Any good tips for racing in rain? Transition tips?
Take it easy in the corners and take it easy getting in and out of transition. Stay clear of other riders in said locations. They may go down and take you out with them. Push your bike a little past the mount line if you have to. A lot of people do not train in the rain and will not know the limits of their tires.
Do you run in cleats? See how that works on wet grass or pavement before the race.
Wear a visor on the run and/or clear glasses. Rain in your eyes sucks.
That’s all I can think of.
Be prepared to spend a few hours CLEANING all your stuff after the race.
Mooseman’s weather is scattered showers; hopefully it doesn’t start to rain until the run.
Gotta be fun racing in it
Did Miami 2011 in the rain. Wrecked like a SOB on rail road tracks. Be really careful of painted lines in road, puddles, rail road tracks, sharp turns, manhole covers, etc. I also could not see at all on the bike as the warm humid air made my clear glasses totally fog up. I ended up riding with no glasses at all on the bike and run. Be careful with wet bike shoes and your feet. If they are wet the whole ride the skin will be really soft and prone to blisters on back half of bike and/or run. As for transitions, if it is going to rain the whole time, no need to protect your shoes in T1 or T2. If the rain may stop then I would keep running shoes in a big plastic bag to keep them dry. Same for bike shoes if the rain could stop after swim.
socks and shoes in a plastic bag in transition. They’ll get soaked soon enough, but I think it blows putting on wet stuff for the start of the run. Also, make sure your sunglasses aren’t the type to get fogged up; not sure how to do this other than training in the rain, but it’ll suck if you get out there and realize your glasses don’t work.
Johnson & Johnson Tearless Baby Shampoo - Put a little in your swim goggles and a little on your race lenses of your clear lenses or glasses. Works the same as foggle at a fraction of the cost.
Lower the pressure in your tires a little–about 5psi. Gives you a little more surface area to grip the road with.
I am contemplating using my road bike with clip ons rather than my tribike for an upcoming race for which rain is forecast. The rationale is that I am a more confident rider in the rain on my road bike and therefore will need to slow down less - any thoughts on whether I should just suck it up and stick with the tribike?
I would not switch bikes unless it was up and down the entire course and/or had tons (>30-40) of turns. With rain usually comes wind and a tri bike beats a road bike. I also swear by Corsa Evo tires for racing but I would not use them again on wet roads. In addition to my 50 foot slide after the tracks, I had 3-4 oh crap moments where the tires skipped/slid on the pavement. I’d spend some time searching for the best wet tires if this is an A race for you.
Beware of rubbing with wet shoes. I did a half Iron a few weeks ago in the rain without socks and rubbed a raw place above my heel. There was a lot of blood, and it still hasn’t healed. In the future I’ll probably take the extra 10 seconds to throw on socks.
If you ride with an aero helmet with a visor, take off the visor and use glasses. You can take the glasses off if needed.
As someone else mentioned, baby shampoo or Rain X on your sunglasses will help the fog and rain.
I just hope the rain won’t slow me down any!
good tips so far, but the most important one:
HTFU
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go like hell, stay off the side of the road, if possible, that’s where all the debris washes off, i would put puncture resistant tubes, for peace of mine.
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Avoid riding over any painted road surfaces and watch out when you do.
good tips so far, but the most important one:
HTFU
This ^. I actually PR’d in Miami.
Dry socks in a bag for ride, and another pair to put on before the run just in case. Body glide on any spots inside your shoes that you think might rube blisters. Have your visor in the bag as well. Maybe even a small hand towel in the bag to dry feet before putting on socks. Of course if your worried about time then just race, but little things like this and what others mentioned can go a long way.
If you’re unfamiliar with the course, avoid spots of standing water. Can’t tell if it’s a tiny 1 mm road depression or a 5 cm deep pothole.
If you have a grass/mud transition area, an extra water bottle to somewhat rinse off your feet before putting socks/running shoes on in T2. Also in general take running in and out of transition easier if muddy…
The good thing about rainy triathlons is less drafting on the bike since no one likes to sit in the spray for miles on end. 
Conti GP4000s seem to handle well in the wet. Still be careful on white lines and metal covers though.
Good luck!