By Scott DiSavino

Sept 30 (Reuters) -U.S. natural gas futures eased about 1% on Monday on a small increase in output over the weekend and forecasts for less demand over the next two weeks than previously expected.

That small output increase came as some drillers restarted their Gulf of Mexico production now that Hurricane Helene passed through the area.

The decline in demand, meanwhile, was due in part to a reduction in the amount of gas power generators will likely burn with over two million homes and businesses still without power in the U.S. Southeast and Midwest after Helene battered the region late last week.

Front-month gas futures NGc1 for November delivery on the New York Mercantile Exchange fell 1.9 cents, or 0.7%, to $2.883 per million British thermal units at 9:02 a.m EDT (1302 GMT). On Friday the contract closed at its highest since June 18.

Despite the small decline, the front-month remained in technically overbought territory for a second day in a row for the first time since May.

For the month, the contract was up about 36%, the most in a month since July 2022.

For the quarter, the front-month was up about 11% after jumping 48% last quarter.

With gas futures up about 45% over the past five weeks, speculators boosted their net long futures and options positions on the New York Mercantile and Intercontinental Exchanges for a fourth week in a row to their highest since early July, according to the U.S. Commodity Futures Trading Commission's Commitments of Traders report.

In Canada, meanwhile, next-day gas prices at the AECO hub NG-ASH-ALB-SNL in Alberta fell to 4 cents per mmBtu, their lowest since hitting a record low of around 2 cents in August 2022, according to data from financial firm LSEG going back to 1993.

SUPPLY AND DEMAND

LSEG said gas output in the Lower 48 U.S. states fell to an average of 102.1 bcfd so far in September, down from 103.2 bcfd in August. That compares with a record 105.5 bcfd in December 2023.

The average output for September, however, was higher than seen last week as some Gulf of Mexico production returned to service.

LSEG forecast average gas demand in the Lower 48 states, including exports, will rise from 95.9 bcfd this week to 96.6 bcfd next week. Those forecasts were lower than LSEG's outlook on Friday.

Gas flows to the seven big U.S. liquefied natural gas (LNG) export plants eased to an average of 12.7 bcfd so far in September, down from 12.9 bcfd in August. That compares with a monthly record high of 14.7 bcfd in December 2023.

That reduction was due mostly to the planned Sept. 20 shutdown of Berkshire Hathaway Energy's 0.8-bcfd Cove Point LNG export plant in Maryland for around three weeks of annual maintenance.

The U.S. became the world's biggest LNG supplier in 2023, ahead of recent leaders Australia and Qatar, as much higher global prices feed demand for more exports due in part to supply disruptions and sanctions linked to Russia's invasion of Ukraine.

Gas prices were trading around a six-week high of $13 per mmBtu at the Dutch Title Transfer Facility (TTF) benchmark in Europe TRNLTTFMc1 and a one-week high of $13 at the Japan Korea Marker (JKM) benchmark in Asia JKMc1. NG/EU

Reporting by Scott DiSavino; Editing by Andrea Ricci

For gas data on the LSEG terminal type ENERGY in the search bar and then go to the GAS drop down and the NORTH AMERICA drop down.

For Interactive Map, type 'Interactive Map' in the box at upper left of the LSEG terminal

For graphics on Baker Hughes rig counts, see: http://graphics.thomsonreuters.com/15/rigcount/index.html

For next-day SNL U.S. gas prices, see: 0#SNL-NG

For next-day SNL U.S. power prices, see: 0#SNL-PWR

For U.S. natgas price and storage polls, see: NGAS/POLL

For U.S. nuclear power outages, see: NUKE/

For U.S. Northwest hydro power report, see: NWRFC

For U.S./Canada natural gas rig count vs Henry Hub futures price, see: http://tmsnrt.rs/2eT9k44

For the U.S. natural gas speed guide, see: USGAS

For the U.S. power speed guide, see: USPOWER

To determine CFTC managed money net position add (NYMEX Henry Hub options and futures combined 3023651MNET) plus (ICE Henry Hub options and futures combined 3023391MNET divided by four) plus (NYMEX Henry Hub swaps options and futures combined 303565BMNET divided by four) plus (NYMEX Henry Hub penultimate gas swaps 303565CMNET divided by four)

NYMEX Henry Hub options and futures combined 0#3CFTC023651

NYMEX Henry Hub futures only 0#1CFTC023651

ICE Henry Hub options and futures combined 0#3CFTC023391

NYMEX Henry Hub swaps options and futures combined 0#3CFTC03565B

NYMEX Henry Hub Penultimate gas swaps 0#3CFTC03565C