing runs at the 7:40 pace without really trying, so I am very positive.  However, the weather forecast is rain.  I've only run once in the rain, so this could be a real challenge.  It will also be in the 40-50 degree range, add some rain and it could be very cold.