Your midday New Hampshire weather update Beach hazards are the big concern today as temperatures soar into the upper 80s and low 90s across New Hampshire. Those warm air temperatures are creating a dangerous contrast with ocean water that's still only in the low to mid 50s – cold enough to quickly sap your strength if you end up in the water unexpectedly. This morning starts comfortable in the 60s, but we'll see a rapid warmup through the day.