Arizona · Deserts & Dry Basins · hardiness zone 10a
Now
35°C · Partly cloudy
Today
41° / 30°
Rain, 7 days
127 mm
Season
Fall · frost in ~103 d
Above about 32 °C tomatoes drop their flowers and lettuce turns bitter.
Writing your field guide — reading the forecast, the moon and the map…
Overhead · Phoenix, Arizona
The two clocks nothing on the ground can argue with: the length of the day, and the phase of the moon.
The sun
12h 23m of light
Sunrise
06:11
Solar noon
12:23
Sunset
18:35
A month from now the day will be 1h 01m shorter. Enough light for steady growth.
Right now · Phoenix, Arizona
Nothing here is a guess. Each of these is read from this week's forecast and this location's climate record, and each one is pushing the season one way or the other.
36.7 °C soil · 127.2 mm
Warm and damp: the fastest decay of the year. Compost cooks, leaf mould breaks down, worms work the surface — and mushrooms fruit two to seven days after a soaking rain.
Fungi and bacteria turning last season into next season's soil. The same warm, wet window that runs a compost heap also fruits the mushrooms.
127.2 mm / 7 days
127.2 mm in a week is a lot. Expect blight pressure on tomatoes and potatoes, slugs at night, and blown-out, muddy rivers.
Sets the pace for everything: germination, fungal fruiting, slug nights, and how a river runs for the next three days.
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The moon
Waxing Crescent
11% lit · waxing · day 3 of 29.5
Planting by the moon: New to first quarter: sow leafy crops and anything harvested for its leaves — lettuce, spinach, brassicas, herbs.
Fishing: good — feeding peaks in the days either side of new and full, and around moonrise and moonset.
Turn of the season
Fall equinox
Sep 22 · 7 days away
About 103 days to the average first frost (Dec 26).
Next moons
328 frost-free days
Typically Feb 1 to Dec 26 here. Coldest night in the next week: 23.4 °C.
The hard edge of the growing season. Ice inside a leaf ruptures its cells — one night ends a tomato and sweetens a parsnip.
36.7 °C
Hot soil: germination drops off above 30 °C and roots slow. Mulch, shade the row, and sow late in the day.
Seeds read soil temperature, not the calendar. Six centimetres down is where the decision gets made.
12h 23m
Losing about 2 minutes of daylight a day.
The one thing weather can't change. Plants count photoperiod to decide when to bolt, bulb, flower and go dormant.
Waxing Crescent · 11%
Waxing, 3 days old. Full moon in 11 days. Fishing outlook: good.
It moves water — in the sea, in a lake's edge, and, by long tradition, in the sap of a plant. Fish feed hardest on the days around new and full.
Found near Phoenix · September
212 species have been recorded within about 40 km of here in September, from verified public observations. These are the ones we have written up, ordered by how often they turn up.

31 records within 40 km this month

10 records within 40 km this month

3 records within 40 km this month
Recorded near you this month. We have no identification guidance for these, so treat them as a list of things to go and learn — from a regional key or someone who knows them — not as a list of things to pick.
Fungi

Podaxis inyoensis
Podaxis inyoensis
16 records nearby

Desert Shaggymane
Podaxis pistillaris
7 records nearby

flowerpot parasol
Leucocoprinus birnbaumii
7 records nearby

lantern stinkhorn
Lysurus mokusin
2 records nearby

Ganoderma sessile
Ganoderma sessile
2 records nearby

Prickly Pear Leaf Spot
Phyllosticta concava
2 records nearby

Tomophagus colossus
Tomophagus colossus
2 records nearby

Conifer Mazegill
Gloeophyllum sepiarium
1 record nearby

onion-stalk parasol
Leucocoprinus cepistipes
1 record nearby
Amylosporus sp. 'GD118'
Amylosporus sp. 'GD118'
1 record nearby
Plants

saguaro
Carnegiea gigantea
313 records nearby

California Barrel Cactus
Ferocactus cylindraceus
121 records nearby

Creosote Bush
Larrea tridentata
104 records nearby
Photographs and records from iNaturalist, used under their open licences and credited to their photographers.
Your woods
The commonest trees recorded nearby, most often seen first. Most of the good mushrooms are tied to a particular tree, so this is the first thing to know about a wood.
Know these first
2 species on our hazard list have been recorded near here this month. Learn these before you learn anything you intend to eat.
Chlorophyllum molybdites
Amanita muscaria
These are recorded within about 40 km of here in this month, from verified public observations. It is not a complete list of what is dangerous — nothing is — and a species missing from it may still be in your woods. Never eat anything identified from a photograph and a description alone.
Next
Coming into season in the next month or two near Phoenix, Arizona. Seasons shift a week or two with the weather, so treat these as things to keep an eye on rather than dates.