September 2027 Moon Phase Calendar

September 2027 carries one full moon — 2027's Harvest Moon, landing well ahead of where 2026's occurrence fell, and by a wider margin from the equinox this time (see our dedicated page for why the exact date shifts year to year) — and one New Moon. The autumn equinox (around September 22-23) again marks day and night reaching close to equal length worldwide.

September 2027 brings the same general early-autumn transition as most Septembers: lengthening nights, often easing summer humidity in many regions, and the shift from summer to autumn constellations getting underway. The New Moon window this month is a genuinely good one for any deep-sky observing you've been saving for darker, cooler nights than summer offered.

The equinox gives September a second thing worth marking beyond its phase dates — solunar-theory anglers cite the changeover period itself, separately from the New and Full Moon windows. Gardeners across temperate regions are into early-autumn harvesting by now, with late-season roots being the crop most often timed to the darkening half of the lunar month under traditional practice.

This year's dates, genuinely different from September 2026's occurrence, are listed above; the Harvest Moon's own page explains the equinox rule behind the name.

This full moon falls in Pisces, one of the three fruitful water signs under the older zodiac-gardening tradition — a more favorable planting classification than 2026's barren Aries Harvest Moon, showing how much the granular zodiac reading can shift year to year even for the exact same traditional full-moon name.

With this year's New Moon landing sooner in the month than it did in 2026, the Andromeda Galaxy and Great Square of Pegasus reach good evening placement slightly earlier in the September calendar this year too — worth checking the specific date above rather than assuming the same viewing window as last year's entry.

The same generally favorable September weather pattern — lower humidity, fewer storms, comfortable evenings — applies again this year across much of the temperate Northern Hemisphere, making this one of the more consistently pleasant months for stargazing regardless of which year you're checking.

This year's equinox again marks the fastest day-length change of the whole year, the same roughly two-to-three-minute-per-day shift described for September 2026 — worth watching sunset creep earlier week to week if you want to see that seasonal rate of change for yourself.

This month's cooler, clearer evenings make it one of the more reliably pleasant stretches of the year for anyone new to stargazing to try their first extended session.

This month's transition from summer to autumn constellations is worth watching over several consecutive clear nights if you can manage it, since the shift is genuinely visible week to week rather than happening all at once.

This month's milder temperatures make it a comfortable one for introducing children or beginners to an evening outside without winter's discomfort or summer's bugs.

This month's balance of comfortable temperatures and increasingly early darkness makes it one of the more convenient months on this calendar.

This month's gentle transition from summer to autumn makes it one of the year's more comfortable stretches for time outdoors.

This month rewards taking advantage of easing summer heat before autumn's colder conditions fully set in.

Its balance of comfort and clarity makes it one of the year's more reliably rewarding stretches.

A light throw blanket is often all the extra warmth this month's evenings actually require.

A simple checklist taped inside a gear bag prevents forgetting small essentials on a rushed evening.