May brings 20°C daytime highs, 13mm of precipitation across about 1 wet days and 10.7 hours of daylight — best for hiking, cycling and autumn colour. The strongest run of the year is May to July. January is the quietest month: quiet and local, and still good for beach days, swimming and green season.
Long-run climate normals for Johannesburg. Month ratings compare months within Johannesburg only — they are not a ranking of Johannesburg against other destinations, and they are not a forecast for a specific year.
Last updated: · Live forecast data refreshes hourly.
| Best month | May — Hiking, Cycling, Autumn colour |
| Best 3-month window | May–July |
| Quietest month | January — Quiet and local |
| Driest month | July — 4mm |
| Wettest month | January — 125mm |
| Warmest / coolest | January 26°C / August 17°C |
| Seasonality | Fairly even across the year |
| Annual rainfall | 713mm over roughly 79 rain days |
January gets roughly 862% more precipitation than May — 125mm against 13mm. That difference, more than temperature, is what changes how a day here feels.
Daytime highs only move 9°C across the whole year (17–26°C), so timing matters far less here than rainfall does.
December gives you 13.6 hours of daylight against just 10.4 in June — a 3-hour difference in how much you can actually fit into a day.
July is the driest month at 4mm across roughly 1 wet days, while January peaks at 125mm.
June is almost as good as May, but usually quieter and cheaper. If your dates are flexible, it is the easier trip.
Johannesburg stays fairly consistent all year, so there is no month you need to avoid. What you plan to do matters more than when you go.
Ratings compare months within Johannesburg, not against destinations worldwide: five stars means the best time to be here, not that Johannesburg beats anywhere else. Tags describe what the conditions actually suit.
| Month | Rating | High / Low | Precipitation | Wet days | Sun | Daylight | Best for |
|---|---|---|---|---|---|---|---|
| January | ★★☆☆☆ | 26°C / 15°C | 125mm | 14 | 7h | 13.5h | Beach days · Swimming · Green season |
| February | ★★☆☆☆ | 26°C / 15°C | 90mm | 10 | 5h | 12.9h | Beach days · Swimming · Quiet and local |
| March | ★★☆☆☆ | 25°C / 13°C | 91mm | 10 | 5h | 12.1h | Quiet and local |
| April | ★★★★☆ | 23°C / 11°C | 54mm | 6 | 4h | 11.3h | Hiking · Cycling |
| May | ★★★★★ | 20°C / 8°C | 13mm | 1 | 6h | 10.7h | Hiking · Cycling · Autumn colour |
| June | ★★★★★ | 18°C / 6°C | 9mm | 1 | 8h | 10.4h | Hiking · Cycling |
| July | ★★★★★ | 17°C / 4°C | 4mm | 1 | 8h | 10.5h | Hiking · Cycling |
| August | ★★★★★ | 17°C / 4°C | 6mm | 1 | 8h | 11.1h | Hiking · Cycling |
| September | ★★★★★ | 18°C / 6°C | 27mm | 3 | 8h | 11.9h | Hiking · Cycling · Spring greenery |
| October | ★★★☆☆ | 20°C / 8°C | 72mm | 8 | 6h | 12.7h | Hiking · Cycling · Spring greenery |
| November | ★★☆☆☆ | 23°C / 11°C | 117mm | 13 | 4h | 13.3h | Hiking · Cycling · Quiet and local |
| December | ★★☆☆☆ | 25°C / 13°C | 105mm | 12 | 5h | 13.6h | Quiet and local |
| You are planning | Pick | Why |
|---|---|---|
| Sun & beach days | June | 8h daily sunshine, 18°C highs and only 1 rain days. |
| City walking & sightseeing | May | 20°C highs with 10.7h of daylight — long days without heat fatigue. |
| Photography & light | August | 8h of sun and 11.1h daylight give the widest window for golden-hour work. |
| Value & fewer crowds | July | Scores 80/100 — close to peak conditions but outside the busiest window. |
| Cooler-weather travel | July | 17°C highs and 4°C nights suit anyone who dislikes heat. |
Each month in Johannesburg is described from long-run climate normals and then rated relative to the other eleven months in the same city. A five-star January in a cold destination means January is one of the best times to be there — not that it beats a Mediterranean summer.
| Factor | Weight | What it measures |
|---|---|---|
| Temperature | Described | Average daytime high and overnight low for the month, shown as measured rather than judged. |
| Precipitation | Described | Monthly millimetres and wet-day count, labelled as snow or rain/snow where temperatures make that the likely phase. |
| Sunshine & daylight | Described | Average daily sunshine hours and astronomical daylight length at mid-month, from the city’s latitude. |
| “Best for” tags | Derived | Applied only when the conditions genuinely support the activity — snow depth-friendly cold for skiing, 13–24°C and low rain risk for hiking, dark evenings at high latitude for aurora. A month with few strong use cases gets fewer tags rather than padded ones. |
| Star rating | Relative | Ranks the month against the other eleven months in the same city. Never a comparison between cities. |
Figures are long-run climate averages, not a forecast for a specific year. Where a month lacks sourced rainfall or humidity, the value is modelled from temperature range and rain frequency.
May is the best all-round month in Johannesburg: 20°C highs, 13mm of precipitation and 10.7 hours of daylight, which suits hiking, cycling and autumn colour. The strongest three-month window is May to July.
January — 26°C highs, 125mm of precipitation over roughly 14 days and 13.5 hours of daylight. It is the cheapest and least crowded time to go, and it still works for beach days, swimming and green season.
July is the driest month at 4mm over about 1 rain days, against 125mm in January. Across the year Johannesburg records around 713mm.
Yes — conditions in Johannesburg stay fairly even all year, so there is no month you need to avoid. What you plan to do matters more than when you go.
Daylight ranges from 10.4 hours in June to 13.6 hours in December, calculated from the city's latitude.