Daytime high temperatures are forecast to climb into the 90s this week in the North Country, and heat indexes, which figure in the effects of humidity, might be into the 100s, according to the National Weather Service.

“Hot temperatures and high humidity can have dangerous consequences, including heat-related illness and death,” said Gov. Andrew Cuomo today. “It is important to pay close attention to weather advisories and warnings, and take action now to protect yourself and your loved ones from this prolonged, excessive heat wave. I urge all New Yorkers to check on their neighbors, stay inside when possible, stay hydrated, and take advantage of cooling stations if needed.”

New York State Division of Homeland Security and Emergency Services Commissioner Jerome M. Hauer said, “Drink plenty of fluids and stay out of the sun. Stay in an air-conditioned room, if possible, such as a public building or mall. And be sure to check on your neighbors, especially the elderly and those with pre-existing health problems.”

The NWS says overnight temperatures will not go much below 70 degrees for several days, making sleep more difficult for those without air conditioning.

The daytime temperatures are expected to moderate a bit as the week goes on, perhaps not even cracking the 80-degree mark Saturday.

The NWS forecast for the St. Lawrence Valley and northwestern Adirondacks:

This Afternoon: Mostly sunny and hot, with a high near 92. Heat index values as high as 96. West wind around 10 mph.

• Tonight: Mostly clear, with a low around 69. South wind 3 to 7 mph.

• Tuesday: A chance of showers, with thunderstorms also possible after 2pm. Mostly sunny and hot, with a high near 90. Heat index values as high as 98. West wind 6 to 10 mph. Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

• Tuesday Night: Partly cloudy, with a low around 69. South wind 5 to 7 mph.

• Wednesday: A chance of showers between noon and 2pm, then a chance of showers and thunderstorms after 2pm. Mostly sunny and hot, with a high near 90. Southwest wind 7 to 16 mph. Chance of precipitation is 40%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

• Wednesday Night: A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 70. Southwest wind 9 to 14 mph becoming light after midnight. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

• Thursday: A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 87. Southwest wind around 6 mph.

• Thursday Night: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 69. Calm wind becoming southwest around 6 mph after midnight.

• Friday: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 87. Southwest wind 8 to 10 mph.

• Friday Night: A 50 percent chance of showers and thunderstorms. Cloudy, with a low around 68. Southwest wind 8 to 13 mph.

• Saturday: A chance of showers. Partly sunny, with a high near 77. Northwest wind around 8 mph. Chance of precipitation is 30%.

• Saturday Night: Partly cloudy, with a low around 59. Northwest wind around 6 mph.

• Sunday: Sunny, with a high near 77. North wind around 7 mph.