Newark airport connection times?

I'm flying from Regan airport, Washington dc, to London Heathrow with a connection of 1 hour and 30 minutes in newark. I was wondering if this is enough time to connect and how I would recheck my bags after I collect them in newark? I have to get from terminal A to terminal C.

If you're flying on the same airline on both legs of your trip, you won't have to collect your bags at all. I think I would check with the airline(s), but they probably wouldn't try give give you a connecting flight that you could not GET to in the time allotted.

You shouldn't have to recheck your bags unless you have booked completely separate tickets for these flights. If they were on the same itinerary, with the same or partner airlines, then your bag will be automatically transferred for your flight.

That layover is shorter than I myself would like, but it will be enough time IF your first flight is on time. Your flight to London will probably start boarding 45-60 min before departure, so you really only have 30-45 min to get from one gate to the next (which also includes the time it takes your plane to get to the gate, and for you to get off your plane). They have a monorail between terminals, so you can move between them fairly fast. Don't stop at any shops or restaurants until you find your gate and make sure that you have some extra time.

If you have a layover in Newark (or elsewhere in the US) on your return, then you will have to clear Immigration and Customs before boarding your final flight. Be sure to leave extra time for that - 90 min would likely not be suficient.

From gate arrival at A, to departure gate at C, travel transfer time is 10 to 32 minutes (5AM-Midnight).
Details and explanation:
Typically, the checked bags are transferred for you if bought on a single ticket. They should be checked through to London when checking in at Reagan Airport. On the way back, if changing from International to Domestic, you need your baggage to pass through Customs. To get from A to C there's a monorail airtrain, that runs every three minutes 5AM to Midnight and every 15 minutes from Midnight to 5AM. It takes about 4 minutes to travel from A to C on the Airtrain.
At landing at Newark, the plane has to taxi from the runway to the terminal gate, typically 10 minutes but may be a little faster or slower. The scheduled time is supposed to be gate arrival. You need to exit the plane with your carryon luggage. You need to walk from the gate to terminal central area where gate 29 would be in the map.

It lets you off towards the end of C near where gate 130 would be.
There's no charge (money) to transfer between terminals. There could be up to one half mile in walking to and from the monorail train at A and C.
If gate arrival is on-time exactly, 10 minutes maximum getting off the plane, 15 minutes maximum walking at A and C, 7 minutes maximum including wait for the train. The maximum gate to gate is 32 minutes, and usually less. It is 10 to 32 minutes to get from plane gate arrival in A to the departure gate in C

If it is all on one ticket, your bags should be checked through and all you have to do is get to the gate at Newark. Even if you have to drag them to the new gate and check them there, you should have enough time.

Amazing you already know exactly when your flight from Washington will arrive to an exact minute.

You have a SCHEDULED time of just over one hour to get from one flight to the next.
IT IS POSSIBLE if all things go to plan.
You do not have time to loiter, go shopping or wander aimlessly. Things can change at the last minute for what gate you need to go to or what gate you arrive at. Check the information screens as you exit your first flight to see the CURRENT information.

In most cases your luggage will be transferred for you ASK WHEN YOU CHECK IN at Reagan for your specific combination of flights and ticket purchased.

You have little time to waste. It can be done and you are deliberately pushing the limits. A Minor delay in departing from Reagan can foul this up.
SCHEDULED TIME is not actual time YOU GET OFF PLANE.
SCHEDULED TIME is not last minute to board.
There are many many flights from Washington to NYC. You can push the limits and might make it. Do you really want to spend hours and hours waiting for next available seat? You DO NOT get a FREE NYC vacation while you wait.

It is possible. You MIGHT make it. Your first flight might arrive on time or even a few minutes early. You have very little room to compensate for any delays in the process of getting from one plane to the next.

Have you planned for what might happen if you miss your connection? Next seat might be an hour or a few days.
It is a prudent idea to allow more time and take an earlier flight to NYC.

Of course you have already predicted exactly what the weather will be as it concerns arrivals and departures on the North east coast at the hours you will be flying around.
You MIGHT MAKE IT. Some reason in particular you are aiming to be last on board and need to run from one to the next?
POSSIBLE but is really a good idea to allow some more time.

Your bags will automatically be sent to your connecting flight, so you don't have to collect them until you get to London. At Newark, you'll already be in the "secure area" (past security and near the gates) and won't have to go through security again even if the terminal is different.