Thomas Prommer
Ask AI Tom

Free tool · 82 cities · 5 years of data

Weather maxing map

Tell it what good weather means to you, and it shows where that weather is in any month, then plans a year that keeps you in it. It runs on the same five years of daily data I use to decide where to spend my own months. The idea behind it is in Weather maxing: how I chase the best weather on earth.

1. Your weather

Ideal daytime high
Humidity you accept
Rain you accept
Sun
Air quality

Scores against US AQI 50, the "good" line.

Seasons

2. Where it is best in November

Match score<40405060708090+

3. Your 12-month rotation

Starting in November. Average 85/100 with 1 move. Each move has to buy back its cost in better weather, so the plan only relocates when the gain is real.

  1. Nov85
  2. Dec84
  3. Jan78
  4. Feb83
  5. Mar91
  6. Apr91
  7. May84
  8. Jun87
  9. Jul85
  10. Aug83
  11. Sep83
  12. Oct85

4. The whole year, every city

Ranked by your average over twelve months
CityJanFebMarAprMayJunJulAugSepOctNovDecAvg
73797374808785838385827480
78839191848257526276858477
47454964718385898475585367
56587071736865748063686367
70848279665255515057717066
68757375503633547984747765
59748182715347455066736664
55778886795938383849644560
21273265779282718183532159
49444651637070767264575159
85859078451918213146839258
63736658445748535552555757
38486290805227276179763656
86794733303136404468798555
82814634323641424458758154
22232240729383808967322154
45444552545965666054434553
22222341738888888563272153
86897840222122232552808952
60515051515059535451484852

Best places by month, at a glance

The top three cities for each month with my own settings: highs of 25 to 31°C, dew point up to 19°C, nine rainy days at most, mostly clear skies, strong UV and runnable mornings. Change any of that above and the list changes with it.

Month1st2nd3rd
January Buenos Aires Argentina · 86Luang Prabang Laos · 86Perth Australia · 85
February Buenos Aires Argentina · 89Perth Australia · 85Playa del Carmen Mexico · 84
March Los Cabos Mexico · 91Perth Australia · 90Mexico City Mexico · 88
April Los Cabos Mexico · 91Marrakech Morocco · 90Mexico City Mexico · 86
May Los Cabos Mexico · 84Honolulu USA · 80Marrakech Morocco · 80
June Marbella Spain · 93Los Angeles USA · 92Valencia Spain · 91
July Lisbon Portugal · 91Faro Portugal · 88Nice France · 88
August Lisbon Portugal · 90Madeira Portugal · 89Nadi Fiji · 89
September Marbella Spain · 89Cagliari Italy · 88Malta Malta · 87
October Honolulu USA · 85Brisbane Australia · 84Los Angeles USA · 83
November Los Cabos Mexico · 85Perth Australia · 83Honolulu USA · 82
December Perth Australia · 92Buenos Aires Argentina · 89Luang Prabang Laos · 85

How the score works

Each city gets a score from 0 to 100 for each month. Temperature carries the most weight: a month inside your daytime-high range scores full marks, and one 6°C outside it scores nothing for temperature, which also pulls the overall score down. You can't make up for 8°C in January with dry skies. The other criteria are soft limits. Staying under a limit scores well, staying well under it scores a little better, and going over it drops off steadily.

  • Humidity uses dew point, not relative humidity. 80% humidity at 21°C feels fine. 55% at 38°C does not. Dew point measures the moisture you actually feel: under 16°C is comfortable, 19°C is sticky, and 22°C or more is oppressive.
  • Rain counts days with at least 1 mm. A tropical month with eighteen wet days usually still means sunny mornings and an afternoon storm, so set the limit with that in mind.
  • Sun uses mean cloud cover.
  • Tan scores the estimated noon UV index: 3 or lower counts for nothing, 8 or higher counts in full.
  • Outdoor training looks at the morning low (between 8 and 23°C is runnable), dew point, air quality and rain.
  • Seasons compares the warmest month's high with the coolest month's. A gap of 15°C or more counts as real seasons, and under 5°C counts as the same all year.
  • The rotation picks one city per month to get the highest total, with a cost for each move. "A few moves" means a move has to gain about 25 points across the months that follow to be worth it.

What the data can and can't tell you

These are 2021 to 2025 monthly averages from the ERA5 reanalysis (via Open-Meteo), on a grid of about 25 km. That is good for comparing places and months, and weaker where a coast meets mountains. The Bali cell, for example, mixes Canggu with the wetter hills behind it, so it overstates rain days on the beach. Air quality comes from the CAMS model for 2023 to 2025. UV is calculated from sun angle and cloud, so read it as a guide. An average is not a forecast either: a single October can be much wetter than the mean. For the next two weeks, check a forecast.

The 82 cities are the ones I track for my own planning, so the list leans towards places with good flights, gyms and work-friendly time zones. Cold-weather and ski destinations are thin, which is why the "Proper winter" preset mostly finds Oslo.

Questions

Where is the best weather in the world right now?

It depends on the month and on what you call good weather. Set the month and your own limits for heat, humidity and rain in the map above. With warm, dry and not-muggy settings, the southern hemisphere (Perth, Buenos Aires, Cape Town) leads from November to February, the Mediterranean and Portugal lead from June to September, and Los Cabos and Southern California fill the gaps.

Which city has the best weather all year round?

No city scores high in every month for every preference. With mild settings (highs of 21 to 27°C, low humidity), Mexico City, San Diego, Honolulu and Madeira hold the steadiest scores. With warmer settings, Honolulu and Los Cabos do. The year table in the tool ranks every city by its twelve-month average for your settings.

Why does Southeast Asia score lower than I expected?

Because of dew point. Bangkok, Singapore, Bali and Ho Chi Minh City sit at dew points of 21 to 24°C for most of the year, which most people feel as sticky or oppressive. Raise the humidity limit or set humidity to "Ignore" and they climb quickly. Their dry seasons (December to February for Bangkok and Saigon, July to September for Bali) are their best months.

Where does the data come from?

Monthly averages for 2021 to 2025 from the ERA5 reanalysis via Open-Meteo, with US AQI from the CAMS air-quality model for 2023 to 2025. Each city is one grid cell of roughly 25 km, so a coast and the hills behind it are averaged together. UV is an estimate from latitude, month and cloud cover, not a measurement.

What is weather maxing?

Choosing where you spend each month so that you live in the weather you like best, and moving when somewhere else is clearly better. The full idea, and how I run my own rotation, is in the weather maxing article.